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Sample records for bluefin tuna thunnus

  1. Atlantic Bluefin Tuna (Thunnus thynnus Biometrics and Condition.

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    Enrique Rodriguez-Marin

    Full Text Available The compiled data for this study represents the first Atlantic and Mediterranean-wide effort to pool all available biometric data for Atlantic bluefin tuna (Thunnus thynnus with the collaboration of many countries and scientific groups. Biometric relationships were based on an extensive sampling (over 140,000 fish sampled, covering most of the fishing areas for this species in the North Atlantic Ocean and Mediterranean Sea. Sensitivity analyses were carried out to evaluate the representativeness of sampling and explore the most adequate procedure to fit the weight-length relationship (WLR. The selected model for the WLRs by stock included standardized data series (common measurement types weighted by the inverse variability. There was little difference between annual stock-specific round weight-straight fork length relationships, with an overall difference of 6% in weight. The predicted weight by month was estimated as an additional component in the exponent of the weight-length function. The analyses of monthly variations of fish condition by stock, maturity state and geographic area reflect annual cycles of spawning and feeding behavior. We update and improve upon the biometric relationships for bluefin currently used by the International Commission for the Conservation of Atlantic Tunas, by incorporating substantially larger datasets than ever previously compiled, providing complete documentation of sources and employing robust statistical fitting. WLRs and other conversion factors estimated in this study differ from the ones used in previous bluefin stock assessments.

  2. Atlantic Bluefin Tuna (Thunnus thynnus) Biometrics and Condition

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    Abid, Noureddine; Addis, Piero; Alot, Enrique; Andrushchenko, Irene; Deguara, Simeon; Di Natale, Antonio; Gatt, Mark; Golet, Walter; Karakulak, Saadet; Kimoto, Ai; Macias, David; Saber, Samar; Santos, Miguel Neves; Zarrad, Rafik

    2015-01-01

    The compiled data for this study represents the first Atlantic and Mediterranean-wide effort to pool all available biometric data for Atlantic bluefin tuna (Thunnus thynnus) with the collaboration of many countries and scientific groups. Biometric relationships were based on an extensive sampling (over 140,000 fish sampled), covering most of the fishing areas for this species in the North Atlantic Ocean and Mediterranean Sea. Sensitivity analyses were carried out to evaluate the representativeness of sampling and explore the most adequate procedure to fit the weight-length relationship (WLR). The selected model for the WLRs by stock included standardized data series (common measurement types) weighted by the inverse variability. There was little difference between annual stock-specific round weight-straight fork length relationships, with an overall difference of 6% in weight. The predicted weight by month was estimated as an additional component in the exponent of the weight-length function. The analyses of monthly variations of fish condition by stock, maturity state and geographic area reflect annual cycles of spawning and feeding behavior. We update and improve upon the biometric relationships for bluefin currently used by the International Commission for the Conservation of Atlantic Tunas, by incorporating substantially larger datasets than ever previously compiled, providing complete documentation of sources and employing robust statistical fitting. WLRs and other conversion factors estimated in this study differ from the ones used in previous bluefin stock assessments. PMID:26505476

  3. Atlantic Bluefin Tuna (Thunnus thynnus) Biometrics and Condition.

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    Rodriguez-Marin, Enrique; Ortiz, Mauricio; Ortiz de Urbina, José María; Quelle, Pablo; Walter, John; Abid, Noureddine; Addis, Piero; Alot, Enrique; Andrushchenko, Irene; Deguara, Simeon; Di Natale, Antonio; Gatt, Mark; Golet, Walter; Karakulak, Saadet; Kimoto, Ai; Macias, David; Saber, Samar; Santos, Miguel Neves; Zarrad, Rafik

    2015-01-01

    The compiled data for this study represents the first Atlantic and Mediterranean-wide effort to pool all available biometric data for Atlantic bluefin tuna (Thunnus thynnus) with the collaboration of many countries and scientific groups. Biometric relationships were based on an extensive sampling (over 140,000 fish sampled), covering most of the fishing areas for this species in the North Atlantic Ocean and Mediterranean Sea. Sensitivity analyses were carried out to evaluate the representativeness of sampling and explore the most adequate procedure to fit the weight-length relationship (WLR). The selected model for the WLRs by stock included standardized data series (common measurement types) weighted by the inverse variability. There was little difference between annual stock-specific round weight-straight fork length relationships, with an overall difference of 6% in weight. The predicted weight by month was estimated as an additional component in the exponent of the weight-length function. The analyses of monthly variations of fish condition by stock, maturity state and geographic area reflect annual cycles of spawning and feeding behavior. We update and improve upon the biometric relationships for bluefin currently used by the International Commission for the Conservation of Atlantic Tunas, by incorporating substantially larger datasets than ever previously compiled, providing complete documentation of sources and employing robust statistical fitting. WLRs and other conversion factors estimated in this study differ from the ones used in previous bluefin stock assessments.

  4. Seasonal movements, aggregations and diving behavior of Atlantic bluefin tuna (Thunnus thynnus revealed with archival tags.

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    Andreas Walli

    Full Text Available Electronic tags were used to examine the seasonal movements, aggregations and diving behaviors of Atlantic bluefin tuna (Thunnus thynnus to better understand their migration ecology and oceanic habitat utilization. Implantable archival tags (n = 561 were deployed in bluefin tuna from 1996 to 2005 and 106 tags were recovered. Movement paths of the fish were reconstructed using light level and sea-surface-temperature-based geolocation estimates. To quantify habitat utilization we employed a weighted kernel estimation technique that removed the biases of deployment location and track length. Throughout the North Atlantic, high residence times (167+/-33 days were identified in four spatially confined regions on a seasonal scale. Within each region, bluefin tuna experienced distinct temperature regimes and displayed different diving behaviors. The mean diving depths within the high-use areas were significantly shallower and the dive frequency and the variance in internal temperature significantly higher than during transit movements between the high-use areas. Residence time in the more northern latitude high-use areas was significantly correlated with levels of primary productivity. The regions of aggregation are associated with areas of abundant prey and potentially represent critical foraging habitats that have seasonally abundant prey. Throughout the North Atlantic mean diving depth was significantly correlated with the depth of the thermocline, and dive behavior changed in relation to the stratification of the water column. In this study, with numerous multi-year tracks, there appear to be repeatable patterns of clear aggregation areas that potentially are changing with environmental conditions. The high concentrations of bluefin tuna in predictable locations indicate that Atlantic bluefin tuna are vulnerable to concentrated fishing efforts in the regions of foraging aggregations.

  5. Changes in the distribution of atlantic bluefin tuna (Thunnus thynnus) in the Gulf of Maine 1979-2005.

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    Golet, Walter J; Galuardi, Benjamin; Cooper, Andrew B; Lutcavage, Molly E

    2013-01-01

    The Gulf of Maine, NW Atlantic Ocean, is a productive, seasonal foraging ground for Atlantic bluefin tuna (Thunnus thynnus), but commercial landings of adult size classes were up to 40% below the allocated total allowable catch between 2004 to 2008 for the rod and reel, harpoon, and purse seine categories in the Gulf of Maine. Reduction in Atlantic bluefin tuna catches in the Gulf of Maine could represent a decline in spawning stock biomass, but given wide-ranging, complex migration patterns, and high energetic requirements, an alternative hypothesis is that their dispersal patterns shifted to regions with higher prey abundance or profitability, reducing availability to U.S. fishing fleets. This study fit generalized linear models to Atlantic bluefin tuna landings data collected from fishermen's logbooks (1979-2005) as well as the distances between bluefin tuna schools and Atlantic herring (Clupeaharengus), a primary prey species, to test alternative hypotheses for observed shifts in Atlantic bluefin tuna availability in the Gulf of Maine. For the bluefin model, landings varied by day of year, latitude and longitude. The effect of latitude differed by day of year and the effect of longitude differed by year. The distances between Atlantic bluefin tuna schools and Atlantic herring schools were significantly smaller (pBank in spring and autumn surveys respectively (p<0.01, r(2)=0.24, p<0.01, r(2)=0.42). Fishermen's logbooks contributed novel spatial and temporal information towards testing these hypotheses for the bluefin tuna fishery.

  6. Changes in the distribution of atlantic bluefin tuna (Thunnus thynnus in the Gulf of Maine 1979-2005.

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    Walter J Golet

    Full Text Available The Gulf of Maine, NW Atlantic Ocean, is a productive, seasonal foraging ground for Atlantic bluefin tuna (Thunnus thynnus, but commercial landings of adult size classes were up to 40% below the allocated total allowable catch between 2004 to 2008 for the rod and reel, harpoon, and purse seine categories in the Gulf of Maine. Reduction in Atlantic bluefin tuna catches in the Gulf of Maine could represent a decline in spawning stock biomass, but given wide-ranging, complex migration patterns, and high energetic requirements, an alternative hypothesis is that their dispersal patterns shifted to regions with higher prey abundance or profitability, reducing availability to U.S. fishing fleets. This study fit generalized linear models to Atlantic bluefin tuna landings data collected from fishermen's logbooks (1979-2005 as well as the distances between bluefin tuna schools and Atlantic herring (Clupeaharengus, a primary prey species, to test alternative hypotheses for observed shifts in Atlantic bluefin tuna availability in the Gulf of Maine. For the bluefin model, landings varied by day of year, latitude and longitude. The effect of latitude differed by day of year and the effect of longitude differed by year. The distances between Atlantic bluefin tuna schools and Atlantic herring schools were significantly smaller (p<0.05 than would be expected from a randomly distributed population. A time series of average bluefin tuna school positions was positively correlated with the average number of herring captured per tow on Georges Bank in spring and autumn surveys respectively (p<0.01, r(2=0.24, p<0.01, r(2=0.42. Fishermen's logbooks contributed novel spatial and temporal information towards testing these hypotheses for the bluefin tuna fishery.

  7. Electronic tagging of Atlantic bluefin tuna (Thunnus thynnus, L. reveals habitat use and behaviors in the Mediterranean Sea.

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    Pablo Cermeño

    Full Text Available We analyzed the movements of Atlantic tuna (Thunnus thynnus L. in the Mediterranean Sea using data from 2 archival tags and 37 pop-up satellite archival tags (PAT. Bluefin tuna ranging in size from 12 to 248 kg were tagged on board recreational boats in the western Mediterranean and the Adriatic Sea between May and September during two different periods (2000 to 2001 and 2008 to 2012. Although tuna migrations between the Mediterranean Sea and the Atlantic Ocean have been well reported, our results indicate that part of the bluefin tuna population remains in the Mediterranean basin for much of the year, revealing a more complex population structure. In this study we demonstrate links between the western Mediterranean, the Adriatic and the Gulf of Sidra (Libya using over 4336 recorded days of location and behavior data from tagged bluefin tuna with a maximum track length of 394 days. We described the oceanographic preferences and horizontal behaviors during the spawning season for 4 adult bluefin tuna. We also analyzed the time series data that reveals the vertical behavior of one pop-up satellite tag recovered, which was attached to a 43.9 kg tuna. This fish displayed a unique diving pattern within 16 days of the spawning season, suggesting a use of the thermocline as a thermoregulatory mechanism compatible with spawning. The results obtained hereby confirm that the Mediterranean is clearly an important habitat for this species, not only as spawning ground, but also as an overwintering foraging ground.

  8. Mercury in Pacific bluefin tuna (Thunnus orientalis):bioaccumulation and trans-Pacific Ocean migration

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    Colman, John A.; Nogueira, Jacob I.; Pancorbo, Oscar C.; Batdorf, Carol A.; Block, Barbara A.

    2015-01-01

    Pacific bluefin tuna (Thunnus orientalis) have the largest home range of any tuna species and are well known for the capacity to make transoceanic migrations. We report the measurement of mercury (Hg) concentrations in wild Pacific bluefin tuna (PBFT), the first reported with known size-of-fish and capture location. The results indicate juvenile PBFT that are recently arrived in the California Current from the western Pacific Ocean have significantly higher Hg concentrations in white muscle (0.51 ug/g wet mass, wm) than PBFT of longer California Current residency (0.41 ug/g wm). These new arrivals are also higher in Hg concentration than PBFT in farm pens (0.43 ug/g wm) that were captured on arrival in the California Current and raised in pens on locally derived feed. Analysis by direct Hg analyzer and attention to Hg by tissue type and location on the fish allowed precise comparisons of mercury among wild and captive fish populations. Analysis of migration and nearshore residency, determined through extensive archival tagging, bioaccumulation models, trophic investigations, and potential coastal sources of methylmercury, indicates Hg bioaccumulation is likely greater for PBFT juvenile habitats in the western Pacific Ocean (East China Sea, Yellow Sea) than in the eastern Pacific Ocean (California Current). Differential bioaccumulation may be a trophic effect or reflect methylmercury availability, with potential sources for coastal China (large hypoxic continental shelf receiving discharge of three large rivers, and island-arc volcanism) different from those for coastal Baja California (small continental shelf, no large rivers, spreading-center volcanism).

  9. Muscular system in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae).

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    Nakae, Masanori; Sasaki, Kunio; Shinohara, Gento; Okada, Tokihiko; Matsuura, Keiichi

    2014-02-01

    The muscular system in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the muscular system are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species.

  10. Preliminary approach on early post mortem stress and quality indexes changes in large size bluefin tuna (Thunnus thynnus

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    R. Ugolini

    2010-01-01

    Full Text Available Bluefin tuna (Thunnus thynnus is very appreciated on Japan and USA market for the preparation of sushi and sahimi. The market price of the fresh product can vary from 8 to 33 Euro/kg (gate farm/producers prices according to size, shape, fat level, meat colour, consistency and freshness (absence of “hyake”, all parameters strictly connected to feeding quality and quantity, rearing and killing stress factors and refrigeration times and conditions after death. Excessive levels of stress during the slaughtering can affect meat quality, contributing to significantly decrease of tuna’s price. The present trial was carried out to evaluate the possible harvesting/slaughtering stress effect on reared bluefin tuna meat quality, starting from the examination of the most important stress and quality parameters changes during the early post mortem period.

  11. Amino acid isotope incorporation and enrichment factors in Pacific bluefin tuna, Thunnus orientalis.

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    Christina J Bradley

    Full Text Available Compound specific isotopic analysis (CSIA of amino acids has received increasing attention in ecological studies in recent years due to its ability to evaluate trophic positions and elucidate baseline nutrient sources. However, the incorporation rates of individual amino acids into protein and specific trophic discrimination factors (TDFs are largely unknown, limiting the application of CSIA to trophic studies. We determined nitrogen turnover rates of individual amino acids from a long-term (up to 1054 days laboratory experiment using captive Pacific bluefin tuna, Thunnus orientalis (PBFT, a large endothermic pelagic fish fed a controlled diet. Small PBFT (white muscle δ(15N∼11.5‰ were collected in San Diego, CA and transported to the Tuna Research and Conservation Center (TRCC where they were fed a controlled diet with high δ(15N values relative to PBFT white muscle (diet δ(15N∼13.9‰. Half-lives of trophic and source amino acids ranged from 28.6 to 305.4 days and 67.5 to 136.2 days, respectively. The TDF for the weighted mean values of amino acids was 3.0 ‰, ranging from 2.2 to 15.8 ‰ for individual combinations of 6 trophic and 5 source amino acids. Changes in the δ(15N values of amino acids across trophic levels are the underlying drivers of the trophic (15N enrichment. Nearly all amino acid δ(15N values in this experiment changed exponentially and could be described by a single compartment model. Significant differences in the rate of (15N incorporation were found for source and trophic amino acids both within and between these groups. Varying half-lives of individual amino acids can be applied to migratory organisms as isotopic clocks, determining the length of time an individual has spent in a new environment. These results greatly enhance the ability to interpret compound specific isotope analyses in trophic studies.

  12. Discovery of a spawning ground reveals diverse migration strategies in Atlantic bluefin tuna (Thunnus thynnus).

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    Richardson, David E; Marancik, Katrin E; Guyon, Jeffrey R; Lutcavage, Molly E; Galuardi, Benjamin; Lam, Chi Hin; Walsh, Harvey J; Wildes, Sharon; Yates, Douglas A; Hare, Jonathan A

    2016-03-22

    Atlantic bluefin tuna are a symbol of both the conflict between preservationist and utilitarian views of top ocean predators, and the struggle to reach international consensus on the management of migratory species. Currently, Atlantic bluefin tuna are managed as an early-maturing eastern stock, which spawns in the Mediterranean Sea, and a late-maturing western stock, which spawns in the Gulf of Mexico. However, electronic tagging studies show that many bluefin tuna, assumed to be of a mature size, do not visit either spawning ground during the spawning season. Whether these fish are spawning in an alternate location, skip-spawning, or not spawning until an older age affects how vulnerable this species is to anthropogenic stressors including exploitation. We use larval collections to demonstrate a bluefin tuna spawning ground in the Slope Sea, between the Gulf Stream and northeast United States continental shelf. We contend that western Atlantic bluefin tuna have a differential spawning migration, with larger individuals spawning in the Gulf of Mexico, and smaller individuals spawning in the Slope Sea. The current life history model, which assumes only Gulf of Mexico spawning, overestimates age at maturity for the western stock. Furthermore, individual tuna occupy both the Slope Sea and Mediterranean Sea in separate years, contrary to the prevailing view that individuals exhibit complete spawning-site fidelity. Overall, this complexity of spawning migrations questions whether there is complete independence in the dynamics of eastern and western Atlantic bluefin tuna and leads to lower estimates of the vulnerability of this species to exploitation and other anthropogenic stressors.

  13. Detection rate of diarrhoea-causing Kudoa hexapunctata in Pacific bluefin tuna Thunnus orientalis from Japanese waters.

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    Suzuki, Jun; Murata, Rie; Yokoyama, Hiroshi; Sadamasu, Kenji; Kai, Akemi

    2015-02-01

    Diffuse outbreaks of food poisoning with unknown aetiologies leading to diarrhoea and vomiting within a short time after ingesting flatfish (Paralichthys olivaceus), tuna (Thunnus spp.), or amberjack (Seriola dumerili) have occurred nationwide in Japan, including the Tokyo metropolitan area. In this study, we surveyed the detection rates of kudoid parasites in 12 tuna samples that caused clinical diarrhoea from 2009 to 2012; we assessed 104 samples of whole juvenile Pacific bluefin tuna (PBT, Thunnus orientalis) and 153 block samples of other tuna distributed in the Tokyo Metropolitan Central Wholesale Market. The survey revealed that more than 70% of clinical diarrhoea cases due to tuna ingestion occurred between June and September, and Kudoa hexapunctata were detected in 9 of 12 tuna samples associated with clinical diarrhoea cases. The numbers of spores and 18S ribosomal DNA (rDNA) copies per gram of fish in 8 of 9 samples were more than 1×10(6) spores and 1×10(9) copies, respectively. Market research revealed that the K. hexapunctata-positive rate in juvenile PBT from Japanese waters was 64.4% (67/104) but that in adult PBT was 10.4% (7/67). The numbers of K. hexapunctata 18S rDNA copies in 64.5% (20/31) samples and 72.7% (16/22) of <5kg fish samples collected between May and July were more than 1×10(9)copies/g. On the other hand, kudoid parasites were not detected from 73 tuna samples except for a single sample of Thunnus albacares. Cell monolayer permeability assays performed to examine the toxicity of K. hexapunctata against Caco-2 cells revealed that the transepithelial electrical resistance (TER) in 5×10(7)K. hexapunctata spores decreased by 80% within 2-4h. In conclusion, K. hexapunctata was commonly detected in juvenile PBT from Japanese waters and are a likely cause of the diarrhoea outbreaks.

  14. Quantifying mercury isotope dynamics in captive Pacific bluefin tuna (Thunnus orientalis

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    Sae Yun Kwon

    2016-02-01

    Full Text Available Abstract Analyses of mercury (Hg isotope ratios in fish tissues are used increasingly to infer sources and biogeochemical processes of Hg in natural aquatic ecosystems. Controlled experiments that can couple internal Hg isotope behavior with traditional isotope tracers (δ13C, δ15N can improve the applicability of Hg isotopes as natural ecological tracers. In this study, we investigated changes in Hg isotope ratios (δ202Hg, Δ199Hg during bioaccumulation of natural diets in the pelagic Pacific bluefin tuna (Thunnus orientalis; PBFT. Juvenile PBFT were fed a mixture of natural prey and a dietary supplement (60% Loligo opalescens, 31% Sardinops sagax, 9% gel supplement in captivity for 2914 days, and white muscle tissues were analyzed for Hg isotope ratios and compared to time in captivity and internal turnover of δ13C and δ15N. PBFT muscle tissues equilibrated to Hg isotope ratios of the dietary mixture within ∼700 days, after which we observed a cessation in further shifts in Δ199Hg, and small but significant negative δ202Hg shifts from the dietary mixture. The internal behavior of Δ199Hg is consistent with previous fish studies, which showed an absence of Δ199Hg fractionation during Hg bioaccumulation. The negative δ202Hg shifts can be attributed to either preferential excretion of Hg with higher δ202Hg values or individual variability in captive PBFT feeding preferences and/or consumption rates. The overall internal behavior of Hg isotopes is similar to that described for δ13C and δ15N, though observed Hg turnover was slower compared to carbon and nitrogen. This improved understanding of internal dynamics of Hg isotopes in relation to δ13C and δ15N enhances the applicability of Hg isotope ratios in fish tissues for tracing Hg sources in natural ecosystems.

  15. Tissue turnover rates and isotopic trophic discrimination factors in the endothermic teleost, pacific bluefin tuna (Thunnus orientalis.

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    Daniel J Madigan

    Full Text Available Stable isotope analysis (SIA of highly migratory marine pelagic animals can improve understanding of their migratory patterns and trophic ecology. However, accurate interpretation of isotopic analyses relies on knowledge of isotope turnover rates and tissue-diet isotope discrimination factors. Laboratory-derived turnover rates and discrimination factors have been difficult to obtain due to the challenges of maintaining these species in captivity. We conducted a study to determine tissue- (white muscle and liver and isotope- (nitrogen and carbon specific turnover rates and trophic discrimination factors (TDFs using archived tissues from captive Pacific bluefin tuna (PBFT, Thunnus orientalis, 1-2914 days after a diet shift in captivity. Half-life values for (15N turnover in white muscle and liver were 167 and 86 days, and for (13C were 255 and 162 days, respectively. TDFs for white muscle and liver were 1.9 and 1.1‰ for δ(15N and 1.8 and 1.2‰ for δ(13C, respectively. Our results demonstrate that turnover of (15N and (13C in bluefin tuna tissues is well described by a single compartment first-order kinetics model. We report variability in turnover rates between tissue types and their isotope dynamics, and hypothesize that metabolic processes play a large role in turnover of nitrogen and carbon in PBFT white muscle and liver tissues. (15N in white muscle tissue showed the most predictable change with diet over time, suggesting that white muscle δ(15N data may provide the most reliable inferences for diet and migration studies using stable isotopes in wild fish. These results allow more accurate interpretation of field data and dramatically improve our ability to use stable isotope data from wild tunas to better understand their migration patterns and trophic ecology.

  16. Brain morphology and immunohistochemical localization of the gonadotropin-releasing hormone in the bluefin tuna, Thunnus thynnus

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    G Palmieri

    2009-08-01

    Full Text Available The present study was focused on the morphology of the diencephalic nuclei (likely involved in reproductive functions as well as on the distribution of GnRH (gonadotropin-releasing hormone in the rhinencephalon, telencephalon and the diencephalon of the brain of bluefin tuna (Thunnus thynnus by means of immunohistochemistry. Bluefin tuna has an encephalization quotient (QE similar to that of other large pelagic fish. Its brain exhibits well-developed optic tecta and corpus cerebelli. The diencephalic neuron cell bodies involved in reproductive functions are grouped in two main nuclei: the nucleus preopticus-periventricularis and the nucleus lateralis tuberis. The nucleus preopticus-periventricularis consists of the nucleus periventricularis and the nucleus preopticus consisting of a few sparse multipolar neurons in the rostral part and numerous cells closely packed and arranged in several layers in its aboral part. The nucleus lateralis tuberis is located in the ventral-lateral area of the diencephalon and is made up of a number of large multipolar neurones. Four different polyclonal primary antibodies against salmon (sGnRH, chicken (cGnRH-II (cGnRH-II 675, cGnRH-II 6 and sea bream (sbGnRH were employed in the immunohistochemical experiments. No immunoreactive structures were found with anti sbGnRH serum. sGnRH and cGnRH-II antisera revealed immunoreactivity in the perikarya of the olfactory bulbs, preopticus-periventricular nucleus, oculomotor nucleus and midbrain tegmentum. The nucleus lateralis tuberis showed immunostaining only with anti-sGnRH serum. Nerve fibres immunoreactive to cGnRH and sGnRH sera were found in the olfactory bulbs, olfactory nerve and neurohypophysis. The significance of the distribution of the GnRHimmunoreactive neuronal structures is discussed.

  17. Burst feeding of Pelagia noctiluca ephyrae on Atlantic bluefin tuna (Thunnus thynnus eggs.

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    Ana Gordoa

    Full Text Available This study investigates the predation of P. noctiluca ephyrae on Atlantic Bluefin tuna (ABFT eggs under different experimental conditions. The specific factors considered in the experimental design were: a water mix conditions to explore predation under two-dimensional (2D and three-dimensional (3D prey distributions, b prey density to investigate the ingestion rate capacity, and c incubation time to inspect gut saturation. The eggs and jellyfish ephyrae were collected during the 2012 ABFT spawning survey off Ibiza (Balearic Isl., Western Mediterranean. The results showed that the proportion of feeding ephyrae increased with size. The mean clearance rate of feeding ephyrae, 4.14 L h(-1, was the highest ever recorded for ephyrae. Under calm conditions the eggs floated at the surface (2D spatial arrangement and the clearance rates, at low prey densities, were at least twice those under mixed conditions (3D spatial arrangement. At high prey density, clearance rate did not differ between mix conditions, probably due to the fast gut saturation, which was reached in c.a. 15 min, as revealed by time series observations of gut contents. The fast saturation of ephyrae and their slow digestion time of approximately 18 h suggest the existence of a diel feeding periodicity. We conclude that in the Western Mediterranean, P. noctiluca ephyrae are capable of predating on ABFT eggs, a highly pulsed and spatially restricted resource that potentially switches from a 3D to a 2D configuration in the absence of wind-generated turbulence. The P. noctiluca and Atlantic Bluefin tuna egg system might represent an example of a general mechanism linking pelagic and neustonic food webs.

  18. Geographical approaches the bluefin Tuna (thunnus thynnus farmers and farm of Musellim passage

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    Rüştü Ilgar

    2006-08-01

    Full Text Available The study area is important strait of our country and Lesvos Island between on the where the Biga Peninsula and Lesvos Island approach. Greenpeace, Southeast ANSE (Asociacion de Naturalistas del Sureste, WWF (World Wildlife Fund. As a result of these attempts, on April 15-19, 2002 ICCAT (International Commission for the Conservation of Atlantic Tuna and GFCM (Genaral Fisheries Commission for the Mediterranean gathered in Malta and studied on fish stocks and statistic values. At last, on April 29, 2002 they published a moratorium aimed at European Community Ministries in Cartagena. The objective of this work is to tourism process affecting life and safety aquatic biosphere, which the intensive interactions take places and discusses optimization proposals for Thunnus thynnus farmers.

  19. Morphological, nutritional and safety traits of bluefin tuna (Thunnus thynnus reared in floating cages

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    B. M. Poli

    2010-04-01

    Full Text Available To evaluate the influence of fattening on morphological, nutritional and safety characteristics, two lots of bluefin tuna were sampled before (November: 2 C, 4 ? and after 5 months of fattening (April: 5 C, 5 ?. The specimens, after death, were refrigerated and analysed at different times over the period of a week for morphological and flesh physico-chemical parameters in six muscle sites. Tuna sampled in April had greater body weight (44.04 vs 36.41kg, trunk length (52.21 vs 48.22cm and minimum and maximum circumferences (13.74 vs 12.77 and 94.90 vs 89.10cm. No differences in other linear measures or body components were found. Fattening did not influence flesh colour or total lipid content, producing small differences in its chemical composition: greater C18:0, C18:1n9 and PUFAn6 percentages; higher putrescine and histamine (0.489 vs 0.335 and 0.666 vs 0.370mg/kg but lower spermine and spermidine (10.598 vs 17.387 and 2.420 vs 3.928mg/kg levels. Large differences in physico-chemical parameters were found between muscle sites and a significant interaction between sampling date and muscle site indicated non homogeneous changes in chemical composition of dorsal, ventral and red muscle after fattening. Sex only influenced fat content in viscera (C 12.84 vs ? 9.84%.

  20. Metazoan gill parasites of the Atlantic bluefin tuna Thunnus thynnus (Linnaeus) (Osteichthyes: Scombridae) from the Mediterranean and their possible use as biological tags.

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    Culurgioni, Jacopo; Mele, Salvatore; Merella, Paolo; Addis, Piero; Figus, Vincenza; Cau, Angelo; Karakulak, Firdes Saadet; Garippa, Giovanni

    2014-04-01

    The gills of 63 specimens of the Atlantic bluefin tuna Thunnus thynnus (Linnaeus) (Osteichthyes: Scombridae) from three localities of the Mediterranean (Sardinian, Tyrrhenian and Levantine Seas) were examined for metazoan parasites. The parasite fauna of T. thynnus from the Sea of Sardinia included 11 species: five didymozoid trematodes, three capsalid and one hexostomid monogeneans, and one caligid and one pseudocycnid copepods. Four didymozoids were found in fish from the Levantine Sea and only one didymozoid was recorded in fish from the Tyrrhenian Sea. Dividing the hosts into four size-groups (small, medium-sized, large and extra large), the pairwise comparison of prevalence and mean abundance of the new and literary data) showed differences according to host size. The differences in the composition of the parasitic faunas and in the prevalence of parasites, observed between the small tunas from the Tyrrhenian Sea and the medium-sized tunas from the Adriatic Sea, Levantine Sea and the North-East (NE) Atlantic Ocean, indicated that these groups form discrete units. The parasite fauna of the large tunas from the Sea of Sardinia is the richest among the bluefin tuna populations of the Mediterranean and the NE Atlantic, due to the presence of species not found elsewhere in bluefin tunas, such as Caligus coryphaenae Steenstrup et Lütken, 1861, Capsala magronum (Ishii, 1936) and C. paucispinosa (Mamaev, 1968). This fact and the prevalence of some parasites of this group (lower than those of medium-sized fish from the NE Atlantic and higher than the small and medium-sized tunas from the Mediterranean) suggest that the large-sized tuna group in the western Mediterranean is formed by Mediterranean resident tunas (poorly infected), and by tunas migrating from the Atlantic Ocean (heavily infected).

  1. A standardised abundance index from commercial spotting data of southern bluefin tuna (Thunnus maccoyii: random effects to the rescue.

    Directory of Open Access Journals (Sweden)

    Marinelle Basson

    Full Text Available Commercial aerial spotting of surface schools of juvenile southern bluefin tuna (SBT, Thunnus maccoyii, is conducted as part of fishing operations in the Great Australian Bight in summer. This provides the opportunity to efficiently collect large amounts of data on sightings of SBT. The data can potentially be used to construct a time-series index of relative abundance by standardising the data for issues such as weather, spotter ability and ocean conditions. Unlike a statistically designed survey, the commercial spotting is governed by business considerations and fishing operations. The SBT dataset is therefore highly unbalanced with regard to spotters operating in each season. This complicates the standardisation of the data, particularly with regard to interactions between covariates. We show how a generalized additive model with random effects can simplify both the fitting of the model and the construction of an index, while also avoiding the need to leave out strata or interaction terms that are important. The approach is applicable to standardisation of more traditional catch and effort data.

  2. Demographic structure, sex ratio and growth rates of southern bluefin tuna (Thunnus maccoyii) on the spawning ground.

    Science.gov (United States)

    Farley, Jessica H; Eveson, J Paige; Davis, Tim L O; Andamari, Retno; Proctor, Craig H; Nugraha, Budi; Davies, Campbell R

    2014-01-01

    The demographics of the southern bluefin tuna (SBT) Thunnus maccoyii spawning stock were examined through a large-scale monitoring program of the Indonesian longline catch on the spawning ground between 1995 and 2012. The size and age structure of the spawning population has undergone significant changes since monitoring began. There has been a reduction in the relative abundance of larger/older SBT in the catch since the early 2000s, and a corresponding decrease in mean length and age, but there was no evidence of a significant truncation of the age distribution. Pulses of young SBT appear in the catches in the early- and mid-2000s and may be the first evidence of increased recruitment into the spawning stock since 1995. Fish in these two recruitment pulses were spawned around 1991 and 1997. Size-related variations in sex ratio were also observed with female bias for fish less than 170 cm FL and male bias for fish greater than 170 cm FL. This trend of increasing proportion of males with size above 170 cm FL is likely to be related to sexual dimorphism in growth rates as male length-at-age is greater than that for females after age 10 years. Mean length-at-age of fish aged 8-10 years was greater for both males and females on the spawning ground than off the spawning ground, suggesting that size may be the dominant factor determining timing of maturation in SBT. In addition to these direct results, the data and samples from this program have been central to the assessment and management of this internationally harvested stock.

  3. Modelling retention and dispersion mechanisms of bluefin tuna eggs and larvae in the Northwest Mediterranean Sea

    DEFF Research Database (Denmark)

    Mariani, Patrizio; MacKenzie, Brian; Iudicone, D.;

    2010-01-01

    Knowledge of early life history of most fish species in the Mediterranean Sea is sparse and processes affecting their recruitment are poorly understood. This is particularly true for bluefin tuna, Thunnus thynnus, even though this species is one of the world's most valued fish species. Here we...... mesoscale processes in the Balearic area and thus potentially affect bluefin tuna larvae. These modelling approaches can increase understanding of bluefin tuna recruitment processes and eventually contribute to management of bluefin tuna fisheries....

  4. Dispersal routes and habitat utilization of juvenile Atlantic bluefin tuna, Thunnus thynnus, tracked with mini PSAT and archival tags.

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    Benjamin Galuardi

    Full Text Available Between 2005 and 2009, we deployed 58 miniature pop-up satellite archival tags (PSAT and 132 implanted archival tags on juvenile Atlantic bluefin tuna (age 2-5 in the northwest Atlantic Ocean. Data returned from these efforts (n = 26 PSATs, 1 archival tag revealed their dispersal routes, horizontal and vertical movements and habitat utilization. All of the tagged bluefin tuna remained in the northwest Atlantic for the duration observed, and in summer months exhibited core-use of coastal seas extending from Maryland to Cape Cod, MA, (USA out to the shelf break. Their winter distributions were more spatially disaggregated, ranging south to the South Atlantic Bight, northern Bahamas and Gulf Stream. Vertical habitat patterns showed that juvenile bluefin tuna mainly occupied shallow depths (mean= 5-12 m, sd = 15-23.7 m and relatively warm water masses in summer (mean= 17.9-20.9°C, sd= 4.2-2.6°C and had deeper and more variable depth patterns in winter (mean= 41-58 m, sd= 48.9-62.2 m. Our tagging results reveal annual dispersal patterns, behavior and oceanographic associations of juvenile Atlantic bluefin tuna that were only surmised in earlier studies. Fishery independent profiling from electronic tagging also provide spatially and temporally explicit information for evaluating dispersals rates, population structure and fisheries catch patterns.

  5. Molecular Identification of Atlantic Bluefin Tuna (Thunnus thynnus, Scombridae Larvae and Development of a DNA Character-Based Identification Key for Mediterranean Scombrids.

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    Gregory Neils Puncher

    Full Text Available The Atlantic bluefin tuna, Thunnus thynnus, is a commercially important species that has been severely over-exploited in the recent past. Although the eastern Atlantic and Mediterranean stock is now showing signs of recovery, its current status remains very uncertain and as a consequence their recovery is dependent upon severe management informed by rigorous scientific research. Monitoring of early life history stages can inform decision makers about the health of the species based upon recruitment and survival rates. Misidentification of fish larvae and eggs can lead to inaccurate estimates of stock biomass and productivity which can trigger demands for increased quotas and unsound management conclusions. Herein we used a molecular approach employing mitochondrial and nuclear genes (CO1 and ITS1, respectively to identify larvae (n = 188 collected from three spawning areas in the Mediterranean Sea by different institutions working with a regional fisheries management organization. Several techniques were used to analyze the genetic sequences (sequence alignments using search algorithms, neighbour joining trees, and a genetic character-based identification key and an extensive comparison of the results is presented. During this process various inaccuracies in related publications and online databases were uncovered. Our results reveal important differences in the accuracy of the taxonomic identifications carried out by different ichthyoplanktologists following morphology-based methods. While less than half of larvae provided were bluefin tuna, other dominant taxa were bullet tuna (Auxis rochei, albacore (Thunnus alalunga and little tunny (Euthynnus alletteratus. We advocate an expansion of expertise for a new generation of morphology-based taxonomists, increased dialogue between morphology-based and molecular taxonomists and increased scrutiny of public sequence databases.

  6. Dietary evidence of mesopelagic and pelagic foraging by Atlantic bluefin tuna (Thunnus thynnus L.) during autumn migrations to the Iceland Basin

    DEFF Research Database (Denmark)

    Olafsdottir, Droplaug; MacKenzie, Brian; Chosson-P, Valérie;

    2016-01-01

    Atlantic bluefin tuna (ABFT; Thunnus thynnus) is a large highly mobile predator fish species in the North Atlantic Ocean and Mediterranean Sea. Knowledge of its trophic role in marine food webs in summer feeding areas is presently based on recent (1980–2010s) sampling in the Bay of Biscay, Gulfs...... of Maine and St. Lawrence, and from historical (1950–1960s) sampling in the Norwegian-North Sea-Kattegat. No study has yet investigated the diets of ABFT in Icelandic waters, where it supported an experimental fishery during 1996–2005, nor in any region north of the Bay of Biscay since the 1960s. However......, north Atlantic temperatures and fish species distributions, including some ABFT prey species (e.g., mackerel) have been changing in the 2000s. New knowledge of ABFT diets in previously understudied parts of the species range will be useful for understanding factors affecting the trophic role, migration...

  7. A full lifecycle bioenergetic model for bluefin tuna.

    OpenAIRE

    Marko Jusup; Tin Klanjscek; Hiroyuki Matsuda; Kooijman, S.A.L.M.

    2011-01-01

    We formulated a full lifecycle bioenergetic model for bluefin tuna relying on the principles of Dynamic Energy Budget theory. Traditional bioenergetic models in fish research deduce energy input and utilization from observed growth and reproduction. In contrast, our model predicts growth and reproduction from food availability and temperature in the environment. We calibrated the model to emulate physiological characteristics of Pacific bluefin tuna (Thunnus orientalis, hereafter PBT), a spec...

  8. On Making Statistical Inferences Regarding the Relationship between Spawners and Recruits and the Irresolute Case of Western Atlantic Bluefin Tuna (Thunnus thynnus.

    Directory of Open Access Journals (Sweden)

    Clay E Porch

    Full Text Available Forecasts of the future abundance of western Atlantic bluefin tuna (Thunnus thynnus have, for nearly two decades, been based on two competing views of future recruitment potential: (1 a "low" recruitment scenario based on hockey-stick (two-line curve where the expected level of recruitment is set equal to the geometric mean of the recruitment estimates for the years after a supposed regime-shift in 1975, and (2 a "high" recruitment scenario based on a Beverton-Holt curve fit to the time series of spawner-recruit pairs beginning in 1970. Several investigators inferred the relative plausibility of these two scenarios based on measures of their ability to fit estimates of spawning biomass and recruitment derived from stock assessment outputs. Typically, these comparisons have assumed the assessment estimates of spawning biomass are known without error. It is shown here that ignoring error in the spawning biomass estimates can predispose model-choice approaches to favor the regime-shift hypothesis over the Beverton-Holt curve with higher recruitment potential. When the variance of the observation error approaches that which is typically estimated for assessment outputs, the same model-choice approaches tend to favor the single Beverton-Holt curve. For this and other reasons, it is argued that standard model-choice approaches are insufficient to make the case for a regime shift in the recruitment dynamics of western Atlantic bluefin tuna. A more fruitful course of action may be to move away from the current high/low recruitment dichotomy and focus instead on adopting biological reference points and management procedures that are robust to these and other sources of uncertainty.

  9. Evolutionary changes of multiple visual pigment genes in the complete genome of Pacific bluefin tuna

    OpenAIRE

    Nakamura, Yoji; Mori, Kazuki; Saitoh, Kenji; Oshima, Kenshiro; Mekuchi, Miyuki; Sugaya, Takuma; Shigenobu, Yuya; Ojima, Nobuhiko; Muta, Shigeru; Fujiwara, Atushi; Yasuike, Motoshige; Oohara, Ichiro; Hirakawa, Hideki; Chowdhury, Vishwajit Sur; Kobayashi, Takanori

    2013-01-01

    Tunas are migratory fishes in offshore habitats and top predators with unique features. Despite their ecological importance and high market values, the open-ocean lifestyle of tuna, in which effective sensing systems such as color vision are required for capture of prey, has been poorly understood. To elucidate the genetic and evolutionary basis of optic adaptation of tuna, we determined the genome sequence of the Pacific bluefin tuna (Thunnus orientalis), using next-generation sequencing tec...

  10. Distribution of persistent organic pollutants (POPS) IN wild Bluefin tuna (Thunnus thynnus) from different FAO capture zones.

    Science.gov (United States)

    Chiesa, L M; Labella, G F; Panseri, S; Pavlovic, R; Bonacci, S; Arioli, F

    2016-06-01

    Residues of environmental contaminants in food represent a concern in food safety programs. In this study, the distribution of persistent organic pollutants (POPs) were evaluated in 79 tuna samples from FAO areas 51 (Indian Ocean), 71 (Pacific Ocean), 34 (Atlantic Ocean), and 37 (Mediterranean Sea). 6 polychlorinated biphenyls (PCBs), 16 organochlorines (OCs) and 7 polybrominated biphenyl ethers (PBDEs) were selected as representative compounds according to EFSA POPs monitoring guidelines. An analytical method, based on Accelerated Solvent Extraction (ASE), with an "in-line" clean-up step and GC-MS/MS detection, was developed, validated and applied. PCBs were detected in all FAO areas, with a prevalence of 100% for most of them. In the FAO area 37, only, all PBDEs were detected. Only 5 OCs were detected. The results showed that POPs contamination of tuna reflects FAO area contamination; in particular FAO area 37 was the most polluted. Moreover, tuna muscle was an appropriate matrix for monitoring contamination and for obtaining information about food safety.

  11. The development of the northern European fishery for north Atlantic bluefin tuna Thunnus thynnus during 1900-1950

    DEFF Research Database (Denmark)

    MacKenzie, Brian; Myers, R.A.

    2007-01-01

    extremely rare. The factors which led to the development of the fishery and its subsequent decline remain unclear and poorly documented. This investigation documents the development of the fishery in terms of landings, effort, and gears with focus on the time period from 1900 to 1950 when landings were...... increasing. The species was frequently sighted while fishermen were targeting other species (herring, mackerel) and occasionally was caught as bycatch with these and other species. Information from scientifically trained observers demonstrate that tuna schools were common in the North Sea for 2–3 months...

  12. A full lifecycle bioenergetic model for bluefin tuna.

    Directory of Open Access Journals (Sweden)

    Marko Jusup

    Full Text Available We formulated a full lifecycle bioenergetic model for bluefin tuna relying on the principles of Dynamic Energy Budget theory. Traditional bioenergetic models in fish research deduce energy input and utilization from observed growth and reproduction. In contrast, our model predicts growth and reproduction from food availability and temperature in the environment. We calibrated the model to emulate physiological characteristics of Pacific bluefin tuna (Thunnus orientalis, hereafter PBT, a species which has received considerable scientific attention due to its high economic value. Computer simulations suggest that (i the main cause of different growth rates between cultivated and wild PBT is the difference in average body temperature of approximately 6.5°C, (ii a well-fed PBT individual can spawn an average number of 9 batches per spawning season, (iii food abundance experienced by wild PBT is rather constant and sufficiently high to provide energy for yearly reproductive cycle, (iv energy in reserve is exceptionally small, causing the weight-length relationship of cultivated and wild PBT to be practically indistinguishable and suggesting that these fish are poorly equipped to deal with starvation, (v accelerated growth rate of PBT larvae is connected to morphological changes prior to metamorphosis, while (vi deceleration of growth rate in the early juvenile stage is related to efficiency of internal heat production. Based on these results, we discuss a number of physiological and ecological traits of PBT, including the reasons for high Feed Conversion Ratio recorded in bluefin tuna aquaculture.

  13. Determination of temporal spawning patterns and hatching time in response to temperature of Atlantic bluefin tuna (Thunnus thynnus) in the Western Mediterranean.

    Science.gov (United States)

    Gordoa, Ana; Carreras, Gustavo

    2014-01-01

    This study analysed the temporal pattern of Atlantic bluefin tuna (ABFT) spawning in the Balearic spawning ground and examined its reproductive performance after years in captivity. Furthermore, ABFT hatching time at different on-site temperatures was determined for the first time. Spawning surveys were carried out in 4 spawning seasons (2009-2012) aboard tuna transport vessels. Three groups of spawners were monitored: a captive group transported to the spawning region and monitored throughout the four spawning seasons and two wild groups caught in 2009 and 2010 which were transferred to a monitoring transport cage immediately after being caught. Surface plankton samples were collected nightly, beginning immediately after the first purse seine catches were made and concluding after spawning was observed to have ended. All groups displayed the same spawning hours, restricted between 2:00-5:00 a.m. The captive group, as they got older, shifted towards the earliest hour, suggesting an age influence on reproductive time. The onset of spawning varied annually from the end of May to the beginning of June at temperatures around 19 °C-20 °C, ending by the second week of July. The peak of spawning was consistently around the summer solstice, June 15th-30th. The results showed the negative effect of unstable oceanographic conditions in the spawning process which might influence the annual reproductive success of ABFT. The influence of temperature on hatching time was higher than that observed in other tuna species, twice as fast at 26 °C (23 h) as at 19.5 °C (49 h). Overall, this study shows the strength of the internal mechanism in ABFT that controls spawning traits. Spawning in ABFT is cyclical and highly synchronised on diel and annual scales. We consider that the timing of spawning is rather influenced by day length and its adaptive significance is discussed.

  14. Determination of temporal spawning patterns and hatching time in response to temperature of Atlantic bluefin tuna (Thunnus thynnus in the Western Mediterranean.

    Directory of Open Access Journals (Sweden)

    Ana Gordoa

    Full Text Available This study analysed the temporal pattern of Atlantic bluefin tuna (ABFT spawning in the Balearic spawning ground and examined its reproductive performance after years in captivity. Furthermore, ABFT hatching time at different on-site temperatures was determined for the first time. Spawning surveys were carried out in 4 spawning seasons (2009-2012 aboard tuna transport vessels. Three groups of spawners were monitored: a captive group transported to the spawning region and monitored throughout the four spawning seasons and two wild groups caught in 2009 and 2010 which were transferred to a monitoring transport cage immediately after being caught. Surface plankton samples were collected nightly, beginning immediately after the first purse seine catches were made and concluding after spawning was observed to have ended. All groups displayed the same spawning hours, restricted between 2:00-5:00 a.m. The captive group, as they got older, shifted towards the earliest hour, suggesting an age influence on reproductive time. The onset of spawning varied annually from the end of May to the beginning of June at temperatures around 19 °C-20 °C, ending by the second week of July. The peak of spawning was consistently around the summer solstice, June 15th-30th. The results showed the negative effect of unstable oceanographic conditions in the spawning process which might influence the annual reproductive success of ABFT. The influence of temperature on hatching time was higher than that observed in other tuna species, twice as fast at 26 °C (23 h as at 19.5 °C (49 h. Overall, this study shows the strength of the internal mechanism in ABFT that controls spawning traits. Spawning in ABFT is cyclical and highly synchronised on diel and annual scales. We consider that the timing of spawning is rather influenced by day length and its adaptive significance is discussed.

  15. Trophic ecology of Atlantic Bluefin Tuna (Thunnus thynnus [corrected] larvae from the Gulf of Mexico and NW Mediterranean spawning grounds: A Comparative Stable Isotope Study.

    Directory of Open Access Journals (Sweden)

    Raúl Laiz-Carrión

    Full Text Available The present study uses stable isotopes of nitrogen and carbon (δ15Nandδ13C as trophic indicators for Atlantic bluefin tuna larvae (BFT (6-10 mm standard length in the highly contrasting environmental conditions of the Gulf of Mexico (GOM and the Balearic Sea (MED. These regions are differentiated by their temperature regime and relative productivity, with the GOM being significantly warmer and more productive. MED BFT larvae showed the highest δ15N signatures, implying an elevated trophic position above the underlying microzooplankton baseline. Ontogenetic dietary shifts were observed in the BFT larvae from the GOM and MED which indicates early life trophodynamics differences between these spawning habitats. Significant trophic differences between the GOM and MED larvae were observed in relation to δ15N signatures in favour of the MED larvae, which may have important implications in their growth during their early life stages.These low δ15N levels in the zooplankton from the GOM may be an indication of a shifting isotopic baseline in pelagic food webs due to diatrophic inputs by cyanobacteria. Lack of enrichment for δ15N in BFT larvae compared to zooplankton implies an alternative grazing pathway from the traditional food chain of phytoplankton-zooplankton-larval fish. Results provide insight for a comparative characterization of the trophic pathways variability of the two main spawning grounds for BFT larvae.

  16. Trophic ecology of Atlantic Bluefin Tuna (Thunnus thynnus) [corrected] larvae from the Gulf of Mexico and NW Mediterranean spawning grounds: A Comparative Stable Isotope Study.

    Science.gov (United States)

    Laiz-Carrión, Raúl; Gerard, Trika; Uriarte, Amaya; Malca, Estrella; Quintanilla, José María; Muhling, Barbara A; Alemany, Francisco; Privoznik, Sarah L; Shiroza, Akihiro; Lamkin, John T; García, Alberto

    2015-01-01

    The present study uses stable isotopes of nitrogen and carbon (δ15Nandδ13C) as trophic indicators for Atlantic bluefin tuna larvae (BFT) (6-10 mm standard length) in the highly contrasting environmental conditions of the Gulf of Mexico (GOM) and the Balearic Sea (MED). These regions are differentiated by their temperature regime and relative productivity, with the GOM being significantly warmer and more productive. MED BFT larvae showed the highest δ15N signatures, implying an elevated trophic position above the underlying microzooplankton baseline. Ontogenetic dietary shifts were observed in the BFT larvae from the GOM and MED which indicates early life trophodynamics differences between these spawning habitats. Significant trophic differences between the GOM and MED larvae were observed in relation to δ15N signatures in favour of the MED larvae, which may have important implications in their growth during their early life stages.These low δ15N levels in the zooplankton from the GOM may be an indication of a shifting isotopic baseline in pelagic food webs due to diatrophic inputs by cyanobacteria. Lack of enrichment for δ15N in BFT larvae compared to zooplankton implies an alternative grazing pathway from the traditional food chain of phytoplankton-zooplankton-larval fish. Results provide insight for a comparative characterization of the trophic pathways variability of the two main spawning grounds for BFT larvae.

  17. DISTRIBUSI PANJANG DAN ESTIMASI TOTAL TANGKAPAN TUNA SIRIP BIRU SELATAN (Thunnus maccoyii PADA MUSIM PEMIJAHAN DI SAMUDERA HINDIA

    Directory of Open Access Journals (Sweden)

    Ririk Kartika Sulistyaningsih

    2016-03-01

    Full Text Available Tuna sirip biru selatan (Thunnus maccoyii banyak ditangkap nelayan dengan alat tangkap rawai tuna di perairan selatan Jawa Timur pada musim pemijahan selama periode September – April. Untuk mendukung pengelolaan ikan tuna di Samudera Hindia dilakukan kegiatan pemantauan hasil tangkapan tuna secara kontinyu. Tulisan ini bertujuan untuk memberikan informasi tentang distribusi panjang dan estimasi total tangkapan tuna sirip biru selatan, sebagai basis data dan informasi yang diperlukan untuk penentuan kuota ikan tuna sirip biru selatan. Estimasi total tangkapan dihitung minimal 30% dari total jumlah kapal yang mendarat pada tiap-tiap perusahaan pengeskpor tuna. Pada penelitian ini berhasil dilakukan pencatatan hasil tangkapan pada 292 unit kapal dari 520 unit kapal yang mendaratkan ikan tuna. Total tangkapan tuna sirip biru selatan yang didaratkan di Pelabuhan Benoa – Bali pada musim pemijahan 2013/2014 lebih dari 900 ton. Jumlah tangkapan ini telah melebihi kuota hasil tangkapan tuna sirip biru selatan yang ditetapkan Commission for the Convervation of Shouthern Bluefin Tuna. Ukuran tuna sirip biru selatan terdistribusi mulai 103 – 208 cm, didominasi ukuran 148 cm. Panjang tuna sirip biru selatan pertama kali tertangkap pada saat memijah adalah 160 cm. Shouthern bluefin tuna (Thunnus maccoyii mostly caught by Indonesian fishers using longline in the spawning season in East Java waters, in September to April. This paper aims were give information about size distribution and to estimate the total catch of shouthern bluefin tuna as the data basis and information that needed to determine the quota of southern bluefin tuna. The target to estimate total catch was minimum of 30% from the total vessel landings in each processing plant. In this research total samplings were 292 boats from 520 boats landed. Total catch estimates of shouthern bluefin tuna landed in Benoa Port – Bali in the spawning season in 2013/2014 was more than 900 tonnes. This

  18. PCB and OCP accumulation and evidence of hepatic alteration in the Atlantic bluefin tuna, T. thynnus, from the Mediterranean Sea.

    Science.gov (United States)

    Maisano, Maria; Cappello, Tiziana; Oliva, Sabrina; Natalotto, Antonino; Giannetto, Alessia; Parrino, Vincenzo; Battaglia, Pietro; Romeo, Teresa; Salvo, Andrea; Spanò, Nunziacarla; Mauceri, Angela

    2016-10-01

    Persistent organic pollutants (POPs) are known to act as "obesogens", being fat-soluble and affecting lipid metabolism. The Atlantic bluefin tuna, Thunnus thynnus, are top pelagic predators prone to bioaccumulate and biomagnify environmental contaminants. This study aimed at evaluating POPs-induced ectopic lipid accumulation in liver of adult tuna from the Mediterranean Sea. PCBs and organochlorine pesticides were measured in tuna liver, and marked morphological changes observed, namely poorly compacted tissues, intense vacuolization, erythrocyte infiltration and presence of melanomacrophages. The expression of perilipin, a lipid-droplet marker, positively correlated with the gene expression of PPARγ, a master regulator of adipogenesis, and its heterodimeric partner, RXRα. Changes in metabolites involved in fatty acid biosynthesis and ketogenesis were also observed. Although male bluefin tuna appeared to be more sensitive than females to the adverse effects of environmental obesogens, the alterations observed in tuna liver of both sexes suggest a potential onset of hepatic steatosis.

  19. Spawning of bluefin tuna in the black sea: historical evidence, environmental constraints and population plasticity

    DEFF Research Database (Denmark)

    Mackenzie, Brian R; Mariani, Patrizio

    2012-01-01

    The lucrative and highly migratory Atlantic bluefin tuna, Thunnus thynnus (Linnaeus 1758; Scombridae), used to be distributed widely throughout the north Atlantic Ocean, Mediterranean Sea and Black Sea. Its migrations have supported sustainable fisheries and impacted local cultures since antiquity...... and possibly spawned in the Black Sea. Loss of a locally-reproducing population would represent a decline in population richness, and an increase in species vulnerability to perturbations such as exploitation and environmental change. Here we identify the main genetic and phenotypic adaptations...

  20. A cascade of warming impacts brings bluefin tuna to Greenland waters.

    Science.gov (United States)

    MacKenzie, Brian R; Payne, Mark R; Boje, Jesper; Høyer, Jacob L; Siegstad, Helle

    2014-08-01

    Rising ocean temperatures are causing marine fish species to shift spatial distributions and ranges, and are altering predator-prey dynamics in food webs. Most documented cases of species shifts so far involve relatively small species at lower trophic levels, and consider individual species in ecological isolation from others. Here, we show that a large highly migratory top predator fish species has entered a high latitude subpolar area beyond its usual range. Bluefin tuna, Thunnus thynnus Linnaeus 1758, were captured in waters east of Greenland (65°N) in August 2012 during exploratory fishing for Atlantic mackerel, Scomber scombrus Linnaeus 1758. The bluefin tuna were captured in a single net-haul in 9-11 °C water together with 6 tonnes of mackerel, which is a preferred prey species and itself a new immigrant to the area. Regional temperatures in August 2012 were historically high and contributed to a warming trend since 1985, when temperatures began to rise. The presence of bluefin tuna in this region is likely due to a combination of warm temperatures that are physiologically more tolerable and immigration of an important prey species to the region. We conclude that a cascade of climate change impacts is restructuring the food web in east Greenland waters.

  1. Effect of thermal acclimation on action potentials and sarcolemmal K+ channels from Pacific bluefin tuna cardiomyocytes.

    Science.gov (United States)

    Galli, G L J; Lipnick, M S; Block, B A

    2009-08-01

    To sustain cardiac muscle contractility relatively independent of temperature, some fish species are capable of temporarily altering excitation-contraction coupling processes to meet the demands of their environment. The Pacific bluefin tuna, Thunnus orientalis, is a partially endothermic fish that inhabits a wide range of thermal niches. The present study examined the effects of temperature and thermal acclimation on sarcolemmal K(+) currents and their role in action potential (AP) generation in bluefin tuna cardiomyocytes. Atrial and ventricular myocytes were enzymatically isolated from cold (14 degrees C)- and warm (24 degrees C)-acclimated bluefin tuna. APs and current-voltage relations of K(+) channels were measured using the whole cell current and voltage clamp techniques, respectively. Data were collected either at the cardiomyocytes' respective acclimation temperature of 14 or 24 degrees C or at a common test temperature of 19 degrees C (to reveal the effects of acclimation). AP duration (APD) was prolonged in cold-acclimated (CA) cardiomyocytes tested at 14 degrees C compared with 19 degrees C and in warm-acclimated (WA) cardiomyocytes tested at 19 degrees C compared with 24 degrees C. This effect was mirrored by a decrease in the density of the delayed-rectifier current (I(Kr)), whereas the density of the background inward-rectifier current (I(K1)) was unchanged. When CA and WA cardiomyocytes were tested at a common temperature of 19 degrees C, no significant effects of temperature acclimation on AP shape or duration were observed, whereas I(Kr) density was markedly increased in CA cardiomyocytes. I(K1) density was unaffected in CA ventricular myocytes but was significantly reduced in CA atrial myocytes, resulting in a depolarization of atrial resting membrane potential. Our results indicate the bluefin AP is relatively short compared with other teleosts, which may allow the bluefin heart to function at cold temperatures without the necessity for thermal

  2. A validated methodology for genetic identification of tuna species (genus Thunnus.

    Directory of Open Access Journals (Sweden)

    Jordi Viñas

    Full Text Available BACKGROUND: Tuna species of the genus Thunnus, such as the bluefin tunas, are some of the most important and yet most endangered trade fish in the world. Identification of these species in traded forms, however, may be difficult depending on the presentation of the products, which may hamper conservation efforts on trade control. In this paper, we validated a genetic methodology that can fully distinguish between the eight Thunnus species from any kind of processed tissue. METHODOLOGY: After testing several genetic markers, a complete discrimination of the eight tuna species was achieved using Forensically Informative Nucleotide Sequencing based primarily on the sequence variability of the hypervariable genetic marker mitochondrial DNA control region (mtDNA CR, followed, in some specific cases, by a second validation by a nuclear marker rDNA first internal transcribed spacer (ITS1. This methodology was able to distinguish all tuna species, including those belonging to the subgenus Neothunnus that are very closely related, and in consequence can not be differentiated with other genetic markers of lower variability. This methodology also took into consideration the presence of introgression that has been reported in past studies between T. thynnus, T. orientalis and T. alalunga. Finally, we applied the methodology to cross-check the species identity of 26 processed tuna samples. CONCLUSIONS: Using the combination of two genetic markers, one mitochondrial and another nuclear, allows a full discrimination between all eight tuna species. Unexpectedly, the genetic marker traditionally used for DNA barcoding, cytochrome oxidase 1, could not differentiate all species, thus its use as a genetic marker for tuna species identification is questioned.

  3. Bluefin tuna fishing and ranching: a difficult management problem

    NARCIS (Netherlands)

    Stefano, de V.; Heijden, van der P.G.M.

    2007-01-01

    The fish processing industry and consumers in Japan are willing to pay high (and sometimes outrageous) prices for fresh bluefin tuna with fat content and flesh colour just right to be served raw as sashimi or sushi. This willingness was and still is the economic incentive for a high fishing pressure

  4. Climate effects on historic bluefin tuna captures in the Gibraltar Strait and Western Mediterranean

    Science.gov (United States)

    Ganzedo, Unai; Polanco-Martínez, Josué M.; Caballero-Alfonso, Ángela M.; Faria, Sérgio H.; Li, Jianke; Castro-Hernández, José J.

    2016-06-01

    Historical capture records of bluefin tuna (Thunnus thynnus; BFT hereafter) from the Gibraltar Strait and Western Mediterranean show pronounced short- and long-term fluctuations. Some of these fluctuations are believed to be associated with biological and ecological process, as well as distinct climate factors. For the period of study (1700-1936) of this work, we found a long-term increasing trend in the BFT captures and in the climate variables. After applying a statistical time series analysis of relevant climate variables and long-term tuna capture records, it is highlighted the role played by sea-surface temperature (SST) on bluefin population variations. The most relevant result of this study is the strong correlation found between the total solar irradiance (TSI) - an external component of the climate system - and bluefin captures. The solar irradiance could have affected storminess during the period under study, mainly during the time interval 1700-1810. We suggest physico-biological mechanisms that explain the BFT catch fluctuations in two consecutive time intervals. In the first period, from 1700 to 1810, this mechanism could be high storm and wind activity, which would have made the BFT fisheries activities more difficult by reducing their efficacy. In contrast, during the interval from 1810 to 1907, the effects of wind and storms could be on spawning behaviour and larval ecology, and hence on year class strength, rather than on fish or fisherman's behaviour. These findings open up a range of new lines of enquiry that are relevant for both, fisheries and climate change research.

  5. Habitat and behaviour of yellowfin tuna Thunnus albacares in the Gulf of Mexico determined using pop-up satellite archival tags.

    Science.gov (United States)

    Weng, K C; Stokesbury, M J W; Boustany, A M; Seitz, A C; Teo, S L H; Miller, S K; Block, B A

    2009-05-01

    This study presents the first data on movement, habitat use and behaviour for yellowfin tuna Thunnus albacares in the Atlantic Basin. Six individuals were tracked in the Gulf of Mexico using pop-up satellite archival tags. Records up to 80 days in length were obtained, providing information on depth and temperature preferences as well as horizontal movements. Thunnus albacares in the Gulf of Mexico showed a strong preference for the mixed layer and thermocline, consistent with findings for this species in other ocean basins. Fish showed a diel pattern in depth distribution, remaining in surface and mixed layer waters at night and diving to deeper waters during the day. The vertical extent of T. albacares habitat appeared to be temperature limited, with fish generally avoiding waters that were >6 degrees C cooler than surface waters. The vertical and thermal habitat usage of T. albacares differs from that of bigeye Thunnus obesus and bluefin Thunnus thynnus, Thunnus orientalis and Thunnus maccoyii tunas. These results are consistent with the results of earlier studies conducted on T. albacares in other oceans.

  6. Quantifying overlap between the Deepwater Horizon oil spill and predicted bluefin tuna spawning habitat in the Gulf of Mexico

    Science.gov (United States)

    Hazen, Elliott L.; Carlisle, Aaron B.; Wilson, Steven G.; Ganong, James E.; Castleton, Michael R.; Schallert, Robert J.; Stokesbury, Michael J. W.; Bograd, Steven J.; Block, Barbara A.

    2016-09-01

    Atlantic bluefin tuna (Thunnus thynnus) are distributed throughout the North Atlantic and are both economically valuable and heavily exploited. The fishery is currently managed as two spawning populations, with the GOM population being severely depleted for over 20 years. In April-August of 2010, the Deepwater Horizon oil spill released approximately 4 million barrels of oil into the GOM, with severe ecosystem and economic impacts. Acute oil exposure results in mortality of bluefin eggs and larvae, while chronic effects on spawning adults are less well understood. Here we used 16 years of electronic tagging data for 66 bluefin tuna to identify spawning events, to quantify habitat preferences, and to predict habitat use and oil exposure within Gulf of Mexico spawning grounds. More than 54,000 km2 (5%) of predicted spawning habitat within the US EEZ was oiled during the week of peak oil dispersal, with potentially lethal effects on eggs and larvae. Although the oil spill overlapped with a relatively small portion of predicted spawning habitat, the cumulative impact from oil, ocean warming and bycatch mortality on GOM spawning grounds may result in significant effects for a population that shows little evidence of rebuilding.

  7. Quantifying overlap between the Deepwater Horizon oil spill and predicted bluefin tuna spawning habitat in the Gulf of Mexico.

    Science.gov (United States)

    Hazen, Elliott L; Carlisle, Aaron B; Wilson, Steven G; Ganong, James E; Castleton, Michael R; Schallert, Robert J; Stokesbury, Michael J W; Bograd, Steven J; Block, Barbara A

    2016-09-22

    Atlantic bluefin tuna (Thunnus thynnus) are distributed throughout the North Atlantic and are both economically valuable and heavily exploited. The fishery is currently managed as two spawning populations, with the GOM population being severely depleted for over 20 years. In April-August of 2010, the Deepwater Horizon oil spill released approximately 4 million barrels of oil into the GOM, with severe ecosystem and economic impacts. Acute oil exposure results in mortality of bluefin eggs and larvae, while chronic effects on spawning adults are less well understood. Here we used 16 years of electronic tagging data for 66 bluefin tuna to identify spawning events, to quantify habitat preferences, and to predict habitat use and oil exposure within Gulf of Mexico spawning grounds. More than 54,000 km(2) (5%) of predicted spawning habitat within the US EEZ was oiled during the week of peak oil dispersal, with potentially lethal effects on eggs and larvae. Although the oil spill overlapped with a relatively small portion of predicted spawning habitat, the cumulative impact from oil, ocean warming and bycatch mortality on GOM spawning grounds may result in significant effects for a population that shows little evidence of rebuilding.

  8. Simple measurements reveal the feeding history, the onset of reproduction, and energy conversion efficiencies in captive bluefin tuna

    Science.gov (United States)

    Jusup, Marko; Klanjšček, Tin; Matsuda, Hiroyuki

    2014-11-01

    We present a numerical approach that, in conjunction with a fully set up Dynamic Energy Budget (DEB) model, aims at consistently approximating the feeding history of cultivated fish from the commonly measured aquaculture data (body length, body mass, or the condition factor). We demonstrate the usefulness of the approach by performing validation of a DEB-based model for Pacific bluefin tuna (Thunnus orientalis) on an independent dataset and exploring the implied bioenergetics of this species in captivity. In the context of validation, the results indicate that the model successfully accounts for more than 75% of the variance in actual fish feed. At the 5% significance level, predictions do not underestimate nor overestimate observations and there is no bias. The overall model accuracy of 87.6% is satisfactory. In the context of tuna bioenergetics, we offer an explanation as to why the first reproduction in the examined case occurred only after the fish reached seven years of age, whereas it takes five years in the wild and sometimes as little as three years in captivity. Finally, we calculate energy conversion efficiencies and the supply stress throughout the entire lifetime to theoretically underpin the relatively low contribution of growth to aerobic metabolism implied by respirometry and high feed conversion ratio observed in bluefin tuna aquaculture.

  9. Atlantic bluefin tuna: a novel multistock spatial model for assessing population biomass.

    Directory of Open Access Journals (Sweden)

    Nathan G Taylor

    Full Text Available Atlantic bluefin tuna (Thunnus thynnus is considered to be overfished, but the status of its populations has been debated, partly because of uncertainties regarding the effects of mixing on fishing grounds. A better understanding of spatial structure and mixing may help fisheries managers to successfully rebuild populations to sustainable levels while maximizing catches. We formulate a new seasonally and spatially explicit fisheries model that is fitted to conventional and electronic tag data, historic catch-at-age reconstructions, and otolith microchemistry stock-composition data to improve the capacity to assess past, current, and future population sizes of Atlantic bluefin tuna. We apply the model to estimate spatial and temporal mixing of the eastern (Mediterranean and western (Gulf of Mexico populations, and to reconstruct abundances from 1950 to 2008. We show that western and eastern populations have been reduced to 17% and 33%, respectively, of 1950 spawning stock biomass levels. Overfishing to below the biomass that produces maximum sustainable yield occurred in the 1960s and the late 1990s for western and eastern populations, respectively. The model predicts that mixing depends on season, ontogeny, and location, and is highest in the western Atlantic. Assuming that future catches are zero, western and eastern populations are predicted to recover to levels at maximum sustainable yield by 2025 and 2015, respectively. However, the western population will not recover with catches of 1750 and 12,900 tonnes (the "rebuilding quotas" in the western and eastern Atlantic, respectively, with or without closures in the Gulf of Mexico. If future catches are double the rebuilding quotas, then rebuilding of both populations will be compromised. If fishing were to continue in the eastern Atlantic at the unregulated levels of 2007, both stocks would continue to decline. Since populations mix on North Atlantic foraging grounds, successful rebuilding

  10. Mitochondrial DNA analysis reveals three stocks of yellowfin tuna Thunnus albacares (Bonnaterre, 1788) in Indian waters

    Digital Repository Service at National Institute of Oceanography (India)

    Kunal, S.P.; GirishKumar; Menezes, M.R.; Meena, R.M.

    is yellowfin tuna Thunnus albacares (YFT), distributed globally in areas of the Pacific, Atlantic and Indian Ocean having surface temperature above 18° C (Collette and Nauen 1983). Globally, YFT contributes approximately 27 % of all tuna catches, making... it second largest among principal market tunas (FAO, 2012). Similarly, they are the most dominant species among larger pelagic fishes and contribute approximately 19% of all tuna catches in Indian waters (Vijayakumaran and Verghese 2010). The key...

  11. Temperature sensitivity of cardiac function in pelagic fishes with different vertical mobilities: yellowfin tuna (Thunnus albacares), bigeye tuna (Thunnus obesus), mahimahi (Coryphaena hippurus), and swordfish (Xiphias gladius).

    Science.gov (United States)

    Galli, Gina L J; Shiels, Holly A; Brill, Richard W

    2009-01-01

    We measured the temperature sensitivity, adrenergic sensitivity, and dependence on sarcoplasmic reticulum (SR) Ca(2+) of ventricular muscle from pelagic fishes with different vertical mobility patterns: bigeye tuna (Thunnus obesus), yellowfin tuna (Thunnus albacares), and mahimahi (Coryphaena hippurus) and a single specimen from swordfish (Xiphias gladius). Ventricular muscle from the bigeye tuna and mahimahi exhibited a biphasic response to an acute decrease in temperature (from 26 degrees to 7 degrees C); twitch force and kinetic parameters initially increased and then declined. The magnitude of this response was larger in the bigeye tuna than in the mahimahi. Under steady state conditions at 26 degrees C, inhibition of SR Ca(2+) release and reuptake with ryanodine and thapsigargin decreased twitch force and kinetic parameters, respectively, in the bigeye tuna only. However, the initial inotropy associated with decreasing temperature was abolished by SR inhibition in both the bigeye tuna and the mahimahi. Application of adrenaline completely reversed the effects of ryanodine and thapsigargin, but this effect was diminished at cold temperatures. In the yellowfin tuna, temperature and SR inhibition had minor effects on twitch force and kinetics, while adrenaline significantly increased these parameters. Limited data suggest that swordfish ventricular muscle responds to acute temperature reduction, SR inhibition, and adrenergic stimulation in a manner similar to that of bigeye tuna ventricular muscle. In aggregate, our results show that the temperature sensitivity, SR dependence, and adrenergic sensitivity of pelagic fish hearts are species specific and that these differences reflect species-specific vertical mobility patterns.

  12. A cascade of warming impacts brings bluefin tuna to Greenland waters

    DEFF Research Database (Denmark)

    MacKenzie, Brian; Payne, Mark; Boje, Jesper;

    since 1985, when temperatures began to rise. The presence of bluefin tuna in this region is likely due to a combination of warm temperatures that are physiologically more tolerable and immigration of an important prey species into the region. We conclude that a cascade of climate change impacts......, Scomber scombrus Linnaeus 1758. The bluefin tuna were captured in a single net-haul in 9-11o C water together with 6 tonnes of mackerel, which is a preferred prey species and itself a new immigrant to the area. Regional temperatures in August 2012 were historically high and contributed to a warming trend...

  13. Radioactive Cesium from Fukushima Japan Detected in Bluefin Tuna off California: Implications for Public Health and for Tracking Migration

    Directory of Open Access Journals (Sweden)

    Fisher N. S.

    2013-04-01

    Full Text Available Bluefin tuna are highly migratory pelagic fish. Pacific bluefin tuna are spawned in waters off Japan and some juveniles migrate across the Pacific to waters off California. Bluefin that had recently migrated and caught in waters off San Diego, California in August 2011 were found to have 134Cs and 137Cs in their muscle tissue, at concentrations that could only have come from the Fukushima nuclear reactor in Japan. Bluefin tuna caught 3 years earlier off San Diego and yellowfin tuna that are resident to the eastern Pacific had no 134Cs and only background levels of 137Cs. The radioactivity in tuna attributable to these Cs isotopes was only 2.8% of that from the naturally occurring 40K, suggesting that consumption of these fish poses little risk to public health. The presence of these isotopes in animal tissues can be used to discern migratory routes and timing for those animals that use the western Pacific.

  14. Canned bluefin tuna, an in vitro cardioprotective functional food potentially safer than commercial fish oil based pharmaceutical formulations.

    Science.gov (United States)

    Tenore, Gian Carlo; Calabrese, Giorgio; Ritieni, Alberto; Campiglia, Pietro; Giannetti, Daniela; Novellino, Ettore

    2014-09-01

    Commercial canned fish species typical in the Italian market were evaluated for their lipid profile. Bluefin tuna samples showed the highest content in omega-3 fatty acids (n-3 PUFA) among the canned fish samples analyzed. Tests on H9C2 cardiomyocytes revealed that bluefin tuna n-3 PUFA may responsible for a significant cell protection against both physiological and doxorubicin-induced oxidative stress. Analogous tests performed by incubating cardiac cells with n-3 PUFA ethyl esters, of which most of fish oil pharmaceutical formulations (FOPF) are based, showed cytotoxicity at high doses. Our results highlighted that n-3 PUFA contents in a 50 g canned bluefin tuna portion would be almost equivalent to and potentially safer than those of 1 FOPF capsule (1000 mg)/die usually suggested for hyperlipidaemic subjects. Thus, Italian commercial canned bluefin tuna could be indicated as a functional food with potential health benefits for the prevention and care of cardiovascular disorders.

  15. Comparative influence of ocean conditions on yellowfin and Atlantic bluefin tuna catch from longlines in the Gulf of Mexico.

    Directory of Open Access Journals (Sweden)

    Steven L H Teo

    Full Text Available Directed fishing effort for Atlantic bluefin tuna in the Gulf of Mexico (GOM, their primary spawning grounds in the western Atlantic, has been prohibited since the 1980s due to a precipitous decline of the spawning stock biomass. However, pelagic longlines targeted at other species, primarily yellowfin tuna and swordfish, continue to catch Atlantic bluefin tuna in the GOM as bycatch. Spatial and temporal management measures minimizing bluefin tuna bycatch in the GOM will likely become important in rebuilding the western Atlantic bluefin stock. In order to help inform management policy and understand the relative distribution of target and bycatch species in the GOM, we compared the spatiotemporal variability and environmental influences on the catch per unit effort (CPUE of yellowfin (target and bluefin tuna (bycatch. Catch and effort data from pelagic longline fisheries observers (1993-2005 and scientific tagging cruises (1998-2002 were coupled with environmental and biological data. Negative binomial models were used to fit the data for both species and Akaike's Information Criterion (corrected for small sample size was used to determine the best model. Our results indicate that bluefin CPUE had higher spatiotemporal variability as compared to yellowfin CPUE. Bluefin CPUE increased substantially during the breeding months (March-June and peaked in April and May, while yellowfin CPUE remained relatively high throughout the year. In addition, bluefin CPUE was significantly higher in areas with negative sea surface height anomalies and cooler sea surface temperatures, which are characteristic of mesoscale cyclonic eddies. In contrast, yellowfin CPUE was less sensitive to environmental variability. These differences in seasonal variability and sensitivity to environmental influences suggest that bluefin tuna bycatch in the GOM can be reduced substantially by managing the spatial and temporal distribution of the pelagic longline effort without

  16. A cascade of warming impacts brings bluefin tuna to Greenland waters

    DEFF Research Database (Denmark)

    MacKenzie, Brian R.; Payne, Mark R.; Boje, Jesper;

    2014-01-01

    for Atlantic mackerel, Scomber scombrus Linnaeus 1758. The bluefin tuna were captured in a single net-haul in 9-11 °C water together with 6 tonnes of mackerel, which is a preferred prey species and itself a new immigrant to the area. Regional temperatures in August 2012 were historically high and contributed...... to a warming trend since 1985, when temperatures began to rise. The presence of bluefin tuna in this region is likely due to a combination of warm temperatures that are physiologically more tolerable and immigration of an important prey species to the region. We conclude that a cascade of climate change...... impacts is restructuring the food web in east Greenland waters....

  17. Computational Fluid Dynamics of the Boundary Layer Characteristics of a Pacific Bluefin Tuna

    Science.gov (United States)

    2015-09-18

    GENERATING THE MODELS AND MESHES 2.1.1 CAD Model A juvenile Pacific Bluefin tuna was harvested from the Tuna Research and Conservation Center...MESH 6.1 REFERENCE VALUES Compute From: Fluid Domain Area : 0.2 m^2 Density: 998 kg/m^3 Length: 0.81 m Velocity: 10 m/s Viscosity: 8.94E-04 Pa*s...14 Table 2. Parameter Values for the 3D Model (Cont’d) 6. DYNAMIC MESH 6.1 REFERENCE VALUES Compute From: Fluid Domain Area : 0.2 m^2 Density

  18. Discrimination of juvenile yellowfin (Thunnus albacares and bigeye (T. obesus Tunas using mitochondrial DNA control region and liver morphology.

    Directory of Open Access Journals (Sweden)

    Ivane R Pedrosa-Gerasmio

    Full Text Available Yellowfin tuna, Thunnus albacares (Bonnaterre, 1788 and bigeye tuna, Thunnus obesus (Lowe, 1839 are two of the most economically important tuna species in the world. However, identification of their juveniles, especially at sizes less than 40 cm, is very difficult, often leading to misidentification and miscalculation of their catch estimates. Here, we applied the mitochondrial DNA control region D-loop, a recently validated genetic marker used for identifying tuna species (Genus Thunnus, to discriminate juvenile tunas caught by purse seine and ringnet sets around fish aggregating devices (FADs off the Southern Iloilo Peninsula in Central Philippines. We checked individual identifications using the Neighbor-Joining Method and compared results with morphometric analyses and the liver phenotype. We tested 48 specimens ranging from 13 to 31 cm fork length. Morpho-meristic analyses suggested that 12 specimens (25% were bigeye tuna and 36 specimens (75% were yellowfin tuna. In contrast, the genetic and liver analyses both showed that 5 specimens (10% were bigeye tuna and 43 (90% yellowfin tuna. This suggests that misidentification can occur even with highly stringent morpho-meristic characters and that the mtDNA control region and liver phenotype are excellent markers to discriminate juveniles of yellowfin and bigeye tunas.

  19. Total mercury in canned yellowfin tuna Thunnus albacares marketed in northwest Mexico.

    Science.gov (United States)

    Ruelas-Inzunza, Jorge; Patiño-Mejía, Carlos; Soto-Jiménez, Martín; Barba-Quintero, Guillermo; Spanopoulos-Hernández, Milton

    2011-12-01

    Mercury (Hg) was determined in Thunnus albacares canned in oil (from 7 to 10 samples per brand) and water (from 5 to 10 samples per brand) of five leading brands in Mexico in 2008. Potential health risk was estimated on the basis of Hg concentration and rate (1.43 kg year(-1)per capita) of tuna consumption in Mexico. Highest Hg concentrations were 0.51 ± 0.26 and 0.40 ± 0.24 μ gg(-1) dry weight in water and oil, respectively. Averaged Hg concentrations in tuna canned in water in the current study were comparable to values in Katsuwonus pelamis from Alabama; regarding the oil presentation, Hg levels were lower than in canned tuna collected in Mexico and comparable to values in canned tuna (species not identified) from Turkey. Hazard quotients were 0.0166 and 0.012 in water and oil, respectively. For the analyzed brands and considering tuna consumption in Mexican population, reference dose for this element was not exceeded; therefore, no human health risk is likely to occur. More work is necessary in relation to exposure to Hg from other sources, rates of consumption in strata of population with elevated fish consumption, size of canned tuna and on the role of Se against Hg toxicity.

  20. Acanthocephalan (Echinorhynchus sp. infection of yellowfin tuna (Thunnus albacares from Nagapattinam, south east coast of India

    Directory of Open Access Journals (Sweden)

    Alagarsamy Sakthive

    2014-08-01

    Full Text Available Objective: To recored the infection of Acanthocephalan parasite, (Echinorhynchus sp. in adult yellowfin tuna (Thunnus albacares. This is the first report of acanthocephalan Echinirhynchus sp attached to yellowfin tuna and moreover prevalence, mean intensity and mean abundance was observed. Methods: Totally 1 001 yellowfin tuna fishes were collected throughout the year of 2012 from the coast of Nagapattinam (10°45' 36.25" N and 79°50' 59.54" E, Tamil Nadu, India. The collected fishes were washed with fresh water to remove debris and immediately stored in ice, and brought to the laboratory. Intestines were placed in normal saline (0.85% NaCl. The worms were fixed in alcohol/ formalin /(AFA fixative and in 70% ethanol until processed for identification. Results: Totally 1 001 yellowfin tuna was examined out of 387 (52.67% hosts were infected with acanthocephalan (Echinorhynchus sp.. The proboscis Echinorhynchus sp. was long, cylindrical with cylindrical with a uniform width measured (0.41±0.02 mm in length and (0.12±0.03 mm in width. The endo parasite prevalence, intensity and abundance was recorded as 52.67%, 12.46%, and 5.43% respectively. Conclusions: This current phenomena was carried out to report of acanthocephalan Echinorhynchus sp. attached the new host of yellowfin tuna from Nagapattinam coast. Moreover, parasitological investigations are required to determine endo parasites of host due to its importance and numerous occurring among most important marine food fishes in world wild.

  1. Vertical Movements, Behavior and Habitat Utilization of Adult Yellowfin Tuna (Thunnus albacares) Tagged in West Philippine Sea, Mindoro Island, Philippines

    NARCIS (Netherlands)

    Macusi, Edison; Babaran, R.P.; Ingles, J.T.

    2015-01-01

    This paper describes the vertical movements, behavior and habitat utilization of an electronically tagged adult yellowfin tuna (Thunnus albacares) after 17 days of liberty in the Philippines based on analyses of 23,845 datapoints recorded from a recovered electronic popup tag. The exhaustive set pro

  2. Spatially explicit estimates of stock sizes, structure and biomass of herring and blue whiting, and catch data of bluefin tuna

    DEFF Research Database (Denmark)

    Huse, G.; MacKenzie, B. R.; Trenkel, V.;

    2015-01-01

    The North Atlantic is a productive marine region which has supported important commercial fisheries for centuries. Many of these fisheries have exploited the pelagic species, including herring, blue whiting and tuna. Here we present data on the distribution of herring and blue whiting based...... on the international ecosystem survey in the Nordic Seas (IESNS), the bottom trawl survey in the Bay of Biscay and Celtic Sea (EVHOE) and the pelagic survey in the Bay of Biscay (PELGAS). We also present catch data on bluefin tuna, which has been depleted for decades but historically used to be a key predator...... on the other pelagic stocks during summer. The results show that there were substantial changes in the herring and blue whiting distribution during the 1990s and early 2000s. The earliest bluefin tuna catches noted were in 1907. The catches in the Norwegian Sea area peaked in the 1950s and there have been very...

  3. ESTIMATION OF PRIMARY PRODUCTIVITY FOR TUNA IN INDIAN OCEAN

    Directory of Open Access Journals (Sweden)

    Ende Kasma

    2012-11-01

    Full Text Available Indonesia has abundant fisheries potency, one of fisheries potency in Indian Ocean is tuna fish. Primary productivity data used as indicator of tuna fisheries potency in Idian Ocean.Research location is in Indian Ocean 070 - 210 S and 1070 - 1210 E. Weekly satellite data in 2007 used are chlorophyl, sea surface temperature, Photosynthetic Available Radiation (PAR and euphotic zone (Zeu data. Daily fisheries data is from tuna fish catching data 2007 in PT. Perikanan Samudera Besar (PT. PSB. Satellite data is processed by Vertically Generalized Production Model (VGPM formula to obtained primary productivity. Tuna fish catching data correlated to satellite data to know correlation of primary productivity value to fish catching data.Result of this research is there four species of tuna fish catch in Indian Ocean, that are Madidihang or Yellowfin tuna (Thunnus albacores, Bigeye tuna (Thunnus obesus, Southtern Bluefin tuna (Thunnus macoyii, and Albacore (Thunnus alalunga. Where 73% tuna fish is Bigeye tuna. Bigeye, Albacore and Yellowfin tuna are produced annually, while Southern Bluefin tuna in northwest monsoon is no fish production. Chlorophyll-a, sea surface temperature and primary productivity value in research location are from 0,06 mg/m3 to 0,38 mg/m3, from 24,640C to 31,820C, and from 73,22mgC/m2 to 658,57 mgC/m2 respectively. Coefficient correlation in primary productivity and fish catching in fishing ground area is small (r = 0.008, its explained that, fish catching number is not influenced by primary productivity. In high or low primary productivity condition tuna fish catched in Indian Ocean area. Potential fishing ground area of Bigeye tuna, Albacore, Yellowfin and Southern Bluefin tuna in Indian Ocean are in 110 – 160 S and 1060 – 1210 E, the primary productivity value is from 73 mgC/m2day to 732 mgC/m2day and differences of sea surface temperature value of tuna fish are from 240 C to 310 C, 240 C to 300 C, and 250 C to 310 C for

  4. Acanthocephalan (Echinorhynchus sp.) infection of yellowfin tuna (Thunnus albacares) from Nagapattinam, south east coast of India

    Institute of Scientific and Technical Information of China (English)

    Alagarsamy Sakthivel; Periyasamy Selvakumar; Ayyaru Gopalakrishnan

    2014-01-01

    Objective:To recored the infection of Acanthocephalan parasite, (Echinorhynchus sp.) in adult yellowfin tuna (Thunnus albacares). This is the first report of acanthocephalan Echinirhynchus sp attached to yellowfin tuna and moreover prevalence, mean intensity and mean abundance was observed. Methods:Totally 1 001 yellowfin tuna fishes were collected throughout the year of 2012 from the coast of Nagapattinam (10°45' 36.25"N and 79°50' 59.54"E), Tamil Nadu, India. The collected fishes were washed with fresh water to remove debris and immediately stored in ice, and brought to the laboratory. Intestines were placed in normal saline (0.85%NaCl). The worms were fixed in alcohol/formalin/(AFA) fixative and in 70%ethanol until processed for identification. Results:Totally 1 001 yellowfin tuna was examined out of 387 (52.67%) hosts were infected with acanthocephalan (Echinorhynchus sp.). The proboscis Echinorhynchus sp. was long, cylindrical with cylindrical with a uniform width measured (0.41±0.02) mm in length and (0.12±0.03) mm in width. The endo parasite prevalence, intensity and abundance was recorded as 52.67%, 12.46%, and 5.43%respectively. Conclusions: This current phenomena was carried out to report of acanthocephalan Echinorhynchus sp. attached the new host of yellowfin tuna from Nagapattinam coast. Moreover, parasitological investigations are required to determine endo parasites of host due to its importance and numerous occurring among most important marine food fishes in world wild.

  5. Age and growth estimation of bigeye tuna, Thunnus obesus (Teleostei: Scombridae in the southwestern Atlantic

    Directory of Open Access Journals (Sweden)

    Paulo Duarte-Neto

    Full Text Available The purpose of the current study was to supply the first information on age and growth for Thunnus obesus caught in the equatorial south-western Atlantic using dorsal spines, an approach that has been successfully employed for ageing tuna species. The study was conducted using a multi-model inference based on information theory for back-calculated and observed length-at-age data. Uncertainty associated with the parameter estimation was verified and results were compared to other accounts on the species, considering both the statistical and methodological contexts. Samples were collected in Natal city (Rio Grande do Norte State, Brazil from February 1999 to January 2000, of tuna vessels and from surveys, aimed at providing information on the Brazilian Exclusive Economic Zone (EEZ in the area around São Pedro and São Paulo Archipelago. Validation using marginal increment indicated that one ring is deposited per year. Mean length-at-age ranged of 54.3 to 177.5 cm (fork length for ages 1 to 9 years. Von Bertalanffy, Richards, and Gompertz models were considered suitable for the bigeye tuna. Hence, the model-averaged asymptotic length ¯L∞ was estimated. The averaged model generated in the present study by back-calculation was considered appropriate for describing the growth of T. obesus.

  6. Spatiotemporal variability in bigeye tuna ( Thunnus obesus) dive behavior in the central North Pacific Ocean

    Science.gov (United States)

    Howell, Evan A.; Hawn, Donald R.; Polovina, Jeffrey J.

    2010-07-01

    Data from 29 pop-up archival transmission (PAT) tags deployed on commercial-size bigeye tuna ( Thunnus obesus) in the central North Pacific Ocean from 4°N to 32°N were analyzed to describe variability in their dive behavior across space and time. During the day, bigeye tuna generally spent time in the 0-50 m and 300-400 m depth ranges, with spatial and temporal variability in the deep mode. At night, bigeye tuna generally inhabited the 0-100 m depth range. Three daily dive types were defined based on the percentage of time tuna spent in specific depth layers during the day. These three types were defined as shallow, intermediate, and deep and represented 24.4%, 18.8%, and 56.8% of the total number of days in the study, respectively. More shallow and intermediate dive-type behavior was found in the first half of the year, and in latitudes from 14°N to 16°N and north of 28°N. A greater amount of deep-dive behavior was found in the regions south of 10°N and between 18°N and 28°N during the third and fourth quarters of the year. Dive-type behavior also varied with oceanographic conditions, with more shallow and intermediate behavior found in colder surface waters. Intermediate and deep-dive types were pooled to reflect the depths where bigeye tuna may have potential interactions with fishing gear. A Generalized Additive Model was used to quantify the effects of time, space, and sea surface temperature on this pooled dive type. Results from the model showed that while latitude and quarter of the year were important parameters, sea surface temperature had the most significant effect on the pooled intermediate and deep-dive behavior. Model predictions indicated that the largest percentage of potential interaction would occur in the fourth quarter in the region from 18°N-20°N, which corresponds to the time and place of the highest bigeye tuna catch rates by the Hawaii-based long-line fishery. These results suggest that a model framework using these three

  7. Transectional heat transfer in thermoregulating bigeye tuna (Thunnus obesus) - a 2D heat flux model.

    Science.gov (United States)

    Boye, Jess; Musyl, Michael; Brill, Richard; Malte, Hans

    2009-11-01

    We developed a 2D heat flux model to elucidate routes and rates of heat transfer within bigeye tuna Thunnus obesus Lowe 1839 in both steady-state and time-dependent settings. In modeling the former situation, we adjusted the efficiencies of heat conservation in the red and the white muscle so as to make the output of the model agree as closely as possible with observed cross-sectional isotherms. In modeling the latter situation, we applied the heat exchanger efficiencies from the steady-state model to predict the distribution of temperature and heat fluxes in bigeye tuna during their extensive daily vertical excursions. The simulations yielded a close match to the data recorded in free-swimming fish and strongly point to the importance of the heat-producing and heat-conserving properties of the white muscle. The best correspondence between model output and observed data was obtained when the countercurrent heat exchangers in the blood flow pathways to the red and white muscle retained 99% and 96% (respectively) of the heat produced in these tissues. Our model confirms that the ability of bigeye tuna to maintain elevated muscle temperatures during their extensive daily vertical movements depends on their ability to rapidly modulate heating and cooling rates. This study shows that the differential cooling and heating rates could be fully accounted for by a mechanism where blood flow to the swimming muscles is either exclusively through the heat exchangers or completely shunted around them, depending on the ambient temperature relative to the body temperature. Our results therefore strongly suggest that such a mechanism is involved in the extensive physiological thermoregulatory abilities of endothermic bigeye tuna.

  8. New Record of Pseudocycnus appendiculatus Heller, 1868 Parasites of Yellowfin Tuna Thunnus albacares (Bonnaterre, 1788 in the Andaman Sea, Thailand

    Directory of Open Access Journals (Sweden)

    Watchariya PURIVIROJKUL

    2011-01-01

    Full Text Available Four samples of yellowfin tuna, Thunnus albacares (Bonnaterre, 1788, were collected from the Andaman Sea in the Exclusive Economic Zone, Thailand in May 2010. All samples were infested by the parasitic copepod Pseudocycnus appendiculatus at their gill filaments. This report documents a new record of the Andaman Sea, Thailand for P. appendiculatus and also a new host, T. albacares, for this apparent parasite in Thailand is recorded.

  9. Immune reactivity in early life stages of sea-cage cultured Pacific bluefin tuna naturally infected with blood flukes from genus Cardicola (Trematoda: Aporocotylidae).

    Science.gov (United States)

    Pennacchi, Ylenia; Shirakashi, Sho; Nowak, Barbara F; Bridle, Andrew R

    2016-11-01

    Pacific bluefin tuna (PBT), Thunnus orientalis, due to its high average price on the market is an economically valuable fish species. Infections by blood flukes from the genus Cardicola (Trematoda: Aporocotylidae) represent a growing concern for the cage culture of bluefin tuna in Japan, Australia and Southern Europe. The accumulation of numerous Cardicola eggs in the fish gills causes severe pathology that has been linked to mortality in PBT juveniles up to one year old. The only effective treatment used to mitigate the infection is the oral administration of the antihelminthic drug praziquantel (PZQ) to the affected fish. However, with the need to minimise therapeutic drug use in aquaculture it is hoped that immunoprophylaxis can provide a future alternative to protect the PBT juveniles against Cardicola infection. Currently, little is known of the host immune response to these parasites and of their infection dynamics. In this study, using real-time qPCR we aimed to quantitatively detect C. orientalis and C. opisthorchis DNA within the gills and heart of cultured PBT juveniles and to investigate the host immune response at the transcriptional level in the gills. The research focused mainly during early stages of infection soon after young PBT were transferred to culture cages (from 14 to 77 days post-transfer). An increase (up to 11-fold) of immune-related genes, namely IgM, MHC-I, TCR-β and IL-1β was observed in the PBT gills infected with Cardicola spp. (28-77 days post-transfer). Furthermore, IgM (19-fold increase) and MHC-I (11.5-fold increase) transcription was strongly up-regulated in gill samples of PBT infected with C. orientalis relative to uninfected fish but not in fish infected with C. opisthorchis. Cardicola-specific DNA was first detected in the host 14 days post-transfer (DPT) to sea-cages which was 55 days earlier than the first detection of parasite eggs and adults by microscopy. Oral administration of PZQ did not have an immediate effect

  10. Into the deep blue sea: Commons theory and international governance of Atlantic Bluefin Tuna

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    Graham Epstein

    2014-08-01

    Full Text Available The need to understand how to sustainably govern oceanic fisheries has become increasingly urgent as their contribution to global food security and livelihoods are threatened by declining stocks. Atlantic Bluefin Tuna (ABFT is a prominent example of the complexities associated with widely distributed oceanic resources, extending in this case to include much of the North-Atlantic and Mediterranean Sea. This distribution has led to limited attention from commons theorists that tend to focus on small-scale social ecological systems. Therefore in order to explore the fit between theories of the commons developed in small-scale systems, we apply the Social-Ecological Systems Meta-Analysis Database (SESMAD to systematically analyze ABFT governance over a 22 year period. The results, which focus on the effects of resource characteristics, broadly correspond to the expectations of commons theory. Interestingly, however, the addition of resource storage in the form of ABFT ranches appears to be contributing to unsustainable harvests. This stands in contrast to previous findings in the commons literature that storage tends to enhance prospects for sustainable governance. Therefore several alternative hypotheses are developed by comparing and contrasting attributes of ABFT and canal irrigation storage. These hypotheses may be used in future research to evaluate the conditions in which storage enhances prospects for sustainable governance.

  11. Evaluation of three harvest control rules for Bigeye Tuna ( Thunnus obesus) fisheries in the Indian Ocean

    Science.gov (United States)

    Tong, Yuhe; Chen, Xinjun; Kolody, Dale

    2014-10-01

    The stock of Bigeye tuna ( Thunnus obesus) in the Indian Ocean supports an important international fishery and is considered to be fully exploited. The responsible management agency, the Indian Ocean Tuna Commission (IOTC), does not have an explicit management decision-making framework in place to prevent over-fishing. In this study, we evaluated three harvest control rules, i) constant fishing mortality (CF), from 0.2 to 0.6, ii) constant catch (CC), from 60000 to 140000 t, and iii) constant escapement (CE), from 0.3 to 0.7. The population dynamics simulated by the operating model was based on the most recent stock assessment using Stock Synthesis version III (SS3). Three simulation scenarios (low, medium and high productivity) were designed to cover possible uncertainty in the stock assessment and biological parameters. Performances of three harvest control rules were compared on the basis of three management objectives (over 3, 10 and 25 years): i) the probability of maintaining spawning stock biomass above a level that can sustain maximum sustainable yield (MSY) on average, ii) the probability of achieving average catches between 0.8 MSY and 1.0 MSY, and iii) inter-annual variability in catches. The constant escapement strategy ( CE=0.5), constant fishing mortality strategy ( F=0.4) and constant catch ( CC=80000) were the most rational among the respective management scenarios. It is concluded that the short-term annual catch is suggested at 80000 t, and the potential total allowable catch for a stable yield could be set at 120000 t once the stock had recovered successfully. All the strategies considered in this study to achieve a `tolerable' balance between resource conservation and utilization have been based around the management objectives of the IOTC.

  12. CHARACTERISTICS OF GELATIN FROM SWIM BLADDER OF YELLOWFIN TUNA (THUNNUS ALBACORES AS INFLUENCED BY EXTRACTING TEMPERATURES

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    O. Kaewdang

    2015-09-01

    Full Text Available Gelatin was extracted from the swim bladder of yellowfin tuna (Thunnus albacores at different temperatures (60, 70 and 80°C with the extraction yields of 35.6%, 41.1% and 47.3% (dryweight basis, respectively. The α-chains of gelatin decreased with increasing extraction temperatures.Similar amino acid compositions were noticeable among all gelatins, in which glycine constituted the major amino acid. Imino acids ranged from 169 to 172 residues/1,000 residues. Thegel strength of gelatin extracted at lower temperature was higher than that of gelatins extracted at higher temperatures. Gelling and melting temperatures for swim bladder gelatin were 11.07-15.24 and 20.36-22.33°C, respectively. Higher gelling and melting points were observed for gelatin extracted at lower temperatures. Microstructure of gel of gelatin extracted at 60°C was finerwith smaller voids, compared with others. FTIR spectra of obtained gelatins revealed the significant loss of molecular order of the triple-helix. Thus, extraction temperatures showed the directimpact on characteristics of gelatin from swim bladder.

  13. Effect of Temperature on Isolation and Characterization of Hydroxyapatite from Tuna (Thunnus obesus Bone

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    Jayachandran Venkatesan

    2010-10-01

    Full Text Available The effect of temperature on isolation and characterization of hydroxyapatite (HAp from tuna bone was evaluated at different temperatures ranging from 200 °C to 1200 °C. The calcined bones were characterized by thermo gravimetric analysis (TGA, Fourier transform infrared spectroscopy (FTIR, X-ray diffraction (XRD, field emission scanning electron microscopy (FE-SEM, energy dispersive X-ray spectroscopy (EDX and cytotoxicity assay. The FTIR and TGA results revealed the presence of inorganic and organic matrices in raw bone and a preserved carbonated group in the derived HAp. The XRD results of the derived HAp were coherent with the Joint Committee on Powder Diffraction Standards (JCPDS-09-0432/1996 data. In addition, FE-SEM results revealed the formation of nanostructured HAp (80–300 nm at 600 °C and crystal agglomeration was observed with an increase in temperature. The calcium to phosphorous weight ratio was determined by EDX results of treated bones. Derived HAp with various crystal sizes had no cytotoxicity on the MG 63 cell line. Based on the analysis, we conclude that varying the isolation temperature between 600–900 °C has tremendous impact on the production of HAp from Thunnus obesus with required properties.

  14. Reproductive Biology of Albacore Tuna (Thunnus alalunga) in the Western Indian Ocean

    Science.gov (United States)

    Dhurmeea, Zahirah; Zudaire, Iker; Chassot, Emmanuel; Cedras, Maria; Nikolic, Natacha; Bourjea, Jérôme; West, Wendy; Appadoo, Chandani

    2016-01-01

    The reproductive biology of albacore tuna, Thunnus alalunga, in the western Indian Ocean was examined through analysis of the sex ratio, spawning season, length-at-maturity (L50), spawning frequency and fecundity. From 2013 to 2015, a total of 923 female and 867 male albacore were sampled. A bias in sex ratio was found in favor of females with fork length (LF) reproduction through their longer spawning period compared to small individuals. The L50 (mean ± standard error) of female albacore was estimated at 85.3 ± 0.7 cm LF. Albacore spawn on average every 2.2 days within the spawning region and spawning months, from November to January. Batch fecundity ranged between 0.26 and 2.09 million oocytes and the relative batch fecundity (mean ± standard deviation) was estimated at 53.4 ± 23.2 oocytes g-1 of somatic-gutted weight. The study provides new information on the reproductive development and classification of albacore in the western Indian Ocean. The reproductive parameters will reduce uncertainty in current stock assessment models which will eventually assist the fishery to be sustainable for future generations. PMID:28002431

  15. Carbon monoxide residues in vacuum-packed yellowfin tuna loins (Thunnus Albacares

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    Raffaele Marrone

    2015-09-01

    Full Text Available The use of carbon monoxide (CO in fresh fish has generated considerable debate. Carbon monoxide is used to treat fresh fish in order to retain its fresh red appearance for a longer period. It reacts with the oxy-myoglobin to form a fairly stable cherry red carboxy-myoglobin complex that may mask spoilage, because the CO-complex can be stable beyond the microbiological shelf life of the meat. The presence of CO in tuna fish (Thunnus Albacares has been investigated by means of optical spectroscopy. Formation of the CO adduct can be easily detected by the combined analysis of electronic absorption spectra in their normal and second derivative modes, monitoring the intense Soret band at 420 nm. Samples were judged as CO treated when their levels were higher than 200 ng/g. Only two positive samples out of 29 analyzed were detected. The high level of uncertainty (0.30 of the method requires the use of more specific and sensitive methods for confirmatory analysis.

  16. Carbon Monoxide Residues in Vacuum-Packed Yellowfin Tuna Loins (Thunnus Albacares)

    Science.gov (United States)

    Mascolo, Celestina; Palma, Giuseppe; Smaldone, Giorgio; Girasole, Mariagrazia; Anastasio, Aniello

    2015-01-01

    The use of carbon monoxide (CO) in fresh fish has generated considerable debate. Carbon monoxide is used to treat fresh fish in order to retain its fresh red appearance for a longer period. It reacts with the oxy-myoglobin to form a fairly stable cherry red carboxy-myoglobin complex that may mask spoilage, because the CO-complex can be stable beyond the microbiological shelf life of the meat. The presence of CO in tuna fish (Thunnus Albacares) has been investigated by means of optical spectroscopy. Formation of the CO adduct can be easily detected by the combined analysis of electronic absorption spectra in their normal and second derivative modes, monitoring the intense Soret band at 420 nm. Samples were judged as CO treated when their levels were higher than 200 ng/g. Only two positive samples out of 29 analyzed were detected. The high level of uncertainty (0.30) of the method requires the use of more specific and sensitive methods for confirmatory analysis. PMID:27800404

  17. Reproductive biology of female bigeye tuna Thunnus obesus in the western Pacific Ocean.

    Science.gov (United States)

    Sun, C L; Yeh, S Z; Chang, Y J; Chang, H Y; Chu, S L

    2013-08-01

    The reproductive biology of female bigeye tuna Thunnus obesus was assessed by examining 888 fish (ranging from 84·9 to 174·4 cm fork length, LF ) caught by Taiwanese offshore longliners in the western Pacific Ocean from November 1997 to November 1998 and November to December 1999 and 258 gonad samples from these fish. The overall sex ratio of the catch during the sampling differed significantly from 0·5, but males were predominant in sizes >140 cm LF . Reproductive activity (assessed by histology), a gonado-somatic index, and the size-frequency distributions of whole oocytes indicated that spawning occurred throughout the year and the major spawning season appeared to be from February to September. The estimated sizes at 50% maturity (LF50 ) of females was 102·85 cm (95% c.i.: 90·79-110·21 cm) and the smallest mature female was 99·7 cm LF . They are multiple spawners and oocytes develop asynchronously. The proportion of mature (0·63) and reproductively active (0·70) females with ovaries containing postovulatory follicles indicated that they spawn almost daily. Batch fecundity for 15 females with the most advanced oocytes (>730 µm) ranged from 0·84 to 8·56 million eggs (mean ± s.d. = 3·06 ± 2·09). The relationships between batch fecundity (FB , in millions of eggs) and LF (cm) and round mass (MR , kg) were FB=9·91×10-14LF6·38 (r(2)  = 0·84) and FB=8·89×10-4MR2·05 (r(2)  = 0·80), respectively. The parameters estimated in this study are key information for stock assessments of T. obesus in the western Pacific Ocean and will contribute to the conservation and sustainable yield of this species.

  18. Vertical behavior and diet of albacore tuna (Thunnus alalunga) vary with latitude in the South Pacific Ocean

    Science.gov (United States)

    Williams, Ashley J.; Allain, Valerie; Nicol, Simon J.; Evans, Karen J.; Hoyle, Simon D.; Dupoux, Cyndie; Vourey, Elodie; Dubosc, Jeff

    2015-03-01

    Albacore tuna (Thunnus alalunga) are an important upper tropic-level oceanic predator with a circum-global distribution. Little is known of the movements and diet of albacore tuna in the South Pacific Ocean and how variability in both might influence the vulnerability of albacore tuna to fisheries across their range. We coupled data derived from satellite-tagged albacore tuna with stomach samples collected from individuals at the same locations to characterize the vertical behavior, thermal and dietary habits of albacore tuna at tropical (New Caledonia and Tonga) and temperate (New Zealand) latitudes. A total of 18 pop-up satellite archival tags deployed on albacore tuna remained attached for 0-50 days. Position estimates, calculated from 11 tags, described short-term movements of predominantly less than 500 km, although one fish moved more than 1000 km over a period of 50 days. Vertical behavior and diet differed substantially between tropical and temperate latitudes. At tropical latitudes, albacore tuna showed a distinct diel pattern in vertical habitat use, occupying shallower, warmer waters above the mixed layer depth (MLD) at night, and deeper, cooler waters below the MLD during the day. In contrast, there was little evidence of a diel pattern of vertical behavior in albacore tuna at temperate latitudes, with fish limited to shallow waters above the MLD almost all of the time. Spatial patterns of species composition in stomach contents were consistent with vertical movement patterns, with significantly more deepwater prey species consumed in tropical waters than in temperate waters. Albacore in tropical waters also consumed significantly greater diversities of prey than in temperate waters, predominately preying on fish species, whereas those in temperate waters predominately preyed on crustacea. Our results indicate that the vertical distribution of albacore is constrained either by thermal preferences with diet reflecting these preferences, by the vertical

  19. Physicochemical evaluation of the effects of irradiation and evisceration on the conservation of refrigerated blackfin tuna (Thunnus atlanticus)

    Energy Technology Data Exchange (ETDEWEB)

    Monteiro, Maria L.G.; Marsico, Eliane T. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Faculdade de Veterinaria. Dept. de Tecnologia de Alimentos], e-mail: marialuciaguerra@yahoo.com.br, e-mail: elianee@vm.uff.br; Vital, Helio C. [Centro Tecnologico do Exercito (CTEx), Rio de Janeiro, RJ (Brazil). Secao de Defesa Nuclear], e-mail: vital@ctex.eb.br

    2009-07-01

    Tuna is among the most traded fishes in Brazil, however efficiently delaying its fast deterioration is still a major practical challenge. Irradiation has been proposed as a safe and powerful alternative tool for conservation of seafood. This work investigated the effects of irradiation on the physicochemical quality of refrigerated blackfin tuna (Thunnus atlanticus). Analyses of pH, total volatile bases (TVB-N), ammonia and biogenic amines (histamine, cadaverine and putrescine) were performed in order to determine the degree of conservation. The samples were subjected to four different treatments aiming at evaluating the efficiency of irradiation, evisceration and both combined. The figures measured for those parameters, all of them related to the degree of conservation, were found to increase with time regardless of the treatment. In addition, data for irradiated samples remained consistently lower than for unirradiated ones, indicating a better level of preservation that led to an extended shelf life of 14 days. In contrast, excessive levels of those indicators of degradation were found in unirradiated samples after 7 to 10 days of storage. In addition, some evidence was found that evisceration slightly increased quality, consequently promoting a small extension in shelf life of unirradiated samples. Finally, it can be concluded with basis on the results of the physicochemical parameters studied that treatment of fresh refrigerated blackfin tuna by irradiation with 2.5 kGy efficiently preserved freshness and extended the shelf life of the product from 7 to 14 days. (author)

  20. SEBARAN DAN HUBUNGAN PARAMETER REPRODUKSI IKAN TUNA MADIDIHANG (Thunnus albacares DENGAN SUHU DAN KLOROFIL-a DI LAUT BANDA

    Directory of Open Access Journals (Sweden)

    Karsono Wagiyo

    2015-12-01

    Full Text Available Laut Banda diketahui mempunyai kondisi lingkungan yangmendukung sebagai daerah pemijahan ikan tuna madidihang (Thunnus albacares. Sebaran parameter reproduksi dan hubungannya dengan lingkungan perlu diketahui sebagai dasar pengelolaan sumberdaya yang lestari. Penelitian dilakukan tahun 2011-2012 dengan basis pendataan di Bandaneira. Pengamatan parameter reproduksi dilakukan terhadap ikan sampel melalui observasi dan enumerasi. Suhu dan klorofil-a diperoleh = dari analisis citra satelit. Penelitian mendapatkan persentase gonad matang (100 % dan indeks kematangan gonad tertinggi (3,75 serta nisbah kelamin seimbang, secara temporal ditemukan pada bulan antara September-Desember, secara spasial ditemukan di Perairan Gunung Api dan Selatan Kepulauan Lease. Tingkat kematangan gonad dan indeks kematangan gonad meningkat terjadi pada saat suhu mulai menghangat dan klorofil-a mulai menurun. Tingkat kematangan gonad dan indeks kematangan gonad menurun terjadi pada saat awal penurunan suhu dan awal kenaikan klorofil-a. Besides known as the Banda Sea region yellowfin tuna migration (Thunnus albacares is also a spawning area. Distribution of Reproduction parameter and their relationship with environmental parameter should be known as the basis for sustainable resource management. The reproduction parameter obtaianed by observation and enumeration. Temperature and chlorophyll-a obtained by satellite image analysis. Research gets a high percentage of the gonads mature (100% and gonad maturity index (3,75 and a balanced sex ratio, temporally be found in the September-December, spatially found in the waters of Pulau Gunung Api and Lease Islands. The maturity level of gonads and gonadal maturation index increases occurred when the temperatures begin to warm and chlorophyll-a start to decline. The maturity level of gonads and gonadal maturation index decreases occurred at the beginning of the early drop in temperature and increase in chlorophyll-a.

  1. Heavy metals in yellowfin tuna (Thunnus albacares) and common dolphinfish (Coryphaena hippurus) landed on the Ecuadorian coast

    Energy Technology Data Exchange (ETDEWEB)

    Araújo, Cristiano V.M., E-mail: cristiano.araujo@icman.csic.es [Central Department of Research (DCI), Ecuadorian Aquatic Ecotoxicology (ECUACTOX) group, Universidad Laica Eloy Alfaro de Manabí - ULEAM, Manta (Ecuador); Centre of Functional Ecology (CFE), Department of Life Sciences, University of Coimbra, Coimbra (Portugal); Cedeño-Macias, Luis A. [Central Department of Research (DCI), Ecuadorian Aquatic Ecotoxicology (ECUACTOX) group, Universidad Laica Eloy Alfaro de Manabí - ULEAM, Manta (Ecuador); Faculty of Marine Sciences, Universidad Laica Eloy Alfaro de Manabí (ULEAM), Manta (Ecuador)

    2016-01-15

    Heavy metals are contaminants of great environmental concern due to their multiple origins (natural and anthropogenic), the ability to accumulate in organs and tissues, and the deleterious effects they can cause in organisms. Studies on the accumulation of metals in seafood, such as fish, have increased in importance due to the risk for human health when consuming fish contaminated by metals. The present work was aimed at verifying the concentrations of cadmium (Cd), mercury (Hg) and lead (Pb) in the muscular tissue and liver of yellowfin tuna (Thunnus albacares) and common dolphinfish (Coryphaena hippurus) from the Eastern Pacific Ocean landed in Manta city, Ecuador. Samples were analyzed by inductively coupled plasma mass spectroscopy (ICP-MS). Around half of the muscle samples of both species presented levels of Cd and Hg above the limits considered safe for human consumption established by the European Union. For Pb, most of the muscle samples were considered acceptable for consumption. Results indicate that both species should be consumed with some caution. Considering the tolerable weekly intake recommended for adults by the World Health Organization, results indicate that Hg is the main metal that limits the consumption of yellowfin tuna and common dolphinfish, with a recommended maximum ingestion, respectively, of 191 and 178 g per week for an adult. - Highlights: • Thunnus albacares and Coryphaena hippurus from Eastern Pacific (Ecuador) were sampled. • Muscle and liver of both species were assessed for Cd, Hg and Pb concentrations. • Levels of Pb were considered acceptable for both species. • High levels of Cd and Hg in both species can be considered unsafe for human health. • For both species the recommended maximum ingestion is around 180 g week{sup −1} for an adult.

  2. Growth and mortality rates of yellowfin tuna, Thunnus albacares (Perciformes: Scombridae, in the eastern and central Pacific Ocean

    Directory of Open Access Journals (Sweden)

    Guoping Zhu

    2011-04-01

    Full Text Available Age and growth parameters were estimated for the yellowfin tuna Thunnus albacares (Bonnaterre, 1788. Atotal of 443 individuals were sampled from China longline fisheries in the eastern and central Pacific Ocean from February to November 2006. The von Bertalanffy growth parameters were estimated at L∞ = 175.9 cm fork length, k = 0.52 year-1, and t0 = 0.19 year. The total mortality rate (Z was estimated to be from 1.19 to 1.93 year-1, the fishing mortality (F and the natural mortality (M were calculated to be 0.91 year-1 and 0.65 year-1, respectively. The rate of exploitation (U was estimated to be 0.46. This study provides estimates of growth and mortality rate for yellowfin tuna in the eastern and central Pacific Ocean, which may be used as biological input parameters in future stock assessments for the oceanic region. However, age analysis with other techniques, additional validation of the size composition and stock structure are also needed.

  3. Mercury accumulation in Yellowfin tuna (Thunnus albacares) with regards to muscle type, muscle position and fish size.

    Science.gov (United States)

    Bosch, Adina C; O'Neill, Bernadette; Sigge, Gunnar O; Kerwath, Sven E; Hoffman, Louwrens C

    2016-01-01

    The concentrations and relationships between individual mercury species and total mercury were investigated in different muscle parts and sizes of Yellowfin tuna (Thunnus albacares). Fourteen Yellowfin tuna caught in the South Atlantic off the coast of South Africa had an average total Hg (tHg) concentration of 0.77 mg/kg wet weight. No differences were detected (p > 0.05) in tHg, MethylHg (MeHg) or inorganic Hg (iHg) accumulation among the four white muscle portions across the carcass, but both tHg and iHg were found in higher concentrations (p < 0.001) in dark muscle than white muscle. Positive linear correlations with fish weight were found for both tHg (r = 0.79, p < 0.001) and MeHg (r = 0.75, p < 0.001) concentrations. A prediction model was formulated to calculate toxic MeHg concentrations from measured tHg concentrations and fish weight (cMeHg = 0.073 + 1.365 · tHg-0.008 · w). As sampling sites and subsampling methods could affect toxicity measurements, we provide recommendations for sampling guidelines.

  4. Heavy metals in yellowfin tuna (Thunnus albacares) and common dolphinfish (Coryphaena hippurus) landed on the Ecuadorian coast.

    Science.gov (United States)

    Araújo, Cristiano V M; Cedeño-Macias, Luis A

    2016-01-15

    Heavy metals are contaminants of great environmental concern due to their multiple origins (natural and anthropogenic), the ability to accumulate in organs and tissues, and the deleterious effects they can cause in organisms. Studies on the accumulation of metals in seafood, such as fish, have increased in importance due to the risk for human health when consuming fish contaminated by metals. The present work was aimed at verifying the concentrations of cadmium (Cd), mercury (Hg) and lead (Pb) in the muscular tissue and liver of yellowfin tuna (Thunnus albacares) and common dolphinfish (Coryphaena hippurus) from the Eastern Pacific Ocean landed in Manta city, Ecuador. Samples were analyzed by inductively coupled plasma mass spectroscopy (ICP-MS). Around half of the muscle samples of both species presented levels of Cd and Hg above the limits considered safe for human consumption established by the European Union. For Pb,most of the muscle samples were considered acceptable for consumption. Results indicate that both species should be consumed with some caution. Considering the tolerable weekly intake recommended for adults by the World Health Organization, results indicate that Hg is the main metal that limits the consumption of yellowfin tuna and common dolphinfish, with a recommended maximum ingestion, respectively, of 191 and 178 g per week for an adult.c

  5. POPULATION STRUCTURE AND BIOREPRODUCTION OF BIGEYE TUNA (Thunnus obesus IN WESTERN PART OF SUMATERA AND SOUTHERN PART OF JAVA AND NUSA TENGGARA, INDIAN OCEAN

    Directory of Open Access Journals (Sweden)

    Ali Suman

    2015-12-01

    Full Text Available Bigeye tuna is an important fish resource in the Indian Ocean. This species like other tuna species needs to be managed properly in both national and international levels. Therefore some data and information on population structure and bioreproduction are required for management purpose. The current research was conducted to identify the population structure and bioreproduction of bigeye tuna (Thunnus obesus in west off Sumatera and south off Java and Nusa Tenggara of Indian Ocean where tuna fishing spots are important. This research was based on catch landed by fishermen from the Indian Ocean during 2010. Analysis of population structure was done using DNA genetic analyses and bioreproduction by using histology technique. Results show that the population structure of the bigeye tuna in the Indian Ocean consisted of two different sub populations namely sub population of west off Sumatra and sub population of south of Java and Nusa Tenggara waters. Most of catch (about 39% was categorized as immature fish (GI I. The immature fish was mostly found in west off Sumatera waters, meanwhile the catch in south off Java and Nusa Tenggara waters was mostly categorized as mature fish. This result may indicate that south off Java and Nusa Tenggara waters is a spawning ground of the bigeye tuna.

  6. Quality assessment of ice-stored tropical yellowfin tuna (Thunnus albacares) and influence of vacuum and modified atmosphere packaging.

    Science.gov (United States)

    Silbande, Adèle; Adenet, Sandra; Smith-Ravin, Juliette; Joffraud, Jean-Jacques; Rochefort, Katia; Leroi, Françoise

    2016-12-01

    Metagenomic, microbial, chemical and sensory analyses of Thunnus albacares from Martinique stored in ice (AIR - 0 °C), vacuum (VP - 4/8 °C) and modified atmosphere packaging (MAP - 4/8 °C) (70% CO2 - 30% O2) were carried out. The organoleptic rejection of AIR tuna was observed at day 13 when total bacterial counts equaled 10(6)-10(7) CFU g(-1). No extension of shelf-life was provided by VP and MAP. According to 16S rRNA gene sequence analyzed by Illumina MiSeq and PCR-TTGE, Rhodanobacter terrae was the main species of the freshly caught tuna. At the sensory rejection time, Brochothrix thermosphacta and Pseudomonas dominated the AIR products while B. thermosphacta alone or a mix of B. thermosphacta, Enterobacteriaceae and lactic acid bacteria (LAB) dominated the microbiota of MAP and VP products, respectively. The pH value remained stable in all trials, ranging from 5.77 to 5.97. Total volatile basic nitrogen (TVBN) and trimethylamine (TMA-N) concentrations were weak and not significantly different between batches. Lipid oxidation increased in the samples containing O2 (MAP > AIR). The initial concentration of histamine was high (75-78 mg kg(-1)) and stable up to 8 days but then significantly decreased in all trials to reach 25-30 mg kg(-1), probably due to the presence of histamine-decomposing bacteria.

  7. Histamine formation and the freshness of yellowfin tuna (Thunnus albacares) stored at different temperatures

    OpenAIRE

    B.K.K.K. Jinadasa; C.K. Galhena; N.P.P. Liyanage

    2015-01-01

    This study was conducted to investigate the effect of storage temperatures on the shelf life of yellowfin tuna (YFT) loins by studying of microbial, chemical and organoleptic changes. Shelf life of YFT was determined through changes in total aerobic bacterial plate counts (APC), total volatile basic nitrogen (TVB-N) trimethylamine (TMA), organoleptic properties and histamine development during storage at 0, 4 and 7°C. Based on TVB-N value indices, YFT maintained an acceptable shelf life for 2...

  8. Shifting from marine reserves to maritime zoning for conservation of Pacific bigeye tuna (Thunnus obesus).

    Science.gov (United States)

    Sibert, John; Senina, Inna; Lehodey, Patrick; Hampton, John

    2012-10-30

    Over 50% of the total bigeye tuna (BET) landed in the Western Central Pacific Ocean is caught incidentally in the purse seine fishery and sold for canning at prices less than US$2/kg. The remainder is landed in longline fisheries directed at BET and sold as fresh or frozen tuna at prices greater than US$10/kg. The combined fishing mortality by all gears will soon reduce the BET biomass in the Pacific Ocean to less than that capable of producing maximum sustainable yield. Closure of the high-seas enclaves in 2009 was hailed as a conservation measure, but was not scientifically evaluated before implementation and appears to have had no beneficial effect on the BET stock. A spatially explicit age-structured ecosystem model, SEAPODYM, is used to simulate alternative area-based fishery management policies to conserve bigeye tuna in the Western Central Pacific Ocean. Closing the high-seas enclaves to purse seine fishing has negligible effect on the BET biomass. Fishery management policies that control mortality on both juveniles and adults, through prohibition of fish aggregation devices in the purse seine fishery and restrictions on longline fishing in spawning areas, are the most efficient conservation policies. Large-scale benefits from bigeye conservation measures will become apparent only in the 2030s, assuming timely implementation and minimal effects of climate change.

  9. Modelling the Effects of Radioactive Effluent on Thunnus orientalis and Oncorhynchus gorbuscha

    Directory of Open Access Journals (Sweden)

    Zhixiong Chen

    2013-01-01

    Full Text Available The contamination of the Pacific Ocean by the radioactive pollutants released from the Fukushima Daiichi Nuclear Power Plant has raised legitimate concerns over the viability of marine wildlife. We develop a modified Crank-Nicholson method to approximate a solution to the diffusion-advection-decay equation in time and three spatial dimensions to explore the extent of the effects of the radioactive effluent on two marine species: the Pacific Bluefin Tuna (Thunnus orientalis and the Pacific Pink Salmon (Oncorhynchus gorbuscha.

  10. Infection of Anisakids Larvae in Long Tail Tuna (Thunnus tonggol In North Persian Gulf

    Directory of Open Access Journals (Sweden)

    A Eslami

    2011-09-01

    Full Text Available Background: The aim of this paper was to study the prevalence and intensity of Anisakids lar­vae in the long tail tuna fish captured from Iranian shores of Persian Gulf.Methods: Different organs including skin, abdominal cavity, stomach and intestinal contents, stom­ach sub serous tissues, liver, spleen, gonads and 20 grams of muscles of 100 long tail tuna fish (Thannus tonggol caught from waters of the north parts of Persian Gulf were searched for anisakid nematodes larvae. Twenty grams of around the body cavity muscles were digested in artificial gastric juice. Different organs and digested muscles were examined with naked eyes for the presence of anisakids larvae. The collected larvae were preserved in 70% alcohol containing 5% glycerin, and cleared in lactophenol for identification.Results: Our findings revealed that 89% of fish harbored 3rd stage larvae of Anisakis sp. of which 2% were infected with both Anisakis and Raphidascaris. All inspected organs except that of skin were found to be infected, while stomach sub serous tissues were the most infected organ (80% followed by abdominal cavity (10%, liver (4%, testicle (3%, stomach contents and spleen (2% and intestinal contents (1%. Intestine and abdominal cavity were the organs har­bored Raphidascaris sp. Digested muscles were free of parasite. Mean intensity was low for both spe­cies and ranged between 1.5 for Raphidascaris sp. and 3.67 for Anisaki sp.Conclusion: Anisakids larvae especially Anisakis are very prevalent in some fish including tunas of Persian Gulf, and consumption of infected fish if it is not properly cooked may lead to human anisakiasis.

  11. Biomagnification of mercury and its antagonistic interaction with selenium in yellowfin tuna Thunnus albacares in the trophic web of Baja California Sur, Mexico.

    Science.gov (United States)

    Ordiano-Flores, Alfredo; Rosíles-Martínez, Rene; Galván-Magaña, Felipe

    2012-12-01

    Mercury and selenium concentrations were determined in muscle of 37 yellowfin tuna (Thunnus albacares) captured aboard of Mexican purse-seiners boats off western coast of Baja California Sur, between Punta Eugenia and Cabo Falso, from October to December 2006. Also, its prey (mainly, jumbo squid Dosidicus gigas and pelagic red crab Pleuroncodes planipes) were analyzed from the stomach contents. All the mercury values obtained were lower that mercury content recommended by standard legal limits for seafood adopted by Mexican norms (typically 0.5-1.0μg g(-1)). Mercury concentrations vary between 0.06 and 0.51μg g(-1) in yellowfin tuna, and from 0.01 to 0.20μg g(-1) in its prey, suggesting that mercury can accumulate in prey tissues and that of their predator. Biomagnification factors (BMF) between predator-prey associations were calculated. The BMFs were >1, indicating that mercury biomagnifies along the food web of yellowfin tuna. In all species studied there was a molar excess of selenium over mercury. The rank order of mean selenium/mercury molar ratios was for pufferfish (42.62)> diamond squid (15.09)>yellowfin tuna (10.29)>pelagic red crab (10.05)>panama lightfish (9.54)> jumbo squid (8.91). The selenium health benefit value (Se-HBV) was calculated to have an improved understanding of the health benefits and risk of fish consumption.

  12. Genetic structuring and migration patterns of Atlantic bigeye tuna, Thunnus obesus (Lowe, 1839

    Directory of Open Access Journals (Sweden)

    Beerli Peter

    2008-09-01

    Full Text Available Abstract Background Large pelagic fishes are generally thought to have little population genetic structuring based on their cosmopolitan distribution, large population sizes and high dispersal capacities. However, gene flow can be influenced by ecological (e.g. homing behaviour and physical (e.g. present-day ocean currents, past changes in sea temperature and levels factors. In this regard, Atlantic bigeye tuna shows an interesting genetic structuring pattern with two highly divergent mitochondrial clades (Clades I and II, which are assumed to have been originated during the last Pleistocene glacial maxima. We assess genetic structure patterns of Atlantic bigeye tuna at the nuclear level, and compare them with mitochondrial evidence. Results We examined allele size variation of nine microsatellite loci in 380 individuals from the Gulf of Guinea, Canary, Azores, Canada, Indian Ocean, and Pacific Ocean. To investigate temporal stability of genetic structure, three Atlantic Ocean sites were re-sampled a second year. Hierarchical AMOVA tests, RST pairwise comparisons, isolation by distance (Mantel tests, Bayesian clustering analyses, and coalescence-based migration rate inferences supported unrestricted gene flow within the Atlantic Ocean at the nuclear level, and therefore interbreeding between individuals belonging to both mitochondrial clades. Moreover, departures from HWE in several loci were inferred for the samples of Guinea, and attributed to a Wahlund effect supporting the role of this region as a spawning and nursery area. Our microsatellite data supported a single worldwide panmictic unit for bigeye tunas. Despite the strong Agulhas Current, immigration rates seem to be higher from the Atlantic Ocean into the Indo-Pacific Ocean, but the actual number of individuals moving per generation is relatively low compared to the large population sizes inhabiting each ocean basin. Conclusion Lack of congruence between mt and nuclear evidences, which

  13. Histamine formation and the freshness of yellowfin tuna (Thunnus albacares stored at different temperatures

    Directory of Open Access Journals (Sweden)

    B.K.K.K. Jinadasa

    2015-12-01

    Full Text Available This study was conducted to investigate the effect of storage temperatures on the shelf life of yellowfin tuna (YFT loins by studying of microbial, chemical and organoleptic changes. Shelf life of YFT was determined through changes in total aerobic bacterial plate counts (APC, total volatile basic nitrogen (TVB-N trimethylamine (TMA, organoleptic properties and histamine development during storage at 0, 4 and 7°C. Based on TVB-N value indices, YFT maintained an acceptable shelf life for 21, 17 and 12 days at 0, 4 and 7°C, respectively. Nevertheless, YFT was rejected earlier by the sensory panellists than their TVB-N value indicated. Histamine development was found to be lower than the European Union safety level for 100 mg/kg fish during storage at 0 and 7°C for 21 and 17 days, respectively. Aerobic bacteria initially dominated the micro-flora on YFT; however, as storage time increased, aerobic bacteria became dominant at cold storage, but the numbers exceeded the International Commission on Microbiological Specifications for Foods (ICMSF limit of 107 cfu/g in storage at 7°C after 17 days. Therefore, it can be concluded that the storage of fresh YFT in below 4°C has good enough to the shelf life of products (two weeks.

  14. VARIASI GENETIK IKAN TUNA SIRIP KUNING, Thunnus albacares DENGAN ANALISIS ELEKTROFORESIS ALLOZYME DAN Mt-DNA

    Directory of Open Access Journals (Sweden)

    Gusti Ngurah Permana

    2007-04-01

    Full Text Available Sampel ikan tuna sirip kuning, T. albacares diambil dari tiga lokasi (perairan Bali, Sulawesi Utara, dan Maluku Utara dan dilakukan analisis variasi genetik dengan metode elektroforesis allozyme menggunakan 15 enzim dan mt-DNA dengan 4 enzim restriksi. Hasil penelitian ini diperoleh 4 lokus enzim polimorfik yaitu: Idh-*2 (isocitrate dehydrogenase, Gpi-2* (glucose phoshate dehydrogenase , Mdh-1* (malat e dehydrogenase, dan Est-1* (esterase. Frekuensi alel allozyme terlihat adanya perbedaan yang nyata (Fst = 0,12; P<0,05 antar lokasi yaitu Bali (A, B, C, D, Sulawesi Utara dan Maluku Utara (A, B, C. 15 komposit haplotipe ditemukan pada populasi Bali, Sulawesi Utara, dan Maluku Utara. Haplotype diversity pada populasi Bali 0,886; Sulawesi Utara 0,790; dan Maluku Utara 0,785; dengan rata-rata dari haplotype diversity adalah 0,857. Jarak genetik dari ketiga populasi berkisar antara 0,003--0,023 (rata-rata 0,016. Populasi Maluku Utara dan Sulawesi Utara mempunyai jarak genetik terdekat yaitu 0,003. Hal ini merupakan indikator bahwa Sulawesi Utara dan Maluku Utara sering digunakan sebagai jalur migrasi dengan adanya kesamaan alel yang ditemukan pada kedua populasi tesebut, jika dibandingkan dengan populasi Bali (0,023.

  15. Forage fauna in the diet of bigeye tuna (Thunnus obesus in the western tropical Atlantic Ocean

    Directory of Open Access Journals (Sweden)

    Teodoro Vaske Júnior

    2012-03-01

    Full Text Available A total of 291 stomachs of bigeye tuna caught in the Western tropical Atlantic Ocean ranging between 60 and 195 cm fork length, were analyzed between October 2004 and November 2005. The vertical distribution of prey was studied in relation to their feeding strategies. A total of 83 prey items were identified of which 46 were fishes, represented mainly by brephoepipelagic, and meso-bathypelagic fishes; 20 cephalopods, 13 pelagic crustaceans, one tunicate, one heteropod and one pteropod. The Caribbean pomfret Brama caribbea was the most important food item, followed by other mesopelagic fishes such as Alepisaurus ferox, Omosudis lowei, Gempylus serpens, Brama brama and Diretmus argenteus. The squid Ornithoteuthis antillarum was the main preyed-on cephalopod, and the crustaceans Caridea and Brachyuran megalopae were also important food items. The feeding may occur continuously, all the time, or at least during the greater part of the day or night, as part of the feeding strategy to prey upon a vertically scattered small prey distributed in the water column. The relative equality in the proportions of surface, mid-water and deep-water prey organisms reflects the behavior of constant vertical displacement in the search for prey. Although the bigeye tuna prefers subthermocline layers, most of its prey items perform diel migrations and can be preyed on both near the surface and in deeper waters.Um total de 291 estômagos de albacoras-bandolins capturadas no oceano Atlântico tropical oeste variando entre 60 e 195 cm de comprimento furcal, foram analisados entre outubro de 2004 e dezembro de 2005. A distribuição vertical das presas foi estudada em relação às estratégias alimentares. Um total de 83 itens alimentares foi identificado dos quais 46 foram peixes representados principalmente por peixes brefoepipelágicos e mesopelágicos, 20 cefalópodes, 13 crustáceos pelágicos, um tunicado, um heterópode e um pterópode. A palombeta

  16. Consequences of the historical demography on the global population structure of two highly migratory cosmopolitan marine fishes: the yellowfin tuna (Thunnus albacares and the skipjack tuna (Katsuwonus pelamis

    Directory of Open Access Journals (Sweden)

    Covello Kelly

    2005-02-01

    Full Text Available Abstract Background Yellowfin and skipjack tuna are globally distributed in the world's tropical and sub-tropical oceans. Since little, if any, migration of these fishes occurs between the Atlantic and Indo-Pacific Oceans, one might expect to see genetic differences between sub-populations in these ocean basins. However, yellowfin and skipjack tuna have extremely large population sizes. Thus, the rate of genetic drift should be slower than that observed for other tunas. Results Low levels of genetic differentiation were observed between Atlantic and Pacific samples of yellowfin tuna. In contrast, no genetic differentiation was observed between Atlantic and Pacific samples of skipjack tuna. Conclusion Much lower levels of genetic differentiation were found among sub-populations of yellowfin tuna compared to those observed for other large tunas, probably due to the large population size of yellowfin tuna. Since skipjack tuna appear to have even larger population sizes, it is not surprising that no genetic differentiation was detected between Atlantic and Pacific samples of these fish.

  17. Endogenous level of acetic acid in yellowfin tuna (Thunnus albacares): a pilot study about a possible controversy on its residue nature.

    Science.gov (United States)

    Chiesa, Luca Maria; Pasquale, Elisa; Panseri, Sara; Britti, Domenico; Malandra, Renato; Villa, Roberto; Arioli, Francesco

    2017-03-01

    A method based on headspace solid-phase microextraction (HS-SPME) followed by GC-MS analysis was developed for the determination of underivatised acetic acid in fresh tuna fish muscle. Parameters such as the fibre selected and the extraction time and temperature were optimised and the linearity, detection limits and precision of the whole analytical procedure were assessed. The method was then applied to determine the acetic acid concentration in fresh yellowfin tuna muscles (Thunnus albacares) in order to evaluate the endogenous level and its variations during the shelf life under different storage conditions. A qualitative comparison was also made with variations in histamine levels to evaluate the possibility of the joint monitoring of acetic acid and histamine to identify fish stored in poor conditions. The caudal area always had a lower content of acetic acid than the ventral area, independent of the storage time and temperature. A difference was found between the 6- and 3-day time points and day 0 at a storage temperature of 8°C and between the 6-day time point and day 0 at a storage temperature of 0°C, independent of the anatomical area of the sampled tissue. The evaluation of acetic acid could represent an important approach in the field of food safety to detect the illicit use of acetic acid as an antibacterial preservative treatment or to eliminate the unpleasant smell of trimethylamine.

  18. DRY SALTED AND SMOKED TUNA PRODUCTS. CHEMICAL, RHEOLOGICAL AND NUTRITIONAL CHARACTERISTICS

    Directory of Open Access Journals (Sweden)

    R. Mercogliano

    2013-02-01

    Full Text Available Since the presence of bluefin tuna (Thunnus thynnus is limited to some fishing areas and the species undergoes a high fishing pressure the commercial answers to this situation might be the diversification of the commercial offer. The commercial value of this species, especially in oriental market, has prompted researches aiming at fully exploiting the potential of this species through the production of innovative tuna based products. Sliceable dry salted and smoked tuna products were manufactured using whole muscles from fresh and frozen subjects. The shelf life was long enough to justify the industrial production (up to 3 months or more. No significant correlations were observed between sensory characteristics and physico-chemical parameters.

  19. Trophic Ecology of Atlantic Bluefin Tuna (Thunnusthynnus) Larvae from the Gulf of Mexico and NW Mediterranean Spawning Grounds: A Comparative Stable Isotope Study

    Science.gov (United States)

    Malca, Estrella; Quintanilla, José María; Muhling, Barbara A.; Alemany, Francisco; Privoznik, Sarah L.; Shiroza, Akihiro; Lamkin, John T.; García, Alberto

    2015-01-01

    The present study uses stable isotopes of nitrogen and carbon (δ15Nandδ13C) as trophic indicators for Atlantic bluefin tuna larvae (BFT) (6–10 mm standard length) in the highly contrasting environmental conditions of the Gulf of Mexico (GOM) and the Balearic Sea (MED). These regions are differentiated by their temperature regime and relative productivity, with the GOM being significantly warmer and more productive. MED BFT larvae showed the highest δ15N signatures, implying an elevated trophic position above the underlying microzooplankton baseline. Ontogenetic dietary shifts were observed in the BFT larvae from the GOM and MED which indicates early life trophodynamics differences between these spawning habitats. Significant trophic differences between the GOM and MED larvae were observed in relation to δ15N signatures in favour of the MED larvae, which may have important implications in their growth during their early life stages.These low δ15N levels in the zooplankton from the GOM may be an indication of a shifting isotopic baseline in pelagic food webs due to diatrophic inputs by cyanobacteria. Lack of enrichment for δ15N in BFT larvae compared to zooplankton implies an alternative grazing pathway from the traditional food chain of phytoplankton—zooplankton—larval fish. Results provide insight for a comparative characterization of the trophic pathways variability of the two main spawning grounds for BFT larvae. PMID:26225849

  20. Effects of on-board and dockside handling on the formation of biogenic amines in mahimahi (Coryphaena hippurus), skipjack tuna (Katsuwonus pelamis), and yellowfin tuna (Thunnus albacares).

    Science.gov (United States)

    Staruszkiewicz, Walter F; Barnett, James D; Rogers, Patricia L; Benner, Ronald A; Wong, Lynn L; Cook, John

    2004-01-01

    Consumer illnesses by scombroid poisonings have been a continuing problem for many years. The intoxications follow the ingestion of fish such as tuna and mahimahi that have undergone bacterial decomposition, leading to the formation of biogenic amines. Research studies have concluded that histamine is one of the indicators of scombrotoxic fish and that other amines, such as cadaverine, could be involved in the illnesses. Guidance for the handling of fish on board fishing vessels to prevent the production of scombrotoxic fish has been limited by a lack of data addressing changes that occur in fish from the water to delivery at dockside. In this study, the changes in selected biogenic amines were determined in mahimahi and tuna, which were captured and held in seawater at 25 to 35 degrees C for incubation times up to 18 h. The fillets from the treated fish were sectioned by transverse cuts and analyzed for histamine, cadaverine, and putrescine. Results showed that at 26 degrees C, more than 12 h of incubation were required before a histamine concentration of 50 ppm was reached in mahimahi. At 35 degrees C, 50 ppm histamine formed within 9 h. Similar results were found for skipjack and yellowfin tuna. Histamine concentrations exceeded 500 ppm within an additional 3 h of incubation in mahimahi. At both temperatures, an increase in the concentration of cadaverine preceded an increase in histamine levels. Changes in putrescine concentrations in the fish were less pronounced. The study also demonstrated that histidine decarboxylase activity was retained in some frozen samples of fish and could result in further increases in histamine on thawing.

  1. The relationship between fat content and biological parameters of bigeye tuna ( Thunnus obseus) in the Western Central Indian Ocean

    Science.gov (United States)

    Song, Liming; Shen, Zhibin; Li, Jie; Li, Dongjing; Li, Yuwei

    2016-10-01

    Comparing fat content with physiological status can throw light on the reproduction and feeding behavior of the fish. The biological data of 586 bigeye tuna were collected from the longline fishery in the waters of Western Central Indian Ocean from November, 2012 to March, 2013. The spatial or temporal distribution of the fat content, and the relationships of fat content with gender, round weight, gonadal maturity and fork length were analyzed. A generalized additive model (GAM) was used to analyze the relationships between fat content and fork length (FL), gonadosomatic index (GSI), condition factor (K), and somatic index (SI). Results showed that: 1) the fat content of bigeye tuna was in the range of 3.1%-27.1% with the average 12.8%; 2) there were no significant geographical differences of average fat content ( P > 0.05) among 1° squares in general; 3) there were no significant differences ( P > 0.05) of the fat content for different genders, months, or gonad maturity stages; 4) there was an extremely significant correlation ( P = 0.000) between fat content and FL and GSI. There was no significant correlation ( P = 0.051) between fat content and K. There was a significant correlation ( P = 0.003) between fat content and SI. The results of this study suggest that the fat content of the matured fish was relatively stable. The survey area was in a spawning region, and the survey period was the spawning season for bigeye tuna.

  2. Evidence of discrete yellowfin tuna (Thunnus albacares) populations demands rethink of management for this globally important resource

    Science.gov (United States)

    Grewe, P. M.; Feutry, P.; Hill, P. L.; Gunasekera, R. M.; Schaefer, K. M.; Itano, D. G.; Fuller, D. W.; Foster, S. D.; Davies, C. R.

    2015-11-01

    Tropical tuna fisheries are central to food security and economic development of many regions of the world. Contemporary population assessment and management generally assume these fisheries exploit a single mixed spawning population, within ocean basins. To date population genetics has lacked the required power to conclusively test this assumption. Here we demonstrate heterogeneous population structure among yellowfin tuna sampled at three locations across the Pacific Ocean (western, central, and eastern) via analysis of double digest restriction-site associated DNA using Next Generation Sequencing technology. The differences among locations are such that individuals sampled from one of the three regions examined can be assigned with close to 100% accuracy demonstrating the power of this approach for providing practical markers for fishery independent verification of catch provenance in a way not achieved by previous techniques. Given these results, an extended pan-tropical survey of yellowfin tuna using this approach will not only help combat the largest threat to sustainable fisheries (i.e. illegal, unreported, and unregulated fishing) but will also provide a basis to transform current monitoring, assessment, and management approaches for this globally significant species.

  3. Analysis of the international fisheries management based on the proposal of including Atlantic bluefin tuna into Appendix Ⅰ of CITES Convention%基于将大西洋蓝鳍金枪鱼列入CITES附录Ⅰ提案的国际渔业管理分析

    Institute of Scientific and Technical Information of China (English)

    颜斐斐; 唐建业

    2012-01-01

    受国际市场对大西洋蓝鳍金枪鱼产品需求的驱动,非法、不报告、不管制捕捞和捕捞能力过剩等现象频频发生,造成该鱼类资源的数量持续下降。瑞典、摩纳哥先后向濒危野生动植物种国际贸易委员会提议将大西洋蓝鳍金枪鱼列入《濒危野生动植物种国际贸易公约》附录,禁止捕捞和国际贸易该鱼种,引起了广泛关注和激烈争论。为此,通过分析ICCAT对大西洋蓝鳍金枪鱼的管理、相关国家或地区组织的不同意见,研究该提案可能对国际渔业管理及我国带来的影响。一旦该鱼种列入CITES附录,可能导致更多商业开发的水生生物被提到CITES框架上来,从而影响世界渔业的管理格局。对此,中国应采取行动,积极参加国际组织会议,参与规则制定,反映中国关注问题与主张。而作为联合国海洋法公约和ICCAT的一员,我国也有义务与其他国家合作执行ICCAT的养护和管理措施,为提高履约能力,规范国内远洋企业的管理,如按照相关要求及时、准确报送数据等,从而配合国家履行国际义务。%Driven by the demand from international market for Atlantic bluefin tuna(Thunnus thynnus) and their products,overcapacity and illegal,unregulated and unreported(IUU) fishing frequently took place,which resulted in continuous decline of the fish resources.Although relevant Regional Fishery Management Organizations(RFMOs),the International Commission for the Conservation of Atlantic Tunas(ICCAT) in this case,have adopted some conservation and management measures for this fish stock,the outcome is unsatisfied.To find an alternative solution,Monaco in 2009 proposed to include Atlantic bluefin tuna into Appendix Ⅰ of Convention on International Trade in Endangered Species of Wild Fauna and Flora(CITES),banning capture and trade.In 2010,this proposal was discussed heatedly in the fifteenth meeting of the Conference of the Parties,which had attracted

  4. Blood Volume, Plasma Volume and Circulation Time in a High-Energy-Demand Teleost, the Yellowfin Tuna (Thunnus Albacares)

    DEFF Research Database (Denmark)

    Brill, R.W.; Cousins, K.L.; Jones, D.R.

    1998-01-01

    tuna, circulation time is approximately 0.4 min (47 ml kg-1/115 ml min-1 kg- 1) compared with 1.3 min (46 ml kg-1/35 ml min-1 kg-1) in yellowtail (Seriola quinqueradiata) and 1.9 min (35 ml kg-1/18 ml min-1 kg-1) in rainbow trout (Oncorhynchus mykiss). In air-breathing vertebrates, high metabolic rates...... are necessarily correlated with short circulation times. Our data are the first to imply that a similar relationship occurs in fishes....

  5. Evaluation of FAD-associated purse seine fishery reduction strategies for bigeye tuna ( Thunnus obesus) in the Indian Ocean

    Science.gov (United States)

    Tong, Yuhe; Chen, Xinjun; Xu, Liuxiong; Chen, Yong

    2013-07-01

    In the Indian Ocean, bigeye tuna supports one of the most important fisheries in the world. This fishery mainly consists of two components: longline and purse seine fisheries. Evidence of overfishing and stock depletion of bigeye tuna calls for an evaluation of alternative management strategies. Using an age-structured operating model, parameterized with the results derived in a recent stock assessment, we evaluated the effectiveness of applying constant fishing mortality (CF) and quasi-constant fishing mortality (QCF) strategies to reduce fishing effort of purse seining with fish aggregating devices (FADs) at different rates. Three different levels of productivity accounted for the uncertainty in our understanding of stock productivity. The study shows that the results of CF and QCF are similar. Average SSB and catch during simulation years would be higher if fishing mortality of FAD-associated purse seining was reduced rapidly. The banning or rapid reduction of purse seining with FAD resulted in a mean catch, and catch in the last simulation year, higher than that of the base case in which no change was made to the purse seine fishery. This could be caused by growth overfishing by purse seine fisheries with FADs according to the per-recruit analysis. These differences would be more obvious when stock productivity was low. Transferring efforts of FAD-associated purse seining to longline fisheries is also not feasible. Our study suggests that changes are necessary to improve the performance of the current management strategy.

  6. Evaluation of FAD-associated purse seine fishery reduction strategies for bigeye tuna (Thunnus obesus) in the Indian Ocean

    Institute of Scientific and Technical Information of China (English)

    TONG Yuhe; CHEN Xinjun; XU Liuxiong; CHEN Yong

    2013-01-01

    In the Indian Ocean,bigeye tuna supports one of the most important fisheries in the world.This fishery mainly consists of two components:longline and purse seine fisheries.Evidence of overfishing and stock depletion of bigeye tuna calls for an evaluation of alternative management strategies.Using an age-structured operating model,parameterized with the results derived in a recent stock assessment,we evaluated the effectiveness of applying constant fishing mortality (CF) and quasi-constant fishing mortality (QCF) strategies to reduce fishing effort of purse seining with fish aggregating devices (FADs) at different rates.Three different levels of productivity accounted for the uncertainty in our understanding of stock productivity.The study shows that the results of CF and QCF are similar.Average SSB and catch during simulation years would be higher if fishing mortality of FAD-associated purse seining was reduced rapidly.The banning or rapid reduction of purse seining with FAD resulted in a mean catch,and catch in the last simulation year,higher than that of the base case in which no change was made to the purse seine fishery.This could be caused by growth overfishing by purse seine fisheries with FADs according to the per-recruit analysis.These differences would be more obvious when stock productivity was low.Transferring efforts of FAD-associated purse seining to longline fisheries is also not feasible.Our study suggests that changes are necessary to improve the performance of the current management strategy.

  7. Standardization of a geo-referenced fishing data set for the Indian Ocean bigeye tuna, Thunnus obesus (1952-2014)

    Science.gov (United States)

    Wibawa, Teja A.; Lehodey, Patrick; Senina, Inna

    2017-02-01

    Geo-referenced catch and fishing effort data of the bigeye tuna fisheries in the Indian Ocean over 1952-2014 were analyzed and standardized to facilitate population dynamics modeling studies. During this 62-year historical period of exploitation, many changes occurred both in the fishing techniques and the monitoring of activity. This study includes a series of processing steps used for standardization of spatial resolution, conversion and standardization of catch and effort units, raising of geo-referenced catch into nominal catch level, screening and correction of outliers, and detection of major catchability changes over long time series of fishing data, i.e., the Japanese longline fleet operating in the tropical Indian Ocean. A total of 30 fisheries were finally determined from longline, purse seine and other-gears data sets, from which 10 longline and 4 purse seine fisheries represented 96 % of the whole historical geo-referenced catch. Nevertheless, one-third of total nominal catch is still not included due to a total lack of geo-referenced information and would need to be processed separately, accordingly to the requirements of the study. The geo-referenced records of catch, fishing effort and associated length frequency samples of all fisheries are available at http://dx.doi.org/10.1594/PANGAEA.864154" target="_blank">doi:10.1594/PANGAEA.864154.

  8. Significant histamine formation in tuna ( Thunnus albacares ) at 2 degrees C - effect of vacuum- and modified atmosphere-packaging on psychrotolerant bacteria

    DEFF Research Database (Denmark)

    Emborg, Jette; Laursen, B. G.; Dalgaard, Paw

    2005-01-01

    and sensory changes were evaluated during storage at 1-3 degrees C. To explain the results obtained with naturally contaminated tuna the effect of VP and MAP on biogenic amine formation by psychrotolerant bacteria was evaluated in challenge tests at 2 degrees C and 10 degrees C. The VP tuna that caused......Occurrence and importance of psychrotolerant histamine producing bacteria in chilled fresh tuna were demonstrated in the present study. The objective was to evaluate microbial formation of histamine and biogenic amines in chilled fresh tuna from the Indian Ocean and stored either vacuum-packed (VP......) or modified atmosphere-packed (MAP). Firstly, biogenic amines and the dominating microbiota were determined in VP tuna involved in an outbreak of histamine fish poisoning in Denmark. Secondly, the microbiota of fresh MAP tuna was evaluated at the time of processing in Sri Lanka and chemical, microbial...

  9. 基于分离式卫星标志信息的金枪鱼垂直移动特性%Vertical movement characteristics of tuna (Thunnus albacares) in Pacific Ocean determined using pop-up satellite archival tags

    Institute of Scientific and Technical Information of China (English)

    张衡; 戴阳; 杨胜龙; 王晓璇; 刘光明; 陈雪忠

    2014-01-01

    Pacific yellowfin tuna (Thunnus albacares) is widely distribute in subtropical and tropical waters, extending to 40°N in the North Pacific Ocean. Understanding the biology of tunas requires the knowledge of where it lives and its various movements between different habitats. But, the movement and habitat of yellowfin tuna in the Northwest Pacific Ocean have been poor understood in the world. A total of 36 yellowfin tunas Thunnus albacares were tagged using Pop-up Satellite Archival Tags (PSATs) and released in 2010-2012 to examine their vertical movement patterns. The results showed that the return rate of 8 tunas deployed from purse seine fishery was 100%, but the recorded period of tags was only 0.5-5 days. The return rate of those tunas deployed from handline fishery was 75%, while the recorded period of tags was 0.5-91 days and the tag of 2 tunas were normally popped up. In this study, the recorded period was lower than 10 days for 18 tags, was 10-20 days for 3 tags and was longer than 20 days for 8 tags. The longest recorded time of fish ID 33339 was 91 days and its straight-line distance was 822 km from the deployed site. The second longest recorded time of fish ID 33869 was 89 days because of the 3 months set time, while its straight-line distance was only 10 km. The tunas deployed from handline fishery provided loner-time information. About 85.9% of time for yellowfin tunas lived in the 0-150 m depths, 13% of time in≥150-250 m and only 1.1% of time lived in the≥250 m depths. As for as water temperature, 81.7% of time yellowfin tunas lived in≥24℃, 16.2% of time in 16-24℃ and only 2.1% of time lived in≤16℃. In 0-50 m depth, the occurrence frequency of yellowfin tunas in night was 2 times higher than that in day, while the occurrence frequency of them in day was larger than that in night in 50-500 m depths. From the most tags data, we found that the yellowfin tuna can go up to surface water layer (<10 m) and the maximum habitat depth of 53

  10. Effects of different cold chain logistics situations on quality and microstructure of tuna (Thunnus obesus) fillets%不同冷链物流过程对金枪鱼品质及组织形态的影响

    Institute of Scientific and Technical Information of China (English)

    汤元睿; 谢晶; 李念文; 徐慧文; 苏辉; 黎柳; 潘文龙

    2014-01-01

    为研究物流过程中温度变化对金枪鱼品质及组织形态的影响,试验模拟5种不同物流过程,测定金枪鱼肉感官、色差、持水力、质构以及肌纤维间隙。结果表明,超低温冻藏大目金枪鱼肉的品质受物流过程中温度变化影响显著,储运、销售过程始终保持在-55℃的完整冷链下能够使金枪鱼肉保持良好品质;随着储运过程中温度变化次数增多、幅度增大,鱼肉劣化显著,其中,经2次-18℃运输的金枪鱼肉在冻藏末期组织松散、肌纤维间隙达17.20μm,在4℃家用冰箱中贮藏12 h后感官评分、红度值、持水力、硬度和咀嚼性分别为-0.81、5.2、53.08%、1.128 N和58.03,其质量甚至低于物流过程始终保持在-18℃而不产生温度变化的鱼肉。若运输过程不具备超低温冷藏车,仅靠超低温贮藏并不能减缓鱼肉品质劣变,此时应适当调节贮藏温度,尽量避免储运期间的温度变化;相较于2℃冷藏销售,-18℃冷冻柜销售能够使金枪鱼肉保持较好品质。研究结果可为金枪鱼储运和销售提供参考。%The process of cold chain logistics including storage, transportation, selling, and other steps, requires the temperature to be kept at an ultra-low degree of-55℃at all times-. However, because there is a current lack of mechanical cryogenic transportation vehicles in China that meet this requirement, ordinary refrigerated trucks with a temperature of only-18℃ are widely used for tuna transport. The aim of this study is to investigate the effects of variations in storing temperature and selling models on the quality and microstructure of tuna (Thunnus obesus). In this paper, four diverse situations of transportation and storage were performed to simulate:complete ultra-low temperature cold chain (-55℃), normal cold chain (-18℃), and tuna stored at -55℃ but transported afterwards at -18℃ once and twice. Three different sales

  11. Global habitat preferences of commercially valuable tuna

    KAUST Repository

    Arrizabalaga, Haritz

    2015-03-01

    In spite of its pivotal role in future implementations of the Ecosystem Approach to Fisheries Management, current knowledge about tuna habitat preferences remains fragmented and heterogeneous, because it relies mainly on regional or local studies that have used a variety of approaches making them difficult to combine. Therefore in this study we analyse data from six tuna species in the Pacific, Atlantic and Indian Oceans in order to provide a global, comparative perspective of habitat preferences. These data are longline catch per unit effort from 1958 to 2007 for albacore, Atlantic bluefin, southern bluefin, bigeye, yellowfin and skipjack tunas. Both quotient analysis and Generalised Additive Models were used to determine habitat preference with respect to eight biotic and abiotic variables. Results confirmed that, compared to temperate tunas, tropical tunas prefer warm, anoxic, stratified waters. Atlantic and southern bluefin tuna prefer higher concentrations of chlorophyll than the rest. The two species also tolerate most extreme sea surface height anomalies and highest mixed layer depths. In general, Atlantic bluefin tuna tolerates the widest range of environmental conditions. An assessment of the most important variables determining fish habitat is also provided. © 2014 Elsevier Ltd.

  12. Analysis of carbon monoxide in commercially treated tuna (Thunnus spp.) and mahi-mahi (Coryphaena hippurus) by gas chromatography/mass spectrometry.

    Science.gov (United States)

    Anderson, Collin R; Wu, Wen-Hsin

    2005-09-07

    A simple and confirmative method for quantitative determination of carbon monoxide in tuna and mahi-mahi tissues using GC/MS, following chemical liberation of CO into headspace, is described. Carbon monoxide in recent years has been employed by the fishery industry to preserve fresh appearance in selected species of finfish during frozen storage, particularly in vacuum-packaged products. Indigenous CO contents of fresh Ahi tuna and mahi-mahi were examined using the method described in this study and found to be close to or less than 150 and 100 ng/g, respectively. Commercially CO-treated, vacuum-packaged tuna from multiple sources consistently showed CO level near or greater than 1 mug/g, while CO level in the only CO-treated frozen mahi-mahi sample was in the 500 ng/g range. The difference between untreated and treated specimens was in the range of 1 order of magnitude and thus suggested an easy quantitative and confirmative method of CO using widely available instrumentation that may be potentially useful for regulatory purpose in determining whether a commercially available product has been exposed to CO even if not labeled as such.

  13. 吉尔伯特群岛海域大眼金枪鱼(Thunnus obesus)栖息环境综合指数%AN INTEGRATED HABITAT INDEX OF BIGEYE TUNA THUNNUS OBESUS IN WATERS NEAR GILBERT ISLANDS

    Institute of Scientific and Technical Information of China (English)

    宋利明; 杨嘉樑; 武亚苹; 惠明明; 吕凯凯

    2012-01-01

    根据2010年10月~2011年1月在吉尔伯特群岛海域利用金枪鱼延绳钓调查所取得的32个站点的大眼金枪鱼渔获数据,以及测得的温度、盐度、叶绿素、溶解氧浓度、水平海流及垂直海流数据,采用分位数回归的方法研究了各水层(80—240m,每40m为一层)中各环境因子与大眼金枪鱼渔获率的关系,建立“栖息环境综合指数(integratedhabitatindex,IHI)模型”,并利用另外8个站点的数据验证研究结果。结果表明,(1)IHI模型的预测能力较好;(2)不同的水层影响大眼金枪鱼分布的环境因子不同,在较浅的水层(80--200m),大眼金枪鱼的渔获率与溶解氧浓度和海流相关,而在较深水层(〉200m)则仅与温度相关;(3)大眼金枪鱼较适宜的栖息水层为120—160m;(4)大眼金枪鱼删指数分布较高的两个海域分别为2—3°S,169一175°E与l~3°S,178—180°E,建议在上述两个海域作业时,尽可能使钓具沉降到120—160m的水层,以达到减少兼捕渔获物,同时提高生产效率。%On the basis of the survey data at 32 sampling stations in waters near Gilbert Islands from Oct., 2010 through Jan., 2011, the vertical profile data of temperature, salinity, chlorophyll-a, dissolved oxygen concentration, hori- zontal current, vertical current and the catch per unit effort (CPUE) data of bigeye tuna were applied to develop the “Inte- grated Habitat Index (IHI)” models by the quantile regression method. Models were developed for six water strata from 40m to 280m (40m per stratum) and the entire water column to understand the relationship between the bigeye tuna CPUE and the environmental variables. The measured environmental variables at the other eight sampling stations were used to validate the models' predictive power. The results showed: (1) the models' predictive power was good; (2) the key envi- ronmental parameters in the IHI models

  14. A large outbreak of scombroid fish poisoning associated with eating yellowfin tuna (Thunnus albacares) at a military mass catering in Dakar, Senegal.

    Science.gov (United States)

    Demoncheaux, J-P; Michel, R; Mazenot, C; Duflos, G; Iacini, C; de Laval, F; Delaval, F; Saware, E M; Renard, J-C

    2012-06-01

    On 26 November 2010, an outbreak of scombroid fish poisoning occurred in the French Armed Forces in Dakar, Senegal. This chemical intoxication, due to high histamine concentration in fish, is often mistaken for an allergic reaction. A case-control study was undertaken including the 71 cases and 78 randomly selected controls among lunch attendees. The usual symptoms for scombroid fish poisoning were observed in cases, i.e. flushing (85.9%), headache (83.1%), rapid/weak pulse (59.1%) and diarrhoea (47.9%). Symptoms occurred from within a few minutes to up to 3 h following the meal. Most patients quickly recovered with antihistamine and/or symptomatic treatment. Tuna was the only food item positively associated with illness (odds ratio 36.3, 95% confidence interval 6.3-210.0), with the risk of illness increasing with the quantity of fish consumed. No bacterial contamination was found in leftover food, but histamine concentration in tuna was found to be 4900 mg/kg, almost 50-fold higher than the concentration allowed by European regulations. This report is unique because of the large size of the case series - to our knowledge, the largest event of scombroid fish poisoning ever reported - and the chemical and bacteriological analyses results obtained on leftover food.

  15. Development of Formaldehyde Biosensor for Determination of Formalin in Fish Samples; Malabar Red Snapper (Lutjanus malabaricus) and Longtail Tuna (Thunnus tonggol).

    Science.gov (United States)

    Noor Aini, Bohari; Siddiquee, Shafiquzzaman; Ampon, Kamaruzaman

    2016-06-30

    Electrochemical biosensors are widely recognized in biosensing devices due to the fact that gives a direct, reliable, and reproducible measurement within a short period. During bio-interaction process and the generation of electrons, it produces electrochemical signals which can be measured using an electrochemical detector. A formaldehyde biosensor was successfully developed by depositing an ionic liquid (IL) (e.g., 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][Otf])), gold nanoparticles (AuNPs), and chitosan (CHIT), onto a glassy carbon electrode (GCE). The developed formaldehyde biosensor was analyzed for sensitivity, reproducibility, storage stability, and detection limits. Methylene blue was used as a redox indicator for increasing the electron transfer in the electrochemical cell. The developed biosensor measured the NADH electron from the NAD⁺ reduction at a potential of 0.4 V. Under optimal conditions, the differential pulse voltammetry (DPV) method detected a wider linear range of formaldehyde concentrations from 0.01 to 10 ppm within 5 s, with a detection limit of 0.1 ppm. The proposed method was successfully detected with the presence of formalin in fish samples, Lutjanus malabaricus and Thunnus Tonggol. The proposed method is a simple, rapid, and highly accurate, compared to the existing technique.

  16. Development of Formaldehyde Biosensor for Determination of Formalin in Fish Samples; Malabar Red Snapper (Lutjanus malabaricus and Longtail Tuna (Thunnus tonggol

    Directory of Open Access Journals (Sweden)

    Bohari Noor Aini

    2016-06-01

    Full Text Available Electrochemical biosensors are widely recognized in biosensing devices due to the fact that gives a direct, reliable, and reproducible measurement within a short period. During bio-interaction process and the generation of electrons, it produces electrochemical signals which can be measured using an electrochemical detector. A formaldehyde biosensor was successfully developed by depositing an ionic liquid (IL (e.g., 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][Otf], gold nanoparticles (AuNPs, and chitosan (CHIT, onto a glassy carbon electrode (GCE. The developed formaldehyde biosensor was analyzed for sensitivity, reproducibility, storage stability, and detection limits. Methylene blue was used as a redox indicator for increasing the electron transfer in the electrochemical cell. The developed biosensor measured the NADH electron from the NAD+ reduction at a potential of 0.4 V. Under optimal conditions, the differential pulse voltammetry (DPV method detected a wider linear range of formaldehyde concentrations from 0.01 to 10 ppm within 5 s, with a detection limit of 0.1 ppm. The proposed method was successfully detected with the presence of formalin in fish samples, Lutjanus malabaricus and Thunnus Tonggol. The proposed method is a simple, rapid, and highly accurate, compared to the existing technique.

  17. Influence of fronts on the spatial distribution of albacore tuna (Thunnus alalunga) in the Northeast Pacific over the past 30 years (1982-2011)

    Science.gov (United States)

    Xu, Yi; Nieto, Karen; Teo, Steven L. H.; McClatchie, Sam; Holmes, John

    2017-01-01

    The association of albacore tuna distribution with subtropical fronts in the Northeast Pacific was examined on seasonal and interannual scales from 1982 to 2011. Spatial analyses were performed on commercial logbook data from US and Canadian troll and pole-and-line fisheries targeting albacore tuna that were matched with corresponding satellite images from the Advanced Very High Resolution Radiometer (AVHRR). Subtropical fronts were detected by deriving sea surface temperature (SST) gradients on large basin-scales and by using an improved version of the Cayula-Cornillon frontal detection algorithm. Based on our results, we suggest that areas with high albacore catch-per-unit-effort (CPUE) tend to occur in regions with high SST gradients, such as the North Pacific Transition Zone (NPTZ) and the North American coast. Approaching the North American coast along the NPTZ, SST gradients drop off substantially around 130°W before increasing rapidly near the coast, which corresponded to a similar pattern in albacore CPUE. In the NPTZ, the centroid of albacore CPUE showed a seasonal shift northwards in summer and southwards in fall, which coincided with seasonal spatial shifts of areas with high SST gradients. A similar pattern was found on an interannual scale, with the exception of several years with limited fishery data in the NPTZ due to changes in fishery operations. A fine-scale analysis of frontal locations suggested that areas with high albacore CPUE are associated with oceanic fronts, with the highest albacore CPUEs observed within 100 km of the nearest front. In addition, albacore distribution is related to frontal strength, with the highest CPUE found near fronts with high SST gradient values in the range of 0.12-0.16 °C km-1. Integrating our findings on the influence of frontal areas on albacore distribution and abundance in the NEPO should improve the standardization model used to derive abundance indices for North Pacific albacore stock assessments.

  18. 黑鳍生食金枪鱼解冻后不同气体比例气调包装的新鲜度变化%Freshness Changes of Thawed Bluefin Tuna Used for Raw Consumption during Storage in Modified Atmospheres with Different Gas Compositions

    Institute of Scientific and Technical Information of China (English)

    贡慧; 杨震; 史智佳; 刘梦; 李少鹏; 陈文华

    2016-01-01

    In this paper, we examined the effect of modified atmosphere packaging on theK value, pH value and sensory quality of thawed bluefin tuna meat during storage at 4℃. The results showed that when the modified atmosphere was CO2:N2= 60:40 (V/V), the freshness of tuna meat was preserved for the longest period of time (96 h), with no obvious acidification. Under refrigeration conditions, theK value can reflect the sensory quality of blackfin tuna meat with respect to taste and flavor.%以黑鳍金枪鱼为对象,研究4℃条件下气调包装对其K值、pH值与感官品质的影响。结果表明:当气调包装的气体比例为CO2∶N2=60∶40(V/V)时,黑鳍金枪鱼保鲜时间最久,可达到96 h,且不会发生明显酸化;在冷藏条件下,K值可以从滋味、气味的角度很好地反映黑鳍金枪鱼的感官品质。

  19. 50 CFR 300.181 - Definitions.

    Science.gov (United States)

    2010-10-01

    ..., which is an animal of the Linnaean taxonomic superorder Selachimorpha, subclass Elasmobranchii, class Chondrichthyes. Southern bluefin tuna means the species Thunnus maccoyii found in any ocean area....

  20. OPTIMASI KONDISI PEMURNIAN ASAM LEMAK OMEGA-3 DARI MINYAK HASIL SAMPING PENEPUNGAN TUNA (Thunnus sp DENGAN KRISTALISASI UREA [Optimizing Conditions for the Purification of Omega-3 Fatty Acids from By-product of Tuna (Thunnus sp Meal Processing by Urea Crystallization

    Directory of Open Access Journals (Sweden)

    Teti Estiasih1*

    2009-12-01

    Full Text Available Omega-3 fatty acids (-3 are proven to have health beneficial effects. Some effort had been done to obtained oil high in -3 fatty acids. Among the methods developed, urea crystallization was preferred because it is simple, economic, and result in high purity of fatty acids. A source that had not been widely explored for -3 fatty acids production is the by-product of tuna meal processing. This research studied the optimization condition for separation and purification of -3 fatty acids from the by-product of tuna meal processing by urea crystallization. Crystallization reaction conditions of urea inclusion were optimized using the response surface methodology, and the model was developed.Optimization result showed a quadratic polynomial regression equation of Y= 140,52677X1 + 8,38203X2 – 19,85850X12 – 0,12173X22 – 0,74000X1X2 – 240,33546 with X1=urea to fatty acid ratio and X2=crystallization time. Maximum response was obtained at urea to fatty acid ratio of 3,07:1,crystallization time of 25,10 hours, and predicted response was 80,60%. Analysis of variance showed that urea to fatty acid ratio and crystallization time affected response. Under optimal conditions, the product was 3.89 times concentrated and the purity of -3 fatty acids was 81,98%. Verification result revealed that the predicted value from this model was reasonably close to the experimentally observed value. Urea crystallization process changed quality parameters that were oxidation level (peroxide value, anisidin value, and totox value, Fe and Cu content, P content, and water content. The changes were caused by adsorption of primary and secondary oxidation products, part of metals, and phosphoric compound onto unsaponifiable matters or soluble into water.

  1. Vertical distribution of bigeye tuna Thunnus obesus in the tropical In-dian Ocean%热带印度洋大眼金枪鱼垂直分布空间分析

    Institute of Scientific and Technical Information of China (English)

    陈雪忠; 杨胜龙; 张禹; 樊伟; 伍玉梅

    2013-01-01

      为了解热带印度洋大眼金枪鱼(Thunnus obesus)适宜的垂直和水平空间分布范围,采用Argo浮标剖面温度数据重构热带印度洋10℃、12℃、13℃和16℃月平均等温线场,网格化计算了12℃、13℃等温线深度值和温跃层下界深度差,并结合印度洋金枪鱼委员会(IOTC)大眼金枪鱼延绳钓渔业数据,绘制了12℃、13℃等温线深度与月平均单位捕捞努力渔获量(CPUE)的空间叠加图,用于分析热带印度洋大眼金枪鱼中心渔场 CPUE 时空分布和高渔获率水温的等温线时空分布的关系。结果表明,从垂直分布来看,热带印度洋中心渔场延绳钓高渔获率区域垂直分布在温跃层下界以下,在表层以下150~400 m 深度区间。从水平分布来看,12℃等温线,高 CPUE 区域大多深度值300 m, the CPUE tends to be low. Similarly, the highest CPUEs were observed in areas where the 13°C isothermal depth was shallower than 300 m (mode:190−275 m), whereas CPUE was low when the depth exceeded 400 m. The vertical distribution of high hook rates was concentrated in the area to the north of 15°S. We used a frequency analysis and the empirical cumulative distribution function to compute the optimum range of subsurface factors. The optimum ranges for the12 and 13°C isothermal depths were between 250−340 m and 190−270 m, respectively. The optimum depth difference ranges were 30–130 m for the 12°C isothermal depth and 0–70 m for the13°C isothermal depth. We documented the distribution interval and vertical depth range for the central fishing ground of bigeye tuna. Our results provide a reference for improving the efficiency of thelong-line fleet and aiding in resource management.

  2. CPUE standardization of Chinese longline fishery for targeting bigeye tuna,Thunnus obesus in the Indian Ocean%印度洋中国大眼金枪鱼延绳钓渔业CPUE标准化

    Institute of Scientific and Technical Information of China (English)

    戴小杰; 马超; 田思泉

    2011-01-01

    Generalized Linear Models (GLM) and Generalized Additive Models (GAM) were used to standardize catch per unit fishing effort (CPUE) of Chinese bigeye tuna ( Thunnus obesus) fishery in the Indian Ocean.In CPUE standardization, nominal CPUE was treated as the dependent variable and three groups of affected variables were considered: spatial variables (longitude and latitude), temporal variables (year and month) and environmental variables (temperature at various depths, salinity at various depths and Sea Level Height).The results indicated that the standardized and nominal CPUEs were similar and showed the same trends in spatio-temporal distribution.The CPUE increased with year and high CPUE usually occurred in 42°E -60°E, 85°E -90°E, 15°S -5°S and 10°N - 15°N.Both the results of GLM and GAM showed that the longitude was the most important variable affecting CPUE, which could explain 17.3% and 23.81% of the deviance, respectively.The effects of latitude, the interaction terms of longitude and latitude,year, temperature at 317 m depth and temperature at 381 m depth on CPUE were also apparent.GLM tended to be more appropriate than GAM in the analysis of CPUE standardization in this study.%使用广义线性模型(GLM)和广义可加模型(GAM)对印度洋中国大眼金枪鱼渔业的单位捕捞努力量渔获量(CPUE)进行标准化.在CPUE标准化模型中,考虑了空间(经度与纬度)、时间(年与月)和环境(包括各深度温度、各深度盐度和海平面高度)等变量.结果表明,标准化CPUE和名义CPUE在时空分布上呈相似的趋势.年CPUE随时间呈现下降的趋势,高CPUE经常出现在42°E~60°E、85°E~90°E、15°S~5°S和10°N~15°N的区域内.GLM和GAM分析郜显示出经度是影响CPUE最重要的变量,可分别解释17.3%和23.8l%的变异;纬度、经度和纬度的交互效应、年份、381 m水层温度、317 m水层温度对CPUE的影响也是明显的.此研究中GLM模型比GAM模型更合适.

  3. 大西洋中部金枪鱼延绳钓渔场黄鳍金枪鱼(Thunnus albacares)生物学特性的初步研究%PRELIMINARY ANALYSIS OF BIOLOGICAL CHARACTERISTICS OF YELLOWFIN TUNA THUNNUS ALBACARES IN THE TUNA LONGLINE FISHING GROUND OF THE CENTRAL ATLANTIC OCEAN

    Institute of Scientific and Technical Information of China (English)

    宋利明; 陈新军; 许柳雄

    2004-01-01

    根据2001年6月16日-10月27日大西洋中部金枪鱼延绳钓渔场现场所作的生物学测定数据,应用统计与回归的方法分别对黄鳍金枪鱼(Thunnus albacares)的性腺成熟度、摄食等级、摄食种类、性比、叉长分布、叉长与纯重的关系、叉长与原条鱼重的关系、原条鱼重与纯重的关系等进行了研究.结果表明,(1)性腺成熟度Ⅵ级占的比例最高,为47.06%.(2)摄食等级以1级为主,其次为0级,分别占45.45%和18.18%.(3)胃含物中以鱿鱼出现的频率为最高,占44.44%,其次是沙丁鱼和杂鱼,分别占27.78%和25.00%.(4)雄性与雌性的性比约为1.43比1.(5)优势叉长为1.31-1.47m,占31.44%,平均叉长为1.39m.(6)不分性别、雄性和雌性黄鳍金枪鱼叉长(FL)与纯重(DW)的关系可表达为:DW=5.6632×10-6FL3.1951.(7)不分性别、雄性和雌性黄鳍金枪鱼叉长(FL)与原条鱼重(RW)的关系分别为:RW=8.5072×10-6FL3.1390、RWM=1.1229×10-5 FLM3.0847、RWF=7.1711×10-6FLF3.1721.(8)不分性别、雄性和雌性黄鳍金枪鱼原条鱼重(RW)与纯重(DW)的关系分别为:RW=1.1339DW、RWM= 1.1320DWM、RWF=1.1399DWF.

  4. Bluefin Tuna Life History (1972-1979)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Catch and size data for animals from which a collection of fish parts were done for life history studies. These samples will be used in comparison studies with more...

  5. Biogenic amine content, histamine-forming bacteria, and adulteration of pork in tuna sausage products.

    Science.gov (United States)

    Kung, Hsien-Feng; Tsai, Yung-Hsiang; Chang, Shih-Chih; Hong, Tang-Yao

    2012-10-01

    Twenty-five tuna sausage products were purchased from retail markets in Taiwan. The rates of occurrence of biogenic amines, histamine-forming bacteria, and adulteration by pork and poultry were determined. The average content of various biogenic amines in all tested samples was less than 2.0 mg/100 g (sausage. The fish species in the tuna sausage samples were identified as Thunnus albacares for 22 samples (88%), Thunnus alalunga for 1 sample (4%), and Thunnus thynnus for 1 sample (4%), whereas the remaining sample was identified as Makaira nigricans (blue marlin).

  6. 77 FR 73969 - International Fisheries; Pacific Tuna Fisheries; Fishing Restrictions in the Eastern Pacific Ocean

    Science.gov (United States)

    2012-12-12

    .... Current IATTC membership includes: Belize, Canada, China, Chinese Taipei (Taiwan), Colombia, Costa Rica...; Pacific Tuna Fisheries; Fishing Restrictions in the Eastern Pacific Ocean AGENCY: National Marine... on commercial retention of bluefin tuna by U.S. fishing vessels operating in the Eastern...

  7. 78 FR 33240 - International Fisheries; Pacific Tuna Fisheries; Fishing Restrictions in the Eastern Pacific Ocean

    Science.gov (United States)

    2013-06-04

    ..., Canada, China, Chinese Taipei (Taiwan), Colombia, Costa Rica, Ecuador, El Salvador, the European Union...; Pacific Tuna Fisheries; Fishing Restrictions in the Eastern Pacific Ocean AGENCY: National Marine... commercial retention of Pacific bluefin tuna by U.S. fishing vessels operating in the Eastern Pacific...

  8. 南海及临近海域黄鳍金枪鱼渔场时空分布与海表温度的关系%Relationship between temporal-spatial distribution of yellowfin tuna Thunnus albacares fishing grounds and sea surface temperature in the South China Sea and adjacent waters

    Institute of Scientific and Technical Information of China (English)

    纪世建; 周为峰; 王鲁民; 唐峰华; 吴祖立; 陈国宝

    2016-01-01

    为得到南海及临近海域黄鳍金枪鱼(Thunnus albacores)渔场最适宜栖息海表温度(SST)范围,基于美国国家海洋大气局(NOAA )气候预测中心月平均海表温度(SST)资料,结合中西太平洋渔业委员会(WCPFC)发布的南海及临近海域金枪鱼延绳钓渔业数据,绘制了月平均SST和月平均单位捕捞努力量渔获量(CPUE)的空间叠加图,用于分析南海及临近海域黄鳍金枪鱼渔场CPUE时空分布和SST的关系.结果表明,南海及临近海域黄鳍金枪鱼CPUE在16 ℃~31 ℃均有分布.在春季和夏季(3 ~8 月),位于10°~20°N的大部分渔区CPUE较高,其南北侧CPUE较低;而到了秋季和冬季(9月到次年2月),高产渔场区域会向南拓宽.CPUE在各SST区间的散点图呈现出明显的负偏态分布,高CPUE主要集中在26 ℃~30 ℃,最高值出现在29℃附近;在22 ℃ ~26 ℃范围内 CPUE散点分布较为零散,但在这个范围也会出现相当数量的高CPUE;在22 ℃以下的CPUE几乎属于低CPUE和零CPUE;零CPUE的平均SST为26 .7 ℃(±3 .2 ℃),低CPUE的平均SST为27.8 ℃(±2.1 ℃),高CPUE的平均SST为28.4℃(±1.5 ℃),高CPUE在各SST区间的分布要比零CPUE和低CPUE更为集中.采用频次分析和经验累积分布函数计算其最适SST范围,得到南海及临近海域黄鳍金枪鱼最适SST为26 .9 ℃~29 .4 ℃.本研究初步得到南海及临近海域黄鳍金枪鱼中心渔场时空分布特征及SST适宜分布区间,可为开展南海及临近海域金枪鱼渔情预报工作提供理论依据和参考.%South China Sea is an important yellowfin tuna Thunnus albacares longline fishing ground in China. There is little research on relationship between the temporal-spatial distribution of yellowfin tuna fishing grounds and sea surface temperature (SST)environment in the South China Sea and its adjacent waters. Based on the monthly averaged SST data provided by the Climate Prediction Center of the National Oceanic and Atmospheric

  9. Relationship between the temporal-spatial distribution of longline fishing grounds of yellowfin tuna (Thunnus albadares)and the thermocline characteristics in the Western and Central Pacific Ocean%中西太平洋延绳钓黄鳍金枪鱼渔场时空分布与温跃层关系

    Institute of Scientific and Technical Information of China (English)

    杨胜龙; 张忭忭; 靳少非; 樊伟

    2015-01-01

    We evaluated the isoline distribution of thermocline characteristics (the upper and lower boundary temper-atures and depths)in the yellowfin tuna (Thunnus albacares )fishing grounds in Western and Central Pacific O-cean.We plotted the thermocline characteristics contour on a spatial overlay map using data collected on a monthly basis from Argo buoys and monthly CPUE (catch per unit effort)from yellowfin tuna longlines from the Western and Central Pacific Fisheries Commission (WCPFC).In addition,frequency analysis and the empirical cumulative distribution function (ECDF)were used to calculate the optimum ranges for the thermocline characteristics of the central fishing grounds.Our analysis suggested that there were significant seasonal variations in the upper bounda-ry temperature and depth of the thermocline in the central fishing grounds,which significantly influenced the tem-poral and spatial distribution of the yellowfin tuna population.However,the lower boundary temperature and depth of thermocline has little seasonal variation.The overlay maps suggest that the central fishing grounds were ob-served in areas where the upper boundary depth of thermocline was deeper,and south-north moved follow by ther-mocline.The values between 70 and 100 m in the east zonal areas of New Guinea,and the central fishing grounds were found all year.The fishing grounds distributed where the upper boundary temperature of the thermocline was higher than 26℃,but CPUE was lower than Q3 while temperature higher than 30℃.The fishing grounds located between the two high value shape of the lower boundary depth of thermocline,if the depth was more than 300 m or less than 150 m,the CPUE tended to be low.The lower boundary temperature of the thermocline in the fishing grounds was lower than 13℃ all year in the equatorial zone.Conversely,if the temperature was higher than 17℃, the hooking rates are very low.Frequency analysis and the empirical cumulative distribution function (ECDF

  10. 基于分位数回归的库克群岛海域长鳍金枪鱼栖息环境综合指数%An integrated habitat index for albacore tuna (Thunnus alalunga) in the waters near the Cook Islands based on the quantile regression method

    Institute of Scientific and Technical Information of China (English)

    杨嘉樑; 黄洪亮; 宋利明; 饶欣; 吴越; 齐广瑞

    2014-01-01

    We developed an“Integrated Habitat Index (IHI)”model based on the quantile regression method using sur-vey data collected at 43 sites in waters near the Cook Islands from September, 2012 through November, 2012. The model variables included vertical profile data for temperature, salinity, chlorophyll-a, horizontal current, vertical current and catch per unit effort (CPUE) of albacore tuna(Thunnus alalunga), and the interactions among these variables. Mod-els were developed for five 40 m water strata between 40 m and 240 m and the entire water column to predict the spatial distribution of albacore tuna. The environmental variables measured at modeling sites were used as inputs to the IHI models to predict the IHI value of the 5 strata and the entire water column. We tested for a significant difference be-tween the observed CPUE and predicted CPUE within the 5 water strata and the entire water column using a Wilcoxon test. The Spearman correlation coefficients were assumed to indicate the predictive power of the IHI model. The trend line of the arithmetic average about the predicted IHI for the 5 strata was compared with the CPUEs at the specific depth stratum. The environmental variables at validation sites were used to validate the model’s predictive power. These data were input into the CPUE models to predict the CPUE of the 5 water strata and the entire water column. We used a Wilcoxon test to compare between the predicted and observed CPUEs within the 5 water strata and the entire water column to validate the IHI results. The CPUE for albacore tuna in the 5 strata and the entire water column exhibited a skewed normal distribution with a longer left tail. There was no significant difference between the nominal CPUEs and predictive CPUEs of albacore in the 5 water strata and the entire water column at the modelling sites or the validation sites. The IHI models had good predictive power, and were able to accurately predict the distribution of albacore tuna in

  11. Bioenergetics, Trophic Ecology, and Niche Separation of Tunas.

    Science.gov (United States)

    Olson, R J; Young, J W; Ménard, F; Potier, M; Allain, V; Goñi, N; Logan, J M; Galván-Magaña, F

    Tunas are highly specialized predators that have evolved numerous adaptations for a lifestyle that requires large amounts of energy consumption. Here we review our understanding of the bioenergetics and feeding dynamics of tunas on a global scale, with an emphasis on yellowfin, bigeye, skipjack, albacore, and Atlantic bluefin tunas. Food consumption balances bioenergetics expenditures for respiration, growth (including gonad production), specific dynamic action, egestion, and excretion. Tunas feed across the micronekton and some large zooplankton. Some tunas appear to time their life history to take advantage of ephemeral aggregations of crustacean, fish, and molluscan prey. Ontogenetic and spatial diet differences are substantial, and significant interdecadal changes in prey composition have been observed. Diet shifts from larger to smaller prey taxa highlight ecosystem-wide changes in prey availability and diversity and provide implications for changing bioenergetics requirements into the future. Where tunas overlap, we show evidence of niche separation between them; resources are divided largely by differences in diet percentages and size ranges of prey taxa. The lack of long-term data limits the ability to predict impacts of climate change on tuna feeding behaviour. We note the need for systematic collection of feeding data as part of routine monitoring of these species, and we highlight the advantages of using biochemical techniques for broad-scale analyses of trophic relations. We support the continued development of ecosystem models, which all too often lack the regional-specific trophic data needed to adequately investigate climate and fishing impacts.

  12. [Otolith microchemistry of tuna species: research progress].

    Science.gov (United States)

    Zhu, Guo-ping

    2011-08-01

    Microchemistry analysis of trace elements and isotopes in fishes' calcified substances is an emerging approach to analyze the population structure, life history, and migration environmental history of fishes. With the increasing improvement of the researches and applications of otolith microchemistry, this approach has been a good tool for studying the ecology of tuna species. Currently, the research contents of tuna species' otolith microchemistry mainly include trace elements and isotopes, and the former is the emphasis and hotspot in applied research, playing a vital role in the researches of population partitioning, natal origin, migration environmental history, and life history of tuna species, especially bluefin tuna. However, most of the researches are focusing on the variation of otolith's Sr/Ca ratio, and there is no final conclusion on the relationships between the fractionation of isotopes C and O in otolith and the temperature. For the sake of exploiting the huge value of otolith microchemistry, it would be necessary to strengthen the researches on the deposition mechanisms of trace elements in otolith, and to analyze the spatio-temporal variations of various trace elements in otolith by comprehensive research methods.

  13. Antioxidant activity and physicochemical properties of 1 ku fraction by ultrafiltration of bigeye tuna (Thunnus obesus) head protein hydrolysate%大眼金枪鱼头蛋白酶解物1ku超滤组分的抗氧化活性及其理化性质

    Institute of Scientific and Technical Information of China (English)

    杨萍; 柯虹乔; 章超桦; 洪鹏志

    2012-01-01

    研究大眼金枪鱼头蛋白酶解物1 ku超滤组分体外的还原力、自由基清除能力及对衰老小鼠体内抗氧化能力的影响,分析1 ku超滤组分的一般成分、氨基酸组成及分子量分布,为进一步分离纯化金枪鱼头抗氧化肽提供基础.体外结果显示,1ku超滤组分对羟基自由基、超氧阴离子和DPPH自由基的清除活性随浓度的增加而增强,IC50分别为1.38、0.73与0.93mg/mL,还原力也随浓度的增加而增大,在浓度为12.5 mg/mL时为0.763;体内结果显示,灌胃30 mg/kg的1 ku超滤组分连续42 d,D-半乳糖致衰老小鼠肝组织的超氧化物歧化酶(SOD)活性、肝组织和血清的谷胱甘肽过氧化物酶(GSH-Px)活性显著提高(P<0.05),血清丙二醛(MDA)含量显著降低(P<0.01);理化分析结果显示,1 ku超滤组分(干基计)蛋白质含量为96.40%,脂肪0.11%,灰分4.86%,疏水性氨基酸占氨基酸总量的35.8%,活性组分分子量在1 802~2 519 u和422~922 u.%To produce bioactive peptides from the by-products of fish processing, bigeye tuna (Thunnus obesus) head was hydrolyzed by alcalase, and the tuna head protein hydrolysate (THPH) was fractionated through ultrafiltration membranes with a range of molecular weight cutoffs (MWCO) of 8, 5, 3 and 1 ku, respectively, to yield the fraction THPH-1 with MW distribution<1 ku. The antioxidant activities of THPH-1 were evaluated using reducing power, free radical scavenging and aged model mice induced by D-galactose. The physicochemical properties of THPH-1 were analysed also. THPH-1 showed evident radical scavenging activity in a dose-dependent manner with the IC50 values for hydroxyl radical, superox-ide radical and l,l-diphenyl-2-pycrylhydrazyl (DPPH) radical being 1.38, 0.73 and 0.93 mg/mL respectively. The reducing power of THPH-1 was 0.763 at 12.5 mg /mL. The activities of superoxide dismutase (SOD) of liver and the activities of glutathione peroxidase (GSH-Px) of liver and serum in aged

  14. DAYA DUKUNG SUMBER DAYA PERIKANAN TUNA DI SAMUDERA HINDIA DALAM KAITANNYA DENGAN INDUSTRIALISASI PERIKANAN

    Directory of Open Access Journals (Sweden)

    Wijopriono Wijopriono

    2012-11-01

    Full Text Available Pemerintah berupaya untuk meningkatkan produksi dan ekspor hasil perikanan melalui program industrialisasi perikanan. Diantara komoditas utama perikanan yang ditetapkan menjadi target pertumbuhan ekspor adalah tuna dan cakalang. Salah satu area penangkapan penghasil komoditas tersebut adalah Samudera Hindia, yang menyumbang sekitar 17% dari seluruh produksi tuna dan cakalang Indonesia. Namun demikian, beberapa tahun terakhir ini produksi tuna dari perairan ini terus menurun. Peningkatan jumlah kapal yang lebih pada ukuran 10-30 GT belum mampu meningkatkan produksi secara berarti. Kajian stok global menunjukkan bahwa peluang untuk meningkatkan produksi dapat dilakukan untuk jenis tuna mata besar, madidihang dan cakalang. Untuk itu restrukturisasi armada penangkap tuna dan cakalang di Samudera Hindia diperlukan. Indonesian Government has been striving for increasing export of fish and fishery products through fisheries industrialization program. Among the commodities that has been targeted for the program are tuna and skipjack. One of the fishing areas for producing these commodities is Indian Ocean, which has contributed more than 17% to the total Indonesian tuna production. However, tuna production from this area has decreased during last couples of years. The increase of fleet number more on the size of 10-30 GT have not been able to increase tuna production sgnificantly. Global stock assessment suggested that there is an opportunity to increase tuna production, specifically yellowfin (Thunnus albacares, bigeye (T. obesus , and skipjack (Katsuwonus pelamis. To achieve this objective, restructurization of fishing fleet operated in Indian Ocean is needed.

  15. MASS SPECTROMETRIC ANALYSIS FOR THE IDENTIFICATION OF THUNNUS GENUS FOUR SPECIES

    Directory of Open Access Journals (Sweden)

    T. Pepe

    2011-01-01

    Full Text Available An accurate identification of similar fish species is necessary to prevent illegal substitution and is imposed by labeling regulations in UE countries (1. The genus Thunnus comprises many species of different quality and commercial value. The increasing trade of fish preparations of the species included in this genus and the consequent loss of the external anatomical and morphological features enables fraudulent substitutions. This study reports data relating to the proteomic analysis of four tuna species (T. thynnus, T. alalunga, T. albacares, T. obesus. Sarcoplasmic proteins were studied by mono and two dimensional electrophoresis. The most significant proteins for the characterization of the species were analyzed by mass spectrometric techniques. As reported in a previous study (2, an accurate identification of the species seems possible, owing to the polymorphism displayed by the species of the Thunnus genus.

  16. SEBARAN HASIL TANGKAPAN MADIDIHANG (Thunnus albacares Bonnaterre, 1788 DI SAMUDERA HINDIA BAGIAN TIMUR

    Directory of Open Access Journals (Sweden)

    Arief Wujdi

    2015-06-01

    Full Text Available Ikan Madidihang (Thunnus albacares Bobbaterre, 1788 merupakan salah satu komoditaspenting bagi industri perikanan di Indonesia dimana hasil tangkapannya merupakan yang tertinggi dibandingkan jenis tuna lainnya. Saat ini, kondisi stok madidihang berada dalam kondisi yang baik. Namun, untuk menjaga kelangsungan pemantaatan stok ikan tuna, diperlukan upaya pengelolaan sumber daya tuna. Penelitian ini bertujuan untuk mengetahui distribusi laju tangkap madidihang di Samudera Hindia Bagian Timur. Pengumpulan data dilakukan oleh pemantau ilmiah pada kapal rawai tuna komersial yang berbasis di Benoa, Pelabuhanratu dan Bungus dari Agustus 2005 sampai Desember 2013; serta program monitoring pendaratan tuna yang berbasis di Benoa tahun 2010-2013. Hasil penelitian menunjukkan bahwa laju pancing bervariasi secara bulanan dan tahunan. Rata-rata bulanan laju pancing tertinggi terjadi pada Mei (0,17 ekor/100 pancing dan terendah pada Februari (0,01 ekor/100 pancing, sedangkan rata-rata laju pancing tahunan tertinggi pada 2006 (0,11 ekor/100 pancing dan terendah pada 2011 (0,06 ekor/100 pancing. Rata-rata laju pancing tahunan cenderung mengalami penurunan sebesar 29,48%/ tahun. Ikan madidihang tertangkap oleh rawai tuna Indonesia tersebar dari 0°-34° LS dan 76°-134° BT. Sebaran spasial laju pancing tertinggi berada di sekitar Kepulauan Mentawai dan selatan Jawa Timur hingga Nusa Tenggara. Yellowfin tuna (Thunnus albacares Bobbaterre, 1788 is one of the important commodity for the fishing industry in Indonesia because it has the highest catches compared with other tunas. Nowadays, the yellowfin stock is currently in good condition (not overfished and not subject to overfishing. However, management measure was required to support sustainability of tuna fishery. This study aims to determine the hook rate distribution of yellowfin tuna in the Eastern Indian Ocean. Data was obtained by scientific observers on commercial tuna longline vessels

  17. STATUS PEMANFAATAN DAN PENGELOLAAN SUMBERDAYA IKAN TUNA NERITIK DI SAMUDERA HINDIA WPP 572 DAN 573

    Directory of Open Access Journals (Sweden)

    Agustinus Anung Widodo

    2014-05-01

    Full Text Available Dalam rangka mendeskripsikan status pemanfaatan dan pengelolaan sumberdaya tuna neritik di perairan Samudera Hindia (WPP 572 dan 573 telah dilakukan analisis terhadap informasi tentang jenis dan produksi tuna neritik yang disajikan dalam Statistik Perikanan Tangkap di Laut Menurut WPP tahun 2005-2012 (DJPT, 2013 serta data hasil penelitian berbasis di PPS Cilacap dan PPN Sibolga tahun 2011. Rekomendasi ‘working party’ tentang tuna neritik dari IOTC dikaji sebagai langkah pengelolaan perikanan tuna neritik di Indonesia. Hasil analisis dan kajian menunjukkan bahwa sumberdaya ikan tuna neritik yang tertangkap nelayan Indonesia di perairan WPP 572 dan 573 meliputi tongkol lisong (Auxis rochei, tongkol krai (Auxis thazard, tongkol komo atau kawakawa (Euthynnus affinis dan tongkol abu-abu (Thunnus tonggol. Tuna neritik tertangkap sebagai by-product dari pukat cincin, jaring insang hanyut, pancing tonda, pancing ulur dan bagan. Tahun 2011 produksi neritik tuna di Samudera Hindia khususnya WPP 572 dan 573 mencapai 121.818 ton atau 29,4% dari total produksi tuna neritik nasional. Tuna neritik jenis tongkol lisong dan krai yang tertangkap jaring insang hanyut yang berbasis di Cilacap > 70% merupakan ikan yang telah dewasa. Adapun tongkol komo yang tertangkap pukat cincin yang berbasis di Sibolga sekitar 55,5% merupakan ikan dewasa. Belum ada langkah-langkah pengelolaan secara spesifik terhadap sumberdaya tuna neritik di Indonesia. Merujuk hasil Working Party on Neritic Tuna pertama dan kedua tahun 2011 dan 2012, Indian Ocean Tuna Commission (IOTC merekomendasikan adanya kerjasama antar negara anggota IOTC yang saling berdekatan didalam melakukan pengelolaan sumberdaya neritik tuna. Langkah pertama adalah dilakukan perelitian mengenai populasi melalui studi mtDNA untuk memastikan status stok dan populasinya.   The species of neritic tuna caught by fishers in the Indian Ocean particularly FMAs 572 and 573 consisted of frigate tuna (Auxis thazard

  18. A spatial ecosystem and populations dynamics model (SEAPODYM) Modeling of tuna and tuna-like populations

    Science.gov (United States)

    Lehodey, Patrick; Senina, Inna; Murtugudde, Raghu

    2008-09-01

    An enhanced version of the spatial ecosystem and population dynamics model SEAPODYM is presented to describe spatial dynamics of tuna and tuna-like species in the Pacific Ocean at monthly resolution over 1° grid-boxes. The simulations are driven by a bio-physical environment predicted from a coupled ocean physical-biogeochemical model. This new version of SEAPODYM includes expanded definitions of habitat indices, movements, and natural mortality based on empirical evidences. A thermal habitat of tuna species is derived from an individual heat budget model. The feeding habitat is computed according to the accessibility of tuna predator cohorts to different vertically migrating and non-migrating micronekton (mid-trophic) functional groups. The spawning habitat is based on temperature and the coincidence of spawning fish with presence or absence of predators and food for larvae. The successful larval recruitment is linked to spawning stock biomass. Larvae drift with currents, while immature and adult tuna can move of their own volition, in addition to being advected by currents. A food requirement index is computed to adjust locally the natural mortality of cohorts based on food demand and accessibility to available forage components. Together these mechanisms induce bottom-up and top-down effects, and intra- (i.e. between cohorts) and inter-species interactions. The model is now fully operational for running multi-species, multi-fisheries simulations, and the structure of the model allows a validation from multiple data sources. An application with two tuna species showing different biological characteristics, skipjack ( Katsuwonus pelamis) and bigeye ( Thunnus obesus), is presented to illustrate the capacity of the model to capture many important features of spatial dynamics of these two different tuna species in the Pacific Ocean. The actual validation is presented in a companion paper describing the approach to have a rigorous mathematical parameter optimization

  19. 76 FR 13583 - Atlantic Highly Migratory Species; Atlantic Bluefin Tuna Quotas and Atlantic Tuna Fisheries...

    Science.gov (United States)

    2011-03-14

    ... States, Canada, and Japan). The amount of TAC allocated to the Contracting Parties depends on the amount...), Canada (22.32 percent) and Japan (17.64 percent). For the United States, 54.02 percent of the remaining 1... physically accessible to people with disabilities. Requests for sign language interpretation or...

  20. Mercury in tunas and blue marlin in the North Pacific Ocean.

    Science.gov (United States)

    Drevnick, Paul E; Brooks, Barbara A

    2017-03-06

    Models and data from the North Pacific Ocean indicate that mercury concentrations in water and biota are increasing in response to (global or hemispheric) anthropogenic mercury releases. In the present study, we provide an updated record of mercury in yellowfin tuna (Thunnus albacares) caught near Hawaii that confirms an earlier conclusion that mercury concentrations in these fish are increasing at a rate similar to that observed in waters shallower than 1000 m. We also compiled and reanalyzed data from bigeye tuna (Thunnus obesus) and blue marlin (Makaira nigricans) caught near Hawaii in the 1970s and 2000s. Increases in mercury concentrations in bigeye tuna are consistent with the trend found in yellowfin tuna, in both timing and magnitude. The data available for blue marlin do not allow for a fair comparison among years, because mercury concentrations differ between sexes for this species, and sex was identified (or reported) in only 3 of 7 studies. Also, mercury concentrations in blue marlin may be insensitive to modest changes in mercury exposure, because this species appears to have the ability to detoxify mercury. The North Pacific Ocean is a region of both relatively high rates of atmospheric mercury deposition and capture fisheries production. Other data sets that allow temporal comparisons in mercury concentrations, such as pacific cod (Gadus macrocephalus) in Alaskan waters and albacore tuna (Thunnus alalunga) off the US Pacific coast, should be explored further, to aid in understanding human health and ecological risks and to develop additional baseline knowledge for assessing changes in a region expected to respond strongly to reductions in anthropogenic mercury emissions. Environ Toxicol Chem 2016;9999:1-10. © 2017 SETAC.

  1. ANALISIS EKSPOR IKAN TUNA INDONESIA

    Directory of Open Access Journals (Sweden)

    Indriana - Yudiarosa

    2012-05-01

    Full Text Available ABSTRACT   Facing the  free trade era, Indonesia needs to reorganize its export strategies with not mainly depending on oil and gas sector only. In relation to this, tuna as Indonesia’s export commodity has plate an important role but presently Indonesia can only contribute 7% of the world tuna supply. Being one of the country which have unused tunas potensial  up to 53,7%, Indonesia’s opportunity to supply world market is the large. This studied was aimed at analyzing; factors influencing Indonesia’s tunas export; factors  influencing domestic supply of tunas; predicting tunas export in the next 5 years (2000 –2005 and study marketing strategies that effect Indonesia’s export of tuna. To analyze factors that influenced tunas export and domestic supply of tunas, simultan equation in the form of double logarithma with two stage least square (2SLS methods were used. Meanwhile, export development were analyzed with trend analysis and tunas export strategies with SWOT analysis. Result of this study showed that, tunas export price,  tunas export  tax, exchange rate and tunas export the previous year effected tunas export.Factors that influenced domestic tuna supplies were domestic prices of tunas and domestic supplies of tunas the previous year.       Tunas export prediction from 2000 – 2005 drawn from the trend analysis; shows an increase in export by average of 1.06%. Hopefully this will be followed by increase in tunas production by an average of 1.27%. Increase in tunas export must be supported by marketing strategies.Marketing strategies that can be carried out based on the SWOT analysis are improving infrastucture, transfer of technology for fleet and catch material, improvement in the quality and quantity of the product , marketing research and upgrading cooperation with importing countries.   Keywords: tuna fish, export

  2. Total mercury in fresh and processed tuna marketed in Galicia (NW Spain) in relation to dietary exposure.

    Science.gov (United States)

    García, M Ángeles; Núñez, Ricardo; Alonso, Julián; Melgar, M Julia

    2016-12-01

    Mercury is a toxic trace metal, which can accumulate to levels threatening human and environmental health. In this study, contents of total mercury have been determined by ICP-MS spectrometry in fresh and processed tuna (110 samples) purchased from supermarkets in NW Spain. Mercury was present in all samples analyzed; however, only one sample of fresh tuna (1.070 mg kg(-1) wet weight (w.w.)) slightly exceeded the limit of the EU (1.0 mg kg(-1) w.w.). The average mercury concentration in processed tuna was lower than fresh, 0.306 mg kg(-1) w.w., and ranged from 0.080 to 0.715 mg kg(-1) w.w. Results were compared with literature data. In regard to the three types of preparation-packaging media for canned tuna, total Hg content was found in the following order: olive oil > natural > pickled sauce; the last showed significant statistical differences (p < 0.01) with the other two preparations. Between the two evaluated canned tuna species, significant statistical differences (p = 0.008) were observed and Thunnus alalunga presented a greater mean content (0.332 ± 0.114 mg kg(-1) w.w.) compared to Thunnus albacares (0.266 ± 0.171 mg kg(-1) w.w.).Taking into account the AESAN recommendation for adults and children, as well as the EU regulations and the tuna consumption by the Spanish population, the Hg levels obtained in this study pose no risk to consumer health. However, additional studies, a monitoring process, and efforts to reduce Hg concentration in tuna would be necessary, as well as considering other sources of exposure to Hg.

  3. RAD-seq derived genome-wide nuclear markers resolve the phylogeny of tunas

    KAUST Repository

    Díaz-Arce, Natalia

    2016-06-07

    Although species from the genus Thunnus include some of the most commercially important and most severely overexploited fishes, the phylogeny of this genus is still unresolved, hampering evolutionary and traceability studies that could help improve conservation and management strategies for these species. Previous attempts based on mitochondrial and nuclear markers were unsuccessful in inferring a congruent and reliable phylogeny, probably due to mitochondrial introgression events and lack of enough phylogenetically informative markers. Here we infer the first genome-wide nuclear marker-based phylogeny of tunas using restriction site associated DNA sequencing (RAD-seq) data. Our results, derived from phylogenomic inferences obtained from 128 nucleotide matrices constructed using alternative data assembly procedures, support a single Thunnus evolutionary history that challenges previous assumptions based on morphological and molecular data.

  4. Tuna comparative physiology.

    Science.gov (United States)

    Graham, Jeffrey B; Dickson, Kathryn A

    2004-11-01

    Thunniform swimming, the capacity to conserve metabolic heat in red muscle and other body regions (regional endothermy), an elevated metabolic rate and other physiological rate functions, and a frequency-modulated cardiac output distinguish tunas from most other fishes. These specializations support continuous, relatively fast swimming by tunas and minimize thermal barriers to habitat exploitation, permitting niche expansion into high latitudes and to ocean depths heretofore regarded as beyond their range.

  5. Population assessment of tropical tuna based on their associative behavior around floating objects.

    Science.gov (United States)

    Capello, M; Deneubourg, J L; Robert, M; Holland, K N; Schaefer, K M; Dagorn, L

    2016-11-03

    Estimating the abundance of pelagic fish species is a challenging task, due to their vast and remote habitat. Despite the development of satellite, archival and acoustic tagging techniques that allow the tracking of marine animals in their natural environments, these technologies have so far been underutilized in developing abundance estimations. We developed a new method for estimating the abundance of tropical tuna that employs these technologies and exploits the aggregative behavior of tuna around floating objects (FADs). We provided estimates of abundance indices based on a simulated set of tagged fish and studied the sensitivity of our method to different association dynamics, FAD numbers, population sizes and heterogeneities of the FAD-array. Taking the case study of yellowfin tuna (Thunnus albacares) acoustically-tagged in Hawaii, we implemented our approach on field data and derived for the first time the ratio between the associated and the total population. With more extensive and long-term monitoring of FAD-associated tunas and good estimates of the numbers of fish at FADs, our method could provide fisheries-independent estimates of populations of tropical tuna. The same approach can be applied to obtain population assessments for any marine and terrestrial species that display associative behavior and from which behavioral data have been acquired using acoustic, archival or satellite tags.

  6. Population genetic structure of skipjack tuna Katsuwonus pelamis from the Indian coast using sequence analysis of the mitochondrial DNA D-loop region

    Digital Repository Service at National Institute of Oceanography (India)

    Menezes, M.R.; Kumar, G.; Kunal, S.P.

    ; population expansion. INTRODUCTION The tunas, belonging to the family Scombridae, comprise a highly valued group of fishes which are marketed fresh, frozen and canned. They are tropical and subtrop- ical in their distribution in the world oceans (Collette... of urea. Fisheries Science 62, 727–730. Chow, S. & Ushiama, H. (1995). Global population structure of albacore (Thunnus alalunga) inferred by RFLP analysis of the mitochondrial ATPase gene. Marine Biology 123, 39–45. doi: 10.1007/BF00350321 Chow, S...

  7. Relationships between tuna catch and variable frequency oceanographic conditions

    Science.gov (United States)

    Ormaza-González, Franklin Isaac; Mora-Cervetto, Alejandra; María Bermúdez-Martínez, Raquel

    2016-08-01

    Skipjack (Katsuwunus pelamis), yellow fin (Thunnus albacares) and albacore (Thunnus alulunga) tunas landed in the Eastern Pacific Ocean (EPO) countries and Ecuador were correlated to the Indexes Oceanic El Niño (ONI) and Multivariate Enso Index (MEI). The temporal series 1983-2012, and 1977-1999 (warm Pacific Decadal Oscillation, PDO), and 2000-2012 (cold PDO) were analyzed. Linear correlation showed that at least 11 % of the total landings were associated with the MEI, with a slightly negative gradient from cold to warm conditions. When non-linear regression (n = 6), the R2 was higher up to 0.304 (MEI, r = 0.551). The correlation shows high spread from -0.5 to +0.5 for both MEI/ONI; the highest landings occurred at 0.34-0.45; both indexes suggested that at extreme values 1.1 total landings tend to decrease. Landings were associated up to 21.9 % (MEI) in 2000-2012, 1983-1999 rendered lower R2 (EPO associated to oceanographic events of high and low frequencies could be used somehow as predictors of the high El Niño o La Niña. There is a clear evidence that tuna fish biomass are at higher levels when the PDO is on cold phase (2000-2030) and vice versa on warm phase (1980-1999). The analysis of the skipjack catch per unit effort (CPUE) on floating aggregating devices (FADs) suggests higher CPUE on FADs (around 20 mt set-1) when oceanographic indexes ONI/MEI are below -0.5. Findings of this work suggest that fishing and management of commercial fish must be analyzed under the light of oceanographic conditions.

  8. SEBARAN UKURAN PANJANG DAN NISBAH KELAMIN IKAN MADIDIHANG (Thunnus albacares DI SAMUDERA HINDIA BAGIAN TIMUR

    Directory of Open Access Journals (Sweden)

    Arief Wujdi

    2015-12-01

    Full Text Available Ikan madidihang atau tuna sirip kuning (Thunnus albacares merupakan salah satu komoditas penting bagi industri perikanan di Indonesia dengan hasil tangkapan tertinggi dibandingkan jenis tuna lainnya. Sebagai dasar pengelolaan sumberdaya ikan yang berkelanjutan, diperlukan data dan informasi tentang komposisi ukuran layak tangkap yaitu membandingkan proporsi rata-rata ikan tertangkap (Lc dan matang gonad (Lm, serta nisbah kelamin sebagai indikator pendugaan kemampuan memijah. Pengumpulan data dilakukanmelalui program observasi diatas kapal rawai tuna yang berbasis di Benoa, Pelabuhanratu dan Bungus dari bulan Agustus 2005 hingga November 2013. Penghitungan nisbah kelamin menggunakan uji Chi-Square (X2 dengan tingkat kepercayaan 95%. Hasil penelitian menunjukkan bahwa distribusi ukuran panjang cagak ikan madidihang berkisar antara 30-179 cm, modus ukuran 106-110 cm dan rata-rata 101,65 cm. Sebanyak 81,03% madidihang yang tertangkap berukuran lebih besar daripada Lm yang berarti telah layak tangkap. Nisbah kelamin betina:jantan adalah 1:1,45 mengindikasikan dominansi ikan jantan. Hubungan antara nisbah kelamin dengan panjang ikan menunjukkan signifikansi dimana ikan betina semakin berkurang pada ukuran 120-180 cm, serta tidak ditemukan lagi pada ukuran lebih dari 170 cm. Korelasi nisbah kelamin dan panjang cagak dapat dideskripsikan dengan persamaan regresi sebagai berikut: 1,8013 - 0,0099 FL dengan nilai R2=0,8058. Yellowfin tuna or YFT (Thunnus albacares is one of the important commodity for the fishing industry in Indonesia because it has the highest catches compared with other tunas. In order to fisheries resources management, it was necessary to monitor the size composition compared between proportion average size captured (Lc and maturity size (Lm to meets the size eligibility, as well as the sex ratio as an indicator to estimate the ability of spawn. Data collected by scientific observers program which was following tuna longline

  9. Abundance and Distribution Patterns of Thunnus albacares in Isla del Coco National Park through Predictive Habitat Suitability Models

    Science.gov (United States)

    Gonzáles-Andrés, Cristina; F. M. Lopes, Priscila; Cortés, Jorge; Sánchez-Lizaso, José Luis; Pennino, Maria Grazia

    2016-01-01

    Information on the distribution and habitat preferences of ecologically and commercially important species is essential for their management and protection. This is especially important as climate change, pollution, and overfishing change the structure and functioning of pelagic ecosystems. In this study, we used Bayesian hierarchical spatial-temporal models to map the Essential Fish Habitats of the Yellowfin tuna (Thunnus albacares) in the waters around Isla del Coco National Park, Pacific Costa Rica, based on independent underwater observations from 1993 to 2013. We assessed if observed changes in the distribution and abundance of this species are related with habitat characteristics, fishing intensity or more extreme climatic events, including the El Niño Southern Oscillation, and changes on the average sea surface temperature. Yellowfin tuna showed a decreasing abundance trend in the sampled period, whereas higher abundances were found in shallow and warmer waters, with high concentration of chlorophyll-a, and in surrounding seamounts. In addition, El Niño Southern Oscillation events did not seem to affect Yellowfin tuna distribution and abundance. Understanding the habitat preferences of this species, using approaches as the one developed here, may help design integrated programs for more efficient management of vulnerable species. PMID:27973538

  10. Abundance and Distribution Patterns of Thunnus albacares in Isla del Coco National Park through Predictive Habitat Suitability Models.

    Science.gov (United States)

    Gonzáles-Andrés, Cristina; F M Lopes, Priscila; Cortés, Jorge; Sánchez-Lizaso, José Luis; Pennino, Maria Grazia

    2016-01-01

    Information on the distribution and habitat preferences of ecologically and commercially important species is essential for their management and protection. This is especially important as climate change, pollution, and overfishing change the structure and functioning of pelagic ecosystems. In this study, we used Bayesian hierarchical spatial-temporal models to map the Essential Fish Habitats of the Yellowfin tuna (Thunnus albacares) in the waters around Isla del Coco National Park, Pacific Costa Rica, based on independent underwater observations from 1993 to 2013. We assessed if observed changes in the distribution and abundance of this species are related with habitat characteristics, fishing intensity or more extreme climatic events, including the El Niño Southern Oscillation, and changes on the average sea surface temperature. Yellowfin tuna showed a decreasing abundance trend in the sampled period, whereas higher abundances were found in shallow and warmer waters, with high concentration of chlorophyll-a, and in surrounding seamounts. In addition, El Niño Southern Oscillation events did not seem to affect Yellowfin tuna distribution and abundance. Understanding the habitat preferences of this species, using approaches as the one developed here, may help design integrated programs for more efficient management of vulnerable species.

  11. Comparative ecology of widely distributed pelagic fish species in the North Atlantic: Implications for modelling climate and fisheries impacts

    DEFF Research Database (Denmark)

    Trenkel, V.M.; Huse, G.; MacKenzie, Brian

    2014-01-01

    scombrus), capelin (Mallotus villosus), blue whiting (Micromesistius poutassou), and horse mackerel (Trachurus trachurus), which have distributions extending beyond the continental shelf and predominantly occur on both sides of the North Atlantic. We also include albacore (Thunnus alalunga), bluefin tuna...... (Thunnus thynnus), swordfish (Xiphias gladius), and blue marlin (Makaira nigricans), which, by contrast, show large-scale migrations at the basin scale. We focus on the links between life history processes and the environment, horizontal and vertical distribution, spatial structure and trophic role. Many...

  12. Changesin Myoglobin of Big Eye Tuna During Chilling Storage

    Directory of Open Access Journals (Sweden)

    Stevi Imelda Murniati Wodi

    2015-01-01

    Full Text Available Big eye tuna (Thunnus obesus is one of the species of tuna which is have some value added such as have potential to improve animal protein sources, have high economic values as well as an export commodity.Mishandling and misapplication of high temparatures on the tuna handling at the tropics and sub tropics climate was significantly decreasing the value of myoglobin and affecting the solubility of protein. Myoglobin is a globular protein that have small molecular weight size and it was an important factor for determining the quality of meat and influencing factors of purchasing power by the consumer. The purpose of this experiments is to determining the changes of myoglobin content and the water soluble proteins content at some parts of big eye tuna in 9 days chilling temperatures. The portion which is analized was the ventral area, dorsal area and tail area. Myoglobin content in all portion above, both light and dark meat was analized. The results shows the decreased value of myoglobin content from first handling (day zero until day ninth (days 9th experiment. Each myoglobin contentfrom white meat at at ventral, dorsal and tail meat was decreased from 121.68 mg/100 into 41.35 mg/100, 148.2 mg/100g into 52.01 mg/100g, 105.16 mg/100g into 31.34 gr/100gram, after day ninth. The myoglobin content from dark meat at ventral, dorsal and tail meat, was decreased, too ; from 418.64 mg/100 gr into 121.01 mg/100 g, 446.21 mg/100 g into 58.34 mg/100 r and 145.65 mg/100 gr into 87.98 mg/100g after day ninth.Water soluble protein was derived into protein bands with molecular weight 15,4 kDa and 14 kDa. Its suspected as the myoglobin protein. The molecular weight difference was caused from degradation of protein during the storage.Keywords: Big eye tuna, meat, storage, myoglobin

  13. Optimum soak time of tuna longline gear%金枪鱼延绳钓钓具的最适浸泡时间

    Institute of Scientific and Technical Information of China (English)

    宋利明; 徐伟云; 曹道梅; 赵昌克

    2013-01-01

      根据2010年10月—2011年1月金枪鱼延绳钓海上调查数据,分两种起绳方式,建立每次作业每一根支绳的浸泡时间计算模型.将钓具的浸泡时间以1 h 为间隔分别统计每个区间的支绳数量及大眼金枪鱼(Thunnus obesus)、黄鳍金枪鱼(Thunnus albacores)的渔获尾数,并计算其钓获率(CPUE).结果表明:1)大眼金枪鱼和黄鳍金枪鱼的CPUE 都随浸泡时间的增加呈现先增后减的趋势,这是由于饵料的诱引效果变化及渔获的丢失引起的;2)二次曲线可拟合浸泡时间与大眼金枪鱼和黄鳍金枪鱼 CPUE 的关系;3)大眼金枪鱼和黄鳍金枪鱼 CPUE 最高的浸泡时间分别为9.9 h 和10.1 h.建议:1)今后在金枪鱼延绳钓作业中,保证每一根支绳在水中的浸泡时间为9.5~10.5 h,以提高捕捞效率并减少副渔获物;2)可把延绳钓钓具的浸泡时间作为有效捕捞努力量,并用于 CPUE 的标准化.研究结果可用于提高捕捞效率并减少副渔获物的技术方案制订,并为渔业生产和 CPUE 的标准化提供科学参考.%On the basis of the data collected from October 2010 to January 2011 in the tuna longline survey, the soak time calculation models of every branch line in each operation were developed by both modes of hook re-trieval. The soak time of longline gear divided into one hour interval for the quantity of hooks and the individuals of bigeye tuna (Thunnus obesus) and yellowfin tuna (Thunnus albacores), respectively. The respective catch rates (CPUEs) of bigeye tuna and yellowfin tuna in each hour interval were calculated. The results showed that (1) both CPUE of bigeye tuna and yellowfin tuna presented increasing at first and then decreasing trend along the increase of soak time. The reason was the lure effect fluctuation of bait and the lose of hooked fish; (2) the quadratic curves can be fit the relationships between soak time and the CPUE of bigeye tuna, and yellowfin tuna; (3) the CPUE of

  14. 77 FR 74612 - Atlantic Highly Migratory Species; Atlantic Bluefin Tuna Fisheries

    Science.gov (United States)

    2012-12-17

    ... the fishery management plan; variations in seasonal distribution, abundance, or migration patterns of... equitable distribution of fishing opportunities, a retention limit closer to the low end of the allowable.... quota of BFT without exceeding it, while maintaining an equitable distribution of fishing...

  15. Impending collapse of bluefin tuna in the northeast Atlantic and Mediterranean

    DEFF Research Database (Denmark)

    MacKenzie, Brian; Mosegaard, Henrik; Rosenberg, Andrew A.

    2009-01-01

    of older fish and repeat spawners in population) indicate that buffering capacity against years of poor reproduction has been reduced. This population is at risk of collapse (90% decline in adult biomass within three generations, the criterion used by the IUCN for defining populations as Critically...... Endangered), even under the currently agreed recovery plan, unless new conservation measures are implemented in the next few years....

  16. The oxidative stability of chilled and frozen pilchards used as feed for captive southern bluefin tuna

    DEFF Research Database (Denmark)

    Fitz-Gerald, C.H.; Bremner, Allan

    1998-01-01

    Freshly caught pilchards (Sardinops neopilchardus) were obtained from South Australia and subjected to chilled and frozen storage trials in order to determine their stability. The stability was gauged by visual and sensory assessment of the raw pilchards, by sensory assessment of the odour...... obvious deterioration within two days. Substantial peroxide values were found and oxidised odours and flavours were clearly evident after 4 days' chilled storage. In frozen storage, oxidation occurred after only one month at a temperature of -20°C. This could be delayed if the fish were glazed with water....... Vacuum packaging in a film of low permeability to oxygen was less effective than glazing and is not recommended due to cost. Pilchards in which oxidation had commenced before freezing continued to oxidise in frozen storage irrespective of whether they were glazed or vacuum packed. It was thus thoroughly...

  17. 78 FR 36685 - Atlantic Highly Migratory Species; 2013 Atlantic Bluefin Tuna Quota Specifications

    Science.gov (United States)

    2013-06-19

    ... discard estimate used to set the specifications is wrong, especially if it is too high and as a result the... the Federal Register, emailing individuals who have subscribed to the Atlantic HMS News...

  18. 76 FR 32086 - Atlantic Highly Migratory Species; Atlantic Bluefin Tuna Fisheries

    Science.gov (United States)

    2011-06-03

    ... Mexico, and applies to those vessels permitted in the General category, as well as to those HMS Charter... than the default retention limit of one BFT per day/trip and may exacerbate the problem of low catch... social and economic impacts for U.S. fishermen who depend upon catching the available quota within...

  19. 75 FR 79309 - Atlantic Highly Migratory Species; Atlantic Bluefin Tuna Fisheries

    Science.gov (United States)

    2010-12-20

    ... landing. This General category retention limit is effective in all areas, except for the Gulf of Mexico... retention limit of one BFT per day and may exacerbate the problem of low catch rates and quota rollovers. Limited opportunities to harvest the respective quotas may have negative social and economic impacts for...

  20. 78 FR 77362 - Atlantic Highly Migratory Species; Atlantic Bluefin Tuna Fisheries

    Science.gov (United States)

    2013-12-23

    ... of Mexico, and applies to those vessels permitted in the General category, as well as to those HMS... of one BFT per day/trip and may exacerbate the problem of low catch rates and of quota rolling from... social and economic impacts for U.S. fishermen that depend upon catching the available quota within...

  1. 76 FR 52886 - Atlantic Highly Migratory Species; Atlantic Bluefin Tuna Fisheries

    Science.gov (United States)

    2011-08-24

    ... category retention limit is effective in all areas, except for the Gulf of Mexico, and applies to vessels... more than the default retention limit of one BFT per day/trip and may exacerbate the problem of low... negative social and economic impacts for U.S. fishermen who depend upon catching the available quota...

  2. 77 FR 44161 - Atlantic Highly Migratory Species; 2012 Atlantic Bluefin Tuna Quota Specifications

    Science.gov (United States)

    2012-07-27

    ... the effects of the Deepwater Horizon/BP oil spill and the effects of mixing of eastern and western BFT..._final.pdf ) the Team modeled the potential effect of the Deepwater Horizon/BP oil spill on the future... to be the best scientific information of the effect of the Deepwater Horizon/BP oil spill on...

  3. 76 FR 74003 - Atlantic Highly Migratory Species; Adjustments to the Atlantic Bluefin Tuna General and Harpoon...

    Science.gov (United States)

    2011-11-30

    ... publication of new research. NMFS delayed issuing a final rule pending a new ICCAT BFT stock assessment and... high stock recruitment scenarios considered by ICCAT's Standing Committee on Research and Statistics... alternative (B2b) provides additional fishing opportunities within available quotas while acknowledging...

  4. Preliminary forecasts of Pacific bigeye tuna population trends under the A2 IPCC scenario

    Science.gov (United States)

    Lehodey, P.; Senina, I.; Sibert, J.; Bopp, L.; Calmettes, B.; Hampton, J.; Murtugudde, R.

    2010-07-01

    An improved version of the spatial ecosystem and population dynamics model SEAPODYM was used to investigate the potential impacts of global warming on tuna populations. The model included an enhanced definition of habitat indices, movements, and accessibility of tuna predators to different vertically migrant and non-migrant micronekton functional groups. The simulations covered the Pacific basin (model domain) at a 2° × 2° geographic resolution. The structure of the model allows an evaluation from multiple data sources, and parameterization can be optimized by adjoint techniques and maximum likelihood using fishing data. A first such optimized parameterization was obtained for bigeye tuna ( Thunnus obesus) in the Pacific Ocean using historical catch data for the last 50 years and a hindcast from a coupled physical-biogeochemical model driven by the NCEP atmospheric reanalysis. The parameterization provided very plausible biological parameter values and a good fit to fishing data from the different fisheries, both within and outside the time period used for optimization. We then employed this model to forecast the future of bigeye tuna populations in the Pacific Ocean. The simulation was driven by the physical-biogeochemical fields predicted from a global marine biogeochemistry - climate simulation. This global simulation was performed with the IPSL climate model version 4 (IPSL-CM4) coupled to the oceanic biogeochemical model PISCES and forced by atmospheric CO 2, from historical records over 1860-2000, and under the SRES A2 IPCC scenario for the 21st century (i.e. atmospheric CO 2 concentration reaching 850 ppm in the year 2100). Potential future changes in distribution and abundance under the IPCC scenario are presented but without taking into account any fishing effort. The simulation showed an improvement in bigeye tuna spawning habitat both in subtropical latitudes and in the eastern tropical Pacific (ETP) where the surface temperature becomes optimal for

  5. Food-web inferences of stable isotope spatial patterns in copepods and yellowfin tuna in the pelagic eastern Pacific Ocean

    Science.gov (United States)

    Olson, Robert J.; Popp, Brian N.; Graham, Brittany S.; López-Ibarra, Gladis A.; Galván-Magaña, Felipe; Lennert-Cody, Cleridy E.; Bocanegra-Castillo, Noemi; Wallsgrove, Natalie J.; Gier, Elizabeth; Alatorre-Ramírez, Vanessa; Ballance, Lisa T.; Fry, Brian

    2010-07-01

    Evaluating the impacts of climate and fishing on oceanic ecosystems requires an improved understanding of the trophodynamics of pelagic food webs. Our approach was to examine broad-scale spatial relationships among the stable N isotope values of copepods and yellowfin tuna ( Thunnus albacares), and to quantify yellowfin tuna trophic status in the food web based on stable-isotope and stomach-contents analyses. Using a generalized additive model fitted to abundance-weighted-average δ 15N values of several omnivorous copepod species, we examined isotopic spatial relationships among yellowfin tuna and copepods. We found a broad-scale, uniform gradient in δ 15N values of copepods increasing from south to north in a region encompassing the eastern Pacific warm pool and parts of several current systems. Over the same region, a similar trend was observed for the δ 15N values in the white muscle of yellowfin tuna caught by the purse-seine fishery, implying limited movement behavior. Assuming the omnivorous copepods represent a proxy for the δ 15N values at the base of the food web, the isotopic difference between these two taxa, “ ΔYFT-COP,” was interpreted as a trophic-position offset. Yellowfin tuna trophic-position estimates based on their bulk δ 15N values were not significantly different than independent estimates based on stomach contents, but are sensitive to errors in the trophic enrichment factor and the trophic position of copepods. An apparent inshore-offshore, east to west gradient in yellowfin tuna trophic position was corroborated using compound-specific isotope analysis of amino acids conducted on a subset of samples. The gradient was not explained by the distribution of yellowfin tuna of different sizes, by seasonal variability at the base of the food web, or by known ambit distances (i.e. movements). Yellowfin tuna stomach contents did not show a regular inshore-offshore gradient in trophic position during 2003-2005, but the trophic

  6. THE EFFECT OF DEPTH OF HOOKS, SET AND SOAK TIME TO THE CATCH PER UNIT OF EFFORT OF TUNA IN THE EASTERN INDIAN OCEAN

    Directory of Open Access Journals (Sweden)

    Bram Setyadji

    2017-01-01

    Full Text Available Yellowfin (Thunnus albacares and bigeye (T. obesus tuna have been intensively exploited by longline fleets since 1980’s, however, a large proportion of zero catch per set of target species still accurred. Zero catch data contributed significantly to the low catch per unit of effort (CPUE compared to other countries at the same fishing area. Therefore, understanding the factors contributed to the CPUE of tuna is essential, in order to improve longline fishing efficiency. A total of 2.115 set-by-set data were obtained from Indonesian Scientific Observer Program. The onboard observations were carried out at commercial tuna longline operated in Eastern Indian Ocean from August 2005 to December 2014. Several analytical approaches were conducted in this paper. First, General Linear Model (GLM was applied in order to model the relationship between CPUE with all the variables involved. Second, boxplot diagram, polynomial and linear regression were applied to fit the relationship between CPUE with set time, soak time and depth (represented by hook position respectively. The result showed that, there was no significant relationship between set time and CPUE of bigeye and yellowfin tuna. Soak time was positively related with CPUE of yellowfin and affect adversely on bigeye. Depth also have significant relationship with CPUE of tuna, where catch of yellowfin decreased linearly with hook depth, whereas catch of bigeye was performed the opposite. Improvement in tuna longline fishery in eastern Indian Ocean can be achieved through implementation of the specific soak time and hook depth for each target species, i.e. yellowfin and bigeye tuna.

  7. 大西洋中部金枪鱼延绳钓性能评估初步研究%A preliminary study on tuna long-line performance in central Atlantic Ocean

    Institute of Scientific and Technical Information of China (English)

    李灵智; 黄洪亮; 刘健; 王磊; 徐国栋; 陈帅

    2012-01-01

    According to the tuna long-line fishery data in central Atlantic Ocean in 2009 and 2010, the selectivity and performance of tuna long-line was analyzed. The results showed that : the tuna lone-line fishing gear had a good species selectivity, the big-eye tuna (Thunnus obesus ) catches and number accounted for 73.67% and 76.00% of the total catches respectively; the larva number proportion of big-eye tuna, yellowfin tuna ( Thunnus albacares ) and swordfish (Xiphias gladius ) were 13. 00%, 25. 97% and 48. 93% respectively; from No. 1 to No. 6 hook, the catch rate of big-eye tuna rose with the increases of hook depth, a slightly decline trend was found from No. 6 to No. 8 hook, the maximum catch rate was 9.46 ind/1000 hooks in No. 6 hook ; the catch rate of No. 3 to No. 8 hook were all more than 7 ind/1000 hooks, which indicated that the utilization rate of No. 1 and No. 2 hook was lower; based on the theory depth of hooks, the mainly distributed water layer of big eye tuna would be 220m - 350m. By adjusting the sag ratio and optimizing the float rope length of tuna lone-line, the hook depth would be closer to the big-eye tuna distribution water layer, which can increase utilization rate of hooks.%利用2009~2010年我国大西洋中部金枪鱼延绳钓调查数据,对金枪鱼延绳钓钓具性能进行评估。结果表明:金枪鱼延绳钓具有较好的种类选择性,大眼金枪鱼渔获量和尾数分别占总渔获量的73.67%和76.00%;大眼金枪鱼(Thunnus obesus)、黄鳍金枪鱼(Thunnus albacares)和剑鱼(Xiphias gladius)未达到性成熟的渔获尾数比例分别为13.00%、25.97%和48.93%;1—6号钓钩,大眼金枪鱼上钩率随钓钩深度增加呈递增趋势,6—8号钓钩上钩率呈递减趋势,6号钓钩上钩率最大为9.46尾/千钩;3号至8号钓钩上钩率均大于7尾/千钩,表明1号和2号钓钩利用率偏低;根据钓钩理论深度,推测大眼金

  8. Aasta esimene Tuna / Vello Helk

    Index Scriptorium Estoniae

    Helk, Vello, 1923-2014

    2009-01-01

    ajakiri Tuna, 2009, nr. 1 sisust: Mait Kõivu Trooja sõja aineline essee, Tiina Kala Saare-Lääne piiskopi Johannes Kiveli ametissepühitsemine 1515. aastal, Jaan Rossi artikkel teadlaste panusest muusikasse, Riho Saardi Eesti Kirikute Nõukogu sünnilugu, Vello Salo 1924. aasta 1. detsembri lööksalkade juhtkonnast

  9. Aleksander Loit - Tuna laureaat 2010

    Index Scriptorium Estoniae

    2010-01-01

    "Tuna" seitsmendast artklipreemiast. Esimest korda läks preemia väljapoole Eestit. Preemia vääriliseks osutus Aleksander Loidi artikkel "Appihüüd põrgust. Ümberpiiratud Tallinna viimased päevad Rootsi võimu all 2010"

  10. Value Chain Model Development of Tuna and Tuna Alike In Indonesia

    Directory of Open Access Journals (Sweden)

    Ateng Supriatna

    2014-11-01

    Full Text Available Sustainability of tuna and tuna alike fisheries depend on chain value system formed by stakeholders ranging from product fishing, processing/diversification, distribution, and marketing. The objective of this research was to create chain value system model of tuna and tuna alike fisheries, to predict the interaction pattern of stakeholders and to formulate the precise strategy to minimize the synergy resistance of chain value system development strategy of tuna and tuna alike fisheries. Structural Equation Modelling (SEM was applied to analyze the chain value model. The stakeholders/the players of tuna and tuna alike fisheries basically have positive interaction (CE>0.The negative interaction occured on retailers and consumers. Interaction of retailers with consumers is significant (p<0.05 0.01. Interaction pattern of fishermen, retailers, collectors, and exporters affected significantlly by pricing and the level of role played by the stakeholders. The strategy to minimize the sinergy resistance of chain value system development are respectivelly the strategy of involving the group of fishermen on products pricing (CE= 1,176 and P= 0,000, the strategy of involving the seller groups on products pricing (CE-PE=1,08, CE-PB= 0,766, CE EKS= 2,028 AND P= 0,000, and the strategy on guaranteeing flexible interaction between retailer and consumers (CE= 0,179 and p = 0,01.Keywords: tuna and tuna alike, interaction, tuna and tuna alike stakeholders, and value chain

  11. A continuous time delay-difference type model (CTDDM) applied to stock assessment of the southern Atlantic albacore Thunnus alalunga

    Science.gov (United States)

    Liao, Baochao; Liu, Qun; Zhang, Kui; Baset, Abdul; Memon, Aamir Mahmood; Memon, Khadim Hussain; Han, Yanan

    2016-09-01

    A continuous time delay-diff erence model (CTDDM) has been established that considers continuous time delays of biological processes. The southern Atlantic albacore ( Thunnus alalunga) stock is the one of the commercially important tuna population in the marine world. The age structured production model (ASPM) and the surplus production model (SPM) have already been used to assess the albacore stock. However, the ASPM requires detailed biological information and the SPM lacks the biological realism. In this study, we focus on applying a CTDDM to the southern Atlantic albacore ( T. alalunga) species, which provides an alternative method to assess this fishery. It is the first time that CTDDM has been provided for assessing the Atlantic albacore ( T. alalunga) fishery. CTDDM obtained the 80% confidence interval of MSY (maximum sustainable yield) of (21 510 t, 23 118t). The catch in 2011 (24 100 t) is higher than the MSY values and the relative fishing mortality ratio ( F 2011/ F MSY) is higher than 1.0. The results of CTDDM were analyzed to verify the proposed methodology and provide reference information for the sustainable management of the southern Atlantic albacore stock. The CTDDM treats the recruitment, the growth, and the mortality rates as all varying continuously over time and fills gaps between ASPM and SPM in this stock assessment.

  12. Determination and quantification of PCBs, POCs and PAHs in Thunnus thynnus from the Straits of Messina (Italy)

    Science.gov (United States)

    Saija, Emanuele; Mangano, Valentina; Casale, Katia Ermina; La Torre, Giovanna Loredana; Dugo, Giacomo; Salvo, Andrea

    2016-01-01

    This data set is composed to assess the accumulation of persistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs) dioxin like (DL) and not dioxin like (NDL), organochlorine pesticides (POCs) and polycyclic aromatic hydrocarbons (PAHs) in Thunnus thynnus and to elucidate the suitability of this species as a bioindicator for monitoring contaminations of these compounds in the marine ecosystems of the Straits of Messina. This investigation was conducted on liver samples of 14 T. thynnus collected during April 2015. Quantitative determination of PCBs (DL and NDL), POCs and PAHs in the examined samples has been carried out by HRGC-MS/MS. Among the PCBs, high prevalence of DL was found while, generally, the values detected for PCBs–NDL were lower than the legal limits. Tuna samples analyzed for PAHs residues revealed that all the samples were contaminated with acenaphthalene, fluorene, phenanthrene and anthracene. Moreover, generally the residual levels of DDT and DDT metabolites were low. The total content of PCB–DL, in almost all the samples, showed higher concentration than the legal limit. PMID:26933670

  13. [Fatty acid composition and cholesterol content in naturally canned jurel, sardine, salmon, and tuna].

    Science.gov (United States)

    Romero, N; Robert, P; Masson, L; Luck, C; Buschmann, L

    1996-03-01

    To obtain more information about fatty acid profile and cholesterol content of fat extracted from canned fish in brine habitually consumed in Chile, four different species Jurel (Trachurus murphyi), Sardine (Sardinops sagax), Salmon (Oncorhynchus kisutch) and Tuna (Thunnus alalunga) were analyzed. The GLC of fatty acid methyl esters showed that the main group of fatty acids belongs to polyunsaturated, being omega-3 family the more important. The principal representants were eicosapentaenoic (EPA) and docosahexaenoic acids (DHA), with percentages between 5%-11% and 12%-22% respectively. Omega-6 family was represented mainly by arachidonic acid (AA) with percentages between 2%-4%. Cholesterol content was similar to the values found in other animal origen meats. The figures were between 41-86 mg of cholesterol per 100 g of edible product, Tuna in brine, was the product with the lowest content of cholesterol. The calculated amount of EPA, DHA and total omega-3 fatty acids indicated values between 95-604, 390-1163 and 609-2775 mg respectively per 100 g of edible product. Due these results is important to emphasize the consumption of this type of canned fish in brine, that they really represent a good dietary source of mainly polyunsaturated omega-3 fatty acids. The international recommendations indicate to increase the consumption of fish, due the beneficial effects described in relation with cardiovascular disease, which is the mean cause of death in Chile, country with a wide variety of marine origen foods, but with a contradictory answer about its consumption which is not incorporated in the current diet.

  14. No evidence for homeoviscous adaptation in a heterothermic tissue: tuna heat exchangers.

    Science.gov (United States)

    Fudge, D S; Stevens, E D; Ballantyne, J S

    1998-09-01

    Many poikilotherms are known to adjust the membrane composition of their cells in response to a temperature change so that membrane fluidity, and therefore function, is conserved. Such compensatory changes in membrane composition are considered "homeoviscous adaptations." In this study, we examined a heterothermic tissue, the visceral rete mirabile of the bluefin tuna, for evidence of homeoviscous adaptation. We measured the proportions of phospholipid fatty acids and phospholipid head groups as a function of position along the rete thermal gradient, which has been estimated to be approximately 10 degrees C. We found no effect of position along the rete on the composition of either phospholipid fatty acids or head groups. Our results were unexpected in light of our previous demonstration of compensation of metabolic enzyme activity in the same tissue. The lack of evidence for a homeoviscous response may be due to the fluctuating nature of the thermal gradient along the visceral retia; i.e., membranes may be adapted to a eurythermal existence rather than being fine-tuned to a particular temperature.

  15. 76 FR 2313 - Atlantic Highly Migratory Species; Bluefin Tuna Bycatch Reduction in the Gulf of Mexico Pelagic...

    Science.gov (United States)

    2011-01-13

    ... FMP (74 FR 28018, June 12, 2009), which revised HMS Essential Fish Habitat and designated a new... available, at this time, to demonstrate any specific effects of the Deepwater Horizon/BP oil spill on the... oxygen and the inter- related effects that culminate and magnify through the food web could lead...

  16. 76 FR 18653 - Atlantic Highly Migratory Species; Bluefin Tuna Bycatch Reduction in the Gulf of Mexico Pelagic...

    Science.gov (United States)

    2011-04-05

    ... beneficial impacts on the stock status of Atlantic BFT, an overfished species. This action affects commercial... hooks relatively quickly after being caught and likely do not incur as high a level of metabolic stress... have found that fishermen participating in research tend to work through a learning curve with...

  17. BIOLOGY AND DISTRIBUTION OF THUNNUS OBESUS AND THUNNUS ALBACRES IN THE SOUTH CHINA SEA%南海大眼金枪鱼和黄鳍金枪鱼生物学特性及其分布

    Institute of Scientific and Technical Information of China (English)

    冯波; 李忠炉; 侯刚

    2014-01-01

    We conducted a longline fishing and operation survey in the South China Sea from March 2010 to February 2013,during which biology and fishing ground of large tuna were studied to understand the current tuna stock in the region.Statistical study with SPSS shows that,for Thunnus obesus,the mean fork length was 111.8 cm in a range of 50-169 cm and mean weight 33.2kg in a range of 2.45-87kg.The relationship between fork length (FL) and weight (W) can be expressed by W=1.74× 10-5FL3.01.Maturity at Ⅱ of the gonad was dominant up to 45.27%.The absolute fecundity was 10.95 to 45.7 million eggs.Feeding intensity was mainly in the class 0 to 2,occupied 77.08%.In spring and summer,the longline fishing grounds for T.obesus were located in the northwestern and central western Nansha waters,while in fall and winter,in Xisha,Zhongsha,and the northwestern Nansha waters.An amount of 90% catch Was from 150 to 400m water layers.For Thunnus albacres,the mean fork length was 107.9cm in a range of 41-180cm,mean weight 27.9kg in range of 1.2-77.5kg.The relationship between fork length and weight can be calculated by W=2.19× 10-5FL2.94.Maturity at Ⅱ to Ⅳ of the gonad was dominant up to 89.01%.The absolute fecundity was 1.5 to 15.4 million eggs.Feeding intensity was mainly in the class 1 to 2,occupied 63.73%.In spring and summer,the longline fishing grounds for T.albacres were located in the northwestern and central western Nansha waters,while in fall and winter,in Xisha,Zhongsha,and the northwestern and central western Nansha waters.An amount of 93.75% catch was from 50 to 350m water layers.The important tuna fishing ground for light purse seine and light falling net distributed in the western Xisha and northwestern Nansha waters.Therefore,we suggest (1) to build cooling sea-water longliners and to shoot shallow longline in the northeastern Xisha waters from August to May,(2) to carry falling net fishing or seine pursing with payaos near islands in the South China Sea

  18. 78 FR 65887 - International Fisheries; Pacific Tuna Fisheries; 2013 Bigeye Tuna Longline Fishery Closure in the...

    Science.gov (United States)

    2013-11-04

    ... National Oceanic and Atmospheric Administration 50 CFR Part 300 RIN 0648-XC922 International Fisheries; Pacific Tuna Fisheries; 2013 Bigeye Tuna Longline Fishery Closure in the Eastern Pacific Ocean AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA),...

  19. Challenging the knowledge bio-based fisheries of tropical tuna stocks: assessing genomic population structure in yellowfin (Thunnus albacares

    Directory of Open Access Journals (Sweden)

    Carlo Pecoraro

    2014-06-01

    The YFT genetic population structure will be investigated at global scale (between- and within-ocean, using next-generation sequencing (2b-RAD method for genotyping by sequencing through examination of Single Nucleotide Polymorphisms (SNPs. This approach can represent a major advancement over classical techniques used until now (i.e. based on allozymes, DNA microsatellites and mitochondrial DNA in order to reveal the YFT stock structure between and within each ocean. The novel genomic data that will be generated can potentially reveal YFT population structure at a level not possible through classical latter approaches with significant implication for YFT stock assessment and management. In fact a carelessness of the proper genetic structure might lead to the over-exploitation and depletion of some populations with dramatic consequences for the long-term conservation and sustainable use of YFT stocks.

  20. Histamine development and bacterial diversity in microbially-challenged tonggol (Thunnus tonggol) under temperature abuse during canning manufacture.

    Science.gov (United States)

    Hongpattarakere, Tipparat; Buntin, Nirunya; Nuylert, Aem

    2016-01-01

    Histamine formation and bacteriological changes caused by temperature abuse commonly occurring in the manufacturing process of standard canned tuna was assessed in microbiologically challenged tonggol (Thunnus tonggol). The in situ challenge was performed by water-soaking at 26-28 °C for 7 h to ensure the multiplication and active phase of fish microflora. Right after pre-cooking to back-bone temperature (BBT) of 50-52 °C, histamine dropped to 5.17 ± 2.71 ppm, and slowly reached 6.84 ± 1.69 ppm at 16 h abuse. On the contrary, histamine was reduced to 2.87 ± 1.23 ppm and eventually reached 5.01 ± 1.32 ppm at 24 h abuse in the pre-cooked fish previously frozen. The numbers of total aerobic bacteria, Enterobactericeae, psychrotroph, histamine forming bacteria (HFB) and diversity of fish microflora were revealed by cultural and nested PCR-Denaturing Gradient Gel Electrophoresis (PCR-DGGE) techniques. Interestingly, frozen storage effectively halted histamine formation in raw fish throughout 16 h abuse despite the presence of HFB. These included the prolific strains of Morganella morganii, Proteus penneri, Proteus mirabilin, Citrobacter spp. The nested PCR-DGGE profile confirmed the presence of M. morganii and Citrobacter spp. in raw fish. These prolific strains were hardly observed in the precooked fish previously frozen. Frozen storage did not only promote even histamine distribution throughout fish muscle but also enhanced histamine loss during thawing and pre-cooking. Therefore, pre-cooking and frozen storage were proven to be the effective combined hurdles not only to reduce but also prolong histamine formation of the challenged toggol throughout 24 h of temperature abuse during canning process.

  1. Global integration of European tuna markets

    Science.gov (United States)

    Jiménez-Toribio, Ramòn; Guillotreau, Patrice; Mongruel, Rémi

    2010-07-01

    This paper evaluates the degree of integration between the world market and the major European marketplaces of frozen and canned tuna through both vertical and horizontal price relationships. Spatial linkages are investigated horizontally in order to estimate the connection between the European market and the world-wide market on the primary stage of the value chain. One of the key results is the high level of market integration at the ex-vessel stage, and the price leadership of yellowfin tuna over skipjack tuna. The same approach is applied at the ex-factory level. Basically, the European market for final goods appears to be segmented between the Northern countries consuming low-priced canned skipjack tuna imported from Asia (mainly Thailand) and the Southern countries (Italy, Spain) processing and importing yellowfin-based products sold at higher prices. France appears to be an intermediate market where both products are consumed. The former market is found to be well integrated to the world market and can be considered to be competitive, but there is a suspicion of market power being exercised on the latter. Price relationships are therefore tested vertically between the price of frozen tuna paid by the canneries and the price of canned fish in both Italy and France. The two species show an opposite pattern in prices transmission along the value chain: price changes along the chain are far better transmitted for the “global” skipjack tuna than for the more “European” yellowfin tuna. The results are discussed, along with their implications for the fishing industry.

  2. MATERIAL BIOKERAMIK BERBASIS HIDROKSIAPATIT TULANG IKAN TUNA

    Directory of Open Access Journals (Sweden)

    Bambang - Riyanto

    2014-06-01

    Full Text Available Material biokeramik berbasis hidroksiapatit memiliki prospek baru dalam industri elektronika danmikroteknologi masa depan. Hidroksiapatit dengan sumber bahan baku alami merupakan potensi besar,terlebih pemanfaatan limbah tulang ikan tuna yang masih belum dilakukan dengan baik. Teknologi sintesisyang ada juga belum efektif serta karakterisasi materialnya belum banyak dikembangkan. Penelitianini bertujuan mensintesis dan mengetahui karakteristik material biokeramik berbasis hidroksiapatittulang ikan tuna. Metode yang digunakan dalam pengekstraksian hidroksiapatit tulang ikan tuna adalahdengan pemanasan suhu tinggi (sintering. Melalui suhu sintering 700ºC telah dapat dihasilkan materialbiokeramik berbasis hidroksiapatit dari tulang ikan tuna dengan rendemen tertinggi (65,61±2,21% danberwarna putih. Semakin tinggi suhu sintering, semakin tinggi derajat kristalinitasnya, sedangkan denganSEM memperlihatkan partikel penyusunnya berukuran 0,050 μm sampai 0,803 μm dan menyerupaibentuk kristal heksagonal. Nilai kapasitansi mengalami penurunan dengan bertambahnya frekuensi yangdiberikan, dengan nilai tertinggi 0,0061 nF, sedangkan nilai konduktivitas mengalami kenaikan seiringdengan bertambahnya frekuensi dengan nilai terendah 7,73 x 10-5 S/m.Kata kunci: biokeramik, hidroksiapatit, sintering, tulang ikan tuna

  3. 提取黄鳍金枪鱼眼窝肉鱼油的方法比较研究%Comparison of different methods of fish oil extraction from yellowfin tuna orbital meat

    Institute of Scientific and Technical Information of China (English)

    陶宁萍; 周敏; 王锡昌

    2011-01-01

    以黄鳍金枪鱼(Thunnus albacores 眼窝肉为研究对象,采用隔水蒸煮法、酶解法、碱水解法和超临界CO2(SC-CO2)萃取法提取鱼油,对所得鱼油的理化性质和脂肪酸组成进行分析测定.结果表明:SC-CO2萃取法和酶解法提取率无显著性差异,但明显高于隔水蒸煮法和碱水解法;SC-CO2萃取法获得的鱼油达到我国水产行业SC/T 3502-2000精制鱼油一级标准,其他3种方法达到SC/T 3502-2000粗鱼油二级标准;SC-CO2 萃取法提取的鱼油不饱和脂肪酸含量最高(74.29%),其中含EPA 5.99%、DHA 27.12%.因此,SC-CO2 较其他3种方法提取金枪鱼眼窝肉中鱼油具有显著优势.%Water bath, enzymatic hydrolysis, alkaline hydrolysis and supercritical carbon dioxide (SC -CO2 ) methods were used to extract fish oil from the yellowfin tuna ( Thunnus albacores) orbital meat. The physicochemical properties and fatty acids of unrefined tuna orbital oil were analyzed. The results showed that there was no significant difference between SC -CO2 method and enzymatic hydrolysis method in the oil extraction yield, however, their oil extraction yield were obviously higher than those extracted by water bath and alkaline hydrolysis. The physicochemical properties of tuna orbital oil extracted by SC - CO2 met with the first grade of refined fish oil in China standard ( SC/T 3502 - 2000) , while those extracted by the other three methods met with the secondary grade of unrefined fish oil. The tuna orbital oil extracted by SC- CO2 contained the highest amount of unsaturated fatty acids (74.29%), of which, EPA and DHA were 5.99% and 27.12%, respectively. In general ,the SC -CO2 had obvious superiority in extraction of tuna orbital oil.

  4. Kounis syndrome following canned tuna fish ingestion.

    Science.gov (United States)

    De Gennaro, Luisa; Brunetti, Natale Daniele; Locuratolo, Nicola; Ruggiero, Massimo; Resta, Manuela; Diaferia, Giuseppe; Rana, Michele; Caldarola, Pasquale

    2016-12-20

    Kounis syndrome (KS) is a complex of cardiovascular symptoms and signs following either allergy or hypersensitivity and anaphylactic or anaphylactoid insults. We report the case of 57-year-old man, with hypertension and history of allergy, referred for facial rash and palpitations appeared after consumption of canned tuna fish. Suddenly, the patient collapsed: electrocardiogram showed ST-elevation in inferior leads. The patient was transferred from the spoke emergency room for coronary angio, which did not show any sign of coronary atherosclerosis. A transient coronary spasm was therefore hypothesized and the final diagnosis was KS. To the best of our knowledge, this is one of the first cases of KS following the ingestion of tuna fish. KS secondary to food allergy has also been reported, and shellfish ingestion has been considered as one of the most active KS inducer foods. Canned tuna fish too is well known as an allergy inducer. Tuna fish allergy should be considered, however, within the context of scombroid food poisoning, also called histamine fish poisoning. Fish with high levels of free histidine, the enzyme substrate converted to histamine by bacterial histidine decarboxylase, are those most often implicated in scombroid poisoning. Inflammatory mediators such as histamine constitute the pathophysiologic basis of Kounis hypersensitivity-associated acute coronary syndrome. Patients with coronary risk factors, allergic reaction after food ingestion, and suspected scombroid poisoning should be therefore carefully monitored for a prompt diagnosis of possible coronary complications.

  5. PENANGKAPAN JUVENIL IKAN MADIDIHANG (Thunnus albacares Bonnatere 1788 DI PERAIRAN TELUK TOMINI

    Directory of Open Access Journals (Sweden)

    Siti Mardlijah

    2016-03-01

    The high intensity of juvenils yellowfin tuna (Thunuus albacares in Tomini bay has occurred after purse seine operated in this area. The aim of the research on “Exploitation of juvenile yellowfin tuna  in Tomini Bay”  was to give clear feature on yellowfin tuna juvenile exploitation by hand line and purse seine in Tomini Bay. The research was conducted in 2007 and 2010. All samples of yellow fin tuna were caught by hand line and purse seine which were operated in Tomini Bay. The result showed that juvenile yellowfin tuna were caught by hand line was about 88.11% from the total catch of hand line, while the juvenile yellowfin tuna caught by purse seine was 100%.  Length of first captune of yellowfin tuna by handline and purse seine was 31.6 cm FL and 30 cm. Fishing juvenile yellowfin tuna occurs every month.  Moreover, that condition was showing and giving the indication that the exploitation of juvenile yellowfin tuna was very high that may endanger their sustainability.

  6. Anti-inflammatory activity of the glandular extracts ofThunnus alalunga

    Institute of Scientific and Technical Information of China (English)

    A.K. Azeem; C Dilip; S S Prasanth; V Junise Hanan Shahima; Kumsr Sajeev; C. Naseera

    2010-01-01

    Objective:To evaluate the anti-inflamattory activity ofThunnus alalunga by bothin vitro and in vivomethods.Methods: Anti-inflammatory activity of the chloroform water extract ofThunnus alalunga was done by both in vitro andin vivo methods.In vitro method was done by human red blood cells membrane stabilization method(HRBC).In vivoevaluation was estimated on Wister albino rats. Acute toxicity studies were done on the extract and no toxicity was reported.Results:The percentage protection exhibited by 300 mg/mL concentration was more when compared to the other ones. The400 mg/mL concentration showed potent activity on comparison with the standard during in vivo evaluation.Conclusions: In both means of estimation the extract ofThunnus alalunga was found to possess significant anti-inflammatory activity.

  7. Detection Tuna and Processed Products Based Protein and DNA Barcoding

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    Nuring Wulansari

    2015-11-01

    Full Text Available Tuna is the second largest fishery commodity in Indonesia after the shrimp. Since the high demand and the limited stock of tuna resulted in fraudulent chance. Authentication is required to meassure consumers regarding the accuracy of its labeling and food safety. In this study, the authentication was based on protein and DNA barcoding using cytochrome-b gene (cyt-b of the mitochondrial DNA as the target of gene. Primer of cyt b gene was designed based on the tuna species. This study aimed to identify the authenticity of tuna fresh and its processed products through protein using SDS-PAGE and DNA barcoding techniques. The phases of this research were protein electrophoresis by SDS-PAGE, DNA extraction, PCR amplification, electrophoresis and sequencing. Samples of fresh fish (Tu1, Tu2, Tu3, Tu4, and Tu5 and processed tuna (canned and steak were successfully extracted. Result showed that SDS-PAGE proved the damage of proteins in the processed tuna, so this method was not appropriate if it is used to identify the authenticity of tuna. PCR electrophoresis results showed that the samples of tuna, tuna steak, sushi, meat ball, abon, and caned tuna were successfully amplified in the range of 500-750 bp except Ka3, which was in line with the target of DNA (620 bp. Resulted sequences of Tu2, Tu3, Tu4 and Tu5 were identified according the results of morphometric namely T. albacares, while Tu1 was identified as T. obesus with homology level of 99%. Processed tunas (steak and canned tuna were identified as T. albacares, as stated on the labels.

  8. Selectivity of hook type on hooking species for the tuna longline fishery in the Southern and Central Indian Ocean%印度洋中南部水域金枪鱼延绳钓钓钩钩型对钓获对象的选择性

    Institute of Scientific and Technical Information of China (English)

    朱国平; 陈锦淘; 许柳雄; 李攀

    2011-01-01

    Based on the data collected from the fishing ground of tuna longliners in the Southern-central Indian Ocean during September 2008 to April 2009, the present study compares and analyzes the catchability and selectivity to hooking species for 3 hook types(traditional tuna hook, "J"-type hook and circle hook).The results show that (1) for traditional tuna hook, the proportion of bigeye tuna( Thunnus obesus, BET)and blue shark( Prionace glauca,BLS)is higher than other species in the catch composition and "J"-type hook and circle hook have a similar hooking proportion for the above two species, however, for albacore ( Thunnus alalunga, ALB), the traditional tuna hook has the highest hooking proportion and followed by "J"-type hook and circle hook.(2) the traditional tuna hook has the highest survival rate and the "J"-type is lowest for BET, the survival rate of "J"-type hook is slightly higher than that of circle hook and the traditional tuna hook is the lowest for ALB, the survival rate of circle hook is highest and followed by traditional tuna hook and "J"-type hook for BLS.(3) the average fork length(FL) of ALB for "J"-type hook is slightly larger than that of traditional tuna hook and circle hook, traditional tuna hook is larger than circle hook and "J"-type hook for BET and "J"-type is larger than circle hook and traditional tuna hook for BLS.(4) significant difference has not been found for the FL distribution of ALB, BET and BLS for 3 hook types.%基于2008年9月至2009年4月在印度洋中南部水域金枪鱼延绳钓渔场收集的数据,研究分析和比较了3种钓钩钩型(传统金枪鱼钩、"J"形钩和圆形钩)的渔获效益及对钓捕对象的选择性.结果表明:(1)从渔获种类上看,大眼金枪鱼和大青鲨金枪鱼钩钓获比例最高,"J"形钩和圆形钩的钓获比例相当;而长鳍金枪鱼则为金枪鱼钩钓获比例最高,其次为"J"形钩和圆形钩.(2)大眼金枪鱼存活率以金枪鱼钩最高,"J"形钩最低;长鳍

  9. Spatial Patterns and Temperature Predictions of Tuna Fatty Acids: Tracing Essential Nutrients and Changes in Primary Producers.

    Science.gov (United States)

    Pethybridge, Heidi R; Parrish, Christopher C; Morrongiello, John; Young, Jock W; Farley, Jessica H; Gunasekera, Rasanthi M; Nichols, Peter D

    2015-01-01

    Fatty acids are among the least understood nutrients in marine environments, despite their profile as key energy components of food webs and that they are essential to all life forms. Presented here is a novel approach to predict the spatial-temporal distributions of fatty acids in marine resources using generalized additive mixed models. Fatty acid tracers (FAT) of key primary producers, nutritional condition indices and concentrations of two essential long-chain (≥C20) omega-3 fatty acids (EFA) measured in muscle of albacore tuna, Thunnus alalunga, sampled in the south-west Pacific Ocean were response variables. Predictive variables were: location, time, sea surface temperature (SST) and chlorophyll-a (Chla), and phytoplankton biomass at time of catch and curved fork length. The best model fit for all fatty acid parameters included fish length and SST. The first oceanographic contour maps of EFA and FAT (FATscapes) were produced and demonstrated clear geographical gradients in the study region. Predicted changes in all fatty acid parameters reflected shifts in the size-structure of dominant primary producers. Model projections show that the supply and availability of EFA are likely to be negatively affected by increases in SST especially in temperate waters where a 12% reduction in both total fatty acid content and EFA proportions are predicted. Such changes will have large implications for the availability of energy and associated health benefits to high-order consumers. Results convey new concerns on impacts of projected climate change on fish-derived EFA in marine systems.

  10. Report of Didymocystis wedli Ariola, 1902 (Digenea; Didymozoidae from Thunnus albacares in Brazil

    Directory of Open Access Journals (Sweden)

    A Kohn

    2001-10-01

    Full Text Available Didymocystis wedli a parasite from the gills of Thunnus albacares from the coast of the State of Rio de Janeiro, is described by use of light and scanning electron microscopy. This is the first report of this species in Brazil and South America. New data are presented on the surface topography as demonstrated by scanning electron microscopy.

  11. KEBIJAKAN PENGELOLAAN HASIL TANGKAPAN SAMPINGAN TUNA LONGLINE DI SAMUDERA HINDIA

    Directory of Open Access Journals (Sweden)

    Budi Nugraha

    2013-11-01

    Full Text Available Tuna longline atau rawai tuna merupakan salah satu alat tangkap yang sangat efektif untuk menangkap tuna. Selain efektif alat tangkap ini juga merupakan alat tangkap yang selektif terhadap hasil tangkapannya. Namun demikian, alat tangkap ini masih menimbulkan suatu masalah dimana ikan hasil tangkapan yang diperoleh tidak semuanya merupakan hasil tangkapan utama (target species, ada sebagian yang merupakan hasil tangkapan sampingan (by-catch. Sebagian besar hasil tangkapan sampingan tuna longline memiliki nilai ekonomis, hanya jenis pari lumpur dan ikan naga yang tidak memiliki nilai ekonomis. Namun demikian, justru yang tidak memiliki nilai ekonomis mendominasi hasil tangkapan sampingan pada perikanan tuna longline. Oleh karena itu perlu adanya tindak lanjut dengan menyusun peraturan atau regulasi yang terkait dengan pengelolaan ikan hasil tangkapan sampingan dan pengelolaan yang benar terhadap hasil tangkapan tersebut beserta habitatnya agar terjaga kelestarian sumberdayanya dan juga tetap menjadi sumber pendapatan masyarakat.Tulisan ini membahas secara ringkas tentang isu hasil tangkapan sampingan pada perikanan tuna longline, komposisi jenisnya, pemanfaatannya dan kebijakannya. Tuna longline is one of the most effective fishing gears to catch tuna. In addition, this fishing gear is selective to catch tuna. However, this gear is still causing a problem where some species other than their target species were caught as by-catch. Most of by-catch species from the tuna longliners have an economic value, except pelagic stingrays and lancetfish. In fact, these by-catch species (non economical-valued species dominated the longline catch. Therefore, it is needed to develop rules or regulations related to the management of the fish by-products, and properly manage the fishing activities on these by-catch species and habitat preservation to preserve its resources and also remain as a source of income. This paper briefly discusses the issue of by

  12. Effect of Storage Temperature on the Outgrowth and Toxin Production of Staphylococcus aureus in Freeze-Thawed Precooked Tuna Meat.

    Science.gov (United States)

    Kataoka, Ai; Enache, Elena; Napier, Carla; Hayman, Melinda; Weddig, Lisa

    2016-04-01

    The aim of this study was to determine the time for a 3-log CFU/g outgrowth of Staphylococcus aureus and its toxin production in previously frozen precooked tuna meat (albacore [Thunnus alalunga] prepared as loin, chunk, and flake or skipjack [Katsuwonus pelamis] prepared as chunk and flake) held either at 21 or 27°C. A five-strain cocktail of enterotoxin-producing S. aureus was surface inoculated with ∼10(3) CFU/g onto tuna samples. The experimental time-temperature conditions were designed to mimic common industry holding conditions. After a 3-h incubation at 37°C, inoculated samples were individually vacuum sealed and stored at 20°C for 4 weeks. Following frozen storage, samples were thawed to the target temperature (21 or 27°C) and then incubated aerobically. Growth of S. aureus in tuna was then monitored using Baird Parker agar; simultaneously, aerobic plate counts, enterotoxin production, and sensory profile (color and odor) were determined. The results showed that the time for a 3-log CFU/g increase was >20 h at 21°C and 8 to 12 h at 27°C for albacore, with toxin production observed at 14 to 16 h at 21°C and at 8 h at 27°C. A 3-log CFU/g increase for skipjack occurred at 22 to 24 h at 21°C and at 10 to 14 h at 27°C. The toxin production in skipjack started at 20 to 22 h at 21°C and at 8 to 10 h at 27°C. Toxin production was observed before a 3-log increase was achieved in albacore samples at 21°C. Under all conditions, toxins were detected when the cell density of S. aureus was 6 log CFU/g. Overall, significantly faster S. aureus growth was observed in albacore compared with skipjack (P aureus and to design manufacturing controls that ensure food safety.

  13. Modificaciones en la grasa del atún blanco (Thunnus alalunga debidas a la fabricación y almacenamiento de su conserva

    Directory of Open Access Journals (Sweden)

    Navarro, María P.

    1991-06-01

    Full Text Available Modifications in fatty acid composition in white tuna (Thunnus alalunga ocurring at each stage of the cannig process, boiling and sterilization in soybean oil, were studied. Boiling was performed in brine and two sterilization times (55 and 90 minutes as well as the effects of storage for one year were tested. Boiling had no effect on fatty acid composition or the n-3/n-6 ratio. However canned tuna absorbed soybean oil during sterilization, causing an increase of the percentage of C18:1, C18:2 and C18:3 and a decrease in C20:5 and C22:6. Therefore, unsaturated fatty acids to saturated fatty acids (PS/S ratio changed and the n-3/n-6 ratio declined from 7.03 to 0.59 compared with raw tuna. Due to the whole fat enrichment, canned fish showed a slight loss of PUFA (C20:5 and C22:6 and a increase of C18:1, C18:2 and C18:3. The latter effect was more marked in the preserves as a consequence of one year storage. The convenience of using for cannig an oil containing a lower amount of polyunsaturated fatty acid in order to remain the original n-3/n-6 ratio of the raw tuna is discussed.Se estudiaron los cambios que se producen en la grasa del atún blanco en cada una de las etapas que intervienen en el proceso de fabricación y almacenamiento de su conserva: cocción en salmuera y esterilización practicada en aceite de soja. Se estudiaron dos tiempos diferentes de esterilización (55 y 90 minutos y el almacenamiento por espacio de 1 año. La cocción en salmuera no afectó a la composición en ácidos grasos de los lípidos del pescado ni a la relación n-3/n-6. Sin embargo, durante la esterilización, el atún absorbió el aceite utilizado como cobertura, lo que produjo un aumento porcentual en el nivel de C18:1, C18:2, C18:3 y una disminución en C20:5 y C22:6. La relación ácidos grasos insaturados a saturados (PS/S cambió y la n-3/n-6 disminuyó desde 7,03 a 0,59 comparado con atún crudo. En el pescado en conserva, debido al enriquecimiento total

  14. Application of a Bayesian method to data-poor stock assessment by using Indian Ocean albacore (Thunnus alalunga) stock assessment as an example

    Institute of Scientific and Technical Information of China (English)

    GUAN Wenjiang; TANG Lin; ZHU Jiangfeng; TIAN Siquan; XU Liuxiong

    2016-01-01

    It is widely recognized that assessments of the status of data-poor fish stocks are challenging and that Bayesian analysis is one of the methods which can be used to improve the reliability of stock assessments in data-poor situations through borrowing strength from prior information deduced from species with good-quality data or other known information. Because there is considerable uncertainty remaining in the stock assessment of albacore tuna (Thunnus alalunga) in the Indian Ocean due to the limited and low-quality data, we investigate the advantages of a Bayesian method in data-poor stock assessment by using Indian Ocean albacore stock assessment as an example. Eight Bayesian biomass dynamics models with different prior assumptions and catch data series were developed to assess the stock. The results show (1) the rationality of choice of catch data series and assumption of parameters could be enhanced by analyzing the posterior distribution of the parameters; (2) the reliability of the stock assessment could be improved by using demographic methods to construct a prior for the intrinsic rate of increase (r). Because we can make use of more information to improve the rationality of parameter estimation and the reliability of the stock assessment compared with traditional statistical methods by incorporating any available knowledge into the informative priors and analyzing the posterior distribution based on Bayesian framework in data-poor situations, we suggest that the Bayesian method should be an alternative method to be applied in data-poor species stock assessment, such as Indian Ocean albacore.

  15. Mercury in canned tuna: white versus light and temporal variation.

    Science.gov (United States)

    Burger, Joanna; Gochfeld, Michael

    2004-11-01

    There are abundant data and advisories for mercury levels in wild fish, but far fewer for commercial fish that compose a large majority of the fish most people eat. Until recently, relatively little attention has been devoted to examining mercury in canned tuna, despite its great importance in human diets. There is substantial media coverage of the benefits and risk from fish consumption, but few peer-reviewed data on canned tuna, the most commonly consumed fish in the United States. In this paper, we examine the levels of total mercury in canned tuna obtained from a New Jersey grocery store from 1998 to 2003, looking for temporal consistency within this data set and particularly for comparison with the Food and Drug Administration's 1991 study. We analyzed 168 cans individually for total mercury. All values are reported as parts per million (= microg/g) on a wet weight basis. In a subset of samples analyzed for total and inorganic mercury, the inorganic mercury was below detection levels; hence at least 89% of the mercury can be considered methylmercury. We found that white-style tuna had significantly more total mercury (mean 0.407 ppm) than light-style tuna (mean 0.118 ppm), presumably reflecting that "white" tuna is albacore, a species relatively larger than the skipjack tuna, which is commonly available as "light" or "chunk light." The maximum mercury in a can was 0.997 ppm, but 25% of white tuna samples exceeded 0.5 ppm. Data suggest a slight increase in levels since 1991, and mercury levels were significantly higher in 2001 than in other years. The mean level of mercury in white tuna (mean 0.407 ppm) was significantly higher than the mean value of 0.17 ppm currently used by the U.S. Food and Drug Administration (FDA) in its risk assessment and public information. There were no significant differences in mercury levels in tuna packed in oil compared to water. Draining contents had no effect on mercury levels, and the fluid, both oil and water, contained

  16. Tuna longline fishing around West and Central Pacific seamounts.

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    Telmo Morato

    Full Text Available BACKGROUND: Seamounts have been identified as aggregating locations for pelagic biodiversity including tuna; however the topography and prevailing oceanography differ between seamounts and not all are important for tuna. Although a relatively common feature in oceanic ecosystems, little information is available that identifies those that are biologically important. Improved knowledge offers opportunities for unique management of these areas, which may advance the sustainable management of oceanic resources. In this study, we evaluate the existence of an association between seamounts and tuna longline fisheries at the ocean basin scale, identify significant seamounts for tuna in the western and central Pacific Ocean, and quantify the seamount contribution to the tuna longline catch. METHODOLOGY/PRINCIPAL FINDINGS: We use data collected for the Western and Central Pacific Ocean for bigeye, yellowfin, and albacore tuna at the ocean basin scale. GLMs were applied to a coupled dataset of longline fisheries catch and effort, and seamount location information. The analyses show that seamounts may be associated with an annual longline combined catch of 35 thousand tonnes, with higher catch apparent for yellowfin, bigeye, and albacore tuna on 17%, 14%, and 14% of seamounts respectively. In contrast 14%, 18%, and 20% of seamounts had significantly lower catches for yellowfin, bigeye and albacore tuna respectively. Studying catch data in relation to seamount positions presents several challenges such as bias in location of seamounts, or lack of spatial resolution of fisheries data. Whilst we recognize these limitations the criteria used for detecting significant seamounts were conservative and the error in identification is likely to be low albeit unknown. CONCLUSIONS/SIGNIFICANCE: Seamounts throughout the study area were found to either enhance or reduce tuna catch. This indicates that management of seamounts is important Pacific-wide, but management

  17. Massive consumption of gelatinous plankton by Mediterranean apex predators.

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    Luis Cardona

    Full Text Available Stable isotopes of carbon and nitrogen were used to test the hypothesis that stomach content analysis has systematically overlooked the consumption of gelatinous zooplankton by pelagic mesopredators and apex predators. The results strongly supported a major role of gelatinous plankton in the diet of bluefin tuna (Thunnus thynnus, little tunny (Euthynnus alletteratus, spearfish (Tetrapturus belone and swordfish (Xiphias gladius. Loggerhead sea turtles (Caretta caretta in the oceanic stage and ocean sunfish (Mola mola also primarily relied on gelatinous zooplankton. In contrast, stable isotope ratios ruled out any relevant consumption of gelatinous plankton by bluefish (Pomatomus saltatrix, blue shark (Prionace glauca, leerfish (Lichia amia, bonito (Sarda sarda, striped dolphin (Stenella caerueloalba and loggerhead sea turtles (Caretta caretta in the neritic stage, all of which primarily relied on fish and squid. Fin whales (Balaenoptera physalus were confirmed as crustacean consumers. The ratios of stable isotopes in albacore (Thunnus alalunga, amberjack (Seriola dumerili, blue butterfish (Stromaeus fiatola, bullet tuna (Auxis rochei, dolphinfish (Coryphaena hyppurus, horse mackerel (Trachurus trachurus, mackerel (Scomber scombrus and pompano (Trachinotus ovatus were consistent with mixed diets revealed by stomach content analysis, including nekton and crustaceans, but the consumption of gelatinous plankton could not be ruled out completely. In conclusion, the jellyvorous guild in the Mediterranean integrates two specialists (ocean sunfish and loggerhead sea turtles in the oceanic stage and several opportunists (bluefin tuna, little tunny, spearfish, swordfish and, perhaps, blue butterfish, most of them with shrinking populations due to overfishing.

  18. Massive consumption of gelatinous plankton by Mediterranean apex predators.

    Science.gov (United States)

    Cardona, Luis; Álvarez de Quevedo, Irene; Borrell, Assumpció; Aguilar, Alex

    2012-01-01

    Stable isotopes of carbon and nitrogen were used to test the hypothesis that stomach content analysis has systematically overlooked the consumption of gelatinous zooplankton by pelagic mesopredators and apex predators. The results strongly supported a major role of gelatinous plankton in the diet of bluefin tuna (Thunnus thynnus), little tunny (Euthynnus alletteratus), spearfish (Tetrapturus belone) and swordfish (Xiphias gladius). Loggerhead sea turtles (Caretta caretta) in the oceanic stage and ocean sunfish (Mola mola) also primarily relied on gelatinous zooplankton. In contrast, stable isotope ratios ruled out any relevant consumption of gelatinous plankton by bluefish (Pomatomus saltatrix), blue shark (Prionace glauca), leerfish (Lichia amia), bonito (Sarda sarda), striped dolphin (Stenella caerueloalba) and loggerhead sea turtles (Caretta caretta) in the neritic stage, all of which primarily relied on fish and squid. Fin whales (Balaenoptera physalus) were confirmed as crustacean consumers. The ratios of stable isotopes in albacore (Thunnus alalunga), amberjack (Seriola dumerili), blue butterfish (Stromaeus fiatola), bullet tuna (Auxis rochei), dolphinfish (Coryphaena hyppurus), horse mackerel (Trachurus trachurus), mackerel (Scomber scombrus) and pompano (Trachinotus ovatus) were consistent with mixed diets revealed by stomach content analysis, including nekton and crustaceans, but the consumption of gelatinous plankton could not be ruled out completely. In conclusion, the jellyvorous guild in the Mediterranean integrates two specialists (ocean sunfish and loggerhead sea turtles in the oceanic stage) and several opportunists (bluefin tuna, little tunny, spearfish, swordfish and, perhaps, blue butterfish), most of them with shrinking populations due to overfishing.

  19. Seasonal variability of temperature profile in Thunnus obesus and Thunnus albacares fishing ground in the Indian Ocean%印度洋大眼金枪鱼和黄鳍金枪鱼渔场水温垂直结构的季节变化

    Institute of Scientific and Technical Information of China (English)

    杨胜龙; 马军杰; 伍玉梅; 唐峰华; 张衡; 周甦芳

    2012-01-01

    temperature of the thermocline topography is large in the south of 10°S and weak below the warm-pool region. The variability of temperature difference from 10 to 200 m, on the annual model is similar to the upper boundary temperature of the thermocline. The spatial distribution of vertical temperature difference is divided by 10°S longitude line. The temperature difference is lower than 10℃ in the south and it is greater than 10℃ in the north. The Analysis results reveal the spatial distribution seasonal characteristic of the upper boundary depth, temperature of the thermocline and vertical temperature difference in major tuna fishing ground of T. obesus and T. albacares in the Indian Ocean, which provide reference to long line production operation in sea of tuna.%为了解印度洋大眼金枪鱼(Thunnus obesus)和黄鳍金枪鱼(Thunnus albacares)主要作业渔场温跃层上界温度、深度和垂直温差时空变化特征,采用2007~2010年Argo温度剖面浮标资料,计算了印度洋大眼金枪鱼、黄鳍金枪鱼主要作业渔场次表层温度和温跃层特征参数.研究认为,温跃层上界深度、温度和10~200 m温差存在明显的季节性变化.5~9月在15°~25°S纬向区域存在一块季节性较深的温跃层上界深度区域;在20°S以南海域,12月至次年4月份温跃层上界深度非常浅;在15°S至赤道纬向区域,尤其是在西部,常年存在一块温跃层较浅的区域.总体而言,温跃层上界深度较深的地方温度相对较低,在2~5月期间,在阿拉伯海东南和孟加拉湾西南形成一块大面积的暖水区;7~9月期间,在15°~25°S,纬向区域因温跃层上界深度较深,从表层至温跃层上界深度温度变化相对较大,温跃层上界温度显著较低.在20°S以南,温跃层上界温度常年都很低.10°S经线方向将水下10 ~200 m垂直温度分成南北两部分,10°S以南部及以北部海区的垂直温差分别大于和小于10℃.分析结果初步揭示

  20. Models of Forecasting Fishing Ground of Thunnus Alalunga in the South Pacific Ocean%南太平洋长鳍金枪鱼渔场预报模型研究

    Institute of Scientific and Technical Information of China (English)

    范江涛; 陈新军; 钱卫国; 刘必林

    2011-01-01

    The ablacore {Thunnus alalunga) is one of the main targets in tuna longline fishery in the south Pacific Ocean, and also one of the main fishing targets for Chinese tuna longline fishery. The production data collected from Chinese fishing companies during 2008 to 2009 in the south Pacific ocean, was applied in combination with the environmental data such as the sea surface temperature, water temperature at 105 meter layer, water temperature at 205 meter layer, sea surface height, and chlorophyll a concentration, the habitat suitability curve of each environmental factor for one quarter was established by using a linear regression, and the habitat suitability index model was set up by using arithmetic mean model (AMM) and was applied to forecast the fishing ground. According to the validation with the actual fishing data, the results indicated that the prediction accuracy of this model is above 70%. This forecasting model will play a guide role for fishing in the tuna longline fishery.%长鳍金枪鱼资源是南太平洋金枪鱼渔业的重要目标种类,也是我国金枪鱼延绳钓的主要捕捞对象之一.根据2008-2009年我国海洋渔业公司在南太平洋海域的生产数据,结合表层、105m和205m水层温度,以及海面高度、叶绿素a浓度等海洋环境数据,运用一元非线性回归方法,按季度建立基于各环境因子的长鳍金枪鱼栖息地适应性指数,采用算术平均法获得基于多环境因子的栖息地指数综合模型,并用于中心渔场的预报.通过与实际作业渔场的比较与验证,结果表明:模型预报准确性达到70%以上,具较高渔情预报准确度.

  1. 非超低温冻藏金枪鱼理化变化及相关性%Changes in Physicochemical Properties of Meat from Two Different Tuna Varieties during Frozen Storage at Non-Ultralow Temperatures and Correlation Analysis

    Institute of Scientific and Technical Information of China (English)

    贡慧; 杨震; 李梦瑶; 刘梦; 李少鹏; 王守伟

    2016-01-01

    At present, limited research is reported on changes in the sensory quality and physicochemical properties of raw and processed tuna products frozen at non-ultralow temperatures. Most previous research focused on bigeye and yellowfin tuna; however, other tuna varieties have been scarcely researched. In this work, changes inK value and metmyoglobin content of meat from southern bluefin tuna and swordfish during frozen storage at non-ultralow temperatures (−18 and−30℃) were detected, and correlation analysis of theK value and sensory quality was carried out. The results showed that during frozen storage at−18℃,K value and metmyoglobin content increased faster and the sensory quality deteriorated more rapidly. Although the flavor and odor did not change obviously, the texture and taste deteriorated significantly. Based on sensory evaluation, the storage period at−18℃ of tuna to be raw eaten was 14 days, while that at −30℃ was more than 70 days.K values after storage at both temperatures were less than 10%. As a result, the use ofK value to evaluate fish freshness under certain conditions needs to be reconsidered.%研究马苏和剑鳍金枪鱼生食产品在-18℃与-30℃非超低温条件下的K值和高铁肌红蛋白相对含量的变化规律,并进行K值与感官品质的相关性分析。结果表明:-18℃条件下金枪鱼生食产品冻藏期内K值和高铁肌红蛋白相对含量上升和感官品质劣化更快;冻藏期间产品滋味、气味变化不明显,但组织结构和口感劣化明显;以感官评价为依据,在-18℃条件下生食终点约为14 d,而-30℃条件下可达70 d以上,此时K值均小于10%,因此以K值作为产品新鲜度评价在特定条件下需要重新审视。

  2. HYDRODYNAMIC ANALYSIS AND SIMULATION OF A SWIMMING BIONIC ROBOT TUNA

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A dynamic model for undulatory locomotion was proposed to study the swimming mechanism of a developed bionic robot tuna. On the basis of inviscid hydrodynamics and rigid-body dynamics, the momentum and propulsive force required for propelling the swimming robot tuna's flexible body was calculated. By solving the established dynamic equations and efficiency formula, the swimming velocity and propulsive efficiency of the bionic robot tuna were obtained. The relationship between the kinematic parameters of the robot tuna's body curve and the hydrodynamic performances was established and discussed after hydrodynamic simulations. The results presented in this article can be used to increase the swimming speed, propulsive thrust, and the efficiency of underwater vehicles effectively.

  3. Die Transurethrale Nadel-Ablation der Prostata (TUNA

    Directory of Open Access Journals (Sweden)

    Stark L

    1998-01-01

    Full Text Available 25 Patienten im Alter von 56?92 Jahren (Durchschnitt: 74,9 mit symptomatischer BPH wurden mittels TUNA therapiert. Das Prostatavolumen betrug 19-160 ml (durchschnittlich 56,6. 14 Patienten (56 % wurden aufgrund eines akuten Harnverhaltes therapiert, 9 Patienten (36 % hatten Restharn zwischen 30 und 700 ml, 2 Patienten (8 % wurden wegen irritativer Symptome behandelt. Bei 4 Patienten wurde die TUNA 2-3 mal wiederholt, bei 5 Patienten kombinierten wir die TUNA mit einer transurethralen Resektion einer Mittellappenhyperplasie. Von den 25 Patienten waren 17 Hochrisikopatienten (ASA III-IV. Die Erfolgsquote betrug 68 %. 6 Patienten (24 % benötigten weiterhin eine transurethrale oder suprapubische Harnableitung, 2 Patienten benötigten eine weitere invasive Therapie. Unsere Ergebnisse bestätigen die TUNA als wirkungsvolle und äußerst nebenwirkungsarme Therapiemöglichkeit bei Patienten mit symptomatischer BPH.

  4. Modelling the impact of climate change on South Pacific albacore tuna

    Science.gov (United States)

    Lehodey, Patrick; Senina, Inna; Nicol, Simon; Hampton, John

    2015-03-01

    The potential impact of climate change under the IPCC AR4-A2 scenario (close to the AR5-RCP8.5 scenario) on south Pacific albacore tuna (Thunnus alalunga) is simulated with the Spatial Ecosystem And Population Dynamics Model (SEAPODYM) and environmental forcing variables provided by the Earth Climate model IPSL-CM4. Parameters controlling the habitat and dynamics of the population were optimized by fitting the model, using maximum likelihood, to a complete fishing data set for the historical fishing period since 1950. Albacore undertake clear seasonal migrations between feeding and spawning grounds, as evidenced by seasonal catch and size composition changes. This seasonality was well predicted by the SEAPODYM albacore simulations. The total biomass estimate of south Pacific albacore was predicted to have decreased from ~1.8 million tonnes (Mt) at the beginning of industrial fisheries in 1950 to 1.25 Mt in 2006, in good agreement with an independent estimate from stock assessment analysis. A simulation without fishing indicated an equivalent contribution of environmental variability and fishing to the historical decrease of the stock biomass. The parameterized SEAPODYM model was used to project the dynamics of the population until the end of the 21st century with an average fishing effort based on recent years. Under this fishing and climate change scenario, the population was predicted to decrease and to stabilize after 2035 just below 0.8 Mt, i.e., 55% below the initial biomass of 1960. After 2080 however, the trend was reversed when a new spawning ground emerged in the north Tasman Sea. A test simulation highlighted the sensitivity of the model results to projected dissolved oxygen concentration for which there is large uncertainty in the tropical region. A second test simulation showed that genetic selection favouring albacore with preferences for higher optimal ambient spawning temperature would maintain a reduced level of spawning in current tropical spawning

  5. Spatial Patterns and Temperature Predictions of Tuna Fatty Acids: Tracing Essential Nutrients and Changes in Primary Producers.

    Directory of Open Access Journals (Sweden)

    Heidi R Pethybridge

    Full Text Available Fatty acids are among the least understood nutrients in marine environments, despite their profile as key energy components of food webs and that they are essential to all life forms. Presented here is a novel approach to predict the spatial-temporal distributions of fatty acids in marine resources using generalized additive mixed models. Fatty acid tracers (FAT of key primary producers, nutritional condition indices and concentrations of two essential long-chain (≥C20 omega-3 fatty acids (EFA measured in muscle of albacore tuna, Thunnus alalunga, sampled in the south-west Pacific Ocean were response variables. Predictive variables were: location, time, sea surface temperature (SST and chlorophyll-a (Chla, and phytoplankton biomass at time of catch and curved fork length. The best model fit for all fatty acid parameters included fish length and SST. The first oceanographic contour maps of EFA and FAT (FATscapes were produced and demonstrated clear geographical gradients in the study region. Predicted changes in all fatty acid parameters reflected shifts in the size-structure of dominant primary producers. Model projections show that the supply and availability of EFA are likely to be negatively affected by increases in SST especially in temperate waters where a 12% reduction in both total fatty acid content and EFA proportions are predicted. Such changes will have large implications for the availability of energy and associated health benefits to high-order consumers. Results convey new concerns on impacts of projected climate change on fish-derived EFA in marine systems.

  6. KEDALAMAN RENANG DAN WAKTU MAKAN IKAN ALBAKORA (Thunnus alalunga DI SAMUDERA HINDIA SEBELAH SELATAN JAWA

    Directory of Open Access Journals (Sweden)

    Andi Bahtiar

    2015-12-01

    results showed that the swimming layer of albacore based minilogger data are distributed at 57.04 to 325.46 m The results showed that the swimming layer of albacore at 57.04 to 325.46 m. Albacore mostly catched in surface layer to middle in Indian Ocean. The feeding periodicity of albacore’s are start from 7:45pm to 17:59pm, mostly active at 10pmto 11pm. For the maximum catch of albacore’s, every fisherman of tuna longline must have a good fishing tactics. The combination of surface and middle tuna longline types are the best fishing tactics to be applied. The setting of tuna longline begin morning and hauling begin afternoon are the best time for fishing of albacore in the Indian Ocean.

  7. The effects of water depth and light on oviposition and egg cannibalism in the bluefin killifish Lucania goodei.

    Science.gov (United States)

    Sandkam, B A; Fuller, R C

    2011-03-01

    This study showed that sex and depth had strong effects on egg cannibalism, whereas water clarity (clear v. tea-stained) had no effect on cannibalism or oviposition in the bluefin killifish Lucania goodei. These results are consistent with the extreme levels of iteroparity in L. goodei where females appear to spread their eggs across multiple locations and depths presumably to avoid egg predation.

  8. 不同真空蒸汽解冻条件对金枪鱼感官的影响%Effects of Vacuum-steam Thawing on the Sense of Tuna

    Institute of Scientific and Technical Information of China (English)

    李念文; 谢晶; 周然; 汤元睿; 周研; 徐慧文

    2014-01-01

    Effects of vacuum-steam thawing on the sensory changes of tuna ( Thunnus obesus) were studied in this paper. We thawed tu-na by different vacuum degree of 70 kPa, 50 kPa, 30 kPa and 10 kPa, respectively. The best condition of vacuum-steam thawing would be established by measuring physical and chemical indices of tuna in 48 h after thawing. The results suggested that vacuum-steam thawing can suppress the oxidation of myoglobin and fatty acid, reduce the degree of browning and acidation. During the storage period of 48 h, a tuna chunk vacuum-steam thawed under 10 kPa had better quality than other experimental groups: a* value was 13. 25, metmyoglobin percentage was 23. 66%, reducing capacity was 39. 66 FeSO4 μmol/g, sensory evaluation was rejected until tuna stored for 36 h. At the same time, tuna thawed by 10 kPa vacuum-steam showed the minimum difference among all the experimental groups compared with the fresh thawed tuna by electronic tongue. All the results showed that the higher the vacuum degree of thawing is, the better the sense the tu-na chunk will be.%研究真空蒸汽解冻条件对大目金枪鱼块感官的影响,选择70 kPa、50 kPa、30 kPa、10 kPa四种不同的真空度对大目金枪鱼进行解冻,通过测定金枪鱼块解冻后48 h内的理化指标,确定金枪鱼块真空蒸汽解冻的最佳条件。实验结果表明真空蒸汽解冻能抑制金枪鱼中高铁肌红蛋白和脂肪的氧化,降低鱼肉褐变、酸败的程度;10 kPa真空蒸汽解冻组的金枪鱼肉0℃贮藏48 h后a*值为13�25,高铁肌红蛋白百分比23�66%,还原力为39�66 FeSO4μmol/g,感官评定36 h后才不能接受,显著高于其他各组,并且根据电子舌主成分分析,该组与新鲜解冻的鱼肉差异性最小,可见解冻时真空度越大,鱼肉的色泽,口味等感官指标越好。

  9. Magnitude and ecological implications of thermal inertia in skipjack tuna, Katsuwonus pelamis (Linnaeus)

    Energy Technology Data Exchange (ETDEWEB)

    Neill, W.H.; Chang, R.K.C.; Dizon, A.E.

    1976-01-01

    The paper discusses results of experiments or the heat exchange processes used in skipjack tuna thormoregulation and the role of large thermal inertia in tuna ecology. The results indicated that skipjack tuna exchanged core heat with the environment only about 60% as rapidly as did typical telcosts and even somewhat more slowly than did air-breathing aquatic reptiles. (JWP)

  10. 76 FR 3646 - Safety Requirements and Manning Exemption Eligibility on Distant Water Tuna Fleet Vessels

    Science.gov (United States)

    2011-01-20

    ... SECURITY Coast Guard Safety Requirements and Manning Exemption Eligibility on Distant Water Tuna Fleet... Requirements and Manning Exemption Eligibility on Distant Water Tuna Fleet Vessels. All comments received will... availability of a draft policy regarding distant water tuna fleet vessels manning exemption eligibility...

  11. 50 CFR 216.95 - Official mark for “Dolphin-safe” tuna products.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Official mark for âDolphin-safeâ tuna... AND IMPORTING OF MARINE MAMMALS Dolphin Safe Tuna Labeling § 216.95 Official mark for “Dolphin-safe... Department of Commerce that may be used to label tuna products that meet the “dolphin-safe” standards...

  12. The relationship between ENSO and spatio-temporal distribution of CPUE of yellowfin tuna(Thunnus albacares) by purse seine in the Eastern Pacific Ocean%ENSO现象与东太平洋黄鳍金枪鱼围网CPUE时空分布的关系

    Institute of Scientific and Technical Information of China (English)

    代丹娜; 刘洪生; 戴小杰; 田思泉

    2011-01-01

    Yellowfin tuna(Thunnus albacares) is a major target species of the tuna purse seine fishery in the Eastern Pacific Ocean.Based on yellowfin tuna purse-seine fisheries data in the Eastern Pacific Ocean(30°N-25°S,75°W-145°W)from 1975 to 2004 and the corresponding Nino3 index(sea surface temperature anomaly),the relationship between ENSO and yellowfin tuna stock abundance and its spatio-temporal distribution are analyzed by using grey relationship analysis method in this study.Preliminary results indicate that ENSO episodes affect the stock abundance and spatio-temporal distribution of yellowfin tuna significantly.During El Nino periods,the fishing gravity center moves to the east and the north,whereas to the west during La Nina periods.There is a negative relationship between Nino3 index and CPUE.Furthermore,there is a siginifcantly regular annual change for the location of fishing gravity center.In the spring and summer,the fishing gravity center turns to the west and to the north,but it moves to the east and the south in the autumn and winter.The CPUE of the spring and summer is higher than that of the autumn and winter.%黄鳍金枪鱼是东太平洋金枪鱼围网渔业中的主要渔获种类之一。根据1975-2004年东太平洋(30°N~25°S,75°W~145°W)黄鳍金枪鱼围网生产统计资料和相应年份的Nino3区的指数,利用灰色关联度方法对ENSO现象与黄鳍金枪鱼资源丰度及时空变化的关系进行了分析。研究结果发现,ENSO现象对东太平洋黄鳍金枪鱼围网资源丰度及时空分布有显著影响,在大部分厄尔尼诺年时,黄鳍金枪鱼围网作业重心会向东、向北移;而拉尼娜年则向西移。Nino3指数与单位捕捞努力量渔获量(CPUE)存在负相关关系。此外,黄鳍金枪鱼

  13. Dynamic optimal foraging theory explains vertical migrations of bigeye tuna

    DEFF Research Database (Denmark)

    Thygesen, Uffe Høgsbro; Sommer, Lene; Evans, Karen;

    2016-01-01

    Bigeye tuna are known for remarkable daytime vertical migrations between deep water, where food is abundant but the water is cold, and the surface, where water is warm but food is relatively scarce. Here we investigate if these dive patterns can be explained by dynamic optimal foraging theory......, where the tuna maximizes its energy harvest rate. We assume that foraging efficiency increases with body temperature, so that the vertical migrations are thermoregulatory. The tuna's state is characterized by its mean body temperature and depth, and we solve the optimization problem numerically using...... behaves such as to maximize its energy gains. The model therefore provides insight into the processes underlying observed behavioral patterns and allows generating predictions of foraging behavior in unobserved environments...

  14. DISCARDS OF THE INDONESIAN TUNA LONGLINE FISHERY IN INDIAN OCEAN

    Directory of Open Access Journals (Sweden)

    Bram Setyadji

    2013-06-01

    Full Text Available Incidental by-catch and associated discarding are difficult to estimate on the basis of logbook information because they are poorly reported by fishing masters and their importance varies with several interrelated factors. The purpose of this paper is to inform the commonly discarded fishes of the Indonesian tuna longline fishery in the Indian Ocean. The study was carried out during 2010 – 2011 following six commercial tuna longline vessels based in Port of Benoa. Discards composition was dominated by longnose lancetfish and pelagic stingrays which composed almost half of total discards. Almost half of total catch are discards and half of discards are disposed dead or dying.

  15. DISKRIMINASI KELAMIN PADA IKAN TUNA SIRIP KUNING, Yellowfin tuna MENGGUNAKAN ANALISIS DOT BLOT DAN ELISA

    Directory of Open Access Journals (Sweden)

    Gusti Ngurah Permana

    2014-08-01

    Full Text Available Pemahaman tentang penentuan jenis kelamin dalam populasi induk merupakan hal yang sangat penting bagi keberhasilan program pembenihan. Pengukuran reaksi antibodi dan aktivitas hormon testosterone, serta estradiol adalah metode dengan potensi yang secara akurat dapat menentukan jenis kelamin ikan tanpa mematikan ikan. Tujuan penelitian ini adalah untuk mengetahui akurasi metode dot blot dan ELISA dengan 11-ketotestorsterone (11-KT yang tersedia secara komersial EIA-kit untuk membedakan jenis kelamin ikan tuna sirip kuning. Hasil analisis menunjukkan bahwa metode dot blot menghasilkan ekspresi vitelogenin tampak jelas pada individu betina dan efek plasma terlihat transparan, jika dibandingkan dengan individu jantan. Interpretasi dari metode ini memerlukan pengalaman dan keahlian dalam akurasi pembacaan hasil. Aktivitas hormon 11-KT dengan sampel klip sirip dan plasma memberikan hasil yang baik dengan aktivitas hormon terlihat jelas.

  16. Temporal and spatial variation characteristics of the thermocline in Thunnus obesus and Thunnus albacares fishing grounds in the tropical Atlantic Ocean%热带大西洋大眼金枪鱼和黄鳍金枪鱼渔场温跃层的时空变化特征

    Institute of Scientific and Technical Information of China (English)

    杨胜龙; 张胜茂; 蒋兴伟; 邹斌; 化成君; 周为峰

    2013-01-01

    tuna fishing ground of T.obesus and T.albacares in the tropical Atlantic Ocean which provide reference to longline production operation of tuna,and suggest that cast hook depth for T.albacares and T.obesus in the night should be around the upper boundary of the thermocline depth,and the cast hook depth for longline T.albacares in the day near the lower boundary depth of the thermocline,while the T.obesus cast hooks should be set deeper than that of T.albacares.%采用2007 ~2011年Argo浮标剖面温度资料研究了大西洋黄鳍金枪鱼(Thunnus albacares)和大眼金枪鱼(Thunnus obesus)延绳钓主要作业渔场温跃层的时空变化特征.研究结果表明热带大西洋黄鳍金枪鱼、大眼金枪鱼延绳钓主要作业渔场温跃层的上界深度和温度存在着明显的季节性变化.温跃层上界深度呈现出冬深夏浅的季节性变化特征,大致呈纬向带状分布,12月至翌年4月份,15°N以北海域温跃层上界深度超过80 rn,同期10°S以南海域的多低于50 m;6~10月份的则相反.在赤道纬向区域温跃层上界温度在27℃以上,往南北两侧30°区域温度值依次递减至20℃及以下.温跃层下界深度和温度没有明显的季节性变化.温跃层下界深度高值区域的空间分布呈现“W”形状,深度值在220 m以上.在25°S以南,从南美洲到非洲西沿岸海域并延伸到安哥拉外海,以及10°N非洲西海岸外海,在1a中的大部分月份里,温跃层下界深度浅于150 m.在15°N以北和15°S以南区域下界温度大于15℃,在这之间的纬向区域下界温度低于14℃.全年在大西洋西部的5 °~ 15°N和5 °~15°S区域的温跃层厚度最大,在80~150 m之间,冬季和夏季呈现相反的分布特征;温跃层强度高值在5°S~ 15°N纬向区域,尤其是大西洋东部,介于0.15 ~ 0.25℃/m之间.根据文中揭示的大西洋金枪鱼延绳钓主要作业渔场区温跃层的时空变化特征,作者建议晚上大眼金枪鱼

  17. Radiation hydrolysate of tuna cooking juice with enhanced antioxidant properties

    Science.gov (United States)

    Choi, Jong-il; Sung, Nak-Yun; Lee, Ju-Woon

    2012-08-01

    Tuna protein hydrolysates are of increasing interest because of their potential application as a source of bioactive peptides. Large amounts of tuna cooking juice with proteins and extracts are produced during the process of tuna canning, and these cooking juice wastes cause environmental problems. Therefore, in this study, cooking juice proteins were hydrolyzed by irradiation for their utilization as functional additives. The degree of hydrolysis of tuna cooking juice protein increased from 0% to 15.1% at the absorbed doses of 50 kGy. To investigate the antioxidant activity of the hydrolysate, it was performed the ferric reducing antioxidant power (FRAP) assay, and the lipid peroxidation inhibitory and superoxide radical scavenging activities were measured. The FRAP values increased from 1470 μM to 1930 μM and IC50 on superoxide anion was decreased from 3.91 μg/mL to 1.29 μg/mL at 50 kGy. All of the antioxidant activities were increased in the hydrolysate, suggesting that radiation hydrolysis, which is a simple process that does not require an additive catalysts or an inactivation step, is a promising method for food and environmental industries.

  18. Private provision of public information in tuna fisheries

    NARCIS (Netherlands)

    Bush, Simon R.; Bailey, Megan; Zwieten, van Paul; Kochen, Momo; Wiryawan, Budy; Doddema, Mandy; Mangunsong, Stephani C.

    2017-01-01

    Private enumeration of landings data and traceability is an emerging phenomena in developing world tuna fisheries. The general goal of these systems is to facilitate compliance with mandatory market requirements such as the European Union’s Illegal, Unreported and Unregulated fisheries regulation, a

  19. 中西太平洋金枪鱼延绳钓主要渔获物垂直结构的初步研究%Vertical distribution of main species captured by tuna longline fishery in the Western and Central Pacific

    Institute of Scientific and Technical Information of China (English)

    栾松鹤; 戴小杰; 田思泉; 张艳波

    2015-01-01

    根据2012年7~11月金枪鱼科学观察员在中西太平洋采集的钩位深度以及渔获物的钓获钩位数据,分析了各钩位的上浮率和钓获鱼种的垂直分布结构,并比较了不同鱼种垂直分布的差异性。结果表明:(1)钓钩绝对上浮率变化范围为0.49~44.73 m,相对上浮率的变化范围为0.65%~16.69%,平均绝对上浮率为23.29 m,平均相对上浮率为8.87%。(2)12种主要渔获钓获深度范围差异很大,大'(Lampris guttatus)的平均钓获深度最浅,为75.92 m,蓝枪鱼(Makaira nigricans)的平均钓获深度最深,为228.19 m。聚类分析显示12种主要渔获物可以分成3种垂直分布结构。(3)11种主要兼捕渔获钓获深度均与长鳍金枪鱼(Thunnus alalunga)钓获深度呈显著性差异。%Albacore(Thunnus alalunga),one of the main target species of commercial tuna fishery,has great economic value and a long history of scientific research.However,studies on vertical distribution of pelagic species are rare in China,and this is the first time to study the vertical distribution of pelagic species in the Western and Central Pacific at home and abroad.Information of vertical distribution of pelagic species is important for the development of effective measures to mitigate bycatch, and very helpful for better understanding of the oceanic ecosystem structure and implementation of ecosystem-based fisheries management.Learning this relationship will have a significant impact on both commercial fishing and sustainable development of resource.Data were collected by scientific observer in the Western and Central Pacific from July to December 2012.The operating range was from 06°50′S to 18°00′S,and from 160°48′W to 173°08′W,near the sea of Solomon Islands.There were 98 sets altogether in this area.The catch data contained catch species,fork length,set locations and fishing gear information like length of float

  20. Effect of Frozen Storage Temperature on the Quality of Tuna Used for Raw Consumption%冻贮温度对生食金枪鱼品质变化的影响

    Institute of Scientific and Technical Information of China (English)

    杨震; 贡慧; 史智佳; 刘梦; 李少鹏; 桂春生

    2016-01-01

    This experiment aimed to study the quality changes of tuna at low temperatures. Changes in metmyoglobin content, thiobarbituric acid-reactive substances (TBARs) value, the freshness indicatorK value and pH ofo-toro from Thunnus atlanticus,Thunnus obesus andTetrapturus audax during storage at −18 and −30℃ were examined. The results showed that with the extension of storage time, the o-toro of all three tuna species exhibited an increase in pH,K value, TBARs value and metmyoglobin content, and all these parameters changed signiifcantly faster at −18℃ than at −30℃. Compared with TBARs value and K value, metmyoglobin content was a better indicator of the eating quality of raw tuna, reaching a level higher than 30% after storage for 14 days at −18℃. In addition, the color of tuna changed from red to reddish brown, suggesting signiifcant deterioration of its sensory quality. But the storage period at −30℃ was up to 28 days.%研究普通冻贮条件下金枪鱼品质变化规律。以大目、黑鳍和红鳍3种金枪鱼前腹肉为研究对象,以高铁肌红蛋白含量、硫代巴比妥酸反应活性物质(thiobarbituric acid reaction substances,TBARs)值、鲜度指标K值、pH值为检测指标,研究其在-18、-30℃条件下金枪鱼品质随时间的变化规律。结果表明:随着贮藏时间的延长,3种金枪鱼的pH值、鲜度指标K值、TBARs值及高铁肌红蛋白含量等指标均呈现上升趋势,且-18℃条件下贮藏的金枪鱼各项指标的变化速率明显高于-30℃条件下贮藏的金枪鱼;相较于TBARs和K值,高铁肌红蛋白含量更能反映金枪鱼生食产品的食用品质;-18℃冻贮金枪鱼14 d时高铁肌红蛋白含量已超过30%,金枪鱼颜色由红色向红褐色转变,感官品质明显劣化,而-30℃冻贮条件下则可达28 d。

  1. 基于海表温度和海面高度的东太平洋大眼金枪鱼渔场预测%Forecasting ofBigeye tuna fishing ground in the Eastern Pa-cific Ocean based on sea surface temperature and sea surface height

    Institute of Scientific and Technical Information of China (English)

    沈智宾; 陈新军; 汪金涛

    2015-01-01

    The technology research of fishing ground prediction for bigeye tuna in the eastern Pacific and the estab-lishment based on fishing ground prediction model of multiple environmental factors are of great importance for the efficient development and utilization of its resources. Bigeye tuna,Thunnus obesus, is one of the important tunas in the Eastern Pacific Ocean, and also one of the main fishing targets for Chinese tuna longline fishery. In this paper, based on the catch data from longline fishery in the areas (20°N~30°S and 85°~155°W) of Eastern Pacific Ocean during 2009~2011 and the environmental data from remote sensing including sea surface temperature (SST) and sea surface height (SSH), the catch is considered as the suitability index, and the suitability curves based on SST and SSH for one quarter were established by using a non-linear regression. The habitat suitability index model was set up by using arithmetic mean model (AMM), and was validated by using the actual catch data in 2012. The results showed that the fishing ground of bigeye tuna is located in the waters with 24~29℃ SST and 0.4~0.8 m SSH. The SI curve of each factor by using nonlinear regression is significant (P<0.05). Forecast accuracy of fisheries center is 63%, which is a high forecast accuracy. This forecasting model will play a guide role for fishing fleets in the tuna longline fishery.%开展东太平洋大眼金枪鱼(Thunnus obesus)渔场预报技术研究,建立基于多环境因子渔场预报模型,将对该资源的高效开发和利用具有重要的意义。作者根据2009~2011年东太平洋海域(20°N~35°S、85°W~155°W)延绳钓生产统计数据,结合海洋遥感获得的表温(SST)和海面高度(SSH)的数据,运用一元非线性回归方法,以渔获量为适应性指数,按季度分别建立了基于SST和SSH的大眼金枪鱼栖息地适应性指数,采用算术平均法获得基于 SST 和 SSH 环境因子的栖息

  2. 金枪鱼类耳石微化学研究进展%Otolith microchemistry of tuna species: Research progress.

    Institute of Scientific and Technical Information of China (English)

    朱国平

    2011-01-01

    Microchemistry analysis of trace elements and isotopes in fishes' calcified substances is an emerging approach to analyze the population structure, life history, and migration environmental history of fishes. With the increasing improvement of the researches and applications of otolith microchemistry , this approach has been a good tool for studying the ecology of tuna species. Currently , the research contents of tuna species' otolith microchemistry mainly include trace elements and isotopes, and the former is the emphasis and hotspot in applied research, playing a vital role in the researches of population partitioning, natal origin, migration environmental history, and life history of tuna species, especially bluefin tuna. However, most of the researches are focusing on the variation of otolith' s Sr/Ca ratio, and there is no final conclusion on the relationships between the frac-tionation of isotopes C and 0 in otolith and the temperature. For the sake of exploiting the huge value of otolith microchemistry, it would be necessary to strengthen the researches on the deposition mechanisms of trace elements in otolith, and to analyze the spatio-temporal variations of various trace elements in otolith by comprehensive research methods.%近年来,基于鱼类钙化物质中微量元素和同位素等微化学成分分析已成为分析鱼类种群结构、生活史及洄游环境史等的一种新兴手段.随着鱼类耳石微化学研究及应用的日渐成熟与完善,该手段也日益成为金枪鱼类生态学研究的良好工具.目前金枪鱼类耳石微化学的研究内容主要包括微量元素和同位素等,其中微量元素是应用研究的重点和热点,其在金枪鱼类,尤其是蓝鳍金枪鱼种群划分、出生源、洄游环境史和生活史分析等方面发挥了重要的作用.但多数研究集中在耳石锶钙比率(Sr/Ca)的变化上,且关于耳石碳氧同位素分馏与温度之间的关系尚无定论.为了开

  3. Conservation and Management of Tuna Fisheries in the Indian Ocean and Indian EEZ

    Directory of Open Access Journals (Sweden)

    P. Satheeshkumar

    2013-05-01

    Full Text Available The focus of the study is to explore the recent trend and stock status of Indian Ocean and Indian EEZ, and its conservation and sustainable management of tuna fishereis. In the Indian Ocean, tuna catches increased rapidly from about 179 959 t in 1980 to about 832 246 t in 1995. They have continued to increase up to 2005; the catch was 1 318 648 t, forming about 26% of the world catch. However, since 2006 onwards there was a decline in tuna catch and in 2010 the catch was only 1 257 908 t. Tuna production in India which was continued to increase with fluctuations from 63 633 t during 2001-2005, average 78 400 t during 2006-2010, and in 2010 the catch was only 65 863 t. Tuna is an important but not a well managed fishery in the Indian Ocean and Indian EEZ. The Indian Ocean stock is currently overfished and has no proper management regulations aimed at with sustaining the stock. In the present study, sustainable management system is evaluated with information on tuna landings, stock status and major issues on tuna fishery. To address these major issues, appropriate tuna fishing policies are proposed to help sustainable development and management of tuna fishery resource in the Indian Ocean.

  4. PERBAIKAN KINERJA PENANGANAN KARGO IKAN TUNA; Di TERMINAL KARGO BANDAR UDARA INTERNASIONAL SOEKARNO HATTA

    Directory of Open Access Journals (Sweden)

    Dony Rahmad Pranoto

    2016-03-01

    Full Text Available The objectives of this study were 1 to identify the tuna cargo handling conducted in the export warehouse of PT. XYZ, 2 to determine the main variables that affect the performance of tuna cargo handling in the export warehouse of PT. XYZ, and 3 to determine what policies can be used to improve the performance of tuna cargo handling in the export warehouse of PT. XYZ. This research was conducted by using the descriptive methodology i.e. a discrete simulation model of the process of tuna cargo handling in the export warehouse of PT. XYZ by utilizing ARENA software. In the policy making of tuna cargo handling improvements, the Analytical Network Process, Benefit, Opportunity, Cost, and Risk (ANP BOCR were also used. The simulation results point out that the existing conditions contribute to the delay level of tuna cargo delivery by 12% with the quality level of 22,934%. Delays in tuna cargo delivery have led to an increase in operational costs by 1,5%. ANP BOCR results highlight that opening a special lane for perishable cargo handling will improve the performance of tuna cargo handling in the export warehouse of PT. XYZ. Furthermore, the results of discrete model simulations on the improvement scenario of tuna cargo handling performance show that by opening a special lane for perishable cargo handling, it can ensure delivery schedule to be accurate indicated by the level of on time delivery reaching up to 100%, with an average quality rate of 86.013%. By speeding up the processing period (with an average of 81.519 minutes, the delay of cargo delivery up to 100% will be reduced; therefore, the quality of tuna is maintained in a good condition with the histamine level of 6,7 ppm.Keywords: ANP BOCR, tuna, ARENA simulation system model, air cargo performance, perishable cargo

  5. Assessment of South Pacific Albacore Stock (Thunnus alalunga ) by Improved Schaefer Model

    Institute of Scientific and Technical Information of China (English)

    Wang Chien-Hsiung; Wang Shyh-Bin

    2006-01-01

    Based on catch and effort data of tuna longline fishery operating in the South Pacific Ocean, the South Pacific albacore stock was assessed by an improved Schaefer model. The results revealed that the intrinsic growth rate was about1.283 74 and carrying capacities vareied in the range from 73 734 to 266 732 metric tons. The growth ability of this species is remarkable. Stock dynamics mainly depends on environmental conditions. The stock is still in good condition. However, the continuous decreasing of biomass in recent years should be noticed.

  6. PRODUKTIVITAS DAN MUSIM PENANGKAPAN IKAN MADIDIHANG (Thunnus albacares Bonnaterre, 1788 PADA PERIKANAN SKALA KECIL DI PALABUHANRATU, JAWA BARAT

    Directory of Open Access Journals (Sweden)

    Erfind Nurdin

    2015-09-01

    Full Text Available Pemanfaatan sumber daya perikanan tuna skala kecil di Pelabuhan Perikanan Nusantara (PPN Palabuhanratu menggunakan armada pancing tonda (troll liners dengan mengoperasikan lima macam jenis pancing. Penelitian perikanan tuna skala kecil dilakukan di PPN Pelabuhanratu pada April – Juli 2015, dengan tujuan untuk menganalisa produktivitas (laju tangkap, faktor yang mempengaruhi hasil tangkapan dan musim penangkapan madidihang (yellowfin tuna. Laju tangkap (hasil tangkapan per trip digunakan sebagai indikator produktivitas, moving average persentage digunakan untuk mengetahui pola musim penangkapan, dan fungsi produksi (Cobb Douglas untuk mengidentifikasi faktor-faktor teknis yang mempengaruhi hasil tangkapan tuna pada perikanan pancing tonda. Hasil penelitian menunjukkan bahwa madidihang merupakan hasil tangkapan paling dominan armada pancing tonda dengan laju tangkap sebanyak 339,93 kg/trip dengan musim penangkapan terjadi pada Mei hingga Oktober. Analisa Cobb Douglas menunjukkan secara simultan 84% hasil produksi (dependent variable yang diperoleh, dipengaruhi secara bersama oleh variabel independen yang digunakan (BBM, kekuatan mesin, GT dan jumlah ABK. The utilization of tuna resources on small scale (artisanal fishery in Palabuhanratu is using trolling fishing fleets (trolling liners characterized by five types of fishing lines during their operation. Research on small scale tuna fishery was conducted at Pelabuhanratu fishing port on April to July 2015 with the aims to analyze the productivity (catch rate, variable effects on the catch and fishing season for yellowfin tuna. The catch rate (the catch per trip is used as productivity indicator, while the moving average percentage is used to determine the pattern of fishing season, and Cobb Douglas production function to identify the technical factors that influence to the catch of yellowfin tuna. Analysis result showed that the catch rate of yellowfin tuna by trolling liners

  7. Low-temperature transitions in cod and tuna determined by differential scanning calorimetry

    DEFF Research Database (Denmark)

    Jensen, Kristina Nedenskov; Jørgensen, Bo; Nielsen, Jette

    2003-01-01

    Differential scanning calorimetry measurements have revealed different thermal transitions in cod and tuna samples. Transition temperatures detected Lit -11degreesC, -15degreesC and -21degreesC were highly dependent on the annealing temperature. In tuna muscle an additional transition was observe...

  8. Implications of new economic policy instruments for tuna management in the Western and Central Pacific

    NARCIS (Netherlands)

    Yeeting, A.D.; Bush, S.R.; Ram-Bidesi, V.; Bailey, M.L.

    2015-01-01

    Tuna management in the Western and Central Pacific is complicated by the conflicting interests of countries and agents exploiting tuna resources in the region. Historically, regulatory attempts by Pacific Island Countries to control fishing effort within their Exclusive Economic Zones (EEZs) have me

  9. DISTRIBUSI UKURAN TUNA HASIL TANGKAPAN PANCING LONGLINE DAN DAERAH PENANGKAPANNYA DI PERAIRAN LAUT BANDA

    Directory of Open Access Journals (Sweden)

    Umi Chodrijah

    2016-04-01

    Full Text Available Pemanfaatan sumber daya ikan tuna di perairan Laut Banda sudah berlangsung lama. Penelitian tentang komposisi jenis hasil tangkapan dan distribusi ukuran tuna hasil tangkapan longline di perairan Laut Banda yang didaratkan di Pelabuhan Benoa dilakukan pada bulan Februari, Juni, Oktober dan November 2011. Hasil penelitian menunjukkan bahwa hasil tangkapan longline yang dominan dari perairan Laut Banda adalah madidihang dan tuna mata besar. Ukuran madidihang yang tertangkap berada pada kisaran 95–165 FLcm dengan modus pada ukuran 105 FLcm dan tuna mata besar pada kisaran 75–185 FLcm dengan modus 115 dan 125 FLcm. Daerah penangkapan kapal longline di perairan Laut Banda berada pada koordinat 5–60 LS dan 124-1280 BT. Utilization of tuna resources in the Banda Sea waters had been conducting on since long time ago. Research on species composition and size distribution caught by tuna longline in the Banda Sea waters that landed in the port of Benoa  was conducted in February, June, October and November 2011. The results showed that the caught of dominant fish from longline in the Banda Sea waters were yellowfin and bigeye tuna. Size of yellowfin caught was 95–165 FLcm with a mode size of 105 FLcm and bigeye tuna was 75–185 FLcm with mode 115 and 125 FLcm. The fishing ground of longline vessels in the Banda Sea waters were 5–60 S and 124–1280 E.

  10. 76 FR 31351 - Safety Requirements and Manning Exemption Eligibility on Distant Water Tuna Fleet Vessels

    Science.gov (United States)

    2011-05-31

    ... SECURITY Coast Guard Safety Requirements and Manning Exemption Eligibility on Distant Water Tuna Fleet... availability of Office of Vessel Activities Policy Letter 11-05 regarding Distant Water Tuna Fleet vessels manning exemption eligibility and safety requirements. This final policy clarifies the requirements...

  11. Can Cooperative Management of Tuna Fisheries in the Western Pacific Solve the Growth Overfishing Problem?

    NARCIS (Netherlands)

    Bailey, M.L.; Rashid Sumaila, U.; Martell, S.J.D.

    2013-01-01

    Tuna fisheries in the western and central Pacific Ocean are important globally for both food and economic security. Yellowfin and bigeye tuna stocks in this region are declining, in part due to the juvenile bycatch of these species by the purse seine fishery using floating objects and fish aggregati

  12. 两种延绳钓钓具大眼金枪鱼捕捞效率的比较%A comparison of fishing efficiency on bigeye tuna of two longline fishing gears

    Institute of Scientific and Technical Information of China (English)

    宋利明; 杨嘉樑; 胡振新; 吕凯凯

    2011-01-01

    研究延绳钓钓具的有效捕捞努力量和捕捞效率,有助于提高CPUE标准化的精度、减少非目标色种的兼捕.2009年10月-12月,在基里巴斯吉尔伯特群岛海域进行了调查.调查中使用传统钓具和试验钓具.根据各深度段内大眼金枪鱼(Thunnus obesus)的渔获率(CPUE)估计其栖息地偏好指数,利用"确定性栖息地模型"估计捕捞大眼金枪鱼的有效努力量,应用T检验分析该海域延绳钓试验钓具和传统钓具的捕捞效率,对钓具的改进提出建议.结果表明:(1)试验钓具的名义CPUE大于传统钓具的名义CPUE,两种钓具的有效捕捞努力量明显小于各自对应的名义捕捞努力量,且存在显著差异;(2)试验钓具大眼金枪鱼的捕捞效率高于传统钓具;(3)当以大眼金枪鱼为目标鱼种时,建议使用试验钓具,以提高捕捞效率;(4)不同的钓具对同一鱼种的捕捞效率不同,大眼金枪鱼在不同深度段的分布可以估计其环境偏好和钓具的捕捞效率,"确定性栖息地模型"可用于CPUE的标准化以提高有关鱼种资源评估的精度.%It could be beneficial to reducing the incidental catch of non-target species, and improving the accuracy of CPUE standardization to study on the effective fishing effort and fishing efficiency of the longline fishing gears.A survey on tuna longline fishery has been conducted in waters near Gilbert Islands from October to December 2009.The traditional and experimental fishing gears were used in the survey.The bigeye tuna (Thunnus obesus) nominal CPUE in the different depth classes were used to estimate its habitat preference.The “deterministic habitat based standardization” was applied to estimate the effective fishing effort of the traditional and experimental fishing gears.The difference of the fishing efficiency between the traditional and experimental fishing gears was tested by the T-test.This study suggested that: ( 1 ) There was significant difference between

  13. Preliminary study on age and growth of north Pacific albacore Thunnus alalunga%北太平洋长鳍金枪鱼年龄与生长初步研究

    Institute of Scientific and Technical Information of China (English)

    江建军; 许柳雄; 朱国平; 朱伟俊

    2016-01-01

    The north Pacific albacore Thunnus alalunga is one of the main target species of tuna fisheries,the conservation and management of its resources has caught increasing attention by regional tuna management organizations.The fish age identification is an important content of fishery resources research.There is a need for a simple practical and accurate aging method to document the population structure,age and growth of the north Pacific albacore.We collected 227 vertebrae samples of albacore in the North Pacific between 2013 and 2014,divided them into four groups for age identification in the experiment by different dyeing methods and then used linear model,exponential model and power index model to fit the relationship between the fork length and radius of vertebrae,the best historical and fitting model was chosen to calculate the Von Bertalanffy growth equation for the North Pacific albacore.Results indicated that the fork length of albacore ranged from 52 cm to 104 cm,with the average fork length of 84.79 ±4.951 cm,the dominant fork length (83.1%)was between 81 -90 mm.The fork length of female albacore ranged from 63 cm to 104 cm,with the average fork length 84.43 ±5.274 cm and the dominant length (81.82%)was between 81 -90 mm.The fork length of male albacore ranged from 52 cm to 96 cm,with the average fork length 85 .23 ±4.642 cm and the dominant fork length(80.86%)was between 81 -90 mm.The 5 and 6 age class accounted for 80.86% of the total number sampled .The single factor analysis of variance showes that there is no significant difference among four experiments in the identification of albacore age.However,the AIC index model of experimental group is lower than other three test groups,and it shows that the experimental group can better fit age-fork length relationship for albacore tuna. The Von Bertalanffy growth function is,Lt =109.180 2 [1 -e -0.2587 83(t-1.991 28)],ttp=2.25.%北太平洋长鳍金枪鱼(Thunnus alalunga)是金枪鱼渔业的主要捕捞

  14. Predicting the Distribution of Yellowfin Tuna in Philippine Waters

    Science.gov (United States)

    Perez, G. J. P.; Leonardo, E. M.

    2015-12-01

    The Philippines is considered as a major tuna producer in the Western and Central Pacific Ocean, both for domestic consumption and on industrial scale. However, with the ever-increasing demand of growing population, it has always been a challenge to achieve sustainable fishing. The creation of satellite-derived potential fishing zone maps is a technology that has been adopted by advanced countries for almost three decades already and has led to reduction in search times by up to 40%. In this study, a Generalized Additive Model (GAM) is developed to predict the distribution of the Yellowfin tuna species in seas surrounding the Philippines based on the Catch-Per-Unit-Effort (CPUE) index. Level 3 gridded chlorophyll-a and sea surface temperature from the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua satellite of the National Aeronautics and Space Administration (NASA) are the main input parameters of the model. Chlorophyll-a is linked with the presence of phytoplankton, which indicates primary productivity and suggests potential regions of fish aggregation. Fish also prefers to stay in regions where the temperature is stable, thus the sea surface temperature fronts serve as a guide to locate concentrations of fish school. Historical monthly tuna catch data from Western and Central Pacific Commissions (WCPFC) is used to train the model. The resulting predictions are converted to potential fishing zone maps and are evaluated within and beyond the historical time range of the training data used. Diagnostic tests involving adjusted R2 value, GAM residual plots and root mean square error value are used to assess the accuracy of the model. The generated maps were able to confirm locations of known tuna fishing grounds in Mindanao and other parts of the country, as well us detect their seasonality and interannual variability. To improve the performance of the model, ancillary data such as surface winds reanalysis from National Centers for

  15. An evaluation of mercury concentrations in three brands of canned tuna.

    Science.gov (United States)

    Gerstenberger, Shawn L; Martinson, Adam; Kramer, Joanna L

    2010-02-01

    There is widespread concern over the presence of Hg in fish consumed by humans. While studies have been focused on determining the Hg concentration in sport fish and some commercial fish, little attention has been directed to canned tuna; it is widely held that concentrations are low. In the present study, the amount of Hg present in canned tuna purchased in Las Vegas, Nevada, USA, was examined, and the brand, temporal variation, type, and packaging medium impacts on Hg concentrations in tuna were explored. A significant (p consumption (0.5 ppm), and 5% of the tuna exceeded the action level established by the U.S. Food and Drug Administration (U.S. FDA) (1.0 ppm). These results indicate that stricter regulation of the canned tuna industry is necessary to ensure the safety of sensitive populations such as pregnant women, infants, and children. According to the U.S. EPA reference dose of 0.1 microg/kg body weight per day and a mean Hg value of 0.619 ppm, a 25-kg child may consume a meal (75 g) of canned chunk white tuna only once every 18.6 d. Continued monitoring of the industry and efforts to reduce Hg concentrations in canned tuna are recommended. Environ.

  16. Cytochrome Oxidase I (COI) sequence conservation and variation patterns in the yellowfin and longtail tunas

    Digital Repository Service at National Institute of Oceanography (India)

    Kunal, S.P.; GirishKumar

    such as (longtail tuna). Although these two are different species, morphological differentiation can only be seen in mature individuals, hence misidentification may result in erroneous data set, which ultimately affect conservation strategies. The mitochondrial DNA...

  17. Microsatellite development and survey of genetic variation in skipjack tuna Katsuwonus pelamis

    Digital Repository Service at National Institute of Oceanography (India)

    Menezes, M.R.; Noguchi, D.; Nakajima, M.; Taniguchi, N

    A survey of five newly developed microsatellite DNA markers in skipjack tuna Katsuwonus pelamis revealed high levels of polymorphism in two samples off the west coast of India (Minicoy Island and Kochi coast) and one sample off the Japan coast...

  18. SWFSC/MMTD/ETP: Dolphin-Tuna Tracking Studies (DTTS) 1992-1993

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This research was designed to better understand the nature of the dolphin-tuna bond in the eastern tropical Pacific Ocean. In this study, researchers attempted to...

  19. STATUS STOK, EKSPLOITASI DAN OPSI PENGELOLAAN SUMBERDAYA IKAN TUNA DI LAUT BANDA

    Directory of Open Access Journals (Sweden)

    Agustinus Anung Widodo

    2015-05-01

    Full Text Available Laut Banda merupakan salah satu daerah penangkapan tuna yang potensial di Indonesia, Jenis alat tangkap yang digunakan terdiri dari pukat cincin, huhate, rawai tuna, pancing ulur dan pancing tonda. Hasil tangkapan tuna di Laut Banda meliputi cakalang, madidihang dan tuna mata besar. Sumberdaya tuna di Laut Banda diduga masih merupakan sub stok sumberdaya tuna di perairan Pasifik Tengah dan Barat. Hasil kajian stok tuna oleh Western and Central Pacific Fisheries Commission (WCPFC pada 2012 melaporkan bahwa stok cakalang dan madidihang tidak mengalami overfishing dan overfished, sedangkan tuna mata besar telah mengalami overfishing dan overfished. Hasil penelitian Pusat Penelitian Pengelolaan Perikanan dan Konservasi Sumber Daya Ikan (P4KSI pada 2012 menunjukkan madidihang dan tuna mata besar tertangkap pukat cincin, huhate serta kombinasi pancing ulur permukaan dan pancing tonda pada stadium yuwana, dengan indikasi nilai LcFmsy while YFT and SKJ are not in overfishing or overfished state. It was also reported by RCFMC that the size of catch of those species by various fishing gear indicating that value of Lctuna resource and market preference, so that to the best fishing practice for resource sustainability it is suggestted for tuna management in Banda sea should be not to develop and increase the effort for purse seine and may shift to pole line, hand line and/or troll line are still openated.

  20. Productivity and susceptibility analysis for species caught in Atlantic tuna fisheries

    OpenAIRE

    Arrizabalaga, Haritz; De Bruyn, Paul; Diaz, Guillermo A.; Murua, Hilario; Chavance, Pierre; Delgado de Molina, Alicia; Gaertner, Daniel; Ariz, Javier; Ruiz, Jon; Kell, Laurence T.

    2011-01-01

    Abstract - Ecological risk assessment is a useful methodology for assisting the management of fisheries from an ecosystem perspective. Atlantic tuna fisheries, managed by the International Commission for the Conservation of Atlantic Tunas (ICCAT), are economically important and interact with several bycatch species. In spite of these interactions, no comprehensive ecological risk assessment has been conducted for bycatch species caught in ICCAT fisheries. In this paper, we followed a two stag...

  1. Effects of frozen storage on survival of Staphylococcus aureus and enterotoxin production in precooked tuna meat.

    Science.gov (United States)

    Wu, Xulei; Su, Yi-Cheng

    2014-08-01

    This study investigated the survival of Staphylococcus aureus in precooked tuna meat for producing canned products during frozen storage (-20 ± 2 °C) as well as its growth and enterotoxin production at 35 to 37 °C after the storage. Samples (50 ± 5 g) of precooked albacore (loin, chunk, and flake) and skipjack (chunk and flake) tuna were inoculated with 5 enterotoxin-producing strains of S. aureus at a level of approximately 3.5 log CFU/g and individually packed in a vacuum bag after 3 h incubation at 35 to 37 °C. Vacuum-packed samples were stored in a freezer (-20 ± 2 °C) for 4 wk. The frozen samples were then thawed in 37 °C circulating water for 2 h and incubated at 35 to 37 °C for 22 h. Populations of S. aureus in all precooked tuna samples decreased slightly (enterotoxin was detected in any samples. However, enterotoxins were detected in albacore loin and other samples after 12 and 24 h of incubation at 35 to 37 °C, respectively. Frozen precooked tuna meat should be used for producing canned tuna within 6 to 8 h of thawing to avoid product spoilage and potential enterotoxin production by S. aureus in contaminated precooked tuna meat.

  2. First records of parasitic copepods (Crustacea, Siphonostomatoida) from marine fishes in Korea.

    Science.gov (United States)

    Venmathi Maran, B A; Soh, H Y; Hwang, U W; Chang, C Y; Myoung, J G

    2015-06-01

    The knowledge of the biodiversity of parasitic copepods in South Korea is increasing. Interestingly we report here, some parasitic copepods considered as the first record of findings from Korea. Nine species of parasitic copepods (Siphonostomatoida) including six genera of three different families [Caligidae (7), Lernaeopodidae (1), Lernanthropidae (1)] were recovered from eight species of wild fishes in Korea: 1) Caligus hoplognathi Yamaguti & Yamasu, 1959 (♀, ♂) from the body surface of barred knifejaw Oplegnathus fasciatus (Temminck & Schlegel); 2) Caligus lagocephali Pillai, 1961 (♀) from the gills of panther puffer Takifugu pardalis (Temminck & Schlegel); 3) Euryphorus brachypterus (Gerstaecker, 1853) (♀, ♂) from the opercular cavity of Atlantic bluefin tuna Thunnus thynnus (Linnaeus); 4) Euryphorus nordmanni Milne Edwards, 1840 (♀, ♂) from the opercular cavity of common dolphin fish Coryphaena hippurus Linnaeus; 5) Gloiopotes huttoni (Thomson) (♀, ♂) from the body surface of black marlin Istiompax indica (Cuvier); 6) Lepeophtheirus hapalogenyos Yamaguti & Yamasu, 1959 (♀) from the gill filaments of O. fasciatus; 7) Lepeophtheirus sekii Yamaguti, 1936 (♀, ♂) from the body surface of red seabream Pagrus major (Temminck & Schlegel); 8) Brachiella thynni Cuvier, 1830 (♀) from the body surface of longfin tuna or albacore Thunnus alalunga (Bonnaterre); 9) Lernanthropinus sphyraenae (Yamaguti & Yamasu, 1959) (♀) from the gill filaments of moon fish Mene maculata (Bloch & Schneider). Since the female was already reported in Korea, it is a new record for the male of C. hoplognathi. A checklist for the parasitic copepods of the family Caligidae, Lernaeopodidae and Lernanthropidae of Korea is provided.

  3. JENIS, UKURAN DAN DAERAH PENANGKAPAN HIU THRESHER (FAMILI ALOPIIDAE YANG TERTANGKAP RAWAI TUNA DI SAMUDERA HINDIA

    Directory of Open Access Journals (Sweden)

    Agustinus Anung Widodo

    2016-03-01

    Full Text Available Sebagai anggota Indian Ocean Tuna Commision (IOTC Indonesia wajib mengadopsi isi Resolusi IOTC 10/12 yang mengatur pengelolaan sumberdaya ikan hiu thresher (famili Alopiidae. Secara spesifik Indonesia belum melaksanakan pengelolaan sumberdaya hiu thresher karena spesies tersebut belum mendapatkan perhatian serius. Tulisan ini bermaksud menyampaikan hasil penelitian tentang ikan hiu thresher (Famili Alopiidae yang tertangkap rawai tuna di Samudera Hindia berbasis di Cilacap. Data diperoleh dari kegiatan pengambilan contoh di pelabuhan tahun 2010, kegiatan observasi di atas kapal rawai tuna bulan Januari 2010 dan laporan statistik PPS Cilacap tahun 2006-2010. Hasil kajian menunjukkan bahwa: (a di perairan Indonesia ada dua spesies dari tiga spesies hiu thresher yang ada di dunia, yaitu hiu monyet atau pelagic thresher (Alopias pelagicus Nakamura 1935 dan hiu paitan atau bigeye thresher (A. superciliosus Lowe 1840. Satu spesies lainnya yang belum pernah ditemukan adalah thinfin thresher (A.vulpinus Bonnaterre1788.  Dilihat dari teknologi rawai tuna yang digunakan, daerah sebaran hiu thresher sama dengan tuna di Samudera Hindia, sehingga sulit untuk menghindari tidak tertangkapnya hiu thresher oleh rawai tuna. Jumlah dari jenis hiu monyet yang tertangkap rawai tuna di Samudera Hindia berkisar 0,1-0,6 % dan hiu paitan berkisar 0,1-1,3 % dari total tangkapan. Ukuran hiu thresher yang tertangkap rawai tuna umumnya ikan yang telah dewasa (berkisar 54-74% dan diduga telah mengalami pemijahan. Hampir semua bagian hiu thresher dimanfaatkan sebagai bahan pangan dan farmasi. Selain dipasarkan di dalam negeri, ikan hiu thresher juga diekspor terutama siripnya ke manca negara dan terbanyak ke China.   As a member of IOTC, Indonesia is obliged to implement all IOTC’s resolutions including resolution 10/12 on the conservation of thresher sharks (Family Alopiidae caught in association with fisheries in the IOTC area of competence. Indonsia has not

  4. Modelling the spatial behaviour of a tropical tuna purse seine fleet.

    Directory of Open Access Journals (Sweden)

    Tim K Davies

    Full Text Available Industrial tuna fisheries operate in the Indian, Atlantic and Pacific Oceans, but concerns over sustainability and environmental impacts of these fisheries have resulted in increased scrutiny of how they are managed. An important but often overlooked factor in the success or failure of tuna fisheries management is the behaviour of fishers and fishing fleets. Uncertainty in how a fishing fleet will respond to management or other influences can be reduced by anticipating fleet behaviour, although to date there has been little research directed at understanding and anticipating the human dimension of tuna fisheries. The aim of this study was to address gaps in knowledge of the behaviour of tuna fleets, using the Indian Ocean tropical tuna purse seine fishery as a case study. We use statistical modelling to examine the factors that influence the spatial behaviour of the purse seine fleet at broad spatiotemporal scales. This analysis reveals very high consistency between years in the use of seasonal fishing grounds by the fleet, as well as a forcing influence of biophysical ocean conditions on the distribution of fishing effort. These findings suggest strong inertia in the spatial behaviour of the fleet, which has important implications for predicting the response of the fleet to natural events or management measures (e.g., spatial closures.

  5. Modelling the spatial behaviour of a tropical tuna purse seine fleet.

    Science.gov (United States)

    Davies, Tim K; Mees, Chris C; Milner-Gulland, E J

    2014-01-01

    Industrial tuna fisheries operate in the Indian, Atlantic and Pacific Oceans, but concerns over sustainability and environmental impacts of these fisheries have resulted in increased scrutiny of how they are managed. An important but often overlooked factor in the success or failure of tuna fisheries management is the behaviour of fishers and fishing fleets. Uncertainty in how a fishing fleet will respond to management or other influences can be reduced by anticipating fleet behaviour, although to date there has been little research directed at understanding and anticipating the human dimension of tuna fisheries. The aim of this study was to address gaps in knowledge of the behaviour of tuna fleets, using the Indian Ocean tropical tuna purse seine fishery as a case study. We use statistical modelling to examine the factors that influence the spatial behaviour of the purse seine fleet at broad spatiotemporal scales. This analysis reveals very high consistency between years in the use of seasonal fishing grounds by the fleet, as well as a forcing influence of biophysical ocean conditions on the distribution of fishing effort. These findings suggest strong inertia in the spatial behaviour of the fleet, which has important implications for predicting the response of the fleet to natural events or management measures (e.g., spatial closures).

  6. CFD Simulation of Flow Features and Vorticity Structures in Tuna-Like Swimming

    Institute of Scientific and Technical Information of China (English)

    YANG Liang; SU Yu-min

    2011-01-01

    The theoretical research on the propulsive principle of aquatic animal becomes more important and attracted more researchers to make efforts on it.In the present study,a computational fluid dynamic(CFD)simulation of a three-dimensional traveling-wave undulations body of tuna has been developed to investigate the fluid flow features and vorticity structures around this body when moving in a straight line.The undulation only takes place in the posterior half of the fish,and the tuna-tail is considered as a lunate fin oscillating with the mode combined swaying with yawing.A Reynolds-averaged Navier-Stokes(BANS)equation is developed,employing a control-volume method and a k-omega SST turbulent model;meanwhile an unstructured tetrahedral grid,which is generated for the three-dimensional geometry,is used based on the deformation of the hind parts of the body and corresponding movement of the tail.We calculated the hydrodynamic performance of tuna-like body when a tuna swims in a uniform velocity,and compared the input power coefficient,output power coefficient and propulsive efficiency of the oscillating tuna-tail with or without body vortex shedding.Additionally,the load distribution on the body,flow features and vorticity structures around the body were demonstrated.The effect of interaction between the body-generated vortices and the tail-generated vorticity on the hydrodynamic performance can be obtained.

  7. 75 FR 48941 - General Advisory Committee to the U.S. Section to the Inter-American Tropical Tuna Commission...

    Science.gov (United States)

    2010-08-12

    ... Scientific Advisory Subcommittee to the U.S. Section to the Inter- American Tropical Tuna Commission (IATTC.... Section to the Inter- American Tropical Tuna Commission; Meeting Announcement AGENCY: National Marine... Committee (GAC) and a Scientific Advisory Subcommittee (SAS) to the U.S. Section to the IATTC. The...

  8. Comparison of natural polyphenol antioxidants from extra virgin olive oil with synthetic antioxidants in tuna lipids during thermal oxidation.

    Science.gov (United States)

    Medina, I; Satué-Gracia, M T; German, J B; Frankel, E N

    1999-12-01

    Polyphenols extracted from extra virgin olive oil (EVOO) were tested for their ability to inhibit lipid oxidation of canned tuna. Hydroperoxide formation during oxidation was monitored by measurement of peroxide value and decomposition of hydroperoxides by static headspace gas chromatographic analysis of volatiles. In tuna oxidized at 40 and 100 degrees C, 400 ppm of the EVOO polyphenols was an effective antioxidant as compared with 100 ppm of a 1:1 mixture of the synthetic antioxidants butylated hydroxytoluene and butylated hydroxyanisole. However, at concentrations oxidation rate in tuna muscle packed in brine was higher than that of tuna packed in refined olive oil. The EVOO polyphenols had higher antioxidant activity in the brine samples than in the refined olive oil. The higher antioxidant activity of EVOO polyphenols in tuna packed in brine may be explained by their greater affinity toward the more polar interface between water and the fish oil system.

  9. DYNAMICS OF GEARS, FLEETS, CATCH AND FISHING SEASON OF SMALLSCALE TUNA FISHERIES IN LABUHAN LOMBOK, WEST NUSA TENGGARA

    Directory of Open Access Journals (Sweden)

    Bram Setyadji

    2015-12-01

    Full Text Available In Indonesia, about 80% of fishing activities are small-scale and play major role both economically and socially. Previous studies mostly concentrated in Java, while in eastern part of Indonesia the information still scarce and limited. The study was conducted from January to December 2013, describes in detail the gears, fleets and catch dynamics of the small-scale tuna fisheries operating based in Labuhan Lombok Coastal Fishing Port (PPP. Labuhan Lombok. Small-scale tuna fishery in Labuhan Lombok are characterized by the small boats less than 10 GT, operating both troll line and hand line simultaneously, targeting large tuna, skipjack tuna and small tuna. Fishing season starts from April to August and influence by southwest monsoon wind and the presence of middleman as the connector between fishers and the market are the main character of the small-scale fisheries business in this area.

  10. Notes on helminth parasites of tuna fishes (Scombridae in Brazil Notas sobre los helmintos parásitos del atún (Scombridae en Brasil

    Directory of Open Access Journals (Sweden)

    Márcia Cristina Nascimento-Justo

    2012-03-01

    Full Text Available Four species of Scombridae from the coast of Rio de Janeiro, southwest Atlantic Ocean were found to be parasitized with species of Didymozoidae (Digenea: Thunnus atlanticus (Lesson a new host record for Nephrodidymotrema ahi Yamaguti, 1970, Didymocystis neothunni (Yamaguti, 1970, and Didymozoon longicolle (Yamaguti, 1970; Thunnus obesus (Lowe parasitized by Didymozoon longicolle and reported as a new host for Nephrodidymotrema ahi; Thunnus albacares (Bonaterre parasitized by Nephrodidymotrema ahi, and Katsuwonus pelamis (Linnaeus by Didymozoon longicolle. Measurements, figures, and parameters of infection are presented.Cuatro especies de Scombridae de la costa de Río de Janeiro, suroeste del océano Atlántico, se reportan parasitados con diferentes especies de Didymozoidae (Digenea: Thunnus atlanticus (Lesson un registro de nuevo huésped para Nephrodidymotrema ahi Yamaguti, 1970, Didymocystis neothunni (Yamaguti, 1970 y para Didymozoon longicolle (Yamaguti, 1970; Thunnus obesus (Lowe parasitado por Didymozoon longicolle, se indica como nuevo huésped para Nephrodidymotrema ahi; Thunnus albacares (Bonaterre parasitados por Nephrodidymotrema ahi y Katsuwonus pelamis (Linnaeus por Didymozoon longicolle. Se presentan las mediciones, las figuras y los parámetros de la infección.

  11. Génesis de la medicina familiar en Las Tunas

    Directory of Open Access Journals (Sweden)

    Maritza Rodríguez Peña

    2014-08-01

    Full Text Available Se realizó una investigación desde los presupuestos de la historia social integral, con el objetivo de analizar momentos importantes de la historia de la medicina familiar en la localidad de Las Tunas. Para la investigación se consultaron diversas fuentes documentales, orales, iconográficas, patrimoniales y bibliográficas, entre ellas la obra de los historiadores de la ciudad y del Ministerio de Salud Pública, así como resultados científicos de proyectos de investigación. Los métodos empleados partieron de la observación, el análisis histórico-lógico, la síntesis, la inducción y la deducción de la información, que permitieron la sistematización y determinación de los momentos más importantes de este proceso desde su origen en la comunidad primitiva, transitando por diferentes etapas hasta 1984, con la puesta en práctica del Programa del Médico y la Enfermera de la Familia, para el fortalecimiento de la atención primaria de salud, con marcado acento preventivo

  12. Application of transfer functions to canned tuna fish thermal processing.

    Science.gov (United States)

    Ansorena, M R; del Valle, C; Salvadori, V O

    2010-02-01

    Design and optimization of thermal processing of foods need accurate dynamic models to ensure safe and high quality food products. Transfer functions had been demonstrated to be a useful tool to predict thermal histories, especially under variable operating conditions. This work presents the development and experimental validation of a dynamic model (discrete transfer function) for the thermal processing of tuna fish in steam retorts. Transfer function coefficients were obtained numerically, using commercial software of finite elements (COMSOL Multiphysics) to solve the heat transfer balance. Dependence of transfer function coefficients on the characteristic dimensions of cylindrical containers (diameter and height) and on the sampling interval is reported. A simple equation, with two empirical parameters that depends on the container dimensions, represented the behavior of transfer function coefficients with very high accuracy. Experimental runs with different size containers and different external conditions (constant and variable retort temperature) were carried out to validate the developed methodology. Performance of the thermal process simulation was tested for predicting internal product temperature of the cold point and lethality and very satisfactory results were found. The developed methodology can play an important role in reducing the computational effort while guaranteeing accuracy by simplifying the calculus involved in the solution of heat balances with variable external conditions and emerges as a potential approach to the implementation of new food control strategies leading not only to more efficient processes but also to product quality and safety.

  13. Modeling the Spatial Dynamics of International Tuna Fleets

    Science.gov (United States)

    2016-01-01

    We developed an iterative sequential random utility model to investigate the social and environmental determinants of the spatiotemporal decision process of tuna purse-seine fishery fishing effort in the eastern Pacific Ocean. Operations of the fishing gear mark checkpoints in a continuous complex decision-making process. Individual fisher behavior is modeled by identifying diversified choices over decision-space for an entire fishing trip, which allows inclusion of prior and current vessel locations and conditions among the explanatory variables. Among these factors are vessel capacity; departure and arrival port; duration of the fishing trip; daily and cumulative distance travelled, which provides a proxy for operation costs; expected revenue; oceanographic conditions; and tons of fish on board. The model uses a two-step decision process to capture the probability of a vessel choosing a specific fishing region for the first set and the probability of switching to (or staying in) a specific region to fish before returning to its landing port. The model provides a means to anticipate the success of marine resource management, and it can be used to evaluate fleet diversity in fisher behavior, the impact of climate variability, and the stability and resilience of complex coupled human and natural systems. PMID:27537545

  14. Leaching of Oil from Tuna Fish Liver by Using Solvent of Methyl-Ethyl Ketone

    Directory of Open Access Journals (Sweden)

    Mirna Rahmah Lubis

    2013-12-01

    Full Text Available Research of oil leaching from Tuna Fish Liver has been carried out by extracting of tuna fish liver in soxhlet by using methyl-ethyl ketone as solvent. Liver of fresh tuna fish is blended, put into soxhlet, and extracted at temperatures of 60oC, 65oC, 70oC, 75oC, and 80oC. After obtaining the oil, separation between solvent and oil is carried out by distillation. Oil obtained is analyzed by testing the yield, acid number, Iodine value, viscosity, and its impurities content. Yield obtained is influenced by temperature and time of leaching. Both variables indicates that the higher the variables, the more fish liver oil obtained. Maximum yield obtained is 25.552% at operating condition of leaching temperature 80oC, and leaching duration of 5 hours.

  15. Performance variation due to stiffness in a tuna-inspired flexible foil model.

    Science.gov (United States)

    Rosic, Mariel-Luisa N; Thornycroft, Patrick J M; Feilich, Kara L; Lucas, Kelsey N; Lauder, George V

    2017-01-17

    Tuna are fast, economical swimmers in part due to their stiff, high aspect ratio caudal fins and streamlined bodies. Previous studies using passive caudal fin models have suggested that while high aspect ratio tail shapes such as a tuna's generally perform well, tail performance cannot be determined from shape alone. In this study, we analyzed the swimming performance of tuna-tail-shaped hydrofoils of a wide range of stiffnesses, heave amplitudes, and frequencies to determine how stiffness and kinematics affect multiple swimming performance parameters for a single foil shape. We then compared the foil models' kinematics with published data from a live swimming tuna to determine how well the hydrofoil models could mimic fish kinematics. Foil kinematics over a wide range of motion programs generally showed a minimum lateral displacement at the narrowest part of the foil, and, immediately anterior to that, a local area of large lateral body displacement. These two kinematic patterns may enhance thrust in foils of intermediate stiffness. Stiffness and kinematics exhibited subtle interacting effects on hydrodynamic efficiency, with no one stiffness maximizing both thrust and efficiency. Foils of intermediate stiffnesses typically had the greatest coefficients of thrust at the highest heave amplitudes and frequencies. The comparison of foil kinematics with tuna kinematics showed that tuna motion is better approximated by a zero angle of attack foil motion program than by programs that do not incorporate pitch. These results indicate that open questions in biomechanics may be well served by foil models, given appropriate choice of model characteristics and control programs. Accurate replication of biological movements will require refinement of motion control programs and physical models, including the creation of models of variable stiffness.

  16. Bycatch in the tuna purse-seine fisheries of the western Indian Ocean

    OpenAIRE

    Evgeny V Romanov

    2002-01-01

    Bycatch taken by the tuna purse-seine fishery from the Indian Ocean pelagic ecosystem was estimated from data collected by scientific observers aboard Soviet purse seiners in the western Indian Ocean (WIO) during 1986–92. A total of 494 sets on free-swimming schools, whale-shark-associated schools, whale-associated schools, and log-associated schools were analyzed. More than 40 fish species and other marine animals were recorded. Among them only two species, yellow-fin and skipjack tunas, wer...

  17. Synthesis of Monoacylglycerol Rich in Polyunsaturated Fatty Acids from Tuna Oil with Immobilized Lipase AK

    DEFF Research Database (Denmark)

    Pawongrat, Ratchapol; Xu, Xuebing; H-Kittikun, Aran

    2007-01-01

    The aim of this study was to produce monoacylglycerols (MAG) rich in polyunsaturated fatty acids (PUFA), especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), by glycerolysis of tuna oil with lipase AK from Pseudomonas fluorescence immobilized on Accurel EP-100 (IM-AK). tert...... on tuna oil. The temperature was controlled at 45 degrees C. Under these conditions, with a 24 h reaction, the yield of MAG was 24.6%, but containing 56.0 wt% PUFA (EPA and DHA). Stability of the IM-AK was also studied. The hydrolytic activity of the enzyme remained at 88% and 80% of initial activity...

  18. Population genetics of tunas in South China Sea inferred from control regions%南海大眼金枪鱼和黄鳍金枪鱼的群体遗传结构

    Institute of Scientific and Technical Information of China (English)

    王中铎; 郭昱嵩; 颜云榕; 侯刚; 范艳波; 冯波; 卢伙胜; 刘楚吾

    2012-01-01

    The South China Sea( SCS)surrounded by the first island chain is a semi-enclosed sea linking the Indian Ocean and the Pacific Ocean. The population genetic features of the two most important economic species,yellowfin tuna( YFT, Thunnus albacares, 17 adults and 44 juveniles) and big eye tuna( BET, T. obesus,22 adults and 4 juveniles)in SCS(11 -12°N,15°N;110 -112°E) ,have been analyzed based on the partial mitochondrial D-loop sequences. Our data supported the following conclusions: (1) both species were high nucleotide variation with very high haplotype diversities(Hd >99% ) .while the evidence from fixation indexes, and cluster trees showed the population diversity of BET was higher than those of YFT; (2) For BET and YFT,the strongest gene flow between populations in SCS and the Indian Ocean were 51.638 and 261.280 10,then the Pacific by 10.868 8 and -50.801 81,respectively;(3) both species obey the sudden expansion model. Contrasted with the unimodal of YFT, the mismatch distribution of BET, as well as the SCS population,were bimodal. Moreover, the spanning time of SCS population of BET was later inferred from the Tau ( = 7. 902) with biggest spanning scale ((0)1/(0)0 = 99 999/14. 752 ). The results should be basic information for fisheries management, fishing quotas determination as well for aquaculture of tuna.%测定了南海西沙和南沙群岛附近海区(11~12°N,15°N;110~112°E)黄鳍金枪鱼61尾(17尾成鱼、44尾幼鱼)和大眼金枪鱼26尾(22尾成鱼、4尾幼鱼)的线粒体基因组控制区部分序列(D-loop),结合GenBank数据库中印度洋、太平洋和大西洋群体的同源数据,分析结果:(1)黄鳍金枪鱼与大眼金枪鱼均具极高的单倍型多样性(Hd>99%),聚类树及群体间分化指数(FST和Snn)表明大眼金枪鱼群体分化程度明显高于黄鳍金枪鱼群体;(2)大眼金枪鱼和黄鳍金枪鱼的南海群体与印度洋群体之间基因流最强(Nm =51.638和261.28010),

  19. The Handling System of Product and Existence of Waste Components in Fishing Operation of Tuna in Bitung, North Sulawesi

    Directory of Open Access Journals (Sweden)

    Mustaruddin Mustaruddin

    2016-04-01

    Full Text Available Handling in fishing vessel is urgent to maintaining the quality of tuna products, while the existenceof waste components can bother the performance of fishing operations. The aims of this research are toevaluate the handling system of tuna products in fishing vessel and to analyze the influences of fishingoperation to the existence of waste components. This research methods are no control chart and regressionmodel approach. Research result shows that the handling system in the fishing operation of tuna in Bitungis not optimum. But the quality of tuna products which landed is still in controlled as shown by amountof rejecting products in UCL-LCL range (0 – 3,63 reject products/processing. The influence of amount oftuna caught per setting (X to existence of bait waste (Y formulated with model Y = - 1,176X+37.794, theinfluence of amount of tuna products (X to the existence of ices remained Y formulated with model Y =- 0,002X + 62,226, and also the influences of fishing operation which deputized by the amount of ABK (X1and number of operating days (X2 to the existence of freshwater remained (Y formulated with model Y= 50,000X1-23,704X2+288,889. The significant impacts are only the influence of amount of tuna productsin existence of ices remained (sigh = 0,036 and number of operating days of the existence of freshwaterremained (sigh = 0,037.Keywords: Bitung, waste components, handling system, tuna

  20. Study on the Tuna Long-Line Fishing——An Instance of Chinese Fleet in Eastern Indian Ocean%金枪鱼(Thunnus)延绳钓作业研究

    Institute of Scientific and Technical Information of China (English)

    叶振江; 邢智良; 高志军

    2001-01-01

    This paper reports the situation of the long-line fishi ng whenChina National Fisheries Corporation worked in the eastern Indian Ocean from May, 1997 to May, 1999. The result showed that when calculated by number the yield per month waved from 49 to 175, the highest yield was in September, 1998 and the lowest yield was in May, 1995, the average yield being 116 per boat per year; when calculated by weight (net weight), the yield per month waved from 15 59 to 6306 kg, the highest yield was in Feb.1999, and the lowest yield was in May, 1997. The average yield was 4064 kg per boat per month. The get hooked rate per month fluctuated from 0.47% to 2.28% and the average was 1.02%. There is a prominent difference in boats and months. The average hooks cast by these boats ranged from 5208 to 15558.%报道中国水产总公司金枪鱼船队1997年5月至1999年5月期间在印度洋东部海域进行延绳钓作业的有关情况。结果显示:船均月产量,以尾数计在49~175尾之间波动,最高出现于1998年9月,最低出现于1997年5月,平均116尾/船·月;以重量(纯重)计在1559~6306kg之间波动,最高出现于1999年2月,最低出现于1997年5月,平均达4064kg/船·月。月均上钓率在0.47%~2.28%之间波动,平均1.02%,船间及月间差异显著。船月均下钓5208~15558个。

  1. Extraction of Fish Oil from Yellow Fin Tuna ( Thunnus albacares) head by Protease Hydrolysis%酶解法从黄鳍金枪鱼鱼头中提取鱼油的研究

    Institute of Scientific and Technical Information of China (English)

    刘书成; 章超桦; 洪鹏志; 吉宏武

    2007-01-01

    利用蛋白酶酶解法从黄鳍金枪鱼加工的下脚料--鱼头中提取鱼油.以鱼油提取率为指标,选择合适的蛋白酶,研究了酶解工艺条件对提取率的影响.研究结果表明:胰蛋白酶提取鱼油的酶解工艺参数为酶解温度50℃,酶添加量1%,底物浓度1:1,酶解时间4h,酶解pH值8.在此条件下,粗鱼油的提取率为4.22%,理化指标达到了SC/T3502-2000的粗鱼油二级标准,多不饱和脂肪酸总含量高达38.47%,其中DHA和EPA的含量分别为23.63%和4.84%.

  2. CONCENTRATION AND RECOVERY OF PROTEIN FROM TUNA COOKING JUICE BY FORWARD OSMOSIS

    Directory of Open Access Journals (Sweden)

    KHONGNAKORN W.

    2016-07-01

    Full Text Available Tuna cooking processing plants generate large amount of cooking juice containing a significant content of protein. Recovery and concentrating process of this valuable compound together with a low energy consumption process are of interest regarding full utilization concept and green process approach. Forward osmosis (FO was employed in this work to recover and concentrate tuna cooking juice. FO process could increase the protein concentration up to 9% with an average permeate flux of 2.54 L/m2h. The permeate flux however tended to decrease as protein concentration increased due to the impact of osmotic pressure of the feed and fouling on the membrane surface. Since tuna cooking juice consists of protein and minerals, membrane analyses indicated that fouling was more severe compared to the fouling caused by standard bovine serum albumin pure protein. However, the presence of minerals rendered it a quicker and lower energy process by comparison. These results indicated that FO is a promising technique in the recovery and concentration of tuna cooking juice protein.

  3. Life in 3-D: life history strategies in tunas, mackerels and bonitos

    OpenAIRE

    Juan-Jorda, Maria Jose; MOSQUEIRA SANCHEZ IAGO; Freire, Juan; Dulvy, Nicholas

    2012-01-01

    The scombrids (tunas, bonitos, Spanish mackerels and mackerels) sustain some of the most important fisheries in the world and their sustainable management depends on better understanding of their life history strategies. Here, we first assemble life history information on maximum size, growth, longevity, maturity, fecundity and spawning duration and interval for all scombrid species.

  4. Comparison of Private Incentive Mechanisms for Improving Sustainability of Filipino Tuna Fisheries

    NARCIS (Netherlands)

    Tolentino, Frazen; Berentsen, Paul; Bush, Simon; Idemne, Joseph; Babaran, Ricardo; Oude Lansink, Alfons

    2016-01-01

    This paper analyzes the influence of three private incentive mechanisms over decision making related to improved sustainability of fishing practices in Filipino tuna fisheries. The three mechanisms compared are the World Wildlife Fund for Nature's fishery improvement project model, Marine Steward

  5. 76 FR 283 - International Fisheries; Pacific Tuna Fisheries; Vessel Capacity Limit in the Purse Seine Fishery...

    Science.gov (United States)

    2011-01-04

    ... deliver their catch to U.S. (e.g., American Samoa) or foreign (e.g., Ecuador, Mexico, Colombia, Costa Rica... IATTC based on historical fishing levels in the EPO. The resolution included provisions that, among... requirements: (1) A vessel capacity limit for the U.S. purse seine fleet fishing for tuna and operating in...

  6. 76 FR 68332 - International Fisheries; Pacific Tuna Fisheries; Fishing Restrictions in the Eastern Pacific Ocean

    Science.gov (United States)

    2011-11-04

    .... (e.g., American Samoa) or foreign (e.g., Ecuador, Mexico, Colombia, Costa Rica) ports. Skipjack and...; Pacific Tuna Fisheries; Fishing Restrictions in the Eastern Pacific Ocean AGENCY: National Marine... Conservation 2011-2013 (C-11-01); the Resolution Prohibiting Fishing on Data Buoys (C-11-03); and...

  7. Determination of histamine in canned tuna by molecularly imprinted polymers-surface enhanced Raman spectroscopy.

    Science.gov (United States)

    Gao, Fang; Grant, Edward; Lu, Xiaonan

    2015-12-11

    We introduce a rapid, cost effective and reliable approach to determine histamine level in canned tuna. Molecularly imprinted polymers (MIPs) were synthesized as artificial antibodies towards histamine by utilizing the interaction between histamine and a functional monomer (methacrylic acid) to impress specific binding sites on polymer particles after polymerization. Polyvinyl chloride (PVC) was used to immobilize the MIPs, yielding a MIPs-PVC film that functioned as a recognition element to specifically separate histamine from tuna extract. A gold colloid solution served both as an eluting solvent to extract histamine from MIPs-PVC film and furnish a substrate for surface enhanced Raman spectroscopy (SERS) detection of histamine signals. Principal component analysis together with a partial least square regression (PLSR) model (R(2) = 0.947, RMSECV = 3.526) verified the reliability of MIPs-PVC-SERS approach for the detection and spectral analysis of histamine. Linear regression models were also constructed to relate the intensity of different histamine SERS bands with the corresponding spiking levels. One such model (using a band at 1576 cm(-1)) performed slightly better in predicting histamine content in tuna than the PLSR model. We conclude that our new MIPs-PVC-SERS approach can rapidly and reliably determine histamine at levels from 3 to 90 ppm in canned tuna meat.

  8. Gender Transformations and Colonial Displacements in Laura Antillano's "Tuna de mar"

    Science.gov (United States)

    Reid, Alana

    2015-01-01

    This paper examines the trajectories of two characters in Laura Antillano's short story, "Tuna de mar" (1991), as they navigate interrelated systems of power and attempt to position themselves closer to, or further away from, the margins. Set in the late eighteenth century, the tale features a female protagonist who escapes prostitution…

  9. HASIL TANGKAP SAMPINGAN (HTS KAPAL RAWAI TUNA DI SAMUDERA HINDIA YANG BERBASIS DI BENOA

    Directory of Open Access Journals (Sweden)

    Bram Setyadji

    2016-05-01

    Full Text Available Hasil tangkap sampingan (HTS hampir terdapat pada semua jenis perikanan tangkap di Indonesia, termasuk pada perikanan rawai tuna di Samudera Hindia. Kebanyakan jenis HTS merupakan spesies yang tidak diinginkan atau jenis ikan target tapi ukurannya di bawah standar yang diinginkan (yuwana atau ikan muda dan pada kasus tertentu merupakan jenis ikan yang terancam keberadaannya (Endangered species. Penelitian ini bertujuan untuk memberikan informasi tentang komposisi hasil tangkap sampingan, laju pancing dan hubungan antara tuna dengan ikan yang berasosiasi dengannya pada area penangkapan yang sama. Pengamatan dilakukan pada bulan Maret – Juli 2010 dengan mengikuti kegiatan operasi penangkapan 2 kapal rawai tuna komersial yang berbasis di Pelabuhan Benoa. Hasil penelitian menunjukkan terdapat 18 jenis hasil tangkap sampingan yang  didominasi dari family Alepisauridae; ikan naga (Alepisaurus sp.; Gempylidae; ikan gindara (oilfish, dan Dasyatidae; pari lumpur (Dasyatis spp.. Jenis ikan lain adalah ikan paruh panjang (billfish, berbagai jenis cucut dan pari, ikan teleostei, serta penyu lekang. Kebanyakan dari hasil tangkap sampingan merupakan by-product yang mempunyai nilai ekonomis tinggi kecuali jenis ikan naga dan pari lumpur yang merupakan discard/buangan.   By-catch products are mostly available in every kind of capture fisheries in Indonesia including tuna longline fisheries in Indian Ocean. Most of these are unwanted species or juvenile target fish, sometimes endangered species. The research intended to reveal the by-catch from tuna fisheries and its relationship between tuna and its associate in the same fishing ground. Surveillance was conducted on March – July, 2010 by following two commercial tuna longliners vessel based in Port of Benoa. The result showed that there were 18 by-catch species that managed to be retrieved and indentified, family Alepisauridae; lancetfish (Alepisaurus sp.; Gempylidae; oilfish (Ruvettus pretiosus, and

  10. A comparative study of thermal calcination and an alkaline hydrolysis method in the isolation of hydroxyapatite from Thunnus obesus bone.

    Science.gov (United States)

    Venkatesan, Jayachandran; Qian, Zhong Ji; Ryu, BoMi; Thomas, Noel Vinay; Kim, Se Kwon

    2011-06-01

    In the present study, hydroxyapatite (HAp) was isolated from Thunnus obesus bone using alkaline hydrolysis and thermal calcination methods. The obtained ceramic has been characterized by thermal gravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), powder x-ray diffraction analysis (XRD), field-emission scanning electron microscopy, energy-dispersive x-ray analysis, transmission electron microscopy (TEM), selected area diffraction analysis, cytotoxic analysis and cell proliferation analysis. The results indicate that there are significant differences between the ceramics and T. obesus bone. FT-IR and TGA results affirmed that the collagen and organic moieties have been eliminated by both the proposed methods. XRD results were in agreement with JCPDS data. TEM and selective area diffraction images have signified that the thermal calcination method produces good crystallinity with dimensions 0.3-1.0 µm, whereas the alkaline hydrolysis method produces nanostructured HAp crystals with 17-71 nm length and 5-10 nm width. Biocompatibility of HAp crystals was evaluated by cytotoxicity and cell proliferation with human osteoblast-like cell MG-63.

  11. Application of a Delay-Difference Model for the Stock Assessment of Southern Atlantic Albacore (Thunnus alalunga)

    Institute of Scientific and Technical Information of China (English)

    ZHANG Kui; LIU Qun; KALHORO Muhsan Ali

    2015-01-01

    Delay-difference models are intermediate between simple surplus-production models and complicated age-structured models. Such intermediate models are more efficient and require less data than age-structured models. In this study, a delay-differ- ence model was applied to fit catch and catch per unit effort (CPUE) data (1975–2011) of the southern Atlantic albacore (Thunnus alalunga) stock. The proposed delay-difference model captures annual fluctuations in predicted CPUE data better than Fox model. In a Monte Carlo simulation, white noises (CVs) were superimposed on the observed CPUE data at four levels. Relative estimate error was then calculated to compare the estimated results with the true values of parametersα andβ in Ricker stock-recruitment model and the catchability coefficientq.α is more sensitive to CV thanβandq. We also calculated an 80% percentile confidence interval of the maximum sustainable yield (MSY, 21756t to 23408t; median 22490t) with the delay-difference model. The yield of the southern Atlantic albacore stock in 2011 was 24122t, and the estimated ratios of catch against MSY for the past seven years were approxi-mately 1.0. We suggest that care should be taken to protect the albacore fishery in the southern Atlantic Ocean. The proposed de-lay-difference model provides a good fit to the data of southern Atlantic albacore stock and may be a useful choice for the assessment of regional albacore stock.

  12. Predicting Interactions between Common Dolphins and the Pole-and-Line Tuna Fishery in the Azores

    Science.gov (United States)

    Cruz, Maria João; Menezes, Gui; Machete, Miguel; Silva, Mónica A.

    2016-01-01

    Common dolphins (Delphinus delphis) are responsible for the large majority of interactions with the pole-and-line tuna fishery in the Azores but the underlying drivers remain poorly understood. In this study we investigate the influence of various environmental and fisheries-related factors in promoting the interaction of common dolphins with this fishery and estimate the resultant catch losses. We analysed 15 years of fishery and cetacean interaction data (1998–2012) collected by observers placed aboard tuna fishing vessels. Dolphins interacted in less than 3% of the fishing events observed during the study period. The probability of dolphin interaction varied significantly between years with no evident trend over time. Generalized additive modeling results suggest that fishing duration, sea surface temperature and prey abundance in the region were the most important factors explaining common dolphin interaction. Dolphin interaction had no impact on the catches of albacore, skipjack and yellowfin tuna but resulted in significantly lower catches of bigeye tuna, with a predicted median annual loss of 13.5% in the number of fish captured. However, impact on bigeye catches varied considerably both by year and fishing area. Our work shows that rates of common dolphin interaction with the pole-and-line tuna fishery in the Azores are low and showed no signs of increase over the study period. Although overall economic impact was low, the interaction may lead to significant losses in some years. These findings emphasize the need for continued monitoring and for further research into the consequences and economic viability of potential mitigation measures. PMID:27851763

  13. Heat resistance of histamine-producing bacteria in irradiated tuna loins.

    Science.gov (United States)

    Enache, Elena; Kataoka, Ai; Black, D Glenn; Weddig, Lisa; Hayman, Melinda; Bjornsdottir-Butler, Kristin

    2013-09-01

    Consumption of foods high in biogenic amines leads to an illness known as histamine, or scombrotoxin, poisoning. The illness is commonly associated with consumption of fish with high levels of histamine ( $ 500 ppm). The objective of this study was to determine and compare the heat resistance of five histamine-producing bacteria in irradiated albacore tuna loins. Heat-resistance parameters (D- and z-values) were determined for Morganella morganii, Raoultella planticola, Hafnia alvei, and Enterobacter aerogenes. D- or z-values were not determined for Photobacterium damselae, which was the most heat-sensitive organism in this study. P. damselae declined > 5.9 log CFU/g after a heat treatment of 50°C for 10 min, 54°C for 3 min, and 56°C for 0.5 min. M. morganii was the most heat-resistant histamine-producing bacteria in albacore tuna loins, followed by E. aerogenes, H. alvei, and R. planticola. M. morganii and E. aerogenes had the highest D(50°C), 49.7 ± 17.57 and 51.8 ± 17.38 min, respectively. In addition, M. morganii had the highest D-values for all other temperatures (54, 56, and 58°C) tested. D- and zvalues were also determined for M. morganii in skipjack tuna. While no significant (P > 0.05) difference was observed between D(54°C) and D(56°C) of M. morganii in either albacore or skipjack tuna, the D(58°C) (0.4 ± 0.17 min) was significantly lower (P canned-tuna processing environments.

  14. Visualizing the Food-Web Effects of Fishing for Tunas in the Pacific Ocean

    Directory of Open Access Journals (Sweden)

    Jefferson T. Hinke

    2004-06-01

    Full Text Available We use food-web models to develop visualizations to compare and evaluate the interactions of tuna fisheries with their supporting food webs in the eastern tropical Pacific (ETP and the central north Pacific (CNP Oceans. In the ETP and CNP models, individual fisheries use slightly different food webs that are defined by the assemblage of targeted tuna species. Distinct energy pathways are required to support different tuna species and, consequently, the specific fisheries that target different tuna assemblages. These simulations suggest that catches of tunas, sharks, and billfishes have lowered the biomass of the upper trophic levels in both systems, whereas increases in intermediate and lower trophic level animals have accompanied the decline of top predators. Trade-offs between fishing and predation mortality rates that occur when multiple fisheries interact with their respective food webs may lead to smaller changes in biomass than if only the effect of a single fishery is considered. Historical simulations and hypothetical management scenarios further demonstrate that the effects of longline and purse seine fisheries have been strongest in upper trophic levels, but that lower trophic levels may respond more strongly to purse-seine fisheries. The apex predator guild has responded most strongly to longlining. Simulations of alternative management strategies that attempt to rebuild shark and billfish populations in each ecosystem reveal that (1 changes in longlining more effectively recover top predator populations than do changes in purse seining and (2 restrictions on both shallow-set longline gear and shark finning may do more to recover top predators than do simple reductions in fishing effort.

  15. 中西太平洋长鳍金枪鱼(Thunnus alalunga)延绳钓渔场分布的时空变化%The Spatio-Temporal Changes in the Long-Line Fishing Grounds of Albacore (Thunnus alalunga) in Western and Central Pacific Ocean

    Institute of Scientific and Technical Information of China (English)

    唐衍力; 徐湛

    2015-01-01

    Albacore (Thunnus alalunga) is an important economic fish species in the long-line tuna fisheries in western and central Pacific Ocean, and it is also one of the major species that the Chinese long-line fleets target in this area. To explore the spatio–temporal changes in the fishing grounds of albacore and provide guidance to the long-line fishery practice, we studied the relationship between the catch per unit effort(CPUE), the monthly catch and the sea surface temperature(SST), and analyzed the geographical changes in the fishing grounds using the frequentness accumulation method. The statistical analysis was based on the data collected from 10 albacore long-line fishing vessels of China National Fisheries Corporation (CNFC) from Feb. 2011 to Jan. 2012, combined with the environmental factors such as the SST. The results showed that in western and central Pacific Ocean, the temperature at the depth of 200 m and 150 m remained stable in a year but SST fluctuated dramatically and thus had great effects on the distribution of fishing grounds and CPUE. In a year (Feb. 2011 to Jan. 2012) the fishing ground moved periodically from 14°S to 26°S then back to 14°S. To the north of 20°S the fishing ground existed all year long, and the high catch and high CPUE were present in the area where SST was 28–29℃. To the south of 23°S the fishing ground only existed from May to August because the adverse weather conditions in other months imperiled the fishing vessels, and the high catch and high CPUE were present in the area where SST was 22–24℃. In this time window the catch accounted for 27.6% of the yearly total catch while the fishing vessels worked for only 14.4% of the yearly total fishing days. Given the enhanced anti-wind and anti-wave features of fishing vessels and gears, a new sustainable fishing ground of albacore could be explored and exploited to the south of 25°S.%为提高中西太平洋金枪鱼延绳钓渔业作业效率和应对多变的渔业

  16. Anti-obesity effects of boiled tuna extract in mice with obesity induced by a high-fat diet.

    Science.gov (United States)

    Kim, Youngmin; Kwon, Mi-Jin; Choi, Jeong-Wook; Lee, Min-Kyeong; Kim, Chorong; Jung, Jaehun; Aprianita, Heny; Nam, Heesop; Nam, Taek-Jeong

    2016-10-01

    The aim of this study was to examine the anti-obesity effects of boiled tuna extract in C57BL/6N mice with obesity induced by a high-fat diet (HFD). We determined the anti-obesity effects of boiled tuna extract (100, 200, or 400 mg/kg) on the progression of HFD-induced obesity for 10 weeks. The mice were divided into 5 groups as follows: the normal diet (ND) group (n=10); the HFD group (n=10); the mice fed HFD and 100 mg/kg boiled tuna extract group (n=10); those fed a HFD and 200 mg/kg boiled tuna extract group (n=10); and those fed a HFD and 400 mg/kg boiled tuna extract group (n=10). Changes in body weight, fat content, serum lipid levels and lipogenic enzyme levels were measured. The consumption of boiled tuna extract lowered epididymal tissue weight and exerted anti-obesity effects, as reflected by the serum glucose, triglyceride (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL‑C), low-density lipoprotein cholesterol (LDL-C), insulin and leptin levels. In addition, we demonstrated changes in liver adipogenic- and lipogenic-related protein expression by western blot analysis. Boiled tuna extract downregulated the levels of the CCAAT/enhancer-binding protein α, β and δ (C/EBPα, β, δ), and peroxisome proliferator-activated receptor-γ (PPAR-γ) adipocyte marker genes. Boiled tuna extract also attenuated adipogenic and lipogenic gene expression, namely the levels of fatty acid synthase (FAS), lipoprotein lipase (LPL), acetyl-CoA carboxylase (ACC), glucose transporter type 4 (Glut4) and phosphorylated adenosine monophosphate-activated protein kinase α and β (AMPKα, β) in a dose-dependent manner. Moreover, the consumption of boiled tuna extract restored the levels of superoxide dismutase (SOD), catalase (CAT), glutamic oxaloacetic transaminase (GOT), glutamic-pyruvate transaminase (GPT), aspartate transaminase (AST) and alanine transaminase (ALT) to those of the control group. These results

  17. SIZE AND FISHING GROUND OFWAHOO (Acanthocybium solandri Cuvier, 1832 FROM CATCH DATA OF TUNA LONGLINE OPERATED IN INDIAN OCEAN

    Directory of Open Access Journals (Sweden)

    Agustinus Anung Widodo

    2012-12-01

    Full Text Available Wahoo (Acanthocybium solandri Cuvier, 1832 is a member of the Scombrid family, is a pelagic (open ocean species found worldwide in tropical and warm-temperate seas. It is fished throughout its range by artisanal, recreational, and commercial. Wahoo is one of the by-product species of the tuna long line fleets operate in Indian Ocean. This paper describes status of wahoo resource caught by tuna long line in Indian Ocean based at Benoa-Bali. Data obtained from onboard observer program on the tuna long liner based at Benoa-Bali during 2005-2010. Total of 85 trips of onboard observation were carried out with the total long line sets (one set per day were 2873 times. The data covered the horizontal and vertical position of tuna long line hooks caught the wahoo, hook rate and fish size distribution. Data of horizontal fishing positions (coordinates gained from the global positioning system availabled in the tuna long liners. The depth of the long line gear in the waters and teperature of waters were measured by mini-loggers TDR type SP2T-1200, brand: NKE Micrel. Hook rate of wahoo is calculated using the Klawe (1986 method. Result of research showed that the wahoos caught by tuna long lines based at Benoa spread horizontally between 1o31’-33o 40’S and 77o18’-117o53’E and spread vertically between the depth of 75.2- 285.7 m. From 85 tuna long line fishing trips, only about 50% of 85 tuna long line fishing trips caught wahoo with hook rate ranged 0.947-1.399 per 1000 hooks/setting. Size distribution of wahoo ranged 70-180cm with modus ranged 101-110cm.

  18. Influence of physical damage and freezing on histamine concentration and microbiological quality of yellowfin tuna during processing

    Directory of Open Access Journals (Sweden)

    Gonzalo García-Tapia

    2013-09-01

    Full Text Available Yellowfin tuna has a high level of free histidine in their muscle, which can lead to histamine formation by microorganisms if temperature abuse occurs during handling and further processing. The objective of this study was to measure levels of histamine in damaged and undamaged thawed muscle to determine the effect of physical damage on the microbial count and histamine formation during the initial steps of canning processing and to isolate and identify the main histamine-forming microorganisms present in the flesh of yellowfin tuna. Total mesophilic and psicrophilic microorganisms were determined using the standard plate method. The presence of histamine-forming microorganisms was determined in a modified Niven's agar. Strains were further identified using the API 20E kit for enterobacteriaceae and Gram-negative bacilli. Physically damaged tuna did not show higher microbiological contamination than that of undamaged muscle tuna. The most active histamine-forming microorganism present in tuna flesh was Morganella morganii. Other decarboxylating microorganisms present were Enterobacter agglomerans and Enterobacter cloacae. Physical damage of tune during catching and handling did not increase the level of histamine or the amount of microorganisms present in tuna meat during frozen transportation, but they showed a higher risk of histamine-forming microorganism growth during processing.

  19. Are Consumers Willing to Pay More for Sustainable Products? A Study of Eco-Labeled Tuna Steak

    Directory of Open Access Journals (Sweden)

    Guzhen Zhou

    2016-05-01

    Full Text Available A high demand for seafood leads to overfishing, harms the long-term health of seafood stocks, and threatens environmental sustainability in oceans. Sustainability certification is one of the major sustainability movements and is known as eco-labeling. For instance, in the tuna industry, leading tuna brands have committed to protecting sea turtles by allowing the tracing of the source of their tuna “from catch to can.” This paper relies on an Internet survey on consumers from Kentucky conducted in July 2010. The survey investigates household-level tuna steak (sashimi grade consumption and examines consumer preferences for eco-labeling (“Certified Turtle Safe” (CTS in this study while mimicking individuals’ seafood procurement processes. A random parameter logit model is utilized, and willingness-to-pay measures are calculated based on model estimation results. It was found that respondents on average preferred turtle-safe-labeled tuna steak and were likely to pay more for it; however, they were less likely to purchase wild-caught species, and insignificant results were found for pre-frozen. Moreover, significant heterogeneities were found across individuals regarding tuna steak purchases. The findings indicate evidence of public support for environmental friendliness, particularly with regard to eco-labeling.

  20. Oligonucleotide indexing of DNA barcodes: identification of tuna and other scombrid species in food products

    Directory of Open Access Journals (Sweden)

    Botti Sara

    2010-08-01

    Full Text Available Abstract Background DNA barcodes are a global standard for species identification and have countless applications in the medical, forensic and alimentary fields, but few barcoding methods work efficiently in samples in which DNA is degraded, e.g. foods and archival specimens. This limits the choice of target regions harbouring a sufficient number of diagnostic polymorphisms. The method described here uses existing PCR and sequencing methodologies to detect mitochondrial DNA polymorphisms in complex matrices such as foods. The reported application allowed the discrimination among 17 fish species of the Scombridae family with high commercial interest such as mackerels, bonitos and tunas which are often present in processed seafood. The approach can be easily upgraded with the release of new genetic diversity information to increase the range of detected species. Results Cocktail of primers are designed for PCR using publicly available sequences of the target sequence. They are composed of a fixed 5' region and of variable 3' cocktail portions that allow amplification of any member of a group of species of interest. The population of short amplicons is directly sequenced and indexed using primers containing a longer 5' region and the non polymorphic portion of the cocktail portion. A 226 bp region of CytB was selected as target after collection and screening of 148 online sequences; 85 SNPs were found, of which 75 were present in at least two sequences. Primers were also designed for two shorter sub-fragments that could be amplified from highly degraded samples. The test was used on 103 samples of seafood (canned tuna and scomber, tuna salad, tuna sauce and could successfully detect the presence of different or additional species that were not identified on the labelling of canned tuna, tuna salad and sauce samples. Conclusions The described method is largely independent of the degree of degradation of DNA source and can thus be applied to

  1. EVALUATION OF TUNA FISHING GROUND IN SOUTHERN COAST OF JAVA - SUMBAWA SEA USING SATELLITE OBSERVED DATA

    Directory of Open Access Journals (Sweden)

    MOKHLAS SATIBI

    2012-11-01

    Full Text Available Potential fishery in territorial water of South Java - Sumbawa Sea has not been exploited maximally. Tuna is one of fisherypotency in the territorial water of South Java - Sumbawa. Tuna is the important economic value because it represent one ofexporting commodity enthused by overseas consumer.Research was conducted in the Southern Java – Sumbawa, Indian Ocean 90 S - 160 S; 1060 E - 1210 E, using fish catch data2003 – 2006. Research location is in the inclusive Region of Fishery Management IX (DKP and PKSPL, 2003. Data weretaken from a daily fish catch of PT. Perikanan Samudra Besar (PSB Benoa Bali 2003 - 2006.Sea level anomaly (SLA data were estimated from Altimetry satellite (Jason 1, wind speed data was from Scatterometersatellite and sea surface temperature (SST data was from Microwave satellite.Based on the result of this research, sea level anomaly of southern coast of Java-Sumbawa was fluctuated according tomonsoon. The highest bigeye tuna fish catched was 40 tuna in June 2003 and the lowest bigeye tuna fish was 2 tuna inNovember 2005. Maximum SLA observe during southeast monsoon was 21.77 cm in august 2005, while minimum SLAobserved during southeast monsoon was -18.15 cm in October 2003. Sea surface temperature of southern coast of Java-Sumbawa also fluctuated according to monsoon. Maximum SST observed during northwest monsoon was 30.450 C in March2006, while minimum SST observed during southeast monsoon was 25.050 C in August 2006. The highest wind speed was10.20 m/sec in June 2004 and the lowest was 2.00 m/sec in October 2004. Wind direction was reversely changed according tomonsoon. Northwest wind monsoon flew eastward and southeast wind monsoon flew westward.Fish production in PT PSB had been done over 4 years since 2003, in northwest and southwest monsoon in constant areaand correlation of linier regression among estimate of fish catching using SLA, SST and wind speed had no correlation. Withfish production during southwest

  2. Numerical Study of Propulsion Mechanism for Oscillating Rigid and Flexible Tuna-Tails

    Institute of Scientific and Technical Information of China (English)

    Liang Yang; Yumin Su; Qing Xiao

    2011-01-01

    Numerical study on the unsteady hydrodynamic characteristics of oscillating rigid and flexible tuna-tails in viscous flow-field is performed.Investigations are conducted using Reynolds-Averaged Navier-Stokes (RANS) equations with a moving adaptive mesh.The effect of swimming speed,flapping amplitude,frequency and flexure amplitude on the propulsion performance of the rigid and flexible tuna-tails are investigated.Computational results reveal that a pair of leading edge vortices develop along the tail surface as it undergoes an oscillating motion.The propulsive efficiency has a strong correlation with various locomotive parameters.Peak propulsive efficiency can be obtained by adjusting these parameters.Particularly,when input power coefficient is less than 2.8,the rigid tail generates larger thrust force and higher propulsive efficiency than flexible tail.However,when input power coefficient is larger than 2.8,flexible tail is superior to rigid tail.

  3. Bycatch in the purse seine tuna fisheries in the western Indian Ocean.

    OpenAIRE

    Romanov, E. V.

    1998-01-01

    The yield of associated and dependent species taken as bycatch by the purse seine tuna fishery from the Indian Ocean pelagic ecosystem is estimated from data collected by scientific observers aboard Soviet purse seiners in the Western Indian Ocean (WIO), 1986-1992. A total of 494 sets on free swimming schools, whale shark associated schools, whale associated schools, and log associated schools were analyzed. More than 40 fish species and other marine animals were registered. Among them onl...

  4. 南海产3种金枪鱼普通肉、暗色肉营养成分分析与评价%Analysis and Evaluation of Nutritional Components in Ordinary Muscle and Dark Muscle of Three Species of Tuna from South China Sea

    Institute of Scientific and Technical Information of China (English)

    苏阳; 章超桦; 曹文红; 郑惠娜; 郝记明; 刘艳春

    2015-01-01

    比较了南海产青干金枪鱼(Thunnus tonggol)、圆鮀鲣(Auxis tapeinosoma)和鲣(Katsuwonus pelamis)的普通肉、暗色肉营养成分。结果表明,南海产青干金枪鱼、圆鮀鲣、鲣的普通肉粗蛋白(干基)质量分数依次为85.29%、87.72%、84.11%,暗色肉蛋白质质量分数分别为75.34%、81.07%、75.35%。青干金枪鱼普通肉和暗色肉的粗脂肪(干基)质量分数为6.50%和9.38%,圆鮀鲣为2.00%和7.38%,鲣为4.94%和10.26%。暗色肉蛋白质质量分数分别为20.62%、22.03%、21.86%。青干金枪鱼、圆鮀鲣及鲣普通肉和暗色肉的第一限制性氨基酸均为缬氨酸,必需氨基酸评分(AAS)分别为94和82,96和89,90和89;普通肉的蛋白质含量、必需氨基酸含量及 AAS 均高于暗色肉,说明普通肉的蛋白营养价值高于暗色肉。3种金枪鱼的普通肉、暗色肉中均含有许多不饱和脂肪酸,占总脂肪的37%~58%。DHA + EPA含量占总脂肪的17%~28%,且暗色肉中含量高于普通肉。3种金枪鱼的普通肉和暗色肉中均含有丰富的Ca、Fe、Zn等矿物元素。总体评价,南海3种金枪鱼普通肉、暗色肉均营养价值丰富。%The nutritional contents in ordinary muscle and dark muscle ofAuxis tapeinosoma, Katsuwonus pelamis,Thunnus tonggol were analyzed and evaluated. The results showed that the crude protein of ordinary muscle from Auxis tapeinosoma,Katsuwonuspelamis,Thunnustonggol in dry weight were 85.29%, 87.72% and 84.11%, higher than 75.34%, 81.07%, 75.35% of dark muscle, respectively. The crude fat content in dry weight were 6.5%, 2%, 4.94%, lower than 9.38%, 7.38%, 10.26% of dark muscle, respectively. All the first limited amino acid of three tuna was valine. The amino acid score (AAS) of ordinary muscle were 94, 96 and 90, and the AAS of dark muscle were 82, 89, 89, respectively, The higher protein content, essential amino acids content, and amino acid score (AAS) were found in

  5. Economic Impacts of Climate Change on Tuna Fisheries in Fiji Islands and Kiribati

    Energy Technology Data Exchange (ETDEWEB)

    Aaheim, Asbjoern; Sygna, Linda

    2000-06-01

    This paper discusses the possible economic consequences of a change in the tuna fisheries in the Pacific Ocean resulting from climate change. On the background of Lehodey's (2000) study of potential changes in the tuna fisheries, we survey possible economic impacts in terms of quantities and values and give examples of macroeconomic impacts. The two main effects of climate change on tuna fishing are likely to be a decline in the total stock and a migration of the stock westwards. This will lead to various changes in the catch in different countries. The price of the fish in the export market may also change as a result. The Pacific islands are generally dependent on fisheries, and may therefore be vulnerable to these changes, although some will probably gain while others will lose. Based on a very simple macroeconomic model, it is shown that the resulting effects for the national economy in general may diverge substantially from the expected. This applies, in particular, if the national economies are inflexible and a large part of the population relies on subsistence production, which is the case for many developing countries. (author)

  6. The Handling System of Product and Existence of Waste Components in Fishing Operation of Tuna in Bitung, North Sulawesi

    Directory of Open Access Journals (Sweden)

    Mustaruddin

    2016-04-01

    Full Text Available Handling in fishing vessel is urgent to maintaining the quality of tuna products, while the existence of waste components can bother the performance of fishing operations. The aims of this research are to evaluate the handling system of tuna products in fishing vessel and to analyze the influences of fishing operation to the existence of waste components. This research methods are no control chart and regression model approach. Research result shows that the handling system in the fishing operation of tuna in Bitung is not optimum. But the quality of tuna products which landed is still in controlled as shown by amount of rejecting products in UCL-LCL range (0 – 3,63 reject products/processing. The influence of amount of tuna caught per setting (X to existence of bait waste (Y formulated with model Y = - 1,176X+37.794, the influence of amount of tuna products (X to the existence of ices remained Y formulated with model Y = - 0,002X + 62,226, and also the influences of fishing operation which deputized by the amount of ABK (X1 and number of operating days (X2 to the existence of freshwater remained (Y formulated with model Y = 50,000X1-23,704X2+288,889. The significant impacts are only the influence of amount of tuna products in existence of ices remained (sigh = 0,036 and number of operating days of the existence of freshwater remained (sigh = 0,037.

  7. Utilization of tuna roe and using inulin as oil replacer for producing value added omega-3 mayonnaise product

    Directory of Open Access Journals (Sweden)

    Kanrawee Hunsakul

    2016-03-01

    Full Text Available Background: The fishery industry has been important for Thailand’s economy for more than 30 years. For example, Thailand isthe world’s largest canned tuna producer and exporter. However, onlyordinary meat or white meatis usedfor raw materialin canned tuna products. Whileroe, viscera, head and dark meataresold at cheap prices,with theseby-products being usedto feed plant or local human food,its nutritive values withfat,protein and minerals arestill high. It is well known that tuna is a good source of polyunsaturated fatty acid (PUFA, including Eicosapentaenoicacid (EPA and Docosahexanoic acid (DHA.People around the world pay more attention to eatingsaladsconsisting of fruits and vegetables, in addition todressing. Generally, mayonnaise, a kind of salad dressing, consists of chicken egg yolk(12-15% and soybean oil (30-65%. Both of these ingredients contain very high saturated fatty acid contents. Therefore, because normal mayonnaise is high in fat content and low in polyunsaturated fatty acid, this product is not ideal for people on a diet or those who are trying to control their weight. Objective: To increase omega-3 through tuna roe substitution and to replace fat content using inulin gel. Methods: Tuna roe was prepared by soaking in galangalsolutionextracted with 95% ethanol for removal fishy/rancidity odor. Inulin powder 45 g was suspended in 55 ml of water before being brought to heat at temperature 80oC for 30min to form a gel and stored at 4oC. Treatment ofmakingomega-3 mayonnaise product was started using 100% tuna roe substitution for egg yolk. Thereafter, inulin gel was added to replace vegetable oil at 0, 25, 50, 75 and 100%. Basic mayonnaise containing egg yolk and 0% inulin gel (100% soy bean oil was used asthecontrol sample. Color and emulsion stability testswere monitored for physical quality. pH value, peroxide value (PV and thiobarbituric acid reactive substances (TBARS were used for chemical qualityanalyses. Total viable

  8. The efficacy of X-ray does on murine norovirus-1 (MNV-1) in pure culture, half-shell oyster, salmon sushi, and tuna salad

    Science.gov (United States)

    In this investigation, we determined the efficacy of X-ray doses on reducing a human norovirus (HuNoV) surrogate [murine norovirus-1 (MNV-1)] in pure culture, half-shell oyster, salmon sushi and tuna salad. The pure culture (phosphate-buffer saline, pH 7.4), half-shell oyster, salmon sushi and tuna ...

  9. 热带印度洋大眼金枪鱼渔场时空分布与温跃层关系%Relationship between the temporal-spatial distribution of fish in bigeye tuna fishing grounds and the thermocline characteristics in the tropical Indian Ocean

    Institute of Scientific and Technical Information of China (English)

    杨胜龙; 张禹; 樊伟; 戴阳

    2012-01-01

    为了解印度洋大眼金枪鱼(Thunnus obesus)温跃层参数适宜分布区间及季节变化,采用Argo浮标剖面温度数据重构热带印度洋各月平均温跃层特征参数,并结合印度洋金枪鱼委员会(IOTC)大眼金枪鱼延绳钓渔业数据,本文绘制r月平均温跃层特征参数和月平均CPUE的空间叠加图,用于分析热带印度洋大眼金枪鱼渔场CPUE时空分布和温跃层特征参数的关系.结果表明,热带印度洋温跃层上界深度、温度和下界深度都具有明显的季节性变化,大眼金枪鱼中心渔场分布和温跃层季节性变化有关.夏季季风期间,高CPUE渔区温跃层上界深度在30~50 m,浅于冬季的50~70 m;温跃层上界温度范围为24~30℃.在冬季季风期间,高CPUE区域对应的温跃层上界温度范围为27~30℃;从马达加斯加岛北部沿非洲大陆至索马里附近海域,温跃层下界深度在170~200 m时的渔区CPUE普遍较高;当深度超过300 m时,CPUE值均非常低.采用频次分析和经验累积分布函数计算其最适温跃层特征参数分布,得出大眼金枪鱼最适温跃层的上界、下界温度范围分别是26~29℃和13~15℃;其上界、下界深度范围分别是30~60 m和140~170m.文章初步得出印度洋大眼金枪鱼中心渔场温跃层各特征参数的适宜分布区间及季节变化特征,为金枪鱼实际生产作业和资源管理提供理论参考.%This study plotted spatial overlay maps to analyze the relationship between bigeye tuna (Thunnus obesus) distribution in fishing grounds in the tropical Indian Ocean and thermocline characteristics, calculated from monthly temperature profile data from Argo buoys and the monthly CPUE (catch per unit effort) from bigeye tuna longlines. Seasonal variability was observed in the depth of the upper boundary temperature and in the lower boundary depth. Our analysis suggested that the distribution of bigeye tuna was related to these seasonal variations

  10. ANALISA MASA SIMPAN RENDANG IKAN TUNA DALAM KEMASAN VAKUM SELAMA PENYIMPANAN PADA SUHU RUANG DAN DINGIN Analysis of The Shelf Life of Tuna Fish as Rendang With Vacuum Packaging at Room Temperature Storage and Cold Temperatures

    OpenAIRE

    RAHMADANA.S

    2013-01-01

    2013 The objective of this research was to determine how many days the self life of rendang tuna which is packed normall and by using vacuum method at room temperature and cold storage and to determine the quality of rendang tuna which was packed normall and by using vacuum method at room temperature and cold storage. The treatment used in this study was A1B1(normall packaging stored at room temperature), A1B2 (normally packaging stored at cold temperature), A2B1 (vacuum packaging stored a...

  11. Simulation of large-scale tropical tuna movements in relation with daily remote sensing data: the artificial life approach.

    Science.gov (United States)

    Dagorn, L; Petit, M; Stretta, J M

    1997-01-01

    Tunas are known to be able to travel long distances. The aim of this paper is to propose new ethological models which reproduce some tuna movements using the dynamics of their environment. We use sea surface temperature animations (from remote sensing data) to model the South West Indian Ocean, and French purse seiners data are used to estimate movements of fish. The objective of the models will be to find a northern movement from the Mozambique Channel to the Seychelles Islands at the appropriate time (May-July). The initial model uses our ecological knowledge of tunas, i.e. the search behavior for high concentrations of food commonly associated with thermal fronts. In some cases, this simple model creates some northern movements from the Mozambique Channel, but it cannot be used to reproduce large-scale movements between the Mozambique Channel and the Seychelles Islands. The next generation model is created where tuna behaviors are modeled by an artificial neural network, using a genetic algorithm to adjust the connection weights. The tuna school-network receives daily information from its local environment and chooses the best actions in order to be able to pass from the Mozambique Channel to the Seychelles Islands at the appropriate time. One neural network emerges and represents an adaptive behavior able to interpret daily sea surface temperatures to mimic large-scale tuna movements. This artificial behavior can be generalized to each possible departure position from the Mozambique Channel. This modelling represents a new tool to study large-scale movements of pelagic fish, and is a first step towards real-time management of fisheries.

  12. Environmental conditions influencing the larval fish assemblage during summer in the Gulf of Gabes (Tunisia: South central Mediterranean

    Directory of Open Access Journals (Sweden)

    W. K. KOCHED

    2015-11-01

    Full Text Available An oceanographic survey was carried out during the summer of 2009, from June 25 to July 3 in the Gulf of Gabes. The study area is characterized by a wide continental shelf.A plankton sampling scheme was carried out to study the structure of the larval fish assemblages that characterizes the surface mixed layer, and to assess the influence of the environmental parameters on their spatial distribution.A total of 36 taxa were identified, 3 classified to the level of genus, 5 to family and 28 to species. The majority of identified fish larvae belonged to demersal species, mainly picarel Spicara smaris (23.76% of the total larval fish abundance, followed by red mullet Mullus barbatus (14.92% and several species of the Sparidae family (9.15%. Small pelagic species as Sardinella Sardinella aurita and European anchovy Engraulis encrasicolus were also abundant (27.75 % and dominated the fish larvae community in offshore stations. Five large pelagic species were found among the larvae, including bullet tuna Auxis rochei, Atlantic black skipjack Euthynnus alletteratus, albacore Thunnus alalunga, swordfish Xiphias gladius and the highly migratory Atlantic bluefin tuna Thunnus thynnus. All these apex predator species appear in 38.5% of the sampling stations and contribute about 7.9% of the total larval catches. The larval fish assemblage of the Gulf of Gabes is predominantly composed of neritic species in correspondence with the shallow depths of the study area. Canonical Correspondence Analysis (CCA showed that larval distributions were mainly conditioned by depth. However, other factors, like hydrographic processes, play also a very important role in shaping the spatial pattern of larval fish distribution.

  13. CONTENIDO DE PIGMENTOS, OTROS COMPUESTOS Y CAPACIDAD ANTIOXIDANTE EN 12 CULTIVARES DE TUNA (Opuntia spp.) DE MÉXICO

    OpenAIRE

    Inés Figueroa-Cares; María T. Martínez-Damián; Enrique Rodríguez-Pérez; María T. Colinas-León; Salvador Valle-Guadarrama; Sweetia Ramírez-Ramírez; Clemente Gallegos-Vázquez

    2010-01-01

    La tuna (Opuntia spp.) es un recurso fitogenético de México de alto valor nutritivo cuyos cultivares nativos no habían sido caracterizados. El objetivo de este trabajo fue estudiar el contenido de algunos compuestos químicos y el potencial antioxidante en 12 cultivares de tuna: Cristalina, Mansa y Vaquera (O. albicarpa), Amarilla Diamante (O. ficus-indica) y Mango (O. albicarpa), Amarilla Montesa y Pico Chulo (O. megacantha), Pabellón (O. ficus-indica), Rosa de Castilla y Torreoja (O. megacan...

  14. Some epidemiological and clinical characteristics of solid malignant tumors in children from Las Tunas

    Directory of Open Access Journals (Sweden)

    Silvio Laffita Estévez

    2015-11-01

    Full Text Available Background: cancer has kept up as the second cause of death in Las Tunas pediatric population.Objective: to characterize clinical and epidemiological variables of the cases diagnosed with solid malignant tumors in children seen and treated in the onco-pediatric consultation of “Mártires de Las Tunas” Pediatric Hospital from 2010 to 2014.Methods: a descriptive and retrospective study was carried out in 62 patients with solid malignant tumors in the pediatric population of Las Tunas province, from January, 2010 to December, 2014. The variables considered were: presumptive diagnosis, age, family history of tumors, clinical signs of alarm related to the tumor at the moment of diagnosis and investigations to confirm the diagnosis.  Results: non-Hodgkin lymphoma was the most frequently diagnosed tumor, with a 19, 35% of the patients. The most affected age group was between 11 and 14 years old, with a 33, 87%. The 16, 13% of the patients had family history of solid malignant tumors. The most frequent form of presentation was the abdominal tumor, with 29, 03 %. Abdominal ultrasound and computerized axial tomography were the most used complementary diagnostic means, both in the 17, 74% of the patients. Biopsy was used to confirm the 96, 77% of the cases.Conclusions: the clinical and epidemiological variables were characterized in pediatric patients diagnosed with solid malignant tumors in Las Tunas. Children between 11 and 14 years old and family history of malignant tumors were the most significant findings.

  15. Comportamiento de la lepra en la provincia de Las Tunas, 2003-2012

    OpenAIRE

    2014-01-01

    Se realizó un estudio descriptivo de corte transversal, para determinar algunas características epidemiológicas de la incidencia de la lepra, que es una enfermedad transmisible, tan antigua como el hombre mismo. El universo estuvo constituido por los 103 casos notificados con lepra en la provincia de Las Tunas, en el período de enero de 2003 a diciembre de 2012. La información se obtuvo por las encuestas epidemiológicas existentes en el Departamento de Estadística de la Dirección Provincial d...

  16. OPTIMASI JUMLAH RUMPON, UNIT ARMADA DAN MUSIM PENANGKAPAN PERIKANAN TUNA DI PERAIRAN PRIGI, JAWA TIMUR

    Directory of Open Access Journals (Sweden)

    Erfind Nurdin

    2016-05-01

    Full Text Available Sebagai alat bantu penangkapan ikan, rumpon berfungsi untuk menarik kelompok ikan agar berkumpul di sekitarnya. Dalam jangka pendek rumpon dapat meningkatkan produksi hasil tangkapan, efisiensi dan efektivitas operasi penangkapan ikan. Namun rumpon juga dapat berdampak negatif terhadap keberlajutan stok sumberdaya. Penelitian ini dilakukan di PPN Prigi, Jawa Timur, dengan tujuan untuk mengkaji status pemanfaatan perikanan tuna, optimasi jumlah unit armada dan rumpon serta musim penangkapan ikan.  Beberapa analisis yang digunakan antara lain linear goal programming (LGP, fishing power indeks (FPI, catch per unit of effort (CPUE, maximum sustainable yield (MSY, dan untuk mengetahui pola musim tangkap menggunakan Metode Persentase Rata-rata. Hasil penelitian menunjukkan terdapat indikasi pemanfaatan perikanan tuna yang berlebih pada tingkat pengupayaan yang melampaui batas maksimum (MSY = 2334,9 ton/tahun.  Jumlah optimum untuk armada jaring insang sebanyak 43 unit, pancing tonda 63 unit dan rumpon 33 unit pada luasan area penelitian 8.940 km². Musim tangkap berlangsung pada Bulan Juni sampai Desember dengan puncak musim di bulan Juli.    Fish Aggregating Device (FADs has a function to attract and aggregate fish schooling. In short term, the advantage of FADs used is to increase the efficiency and effectiveness of fishing operations and the fish caught by the fishers; however FADs might also result a negative impact on the sustainability of fish stock.This study was conducted in fishing area of Prigi National Fishing Port, East Java. The objective of this study is to investigate the tuna fisheries status, optimization number of fishing units and number of FADs. Some analysis methods applied in this study were linear goal programming (LGP, fishing power index (FPI, catch per unit of effort (CPUE, maximum sustainable yield (MSY, and analysis of fishing season using the Average Percentage Methods. The results showed that the tuna fisheries in

  17. Anaerobic co-digestion of animal waste: swine manure and tuna fish waste

    Energy Technology Data Exchange (ETDEWEB)

    Otero, L.; Alvarez, J. A.; Lema, J. M.

    2009-07-01

    Anaerobic digestion has become an established and proven technology for the treatment of solid wastes. Co-digestion offers several possible ecological, technology and economical advantages. Anaerobic co-digestion can increase CH{sub 4} production of manure diesters in a 50-200% according to the operation conditions and the co-substrates used. Last September 2007, PROBIOGAS project started up with the objective of improving the production and use of biogas from co-digestion of farming, agricultural and industrial waste. Our research group takes part in the study of co-digestion of swine manure firstly with tuna fish waste and secondly with glycerine (bio diesel production waste). (Author)

  18. The Kinematics and Dynamics of Undulatory Motion of a Tuna-mimetic Robot

    OpenAIRE

    Sayyed Farideddin Masoomi; Stefanie Gutschmidt; XiaoQi Chen; Mathieu Sellier

    2015-01-01

    This paper presents the steps for the mathematical modelling of a fish robot with four degrees of freedom (DOF) called UC-Ika 1. The swimming motion of the robot, which is inspired by tuna fish, needs to generate an undulatory motion by its tail peduncle and caudal fin. Hence, the robot has the benefit of a tail mechanism that plays a determining role in the dynamic behaviour of the robot. Analysing this tail mechanism and the hydrodynamic forces acting upon the fish robot, the governing equa...

  19. From forager tracks to prey distributions: an application to tuna vessel monitoring systems (VMS).

    Science.gov (United States)

    Walker, Emily; Rivoirard, Jacques; Gaspar, Philippe; Bez, Nicolas

    2015-04-01

    In the open ocean, movements of migratory fish populations are typically surveyed using tagging methods that are subject to low sample sizes for archive tags, except for a few notable examples, and poor temporal resolution for conventional tags. Alternatively, one can infer patterns of movement of migratory fish by tracking movements of their predators, i.e., fishing vessels, whose navigational systems (e.g., GPS) provide accurate and frequent VMS (vessel monitoring system) records of movement in pursuit of prey. In this paper, we develop a state-space model that infers the foraging activities of fishing vessels from their tracks. Second, we link foraging activities to probabilities of tuna presence. Finally, using multivariate geostatistical interpolation (cokriging) we map the probability of tuna presence together with their estimation variances and produce a time series of indices of abundance. While the segmentation of the trajectories is validated by observers' data, the present VMS-index is compared to catch rate and proved to be useful for management perspectives. The approach reported in this manuscript extends beyond the case study considered. It can be applied to any foragers that engage in an attempt of capture when they see prey and for whom this attempt is linked to a tractable change in behavior.

  20. Lead, cadmium, arsenic and mercury in canned tuna fish marketed in Tehran, Iran.

    Science.gov (United States)

    Andayesh, Shirin; Hadiani, Mohammad Rasoul; Mousavi, Zahra; Shoeibi, Shahram

    2015-01-01

    Fifty-four canned tuna fish samples corresponding to 10 widely used different brands were purchased from local markets in Tehran, Iran during 2012-2013 and analysed on heavy metals. Mercury was determined by a direct mercury analyser without any sample preparation. For analysis of other elements samples were digested using a microwave apparatus. Lead and cadmium were determined by graphite furnace atomic absorption spectrometry and arsenic via hydride vapour generation. All samples had arsenic and mercury contamination. Arsenic levels showed a range of 0.25-1.42 mg kg(-1), which might be due to lack of national and international limits for arsenic in canned tuna fish. Lead and cadmium were measured in a small number of samples with a mean of 0.053 ± 0.058 mg kg(-1) and 0.013 ± 0.015 mg kg(-1), respectively. Results obtained for these heavy metals in all samples were lower than the corresponding limits, whereas arsenic and mercury contents might raise some attention.

  1. Optimisation of the microencapsulation of tuna oil in gelatin-sodium hexametaphosphate using complex coacervation.

    Science.gov (United States)

    Wang, Bo; Adhikari, Benu; Barrow, Colin J

    2014-09-01

    The microencapsulation of tuna oil in gelatin-sodium hexametaphosphate (SHMP) using complex coacervation was optimised for the stabilisation of omega-3 oils, for use as a functional food ingredient. Firstly, oil stability was optimised by comparing the accelerated stability of tuna oil in the presence of various commercial antioxidants, using a Rancimat™. Then zeta-potential (mV), turbidity and coacervate yield (%) were measured and optimised for complex coacervation. The highest yield of complex coacervate was obtained at pH 4.7 and at a gelatin to SHMP ratio of 15:1. Multi-core microcapsules were formed when the mixed microencapsulation system was cooled to 5 °C at a rate of 12 °C/h. Crosslinking with transglutaminase followed by freeze drying resulted in a dried powder with an encapsulation efficiency of 99.82% and a payload of 52.56%. Some 98.56% of the oil was successfully microencapsulated and accelerated stability using a Rancimat™ showed stability more than double that of non-encapsulated oil.

  2. IMPACT OF CLIMATE ANOMALY ON CATCH COMPOSITION OF NERITIC TUNA IN SUNDA STRAIT

    Directory of Open Access Journals (Sweden)

    Khairul Amri

    2013-12-01

    Full Text Available Tongkol komo/kawakawa (Euthynnus affinis and tenggiri (Scomberomerus guttatus are commonly caught by mini purseiners operated in Sunda Straits and landed in Labuan, West Java. This species inhabits coastal water and has preference staying in relatively warm water. Oceanography parameters commonly influencing the distribution of Euthynnus affinis are temperature, current, and salinity. The oceanography of Sunda Strait is influenced by water masses coming from the north that mainly originated from the Java Sea and water masses from the south mainly originated from Indian Ocean. The internal oceanography of Sunda Strait is also influenced by upwelling and monsoon as regional climate anomaly (ENSO and Indian Ocean Dipole Mode. This paper describes the influence of Dipole Mode (positive and negative event and ENSO (El- Nino/La-Nina to the catch dynamics of neritic tuna particularly in Sunda Straits waters. The results shown that regional climate anomaly influenced neritic tuna catch and its composition. The catches Euthynnus affinis in phase negative dipole mode or La-Nina were higher and dominated the catch composition of pelagic fishes of Sunda Strait. Similar situation also is showen by Scomberomorus commerson.

  3. Field biology of Halimeda tuna (Bryopsidales, Chlorophyta) across a depth gradient : comparative growth, survivorship, recruitment, and reproduction

    NARCIS (Netherlands)

    Vroom, P.S.; Smith, C.M.; Coyer, J.A.; Walters, L.; Hunter, C.L.; Beach, K.S.; Smith, J.E.

    2003-01-01

    Growth, survivorship, recruitment, and reproduction of Halimeda tuna, a dominant green alga in many reef systems of the Florida Keys, were monitored at a shallow back reef ( 4 - 7m) and deep reef slope ( 15 - 22 m) on Conch Reef. Despite lower light intensities and similar grazing pressures, amphipo

  4. Strategies and tactics of tuna fishers in the payao (anchored FAD) fishery from general Santos city, Philippines

    NARCIS (Netherlands)

    Macusi, Edison; Babaran, R.P.; Zwieten, van P.A.M.

    2015-01-01

    Payaos or anchored FADs are used extensively in the Philippine tuna fishery. Currently, spatial regulations on FAD use are implemented with limited observance or understanding of their potential impacts. A combination of semi-structured interviews (n=150) and a total of six focus group discussions (

  5. Fisher-Level Decision Making to Participate in Fisheries Improvement Projects (FIPs) for Yellowfin Tuna in the Philippines

    NARCIS (Netherlands)

    Tolentino-Zondervan, F.; Berentsen, P.B.M.; Bush, S.R.; Oude Lansink, A.G.J.M.

    2016-01-01

    This study identifies the capabilities needed by small-scale fishers to participate in Fishery Improvement Projects (FIPs) for yellowfin tuna in the Philippines. The current literature provides little empirical evidence on how different models, or types of FIPs, influence the participation of fisher

  6. Certification of total arsenic, dimethylarsinic acid and arsenobetaine contents in a tuna fish powder (BCR-CRM 627)

    DEFF Research Database (Denmark)

    Lagarde, F.; Amran, M. B.; Leroy, M. J. F.

    1999-01-01

    Tuna fishes were collected in the Straits of Messina (Italy), were dissected and dorsal muscles minced, freeze-dried, ground and sieved. The obtained powder was stabilised by gamma-irradiation and filled into brown glass bottles. The homogeneity and stability at +20 degrees C and +40 degrees C we...

  7. Proteomic analysis of processing by-products from canned and fresh tuna: identification of potentially functional food proteins.

    Science.gov (United States)

    Sanmartín, Esther; Arboleya, Juan Carlos; Iloro, Ibon; Escuredo, Kepa; Elortza, Felix; Moreno, F Javier

    2012-09-15

    Proteomic approaches have been used to identify the main proteins present in processing by-products generated by the canning tuna-industry, as well as in by-products derived from filleting of skeletal red muscle of fresh tuna. Following fractionation by using an ammonium sulphate precipitation method, three proteins (tropomyosin, haemoglobin and the stress-shock protein ubiquitin) were identified in the highly heterogeneous and heat-treated material discarded by the canning-industry. Additionally, this fractionation method was successful to obtain tropomyosin of high purity from the heterogeneous starting material. By-products from skeletal red muscle of fresh tuna were efficiently fractionated to sarcoplasmic and myofibrillar fractions, prior to the identification based mainly on the combined searching of the peptide mass fingerprint (MALDI-TOF) and peptide fragment fingerprinting (MALDI LIFT-TOF/TOF) spectra of fifteen bands separated by 1D SDS-PAGE. Thus, the sarcoplasmic fraction contained myoglobin and several enzymes that are essential for efficient energy production, whereas the myofibrillar fraction had important contractile proteins, such as actin, tropomyosin, myosin or an isoform of the enzyme creatine kinase. Application of proteomic technologies has revealed new knowledge on the composition of important by-products from tuna species, enabling a better evaluation of their potential applications.

  8. Trophic niches of sympatric tropical tuna in the Western Indian Ocean inferred by stable isotopes and neutral fatty acids

    Science.gov (United States)

    Sardenne, Fany; Bodin, Nathalie; Chassot, Emmanuel; Amiel, Aurélien; Fouché, Edwin; Degroote, Maxime; Hollanda, Stéphanie; Pethybridge, Heidi; Lebreton, Benoit; Guillou, Gaël; Ménard, Frédéric

    2016-08-01

    This study examined the trophic ecology of three sympatric tropical tuna species (bigeye BET, skipjack SKJ, and yellowfin YFT) sampled in the Western Indian Ocean throughout 2013. Specifically we explored inter-specific resource partitioning and ontogenetic variability using neutral fatty acids and stable isotope analysis of liver and muscle from small (⩽100 cm fork length, FL) and large (>100 cm FL) tuna collected in mixed schools at the surface by purse-seine. Both biochemical tracers were used to calculate trophic niche indices that collectively revealed high potential for resource overlap, especially among small tuna. Resource overlap appeared strongest between BET and YFT, with SKJ tissues having high carbon isotope (δ13C) values (-17 ± 0.3‰), lower nitrogen isotope (δ15N) values (11.4 ± 0.6‰), and higher relative proportion of poly-unsaturated fatty acids (PUFA) than the two other species, indicating a different diet. Size was found to be a strong predictor for most biochemical tracers in the three species with δ13C, δ15N and total lipid content in the liver. In the larger species (YFT and BET), proportions of mono-unsaturated fatty acids typically increased with size, while quantities of PUFA decreased. In addition to ontogenetic variability, trophic markers were shown to vary between sampling area and season: higher lipid reserves and δ15N values, and lower δ13C values occurred during monsoon periods around Seychelles than in the Mozambique Channel (parted from about 1500 km). Our multi-tracer approach reveals the magnitude of potential competitive interactions in mixed tropical tuna schools at both small and large sizes and demonstrates that ontogenetic niche differentiation acts as a major factor of coexistence in tropical tuna.

  9. 50 CFR 300.185 - Documentation, reporting and recordkeeping requirements for consignment documents and re-export...

    Science.gov (United States)

    2010-10-01

    ... flag country whose vessel caught the fish (regardless of where the fish are first landed). Re-export... requiring a BCD tag on all such bluefin tuna available for sale, must be accompanied by the appropriate...

  10. A novel spectral tuning in the short wavelength-sensitive (SWS1 and SWS2) pigments of bluefin killifish (Lucania goodei)

    Science.gov (United States)

    Yokoyama, Shozo; Takenaka, Naomi; Blow, Nathan

    2007-01-01

    The molecular bases of spectral tuning in the UV-, violet-, and blue-sensitive pigments are not well understood. Using the in vitro assay, here we show that the SWS1, SWS2-A, and SWS2-B pigments of bluefin killifish (Lucania goodei) have the wavelengths of maximal absorption (λmax’s) of 354, 448, and 397 nm, respectively. The spectral difference between the SWS2-A and SWS2-B pigments is largest among those of all currently known pairs of SWS2 pigments within a species. The SWS1 pigment contains no amino acid replacement at the currently known 25 critical sites and seems to have inherited its UV-sensitivity directly from the vertebrate ancestor. Mutagenesis analyses show that the amino acid differences at sites 44, 46, 94, 97, 109, 116, 118, 265, and 292 of the SWS2-A and SWS2-B pigments explain 80% of their spectral difference. Moreover, the larger the individual effects of amino acid changes on the λmax-shift are, the larger the synergistic effects tend to be generated, revealing a novel mechanism of spectral tuning of visual pigments. PMID:17498892

  11. Genetic stock structure of frigate tuna (Auxis thazard) along Indian coast based on PCR-RFLP analyses of mtDNA D-Loop region

    Digital Repository Service at National Institute of Oceanography (India)

    GirishKumar; Kunal, S.P.; Menezes, M.R.

    , and differences between groups of populations. Estimates of expected number of female migrants between samples per generation (Nfm) was calculated using the formula 2Nfm = ((1/FST)-1) (Takahata and Palumbi, 1985). The population parameters θ and τ were also... spawning in correlation with size of females (Rao, 1964; Pillai and Gopakumar, 2003). India is fortunate to have large resources of tuna. The estimated potential of tuna in Exclusive Economic Zone (EEZ) of India is about 278,000 tonnes (Pillai...

  12. Mercury concentration change in human hair after the ingestion of canned tuna fish

    Energy Technology Data Exchange (ETDEWEB)

    Inasmasu, T.; Ogo, A.; Yanagawa, M.; Keshino, M.; Hirakoba, A.; Takahashi, K.; Ishinish, N.

    1986-10-01

    The concentration of mercury in the hair of man has been conveniently used as an indicator of environmental exposure to mercury. In particular, studies concerning the relationship between the concentration of mercury in the hair and the dietary intake of mercury have revealed that the amount of fish consumed significantly affects the mercury concentration in the scalp hair. However, the quantitative relationship between the mercury concentration in the hair and the dietary intake of mercury has been scarcely proven. This is because mercury concentration in hair sampled reflects the degree of exposure from diet in the past, and because the dietary measurements of mercury generally depend on individuals remembering accurately or having recorded their intake of fish in the past. In an attempt to elucidate this problem. The authors assessed the mercury concentration in the hair of human subjects who ingested a certain amount of canned tuna fish.

  13. Gestión de la Energía en la Universidad de Las Tunas

    Directory of Open Access Journals (Sweden)

    Anislei Santiesteban-Velázquez

    2014-01-01

    Full Text Available El trabajo presenta la actualización del sistema de gestión de energía en la Universidad de Las Tunas “Vladimir Ilich Lenin”. Se analizaron los resultados de la actualización del Sistema de Gestión Total Eficiente de Energía y las medidas tomadas para el uso eficiente de la energía eléctrica. Se determinan las principales variables universitarias influyentes en el consumo y se realizó un estudio estadístico de las mismas. Se determinaron las áreas y puestos claves que inciden en el consumo de la energía eléctrica, siendo este el portador energético más consumido.

  14. Breve historia de los servicios farmacéuticos en Las Tunas

    Directory of Open Access Journals (Sweden)

    Yoandry Martínez Guevara

    2014-08-01

    Full Text Available En el presente trabajo se realiza un acercamiento a la historia de los servicios farmacéuticos en Las Tunas, con el objetivo de analizar el surgimiento y formación de estos servicios y su relación con la sociedad. La investigación recorre casi 400 años de historia, abarcando desde los inicios del boticario y farmacéutico, el tránsito a profesión, y por último, su especialización e impacto en la sociedad tunera de los siglos XIX y XX; profundizando en el periodo de la República Neocolonial. Se aporta el número de boticas y farmacias que existieron en el territorio. La revisión realizada actualiza informaciones sobre la historia regional, a partir de la consulta de fuentes especializadas y complementa investigaciones en curso sobre este tema

  15. Discovery of the strong antioxidant selenoneine in tuna and selenium redox metabolism

    Institute of Scientific and Technical Information of China (English)

    Yumiko; Yamashita; Takeshi; Yabu; Michiaki; Yamashita

    2010-01-01

    A novel selenium-containing compound,selenoneine,has been isolated as the major form of organic selenium in the blood and tissues of tuna.Selenoneine harbors a selenium atom in the imidazole ring,2-selenylNα,Nα,Nα-trimethyl-L-histidine,and is a selenium analog of ergothioneine.This selenium compound has strong antioxidant capacity and binds to heme proteins,such as hemoglobin and myoglobin,to protect them from iron auto-oxidation,and it reacts with radicals and methylmercury(MeHg) .The organic cations/carnitine transporter OCTN1 transports selenoneine and MeHg,regulates Se-enhanced antioxidant activity,and decreases MeHg toxicity.Thus,the dietary intake of selenoneine,by consuming fish,might decrease the formation of reactive oxygen radicals that could oxidize nucleotides in DNA,and thereby inhibit carcinogenesis,chronic diseases,and aging.

  16. [Fatty acids of the tuna of different fishing areas of the Mexican Pacific, canned in oil and water].

    Science.gov (United States)

    Castro Gónzalez, M I; Montaño Benavides, S; Pérez-Gil Romo, F

    2001-12-01

    A direct relationship exists between the state of health and the diet, and inside this some components, such as the fatty acids (FA), influence mostly in the prevention of certain illnesses (coronary heart disease, hypertension, rheumatoid arthritis, inflammatory answer, and arterial pressure). One of the main sources of essential FA are the marine products; the tuna is a marine food of wide consumption in Mexico due its readiness and low cost. The objective of this work was to determine the profile of fatty acids (FA) in tuna canned in oil and in water coming from three fishing areas of the Mexican Pacific. There were randomly obtained 7 oil-tuna commercial marks (AA) and 5 water- tuna (AW) coming from the next fishery areas: Baja California Sur (L1), Colima (L2) and Mazatlán (L3). The samples without draining were liquefied and thereafter it was obtained the methyl esters of fatty acids that were analyzed by gas chromatography with a flame ionization detector. In all the areas were identified 20 FA (mg/100 g); three AG omega 3 (EPA, DHA and linolenic) and two omega 6 (linoleic and arachidonic). In the AA of the three areas the most abundant saturated FA were estearric and palmitic acids, the most abundant monounsaturated fatty acid was the cis-vaccenic, followed by the oleic acid. The behavior of those omega 3 in the AA of the three areas were similar: with the less quantity was the linolenic acid (447-755), continued by the EPA (979-1323) and finally high concentrations of DHA (1862-3327). In the AW the DHA was the most abundant fatty acid in all the areas (1086-4456), the most abundant monounsaturated fatty acid was the palmitic (640-3809). It was observed the presence of trans fatty acids in high quantities in AW: linolelaidic (1394-1495) and elaidic (377-1234). The relationship omega 3/omega 6 in the AA was similar in L1 and L2, and lower in L3; in AW was higher in L2 and L3. In conclusion, evident variation exists in the content of FA among areas; it could

  17. Cirugía refractiva en un quinquenio en Las Tunas

    Directory of Open Access Journals (Sweden)

    Vivian Céspedes Galiano

    2014-11-01

    Full Text Available La cirugía refractiva es una subespecialidad de la oftalmología, encargada de los procedimientos quirúrgicos dirigidos al tratamiento de los defectos refractivos. Se realizó un estudio descriptivo prospectivo y longitudinal, para describir los resultados de la cirugía refractiva en el Centro Oftalmológico del Hospital General Docente “Dr. Ernesto Guevara de la Serna” de la provincia de Las Tunas, desde noviembre de 2009 a noviembre de 2014. Se realizaron 744 cirugías en 409 pacientes que acudieron a consulta para ser operados por algún defecto refractivo. Un total de 110 ojos fueron intervenidos por LASIK y 619 por LASEK; predominó el sexo femenino en edades entre 20-29 años; el defecto refractivo más frecuente fue el astigmatismo miópico compuesto. Los defectos epiteliales de hipercorrección fueron la complicación con más frecia encontrada. Los resultados visuales hasta la fecha son significativos, una vez que los pacientes han logrado una agudeza visual sin corrección entre 0,8 y 1,0. El láser excimer posibilita el moldeamiento de la curvatura corneal, con vistas a lograr un resultado refractivo con mínimas alteraciones al tejido circundante; por tanto, a escala internacional, se ha convertido en la técnica quirúrgica prevaleciente para el tratamiento de las ametropías. La realización de la intervención quirúrgica refractiva en Las Tunas ha tenido resultados de impacto

  18. Incidencia prenatal de los defectos congénitos en Las Tunas

    Directory of Open Access Journals (Sweden)

    Juana Lupe Muñoz Callol

    2015-04-01

    Full Text Available Los defectos congénitos son la principal causa de morbilidad y mortalidad neonatal en casi todo el mundo. La introducción del diagnóstico prenatal y el establecimiento de estrategias preventivas en la atención primaria de salud han logrado la disminución de la prevalencia al nacimiento de defectos congénitos y de la mortalidad infantil en nuestro país. Se realizó un estudio descriptivo de corte transversal de los casos diagnosticados o confirmados prenatalmente en la consulta de genética provincial, con el objetivo de describir la incidencia prenatal de los defectos congénitos en la provincia Las Tunas, durante el período de enero 2013 a mayo 2014. De un universo de 9462 embarazadas de la provincia, en el periodo de estudio; se escogió una muestra de 110 gestantes que presentaron defectos fetales en diferentes órganos y sistemas. La información se obtuvo del registro provincial, donde se analizaron las variables: comportamiento de defectos congénitos por áreas de salud, edad de las madres por defectos congénitos, defectos congénitos por programas prenatales y los defectos congénitos por sistemas. El mayor número de casos se diagnosticó en el segundo trimestre del embarazo, siendo el sistema cardiovascular donde se encontró un número mayor de defectos congénitos, seguido del sistema digestivo, genitourinarias y del sistema nervioso central. Las edades maternas estuvieron comprendidas entre 21 y 30 años, siendo el municipio Tunas el que aportó un número significativo de afectados

  19. Incidencia de los defectos congénitos asociados al uso de medicamentos en Las Tunas

    Directory of Open Access Journals (Sweden)

    Glenys K. Silva Gonzalez

    2015-04-01

    Full Text Available La Red de Genética Nacional estableció un sistema de vigilancia pre y postnatal, para evaluar los efectos potenciales de la medicación en aquellas gestantes que ocasionalmente o de manera permanente ingieren fármacos durante el embarazo. En la provincia de Las Tunas se realizó un estudio descriptivo, prospectivo para describir la incidencia de defectos congénitos en la etapa prenatal y al nacimiento de los fetos en las mujeres que consumieron algún medicamento en el primer trimestre del embarazo, durante el período de enero de 2009 a mayo de 2014. La población de estudio lo constituyeron las 627 embarazadas, que habían consumido algún tipo de fármaco que se identificara como posible agente teratogénico y fueron remitidas al Centro de Genética Provincial para su seguimiento. Los datos obtenidos del registro de morbilidad teratogénica permitieron analizar las variables: casos reportados al registro provincial de medicamentos durante la gestación, medicamentos consumidos durante el embarazo según categoría, momento de la gestación en que se produjo el consumo del fármaco, duración del tratamiento durante el embarazo y evaluación del embarazo o el producto. El consumo de medicamentos fue más abundante en gestantes del municipio Las Tunas. Predominó el consumo de medicamentos antiinfecciosos; el consumo ocurrió con más frecuencia en el primer trimestre; y la duración más probable fue de una semana. A pesar de ello, el consumo de medicamentos durante la gestación no significó un riesgo incrementado de teratogenicidad

  20. Morphology of bigeye tuna otolith in waters near Marshall Islands%马绍尔群岛海域大眼金枪鱼耳石形态

    Institute of Scientific and Technical Information of China (English)

    宋利明; 吕凯凯; 杨嘉樑; 胡振新

    2012-01-01

    耳石是鱼类生态的重要信息载体。根据2009年11月-2010年1月马绍尔群岛海域采集的大眼金枪鱼(Thunnus obesus)样本中获得的222对矢耳石,对其形态特征进行观察和测量。观察发现,矢耳石上有3条凹沟,可将矢耳石分为背区、翼区、吻区和侧区4个区。t检验表明,左右矢耳石形态参数无显著性差异(P=0.999)。对矢耳石12个形态参数作主成分分析,结果显示,背区长(DL)、翼区前长(WFL)、翼区长(WL)和最大厚度(MST)可以代表矢耳石尺度特征,背区夹角(DA)和翼区夹角(WA)代表矢耳石角度特征。DL与MST的关系可用指数表达,叉长(FL)与DL间可用多项式表达、叉长与WFL和矢耳石重量(OW)间可用逻辑斯蒂克模型表达。随叉长增加,矢耳石核心向背区、侧区和吻区方向移动。对不同DL组的DA进行多重比较分析,发现DA在DL为500~700μm间出现生长波动,结合FL与DL之间关系,认为大眼金枪鱼初次性成熟时DL为600μm左右,叉长在80~130 cm之间。%The otolith of fish is an important source of ecological information.It is a popular and successful tool in discriminating between and within fish stocks to study the morphologic characteristics of the otolith.A total of 222 pairs of sagittal otolith were collected randomly from Nov.2009 through Jan.2010 in waters near Marshall Islands.The morphologic characteristics of them were observed and measured.There were three channels on them which divide the sagittal otolith four areas(dorsum,wing,rostrum,and lateral).There was no significant difference between the morphological parameters of the left sagitta and the right sagitta(P=0.999).The result of principal component analysis on 12 morphologic parameters showed the dorsal length(DL),wing front length(WFL),wing length(WL) and maximum statolith thickness(MST) can be used to represent the size features of the sagittal otolith;the dorsal angle

  1. 金枪鱼延绳钓不同位置钓钩渔获效率的研究%Study on the Catching Efficiency of Hooks of Tuna Long-Line Fishing Gear

    Institute of Scientific and Technical Information of China (English)

    叶振江; 梁振林; 邢智良; 高志军

    2001-01-01

    本文从金枪鱼延绳钓渔具的结构及渔获效果入手,分析了大眼金枪鱼(Thunnus obesus)和黄鳍金枪鱼(Thunnus albacares)的垂直分布及该延绳钓渔具不同位置钓钩的渔获效率,据以对钓具的性能做出初步评价,并提出了改进的建议.

  2. Use of tuna industry waste in diets for Nile tilapia, Oreochromis niloticus, fingerlings: effect on digestibility and growth performance

    Directory of Open Access Journals (Sweden)

    Crisantema Hernández

    2013-07-01

    Full Text Available During the tuna canning process, about 52~54% of the total weight of the fish is discarded as waste, which can be processed in order to obtain tuna byproducts meal (TBM, or stabilized as tuna silage hydrolysates (TSH. Both products were tested as replacements of soybean meal (SBM, in diets for fingerling male Nile tilapia Oreochromis niloticus. Seven test diets were isonitrogenous (35% CP and isoenergetic (19 kJ g-1: a basal diet contained SBM as main protein source (TSH0; four experimental diets had increasing inclusion levels of TSH replacing 25, 50, 75 and 100% of the SBM protein. The sixth diet contained TBM as sole protein source, and a commercial feed for tilapia was used as reference diet (RD. The diets were fed for eight weeks to triplicate tanks, each with 15 fry tilapia (initial weight of 0.89 ± 0.29 g. Tilapia fed the TBM diet had greater weight gain and feed intake, and lower feed conversion ratios than those fed diets containing with TSH. The RD, TSH25 and TSH50 diets gave the similar growth response. Fish fed diets TSH0, TSH75% and TSH100% showed reduced growth performance.

  3. Feeding tuna oil to the sow at different times during pregnancy has different effects on piglet long-chain polyunsaturated fatty acid composition at birth and subsequent growth.

    Science.gov (United States)

    Rooke, J A; Sinclair, A G; Edwards, S A

    2001-07-01

    In an attempt to prevent decreases in piglet 20 : 4n-6 status at birth while increasing 22 : 6n-3 status, multiparous sows (eight per treatment) were allocated to one of three different treatments: a basal diet fed from day 63 of pregnancy to term; basal diet supplemented with tuna oil (17.5 g/kg) from day 63 to day 91 and then basal diet alone from day 92 to term; basal diet alone from day 63 to day 91 and then basal diet supplemented with tuna oil from day 92 to term. Tuna oil supplementation increased mainly 22 : 6n-3 intake. Supplementation with tuna oil between day 92 and term increased 22 : 6n-3 to a greater extent in all piglet tissues (brain, liver, retina and the remaining carcass) at birth than supplementation with tuna oil between days 63 and 91. However, while piglet 20 : 4n-6 decreased to a greater extent in liver and carcass when diets were supplemented with tuna oil between days 92 and term than between days 63 and 91, in the brain and retina, the reverse was true; 20 : 4n-6 was decreased to a greater extent between days 63 and 91 than between 92 and term. The effect of pregnancy nutrition on the growth of piglets until 7 d postweaning (35 d of age) was assessed after removing any residual effects of pregnancy treatment by cross-fostering some piglets at birth. Piglets, the diets of whose dams had been supplemented with tuna oil during pregnancy, grew faster during the first 35 d of life than the progeny of sows fed only the basal diet. Feeding tuna oil to sows at different times during pregnancy therefore did not prevent decreases in piglet 20 : 4n-6 status at birth, but did suggest that changes in piglet brain 20 : 4n-6 status between days 63 and 91 of pregnancy were not reversible by later nutrition. Supplementing the diet of the pregnant sow with tuna oil had beneficial effects on postnatal piglet growth.

  4. THE SEASONAL VARIABILITY OF CPUE AND CATCH-AT-SIZE DISTRIBUTION OF TROLL AND HANDLINE TUNA FISHERIES LANDED IN LABUHAN LOMBOK

    Directory of Open Access Journals (Sweden)

    Bram Setyadji

    2016-12-01

    Full Text Available Troll and hand line tuna fisheries is one of the major fishing gears landed in Labuhan Lombok coastal fishing port (PPP Labuhan Lombok west Nusa Tenggara Barat province.  Both fisheries are strongly associated with fish aggregating devices (FAD’s. The main fishing ground is Indian Ocean southern part of this province.  Several source of data has been collected regularly. Data analysis comprised of monthlycatch and effort data samples based onport monitoring program during 2012 to 2015. The result showed the diclining of CPUE of yellow fin and skipjack tuna presumably related to fishing intensity of fleets and its variability that landed in PPP Labuhan Lombok.  The increasing CPUE of skipjack tuna in 2014 was predicted due to increasing aggregation around the FADs. Constrasting seasonal fishing index pattern between yellowfin and skipjack tuna foundin 4-month cycles, started in January.A length-weight relationship suggested that yellowfin tuna caught bysmall-scale fisheries were performing allometric growth pattern (b=2.963, r2=0.9737.

  5. Biological characteristics of Thunnus obesus in longlining ground of the Central Atlantic Ocean%大西洋中部金枪鱼延绳钓渔场大眼金枪鱼的生物学特性

    Institute of Scientific and Technical Information of China (English)

    宋利明; 陈新军; 许柳雄

    2004-01-01

    Based on the biological data of bigeye tuna measured from the longlining ground of the Central Atlantic Ocean from Jun. 2001 to Oct. 2001, this paper analyzed the bigeye tuna's maturity stages of the gonad, feeding intensity, species composition of prey, sex ratio, fork length distribution, relationships between fork length and dressed weight, fork length and round weight, round weight and dressed weight by statistic and regression methods. The results indicate: ( 1 ) Maturity at Ⅳ-Ⅵ of the gonad are dominant with the highest percentage of Ⅴ (30.11% ). (2)The feeding intensity is mainly in the class 1 ,class 2 or class 3,totally 83.16%. (3)In the bigeye tuna's species composition of prey, the percentage of miscellaneous fish or cephalopod is relatively high, 38.05 % or 30.48 % respectively. Catch rate of bigeye tuna can be enhanced when cephalopod is used as the bait. (4) The male-female ratio is 2 : 1. This pattern might result from elevated mortality of adult females. (5) The fork length distribution is suitable for the normal. The dominant fork length is 1.13 - 1.49m, 64.16%, with the mean value of 1.32m. (6)The relationship between fork length and dressed weight. (7)The relationship between fork length and round weight. If the fork length is the same, the round weight converted in this paper's formula is a little lighter than the round weight converted in Parks's formula concluded at 1981 of the longline bigeye tuna catch. It might be caused by the different sampling areas or sampling time. (8)The relationship between round weight and dressed weight. The round weight conversion factor in this paper is a little higher than the ICCAT. It might be caused by the different processing methods. ICCAT is recommended to adapt this paper's conversion factor.

  6. Arte, cultura y lucha contra el cáncer en Las Tunas

    Directory of Open Access Journals (Sweden)

    Juan Ernesto Pérez Reyes

    2014-08-01

    Full Text Available Los avances científicos de hoy están permitiendo que el cáncer no se convierta en una sentencia inexorable de muerte. La cronificación del tratamiento plantea retos a los sistemas sanitarios, en su compromiso por ofrecer al enfermo el apoyo para enfrentar su nueva situación y devolverlo a la vida normal. Las complicaciones producto de los tratamientos, los efectos físicos secundarios, la modificación de las rutinas y el sentir que se vive bajo una amenaza, desestabilizan el balance emocional de muchos enfermos. El arte puede captar los más personales aspectos en la experiencia del cáncer. La creación artística puede unir a pacientes, familiares, amigos, al equipo sanitario y a la comunidad en su conjunto, aportando nuevos caminos para ayudar al paciente. La labor artística puede proveer de otros modos de expresión que no se encuentran en las formas tradicionales de tratamiento, permitiendo explorar temas intrínsecos del enfermo de forma creativa y personal. El arte puede comunicar con los aspectos más silenciados de la enfermedad, ayudando a las personas con escasas posibilidades para confesar sus experiencias. Bajo esta premisa el recientemente fundado capítulo provincial de la Sociedad cubana de oncología, radioterapia y medicina nuclear ha efectuado en Las Tunas varias actividades a partir del día tres de febrero del actual año, comenzando con la inauguración de la Jornada provincial de lucha contra el cáncer. La estrategia divulgativa contó con la colaboración del Grupo provincial para el control del cáncer, el Centro provincial del cine y el proyecto FILOARTMED de la Universidad médica de Las Tunas, quienes se han interesado en elevar la producción científica de los profesionales de la salud, que luchan por controlar el cáncer en el territorio. En la sala cinematográfica Titón del Teatro Tunas, se dieron cita los miembros del capítulo provincial de la Sociedad cubana de oncología, radioterapia y medicina

  7. Estimate of exploitation rates and population size of skipjack tuna off the southeastern coast of Brazil

    Directory of Open Access Journals (Sweden)

    Silvio Jablonski

    1985-01-01

    Full Text Available Size compositions and total landings of skipjack tuna caught in the southeastern Brazilian waters by bait-boats are used as the basis of the assessment of the population for 1980-1983 period, employing the length cohort analysis and virtual population analysis. From monthly size frequency data it is suggested that there is constant immigration and emigration of different modal groups in the fishing area with an interval of two to three months. The exploitation rate was very low for length class between 35-45 cm FL, then increased gradually. The weighted mean exploitation rates were 0.060 and 0.448, respectively for length classes smaller and larger than 55 cmFL. The estimate of the average number of fish attaining a size of 43 cm FL (recruit was 11.0 x 10(6 fish for assumed values of M - 0.7 and K = 0.307. Increasing the fishing mortality rate by 30% and 50%, an estimated increment in yield is 8% and 12%, respectively. From virtual population analysis, we obtained the biomass estimate of skipjack population older than two years-old to be 70.3 thousand tonnes for assumed value of M = 0.7 and the estimated MSY was 24.6 thousand tonnes.

  8. Teenage pregnancy, epidemiological behavior in Las Tunas during the period 2012 - 2014

    Directory of Open Access Journals (Sweden)

    Enelis Reyes Reyes

    2015-06-01

    Full Text Available Background: teenage pregnancy is a medical risk to be considered, not only for determining an increase of maternal morbidity and an estimated of 2 to 3 times infant mortality, but also as one of the most important factors in the occurrence of congenital malformations.Objective: to determine the epidemiological behavior of teenage pregnancy in Las Tunas province during the period 2012 - 2014.Methods: a descriptive, observational and retrospective study of the behavior of teenage pregnancy was carried out in the province and time period previously stated. The study was performed in municipalities and People's Councils. The universe consisted of 148 169 women of childbearing age and the sample comprised 3 309 pregnant female teenagers from 12 to 19 years old.Results: the phenomenon of teenage pregnancy continues, but the province and its municipalities show favorable data; 2013 was the one of the most negative results, being Manatí and Amancio municipalities the most significant ones; in all the municipalities there are People's Councils with results that are higher than municipal and provincial averages. The adolescent fertility rate in the province was between 39.0 and 45.2 per 1000, being 2013 and Amancio municipality the ones with the highest incidence.Conclusions: although the teenage pregnancy continues, the province and its municipalities show favorable data, resulting from an integrated and successful health programs, involving Provincial Genetics Network work.

  9. Encapsulation of mixtures of tuna oil, tributyrin and resveratrol in a spray dried powder formulation.

    Science.gov (United States)

    Sanguansri, Luz; Day, Li; Shen, Zhiping; Fagan, Peter; Weerakkody, Rangika; Cheng, Li Jiang; Rusli, Jenny; Augustin, Mary Ann

    2013-12-01

    Spray dried emulsions are effective for carrying and stabilising combinations of fish oil and tributyrin, fish oil and resveratrol, or fish oil, tributyrin and resveratrol in one formulation. The encapsulation efficiencies were >99% for all three bioactives when a heated mixture of sodium caseinate: glucose: dried glucose syrup matrix (Encapsulant matrix 1) was used. When a heated sodium caseinate: glucose: processed starch matrix (Encapsulant matrix 2) was used, the encapsulation efficiencies were 90-92% for tributyrin and approximately 98% for resveratrol for all formulations but 79-91% for tuna oil where the efficiency was more formulation dependent. There was 84-86% remaining EPA, 85-87% remaining DHA, 85% remaining tributyrin and 94-96% remaining resveratrol after 18 months at 25 °C storage of the spray dried emulsions using Encapsulant matrix 1 across all formulations. In comparison, there was 83-87% remaining EPA and 84-89% remaining DHA, 80-82% remaining tributyrin, and 81-100% remaining resveratrol across all formulations with Encapsulant matrix 2. In vitro studies showed that on sequential exposure to simulated gastric and intestinal fluids, encapsulating the bioactives had little effect on the lipolysis of the oils but affected the amount of solvent extractable resveratrol. The ability of delivering mixtures of bioactives within one formulation was demonstrated.

  10. Banning is not enough: The complexities of oceanic shark management by tuna regional fisheries management organizations

    Directory of Open Access Journals (Sweden)

    Mariana Travassos Tolotti

    2015-07-01

    Full Text Available Recently, declining populations of several pelagic shark species have led to global conservation concerns surrounding this group. As a result, a series of species-specific banning measures have been implemented by Regional Fishery Management Organizations (RFMOs in charge of tuna fisheries, which include retention bans, finning bans and trading bans. There are both positive and negative aspects to most management measures, but generally, the positive aspects outweigh the negatives, ensuring the measure is beneficial to the resource and its users in the long term. Banning measures are a good first step towards the conservation of pelagic shark species, especially since they improve conservation awareness among fishers, managers and the public. Measures that impose total bans, however, can lead to negative impacts that may jeopardize the populations they were intended to protect. The majority of pelagic shark catches are incidental and most sharks die before they reach the vessel or after they are released. The legislation set out by RFMOs only prevents retention but not the actual capture or the mortality that may occur as a result. Managers should be fully aware that the development and implementation of mitigation measures are critical for a more effective conservation strategy.

  11. Physical oceanographic data from the OTEC Punta Tuna, Puerto Rico Site, September 1979-June 1980

    Energy Technology Data Exchange (ETDEWEB)

    Frye, D.; Davison, A.; Leavitt, K.

    1981-01-01

    The first results of an oceanographic measurement program being conducted off the southeast corner of Puerto Rico are presented. The study site is a proposed OTEC site and is located about 20 km off Punta Tuna. The objectives of the measurement program are to document the physical oceanography of the site as related to the engineering and environmental factors involved in OTEC design and operation. Oceanographic measurements include: (1) a subsurface mooring instrumented with five current, temperature, and pressure recorders; and (2) quarterly hydrographic cruises to measure salinity, temperature, and depth profiles on a grid of 33 stations in the vicinity of the mooring site. The first cruise, conducted between 16 and 21 June 1980, included the initial mooring deployment and a CTD (conductivity, temperature, and depth) and XBT (expendable bathythermograph) survey. The CTD/XBT measurements are presented. Also included are results of in situ current, temperature, and pressure measurements made during two previous programs. In September 1979, Coastal Marine Research (CMR) deployed a mooring at approximately the same site as the present mooring. Results from three of these instruments are included. The Naval Underwater Systems Center deployed a mooring at this site in February 1979 and partial results from one instrument on this mooring are also presented. (WHK)

  12. The influence of finfish aquaculture on benthic fish and crustacean assemblages in Fitzgerald Bay, South Australia.

    Science.gov (United States)

    Tanner, Jason E; Williams, Kane

    2015-01-01

    The influence of sea-cage aquaculture on wildfish assemblages has received little attention outside of Europe. Sea-cage aquaculture of finfish is a major focus in South Australia, and while the main species farmed is southern bluefin tuna (Thunnus maccoyii), there is also an important yellowtail kingfish (Seriola lalandi) industry. Yellowtail kingfish aquaculture did not appear to have any local or regional effects on demersal assemblages (primarily fish, but also some crustaceans) surveyed by baited remote underwater video (BRUV) in Fitzgerald Bay. We did, however, detect small scale spatial variations in assemblages within the bay. The type of bait used strongly influenced the assemblage recorded, with significantly greater numbers of fish attracted to deployments where sardines were used as the bait to compared to those with no bait. The pelleted feed used by the aquaculture industry was just as attractive as sardines at one site, and intermediate between sardines and no bait at the other. There was significant temporal variability in assemblages at both farm sites and one control site, while the second control site was temporally stable (over the 9 weeks of the study). Overall, the results suggested that aquaculture was having little if any impact on the abundance and assemblage structure of the demersal macrofauna in Fitzgerald Bay.

  13. Cloning and expression analysis of vasa during the reproductive cycle of Korean rockfish, Sebastes schlegeli

    Science.gov (United States)

    Mu, Weijie; Wen, Haishen; He, Feng; Li, Jifang; Liu, Miao; Ma, Ruiqin; Zhang, Yuanqing; Hu, Jian; Qi, Baoxia

    2013-03-01

    Vasa, which is a conserved member of the DEAD-box protein family, plays an indispensable role in primordial germ cell proliferation. However, the expression of vasa gene during the reproductive cycle in ovoviviparous fish has not been documented. In this study, the full-length sequence of vasa was obtained from the ovary of Korean rockfish ( Sebastes schlegeli) using reverse transcription-PCR and rapid amplification of cDNA ends. The Vasa with a mature protein of 650 amino acids showed greatest homology (84%) with giant gourami ( Osphronemus goramy) and Pacific bluefin tuna ( Thunnus orientalis). The expression of vasa mRNA in Korean rockfish was detected in gonads only, suggesting its specific role in gonadal development. In addition, seasonal changes in the vasa expression levels were examined in gonads by quantitative real-time PCR. The vasa transcript levels in adult testis were found higher during spermatogenesis than during spermiation. The vasa transcript levels remained relatively high at the early ovary stage but declined during ovary maturation in adult female fish. These results suggest that the vasa gene play an important role in spermatogenesis and early oogenesis during the reproductive cycle of Korean rockfish.

  14. Cloning and Expression Analysis of vasa During the Reproductive Cycle of Korean Rockfish,Sebastes schlegeli

    Institute of Scientific and Technical Information of China (English)

    MU Weijie; WEN Haishen; HE Feng; LI Jifang; LIU Miao; MA Ruiqin; ZHANG Yuanqing

    2013-01-01

    Vasa,which is a conserved member of the DEAD-box protein family,plays an indispensable role in primordial germ cell proliferation.However,the expression of vasa gene during the reproductive cycle in ovoviviparous fish has not been documented.In this study,the full-length sequence of vasa was obtained from the ovary of Korean rockfish (Sebastes schlegeli) using reverse transcription-PCR and rapid amplification of cDNA ends.The Vasa with a mature protein of 650 amino acids showed greatest homology (84%) with giant gourami (Osphronemus goramy) and Pacific bluefin tuna (Thunnus orientalis).The expression of vasa mRNA in Korean rockfish was detected in gonads only,suggesting its specific role in gonadal development.In addition,seasonal changes in the vasa expression levels were examined in gonads by quantitative real-time PCR.The vasa transcript levels in adult testis were found higher during spermatogenesis than during spermiation.The vasa transcript levels remained relatively high at the early ovary stage but declined during ovary maturation in adult female fish.These results suggest that the vasa gene play an important role in spermatogenesis and early oogenesis during the reproductive cycle of Korean rockfish.

  15. Integrating dynamic energy budget (DEB) theory with traditional bioenergetic models.

    Science.gov (United States)

    Nisbet, Roger M; Jusup, Marko; Klanjscek, Tin; Pecquerie, Laure

    2012-03-15

    Dynamic energy budget (DEB) theory offers a systematic, though abstract, way to describe how an organism acquires and uses energy and essential elements for physiological processes, in addition to how physiological performance is influenced by environmental variables such as food density and temperature. A 'standard' DEB model describes the performance (growth, development, reproduction, respiration, etc.) of all life stages of an animal (embryo to adult), and predicts both intraspecific and interspecific variation in physiological rates. This approach contrasts with a long tradition of more phenomenological and parameter-rich bioenergetic models that are used to make predictions from species-specific rate measurements. These less abstract models are widely used in fisheries studies; they are more readily interpretable than DEB models, but lack the generality of DEB models. We review the interconnections between the two approaches and present formulae relating the state variables and fluxes in the standard DEB model to measured bioenergetic rate processes. We illustrate this synthesis for two large fishes: Pacific bluefin tuna (Thunnus orientalis) and Pacific salmon (Oncorhynchus spp.). For each, we have a parameter-sparse, full-life-cycle DEB model that requires adding only a few species-specific features to the standard model. Both models allow powerful integration of knowledge derived from data restricted to certain life stages, processes and environments.

  16. Bluefin 9M AUV Survey of the Hubbard Glacier Morainal Bank: Proof-of-Concept Study of Autonomous Underwater Vehicle Investigations Proximal to a Tidewater Glacier

    Science.gov (United States)

    Goff, J. A.; Gulick, S. P. S.; Lawson, D. E.; O'Halloran, W.

    2014-12-01

    Hubbard Glacier is one of the few advancing tidewater glaciers in the world, offering a premier opportunity for studying ice/sediment/seawater interactions at a tidewater glacier front that is in contact with the stabilizing submarine morainal bank. However, the seafloor and water column proximal to the ice face of a marine-terminating glacier is one of the most challenging and extreme environments imaginable for marine survey work. Frequently choked with constantly-shifting mélange ice at the sea surface and at risk from calving, surface vessels cannot operate safely proximal to the ice face. AUV (Autonomous Underwater Vehicle) technology provides an opportunity to survey in areas where surface vessels cannot. Operating well below the sea surface the AUV can operate without hindrance or danger to human operators. In addition, the AUV can be programmed to operate close to the seafloor at a constant altitude, enabling the finest-detail currently possible for acoustic seafloor mapping and consistent resolution irrespective of water depth. With these considerations in mind, we conducted a proof-of-concept survey of the Hubbard Glacier morainal bank in June, 2014. We utilized the Bluefin 9M, the smallest of their line of AUVs. Its size enabled deployment and recovery from a small charter fishing vessel well-suited to navigating through mélange-choked waters. The AUV's payload included a Klein UUV-3500 interferometric sonar (455/900 kHz), which enables acquisition of sidescan backscatter and swath bathymetry up to ~75 m to each side of the instrument from ~10 m altitude over the seabed, and sensors for measuring conductivity, temperature, depth (CTD) and optical backscatter (OBS). Although our operations were shortened due to an unfortunate failure in the sonar electronics, sufficient data were collected along the morainal bank to clearly prove the viability of AUV operations in this harsh environment. The data provide centimeter-scale seafloor detail close to the

  17. La siembra de tuna (Opuntia ficus-indica (L.) Miller) en un desierto nor costeño, caso CIPTT _ UAP, Mucupe, Chiclayo

    OpenAIRE

    2016-01-01

    La siembra experimental de tuna con riego por goteo, se ha desarrollado en el Centro de Investigación Producción y Transferencia Tecnológica de la Universidad Alas Peruanas y se demuestra un rendimiento bueno (23 TM por cosecha/hectárea) en terrenos eriazos del desierto Norcosteño del Perú .Palabras claves: Tuna, adaptación, siembra, riego. DOI: http://dx.doi.org/10.21503/CienciayDesarrollo.2014.v17i2.03

  18. 公海金枪鱼渔业管理趋势研究%Study on the trend of tuna fishery management on high seas

    Institute of Scientific and Technical Information of China (English)

    聂启义; 黄硕琳

    2011-01-01

    With the recession of fisheries resources on high seas,effective conservation and management of fishery are required urgently.As a kind of important resources on high seas,tuna fishery is managed by many fishery management organizations,takes the leadeship not only in management concepts but also in management practice.This paper breifly introduces the conception of high seas fishery,analyzes the status and trend of tuna fishery management on high seas.On the basis,according to current situation of China's tuna fishery on high seas,this article puts forward some suggestions on developing China's tuna fishery on high seas:(1) strength the policy decision influence in international tuna management organizations;(2) regulate the operations on distant-water tuna fishery,complete the distant-water fishery data base;(3) adjust the structure of distant-water fishery,develop fishing grounds;(4) develop tuna processing industry;(5) develop inland tuna consumption markets;(6) develop distant-water fishery cooperation with Taiwan province of China.%公海渔业资源的衰退迫切要求对公海捕捞作业进行有效的养护和管理。金枪鱼作为一种重要的公海渔业资源,有众多国际渔业管理组织对其进行管理,对公海金枪鱼渔业的管理无论是在管理理念上还是管理实践上都处于领先地位。简要介绍了公海渔业概念,陈述公海金枪鱼渔业管理现状,分析公海金枪鱼渔业管理趋势。在此基础上,根据我国公海金枪鱼渔业现状,提出发展我国公海金枪鱼渔业的建议:(1)加强我国在际金枪鱼管理组织中的政策决策影响力;(2)规范我国公海金枪鱼生产作业,完善远洋渔业数据库;(3)调整远洋渔业结构,积极开发新渔场;(4)发

  19. Colagenosis con afectación dermatológica en edades pediátricas en Las Tunas, 2010 - 2012

    OpenAIRE

    Katiuska Tamayo Mariño; Yordania Velázquez Ávila; Maritza Morales Solís; Teresa Rodríguez Torres; Grisel Arias Hernández

    2014-01-01

    El estudio de las enfermedades del colágeno en edades pediátricas es relativamente joven y no se cuenta en Las Tunas con archivos que permitan evaluar su comportamiento, por ello se realizó un estudio descriptivo, transversal y prospectivo en el período comprendido entre los años 2010 al 2012, para caracterizar a los pacientes ingresados con estas enfermedades en el hospital pediátrico Mártires de Las Tunas. Inicialmente se determinaron las conectivopatias diagnosticadas con más frecuencia y ...

  20. Maximum sustainable speeds and cost of swimming in juvenile kawakawa tuna (Euthynnus affinis) and chub mackerel (Scomber japonicus).

    Science.gov (United States)

    Sepulveda, C; Dickson, K A

    2000-10-01

    Tunas (Scombridae) have been assumed to be among the fastest and most efficient swimmers because they elevate the temperature of the slow-twitch, aerobic locomotor muscle above the ambient water temperature (endothermy) and because of their streamlined body shape and use of the thunniform locomotor mode. The purpose of this study was to test the hypothesis that juvenile tunas swim both faster and more efficiently than their ectothermic relatives. The maximum sustainable swimming speed (U(max), the maximum speed attained while using a steady, continuous gait powered by the aerobic myotomal muscle) and the net cost of transport (COT(net)) were compared at 24 degrees C in similar-sized (116-255 mm fork length) juvenile scombrids, an endothermic tuna, the kawakawa (Euthynnus affinis) and the ectothermic chub mackerel (Scomber japonicus). U(max) and COT(net) were measured by forcing individual fish to swim in a temperature-controlled, variable-speed swimming tunnel respirometer. There were no significant interspecific differences in the relationship between U(max) and body mass or fork length or in the relationship between COT(net) and body mass or fork length. Muscle temperatures were elevated by 1.0-2.3 degrees C and 0.1-0.6 degrees C above water temperature in the kawakawa and chub mackerel, respectively. The juvenile kawakawa had significantly higher standard metabolic rates than the chub mackerel, because the total rate of oxygen consumption at a given swimming speed was higher in the kawakawa when the effects of fish size were accounted for. Thus, juvenile kawakawa are not capable of higher sustainable swimming speeds and are not more efficient swimmers than juvenile chub mackerel.

  1. Evaluación de componentes de rendimiento en tres variedades de sorgo rojo en el sur de Las Tunas.

    OpenAIRE

    Alexis Morell Acosta; Aimé Pérez Matos; Flora Margarita Escudero Samaniego

    2015-01-01

    Con el objetivo de evaluar el rendimiento en tres variedades de sorgo rojo para su empleo en la alimentación animal, se realizó este trabajo en la Cooperativa de Créditos y Servicios (CCS) ¨George Aliaga¨ del municipio Jobabo, en Las Tunas, en el período Julio-Noviembre de 2013. Se utilizó un diseño de bloques al azar, con tres tratamientos y cuatro réplicas, en un suelo fersialítico pardo rojizo con carbonato. El mejor comportamiento para la longitud y peso de la panícula lo obtuvo el ...

  2. Comportamiento de la lepra en la provincia de Las Tunas, 2003-2012

    Directory of Open Access Journals (Sweden)

    Martha O León Cabrales

    2014-08-01

    Full Text Available Se realizó un estudio descriptivo de corte transversal, para determinar algunas características epidemiológicas de la incidencia de la lepra, que es una enfermedad transmisible, tan antigua como el hombre mismo. El universo estuvo constituido por los 103 casos notificados con lepra en la provincia de Las Tunas, en el período de enero de 2003 a diciembre de 2012. La información se obtuvo por las encuestas epidemiológicas existentes en el Departamento de Estadística de la Dirección Provincial de Salud y en el Centro Provincial de Higiene, Epidemiología y Microbiología. Se creó una base de datos en Epinfo versión 3.3.3, donde se tabularon los datos de las encuestas. El análisis de los resultados se expresó en números absolutos, tasas y porcentajes para su mejor interpretación, obteniéndose como resultado que la tasa de detección de casos tiene un comportamiento irregular, el año de mayor incidencia fue el 2009, con 20 casos. Se notificaron tres casos de lepra infantil; las formas paucibacilares representaron el 51,5%; el modo de detección más frecuente fue el espontáneo. Existe transmisión activa y todo ello puede ser reflejo de la ausencia de un trabajo consolidado en el programa de control de la enfermedad

  3. Risk Factors for Seabird Bycatch in a Pelagic Longline Tuna Fishery.

    Directory of Open Access Journals (Sweden)

    Eric Gilman

    Full Text Available Capture in global pelagic longline fisheries threatens the viability of some seabird populations. The Hawaii longline tuna fishery annually catches hundreds of seabirds, primarily Laysan (Phoebastria immutabilis and black-footed (P. nigripes albatrosses. Since seabird regulations were introduced in 2001, the seabird catch rate has declined 74%. However, over the past decade, seabird catch levels significantly increased due to significant increasing trends in both effort and nominal seabird catch rates. We modelled observer data using a spatio-temporal generalized additive mixed model with zero-inflated Poisson likelihood to determine the significance of the effect of various risk factors on the seabird catch rate. The seabird catch rate significantly increased as annual mean multivariate ENSO index values increased, suggesting that decreasing ocean productivity observed in recent years in the central north Pacific may have contributed to the increasing trend in nominal seabird catch rate. A significant increasing trend in number of albatrosses attending vessels, possibly linked to declining regional ocean productivity and increasing absolute abundance of black-footed albatrosses, may also have contributed to the increasing nominal seabird catch rate. Largest opportunities for reductions are through augmented efficacy of seabird bycatch mitigation north of 23° N where mitigation methods are required and during setting instead of during hauling. Both side vs. stern setting, and blue-dyed vs. untreated bait significantly reduced the seabird catch rate. Of two options for meeting regulatory requirements, side setting had a significantly lower seabird catch rate than blue-dyed bait. There was significant spatio-temporal and seasonal variation in the risk of seabird capture with highest catch rates in April and May and to the northwest of the main Hawaiian Islands.

  4. Estabilidad en el almacenamiento congelado de rebanadas de lomo de atún rojo (Thunnus sp. empacadas en atmósfera modificada con CO2

    Directory of Open Access Journals (Sweden)

    Myrna Luisa Medina Bracamonte

    2014-12-01

    Full Text Available La disponibilidad atún rojo fresco, entero y rebanado, como todo producto pesquero fresco está restringida para los consumidores en zonas distantes a los centros de producción por su estabilidad limitada en el almacenamiento. Por ello la industria pesquera en general, en la época de mayor producción, recurre a la congelación para conservar el excedente de producción, y al empacado para protegerlo del ambiente frío y seco del congelador, evitar su deshidratación y “quemaduras por frío”. El surgimiento del Empacado en Atmósfera Modificada como alternativa para incrementar la vida útil de productos alimenticios despertó la inquietud de evaluar la estabilidad de rebanadas de lomo de atún rojo (Thunnus sp. fresco, congeladas y empacadas con 100 % de CO2 durante su almacenamiento a las temperaturas convencionales para su distribución y venta, -10 y -18 ºC, evaluando la estabilidad química, física, microbiológica y sensorial de las rebanadas de lomo de atún rojo durante ≈ 4 meses de almacenamiento congelado. El 50 % de las rebanadas se congeló a -10 ºC (Tratamiento 1 y el 50 % restante a -18 ºC (Tratamiento 2. Las rebanadas congeladas se empacaron individualmente, el 50 % en atmósfera de 100 % de CO2 conservando la proporción 1:2 (rebanada:gas y el 50 % restante en atmósfera de aire. Se almacenaron a la temperatura correspondiente: Tratamiento 1 a -10 ºC y Tratamiento 2 a -18 ºC durante 111 días. Al final del almacenamiento el tratamiento P2 (100 % CO2 ofreció mejor barrera a la pérdida de humedad, favoreció la estabilidad de la fracción de proteínas solubles en solución salina. Las muestras P2 tuvieron mayor aceptación sensorial, fueron las más oscuras y rojas, con menor recuento microbiológico, coincidiendo con el menor contenido en bases volátiles totales. A -10 ºC la atmósfera de 100 % de CO2 no evitó la “quemadura por frío” y los panelistas percibieron el “olor a pescado”.

  5. FISHING GROUND, CACTH COMPOSITION, HOOK RATE AND LENGTH DISTRIBUTION OF BILLFISHES CAUGHT BY TUNA LONG LINE IN INDIAN OCEAN

    Directory of Open Access Journals (Sweden)

    Fathur Rochman

    2013-12-01

    Full Text Available Billfishes area by cacth of tuna long line vessels in Indian Ocean. Billfish are consist of swordfish Xiphias gladius, black marlin Makaira indica, indo facific blue marlin Makaira mazara, stripe marlin Tetrapturus audax, indo facific sailfish Istiophorus platypterus and shortbill spearfish Tetrapturus angustirostris. Besides that, billfishes also have important economic value compared with tuna as an exsported species such as swordfish and marlin. To optimize the catch of billfishes in Indian Ocean, data and information of potential fishing ground, size and catch composition of this species are needed. The billfishes cacth composition collected in 2011 were dominated by 45% swordfish, 20% black marlin, 19% blue marlin,9% short bill spearfish, 6% sailfish and 1%stripe marlin. The billfishes size range which were caught between 60 - 280 cm LJFL (Lower Jaw Fork Length. The sword fish average length was 150 cm, blue marlin 197 cm, black Marlin 189 cm, sailfish 150cm ,short bill spearfish 144 cm and stripe marlin159 cm. From this observation, it was found that most of billfishes caught were in mature.

  6. Fisher-Level Decision Making to Participate in Fisheries Improvement Projects (FIPs) for Yellowfin Tuna in the Philippines

    Science.gov (United States)

    Berentsen, Paul; Bush, Simon R.; Digal, Larry; Oude Lansink, Alfons

    2016-01-01

    This study identifies the capabilities needed by small-scale fishers to participate in Fishery Improvement Projects (FIPs) for yellowfin tuna in the Philippines. The current literature provides little empirical evidence on how different models, or types of FIPs, influence the participation of fishers in their programs and the degree which FIPs are able to foster improvements in fishing practices. To address this literature gap, two different FIPs are empirically analysed, each with different approaches for fostering improvement. The first is the non-governmental organisation-led Partnership Programme Towards Sustainable Tuna, which adopts a bottom-up or development oriented FIP model. The second is the private-led Artesmar FIP, which adopts a top-down or market-oriented FIP approach. The data were obtained from 350 fishers surveyed and were analysed using two separate models run in succession, taking into consideration full, partial, and non-participation in the two FIPs. The results demonstrate that different types of capabilities are required in order to participate in different FIP models. Individual firm capabilities are more important for fishers participation in market-oriented FIPs, which use direct economic incentives to encourage improvements in fisher practices. Collective capabilities are more important for fishers to participate in development-oriented FIPs, which drive improvement by supporting fishers, fisher associations, and governments to move towards market requirements. PMID:27732607

  7. Changes in population structure and growth of skipjack tuna, Katsuwonus pelamis during 30 years of exploitation in the southwestern Atlantic

    Directory of Open Access Journals (Sweden)

    Thais Garbin

    2014-07-01

    Full Text Available The skipjack tuna is the main tuna species caught in Brazil with pole and live-bait. Samples taken during 1984-1986 and the 2004-2009 periods provided length, weight and age data. A comparison of the population structure was made showing a decrease in the median and means of fork length in the 80's (median: 55 cm and recent years (median: 51 cm, an increased participation of smaller individuals (40 cm in recent catches, a high variability of lengths in each year class and a decrease of the condition factor K. These results indicate alterations in the population structure and dynamics. The von Bertalanffy growth parameters calculated for the recent years were L∞= 669 mm; k = 0.24 yr-1; t o = -3.8. CPUE data for the studied period seems to be stable (mean annual catch of 20,000 ton. However, the unit of effort used in Brazil (fishing days does not reflect changes in fishing power and technology properly as occurred during 30 years of exploitation. It is concluded that the present situation requires a close monitoring of the fishery.

  8. Determination of methylmercury in the tuna tissue by High performance liquid chromatography with Inductively Coupled Plasma Mass Spectrometry

    Institute of Scientific and Technical Information of China (English)

    LV Lei; Jiang Zhi-gang; Li Qun; Zhang Shuai

    2009-01-01

    This study mainly applied one kind oftechnologies to determine the methylmercury in the tuna tissue with high performance liquid chromagraphy-inductively coupled plasma nlass spectrometry.We choosed the optmaum conditiom including that the mobile phase Was water with 5% methanol,2-mercaptoethanol,0.06mol/Lammomum acetate and pH6.8.The sample amount was 1OOuL and the flow rate was 0.4mL/min.The optimum checking conditions is that RF power was 1500W,integral time was 0.3s sampling depth Was 8.0mm,velocity of carrier gas Was 0.75L/min and velocity of auxiliary gas Was 0.40L/min.In this con~tiom.the calibration CUrVe was linear when the concentra tions od methylmercury was in the range of 0-4ug/mL(r=0.9996),the detection limit can achieve 9ng/L,RSD is 8.2%,and the addition recovery is 75%-97%.The results show this method is simple,rapid and sensitive and can be used for the daily analysis of tuna samples.

  9. Two new species of parasitic nematodes from the dogtooth tuna Gymnosarda unicolor (Pisces) off the Maldive Islands.

    Science.gov (United States)

    Moravec, Frantisek; Lorber, Julia; Konecný, Robert

    2007-02-01

    Two new nematode species, Philometra gymnosardae n. sp. (Philometridae) and Heptochona maldivensis n. sp. (Rhabdochonidae), are described from the dogtooth tuna Gymnosarda unicolor (Rüppell) (Scombridae, Perciformes) from the Indian Ocean off the Maldive Islands (Republic of Maldives). The former species is characterized mainly by unequal, conspicuously long (859 and 435 microm) spicules; the structure of the caudal end in the male (found in the host's stomach); by markedly large, oval cephalic papillae (n = 8) of the outer circle; the presence of a small, anterior bulb on the very long esophagus; and 2 large caudal projections in the gravid female (parasitic in the host's body cavity). This is the first-known species of Philometra whose gravid females are present in the body cavity of tuna fishes. Heptochona maldivensis resembles H. stromatei but differs mainly in the position of deirids, shape of the muscular esophagus, character of postanal papillae, length of the left spicule (648 microm), much larger body measurements, location in the host (stomach), and the host type. Rhabdochona parastromatei Bilqees, 1971, is synonymized with H. stromatei, whereas Heptochona sindica Akram and Pie de Imprenta, 1988, and H. rivdica Akram, 1988, are invalid names. Heptochona varmai is transferred to another genus as Rhabdochona varmai (Gupta and Masoodi, 1990) n. comb. Rhabdochona varmai, Heptochona schmidtii Arya, 1991, and Rhabdochona marina Lakshmi and Sudha, 1999, are considered species inquirendae.

  10. Three genetic stocks of frigate tuna Auxis thazard thazard (Lacepede, 1800) along the Indian coast revealed from sequence analyses of mitochondrial DNA D-loop region

    Digital Repository Service at National Institute of Oceanography (India)

    GirishKumar; Kunal, S.P.; Menezes, M.R.; Meena, R.M.

    . is that larvae have the widest range of temperature tolerance (between 21.6 0C and 30.5 0C) among tuna species studied. The maximum population doubling time is less than 15 months while maximum reported age is five years. It feeds on small fish, squids...

  11. The age of the Tunas formation in the Sauce Grande basin-Ventana foldbelt (Argentina): Implications for the Permian evolution of the southwestern margin of Gondwana

    Science.gov (United States)

    López-Gamundí, Oscar; Fildani, Andrea; Weislogel, Amy; Rossello, Eduardo

    2013-08-01

    New SHRIMP radiogenic isotope dating on zircons in tuffs (280.8 ± 1.9 Ma) confirms the Early Permian (Artinskian) age of the uppermost section of the Tunas Formation. Tuff-rich levels in the Tunas Formation are exposed in the Ventana foldbelt of central Argentina; they are part of a deltaic to fluvial section corresponding to the late overfilled stage of the Late Paleozoic Sauce Grande foreland basin. Recent SHRIMP dating of zircons from the basal Choiyoi volcanics exposed in western Argentina yielded an age of 281.4 ± 2.5 Ma (Rocha-Campos et al., 2011). The new data for the Tunas tuffs suggest that the volcanism present in the Sauce Grande basin can be considered as the distal equivalent of the earliest episodes of the Choiyoi volcanism of western Argentina. From the palaeoclimatic viewpoint the new Tunas SHRIMP age confirms that by early Artinskian glacial conditions ceased in the Sauce Grande basin and, probably, in adajacent basins in western Gondwana.

  12. Effect of temperature and glassy states on the molecular mobility of solutes in frozen tuna muscle as studied by electron spin resonance spectroscopy with spin probe detection.

    Science.gov (United States)

    Orlien, Vibeke; Andersen, Mogens L; Jouhtimäki, Saara; Risbo, Jens; Skibsted, Leif H

    2004-04-21

    The mobility of solutes in frozen food systems (tuna muscle, sarcoplasmic protein fraction of tuna muscle, and carbohydrate-water) has been studied using the temperature dependence of the shape of electron spin resonance (ESR) spectra of the spin probe 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL). The spin probe was incorporated into the tuna meat from an aqueous solution of TEMPOL or by contact with a layer of TEMPOL crystals. The melting/freezing of freeze-concentrated solutes in frozen tuna meat was observed to take place over a range of temperatures from -25 to -10 degrees C. Lower temperatures gave ESR powder spectra due to the decreased mobility of the spin probe, and the temperature dependence of the mobility of the spin probe did not show abrupt changes at the glass transition temperatures of the systems. The mobility of nonglass forming solutes is concluded to be decoupled from the glass forming components. Similar behavior was also observed for TEMPOL in frozen, aqueous carbohydrate systems. The temperature dependence of the mobility of TEMPOL in the frozen systems was analyzed using the Arrhenius equation, and the logarithm of the Arrhenius preexponential factor tau(a) was found to be linearly correlated with the activation energy for all of the tuna and carbohydrate samples, indicating a common molecular mechanism for the observed mobility of TEMPOL in all of the systems. The linear correlation also suggests that the observed mobility of TEMPOL in the frozen aqueous systems is dominated by enthalpy-entropy compensation effects, where the mobility of TEMPOL is thermodynamically strongly coupled to the closest surrounding molecules.

  13. UNIVERSITAS: A PROJECT WITH A HUMANIST AND INTEGRAL CULTURE APPROACH IN LAS TUNAS UNIVERSITY CENTER / UNIVERSITAS: PROYECTO POR UN PERFIL HUMANISTA Y DE CULTURA INTEGRAL EN EL CENTRO UNIVERSITARIO DE LAS TUNAS

    Directory of Open Access Journals (Sweden)

    Rafaela Macías Reyes

    2010-10-01

    Full Text Available UNIVERSITAS is a project of sociocultural transformation in Las Tunas university center, with the aim to impel the development of the integral culture in the university community. The knowledge and deepening in the needs, interests, hoping, ways of thinking and acting; in an analysis of the reality, ease the elaboration of the project; which enriches the cultural spectrum of the university community. It is supported by a body of theoretical and methodological budget. Its system of actions is based on newness ideas bind to mechanism of supervisory as: the coordinator group of the project, the orientation bureau, and at the same time the functioning of fixed spaces as: the university theater, the room for exhibitions, Univideo, student’ house, ropes, voices, university and creators, a date with craftsman, dance and music.

  14. Hooking rates distribution of Thunnus obesus in tuna longlining ground and its relationship with SST in the western tropical Atlantic Ocean%热带大西洋西部水域大眼金枪鱼延绳钓渔场分布及其与表温之间的关系

    Institute of Scientific and Technical Information of China (English)

    朱国平; 许柳雄

    2008-01-01

    根据2004年9月至2005年3月农业部渔业观察员项目在热带大西洋西部水域调查所获得的渔业数据和现场表温数据,结合哥伦比亚大学网站下载的1°×1°表温资料,利用地理信息系统(GIS)软件Marine explore 4.0图示了各月钓获率及钓获率与表温关系的分布并进行分析.结果表明,2004年11月的产量和CPUE均达到最高,分别为24.539 t和0.332 t/v · d.调查期间,各月钓获率大部分(80.3%)分布在表温高于26.0 ℃.

  15. 4种保鲜处理对冰温贮藏金枪鱼片生物胺的影响%Effects of 4 Packaging Methods on Biogenic Amines Formation in Yellowfin Tuna (Thunnus albacares) Fillets under Controlled Freezing-point Temperature

    Institute of Scientific and Technical Information of China (English)

    李苗苗; 王江峰; 徐大伦; 张后程; 杨文鸽; 张进杰

    2015-01-01

    以新鲜金枪鱼片为研究对象,通过测定并对比PE保鲜膜托盘包装(PE)、真空包装(VP)、气调包装(MAP,100%CO2)和壳聚糖涂膜包装(CF)4种保鲜处理金枪鱼片在-1℃冰温贮藏过程中生物胺、三甲胺(TMA)和总菌落数的变化,筛选最适合的冰温贮藏金枪鱼片的保鲜包装方法.研究结果表明,冰温贮藏过程中所有方法处理样品的总生物胺含量、三甲胺含量和菌落总数均逐渐上升;保鲜处理对腐胺、色胺和苯乙胺的抑制作用无明显差异,精胺和亚精胺仅在驻藏前期被检出.CF处理对金枪鱼片生物胺的抑制效果最佳,尸胺被完全抑制,组胺质量分数小于50 mg/kg.在抑制菌和三甲胺方面,CF处理也比MAP、PE和VP的效果好.4种包装处理对冰温贮藏金枪鱼片中总生物胺的产生和微生物滋生的抑制作用顺序为PE<VP<MAP<CF.

  16. MARICULTURE ON CROATIAN ISLANDS

    Directory of Open Access Journals (Sweden)

    Gordana Šarušić

    2000-09-01

    Full Text Available The first attempts of intensive mariculture in Croatia commenced at the very beginning of 1980’s. The mid-eighties brought an expansion of mariculture production, which has been continuously increasing. A few different marine organisms are intensively cultured - both fish and shellfish. Among them commercially most important and highly valued species are sea bass Dicentrarchus labrax and sea bream Sparus aurata. Mussel Mytilus galloprovincialis and oyster Ostrea edulis are the most important shellfish. Fish species such as dentex Dentex dentex, red sea bream Pagrus major and sheepshead bream Puntazzo puntazzo are reared too, but in a rather small quantities. Only recently the rearing, on-growing- of bluefin tuna Thunnus thynnus started in Croatia. The juveniles (70% are reared in a Croatian hatcheries, and 30% has to be imported mainly from Italy and France, due to a higher demand for this kind of culture among the small growers. Croatian part of Adriatic sea possesses a number of geomorfologicaly suitable sites and meteorological conditions which determined the choice - type - of intensive culture. All fish species are reared in a floating cages. The choice of cages i. e. semi off-shore or floating frames, size, rearing volume and design depend on the investors personal preference. The annual turnouf of a market size bass was about 600t and 300t bream in 1996., by 10 island farms which is 70% of total production in Croatia. Including other cultured fish species last year production was up to 1000t, and it™s being estimated to be about 1300t in the following year. The shellfish production on the islands is usually individual attempt of farmers, producing minor quantities mostly in polyculture. This production has bigger potential but it’s limited owing to the EU quality control regulations which do not allow the export, and by domestic market which has drastically decreased due to the collapse of tourism during the recent war. Almost 80

  17. Efectividad del tratamiento acupuntural en la Parálisis Facial Periférica. Puerto Padre, Las Tunas

    OpenAIRE

    Dorania Cera Barea; José Ramón Martínez Pérez; Rubiseida Almaguer Pérez; Dennis Ballester Domínguez

    2015-01-01

    Se realizó un estudio experimental en pacientes mayores de 19 años, con Parálisis Facial Periférica, que fueron atendidos en el Policlínico "Romárico Oro Peña" del municipio de Puerto Padre, provincia de Las Tunas; en el período comprendido entre enero y diciembre del año 2011. La muestra quedó conformada por 40 pacientes que cumplieron con los criterios de inclusión establecidos, a los que se les aplicó el método acupuntural, con el objetivo de evaluar la efectividad del mismo en el tratamie...

  18. Development and validation of a radioimmunoassay for fish insulin-like growth factor I (IGF-I) and the effect of aquaculture related stressors on circulating IGF-I levels.

    Science.gov (United States)

    Dyer, Anthony R; Upton, Zee; Stone, David; Thomas, Philip M; Soole, Kathleen L; Higgs, Naomi; Quinn, Kirsty; Carragher, John F

    2004-02-01

    This paper describes the development and validation of a commercially available radioimmunoassay (RIA) for the detection of fish insulin-like growth factor-I (IGF-I). The assay was developed using recombinant barramundi IGF-I as antigen and recombinant tuna IGF-I as radiolabelled tracer and standard. Assay sensitivity was 0.15 ng/ml, inter-assay variation was 16% (n = 9) and intra-assay variation was 3% (n = 10). Cross reactivity of less than 0.01% was found with salmon insulin, salmon IGF-II and barramundi IGF-II, less than 0.5% with human IGF-I and less than 1% with human IGF-II. Parallel dose-response inhibition curves were shown for barramundi (Lates calcarifer), coho salmon (Oncorhynchus kisutch), Southern Bluefin tuna (Thunnus maccoyii), tilapia (Oreochromis mossambicus), and seabream (Pagrus auratus) IGF-I. The assay was then used to measure stress related changes in different aquacultured fish species. Salt water acclimated Atlantic salmon smolts (Salmo salar) bathed for 2 h in fresh water showed significantly lower IGF-I concentrations than control smolts two days after the bath (53.1 compared to 32.1 ng/ml), with levels of IGF-I also lower in smolts exhibiting stunted growth (stunts). Capture and confinement of wild tuna in sea-cages resulted in a significant decrease in IGF-I levels (28 ng/ml) when compared to tuna captured and sampled immediately (48 ng/ml), but had recovered to starting levels after 3 weeks (43 ng/ml). Handling and isolation in silver perch (Bidyanus bidyanus) led to a gradual decline in IGF-I over a 12 h period (36-19 ng/ml) but showed signs of recovery by 24 h (24 ng/ml) and had recovered fully 72 h after treatment (40 ng/ml). A similar trial in black bream (Acanthopagrus butcherii) showed comparable results with IGF-I levels gradually decreasing (40-26 ng/ml) over 24 h, results that were mirrored by cortisol concentrations which increased during this time (1-26 ng/ml). In the studies presented here changes in IGF-I levels were not

  19. Evaluación de componentes de rendimiento en tres variedades de sorgo rojo en el sur de Las Tunas.

    Directory of Open Access Journals (Sweden)

    Alexis Morell Acosta

    2015-12-01

    Full Text Available Con el objetivo de evaluar el rendimiento en tres variedades de sorgo rojo para su empleo en la alimentación animal, se realizó este trabajo en la Cooperativa de Créditos y Servicios (CCS ¨George Aliaga¨ del municipio Jobabo, en Las Tunas, en el período Julio-Noviembre de 2013. Se utilizó un diseño de bloques al azar, con tres tratamientos y cuatro réplicas, en un suelo fersialítico pardo rojizo con carbonato. El mejor comportamiento para la longitud y peso de la panícula lo obtuvo el CIAP 9E-95, también en rendimiento en granos y residuos de cosecha, con diferencias significativas del resto de los tratamientos. El CIAP132R resultó el de peor comportamiento en los parámetros evaluados a las panículas, granos y planta; no obstante, sus resultados en producción de granos fueron aceptables. El CIAP2E-95 mostró valores intermedios para todos los indicadores evaluados. Los resultados alcanzados evidenciaron que durante el período lluvioso es posible obtener aceptables producciones de granos y biomasa verde en el sur de Las Tunas. El análisis de los datos se realizó mediante el paquete Infostat y se utilizó la prueba de Duncan para la comparación de las medias. Además los indicadores económicos confirman la factibilidad y posibilidades de las variedades estudiadas.

  20. Evaluación del estado mental de los pacientes centenarios en Las Tunas, diciembre 2007- agosto 2008

    Directory of Open Access Journals (Sweden)

    Lisset del Carmen Romero Portelles

    2015-12-01

    Full Text Available El envejecimiento de la población en Cuba es similar al de muchos países desarrollados, y se encuentra entre los que tienen un índice más elevado dentro del grupo de países en desarrollo. Se realizó un trabajo descriptivo observacional  en la provincia de Las Tunas, en el período diciembre 2007- agosto 2008, con el propósito de caracterizar el estado cognitivo-afectivo de los centenarios. El universo estuvo  constituido por 97 ancianos; una vez validada su edad, la muestra quedó conformada con 95 centenarios. Se aplicaron los instrumentos Mini-Mental State Examination (MMSE y Clinical Dementia Rating Scale (CDR y se estudiaron las siguientes variables: estado cognitivo, estado de ánimo, satisfacción con la vida, nivel de tensión y la percepción de eventos vitales. El dato primario provino de las entrevistas realizadas, y para el análisis estadístico se creó una hoja de cálculo en Excel. Se utilizaron técnicas de distribución de frecuencias; para las variables cuantitativas se empleó la proporción en porcentaje. En la muestra de individuos centenarios que vivían en la provincia de Las Tunas, al momento del estudio, predominaron los que no presentaban deterioro cognitivo ni depresión, tuvieron  satisfacción alta con la vida, nivel bajo de tensión y no se afectaban con los eventos vitales. Las positivas características psicológicas y de resiliencia, unidas a un entorno psicosocial favorable, se relacionan con la larga supervivencia de los individuos estudiados.

  1. COMPORTAMIENTO DE MORTALIDAD EN EL SERVICIO DE NEFROLOGÍA. AÑOS 2009-2010. LAS TUNAS.

    Directory of Open Access Journals (Sweden)

    Rodríguez López Jose Luis

    2011-01-01

    Full Text Available Introduction: One of the fundamental problems that the Nefrología faces in the current time is the growing number of patient with Inadequacy Renal Terminal Chronicle that you/they require substitute treatments of the renal function to survive. Objectives: To analyze the behavior of the mortality and the factors that influenced in the patients that were carried out treatment of chronic hemodiálisis during the years 2009-2010 in the service of Nefrología of the Hospital G. Doc "Dr. Ernesto Guevara of the Serna", Las Tunas City. Method: He/she was carried out a descriptive-retrospective study of traverse court 2 years old 2009-2010, in the service of Nefrología of the Hospital G. Doc. "Dr. Ernesto Guevara of the Serna" of The Tunas that it analyzed the mortality in patient with treatment of chronic hemodiálisis. The sample was constituted by 36 deceaseds. Results: The cause of Inadequacy Renal more frequent Terminal Chronicle was the Arterial Hypertension, most of the deceaseds had more than 65 years of age and a strong association existed among the beginning way, attention previous nefrológica, type of vascular access and time of permanency in hemodiálisis. The cardiovascular illnesses went those more associated to The Inadequacy Renal Chronicle and they constituted the main causes of death, followed by the sepsis. Most of the carried out autopsies had pathological clinical relationship. Conclusions: We recommend to increase the pesquizaje of patient with Inadequacy Renal Chronicle in the Primary Attention of Health for their precocious remission to the nefrólogo, it stops this way to slow their progression to the terminal phase and to achieve their best preparation for the treatment dialítico and the renal transplant, what will allow a better quality of life and a decrease of the mortality.

  2. EL FENÓMENO SOCIO RELIGIOSO EN LAS TUNAS. EL PENTECOSTALISMO Y SU INFLUENCIA PARA UNA CONCEPCIÓN IDENTITARIA

    Directory of Open Access Journals (Sweden)

    Enrique Antonio Lalana Torres

    2015-01-01

    Full Text Available Resumen El pentecostalismo como componente del campo religioso del territorio de Victoria de Las Tunas, los aportes a la identidad cultural son los hilos conductores de este trabajo. Comprende además un análisis del proceso de asentamiento y desarrollo del mismo a partir del análisis de las fuentes históricas y socioculturales. Su génesis primaria responde a condicionantes propias de las transformaciones de Europa Occidental durante el siglo XVI y, consciente o no sus fundadores promulgaron las bases para el correlato religioso del nuevo orden socio económico que se gestaba: el capitalismo. Las implicaciones a la identidad cultural en las regiones donde se asentaron y desarrollaron este tipo de denominaciones generaron comportamientos interesantes que constituyen un importante objeto de estudio para su mejor comprensión. ABSTRACT Pentecostalism as a component of the religious field of the territory of Victoria de Las Tunas, contributions to cultural identity are the threads of this work. It includes an analysis of the process of settlement and development of the same from the analysis of historical and sociocultural sources. Its primary genesis responds to own conditions of transformations of Western Europe during the sixteenth century and, consciously or not its founders enacted the basis for the religious correlate the new socioeconomic order that was brewing: capitalism. The implications for cultural identity in the regions where they settled and developed this kind of names generated interesting behaviors that constitute an important object of study for better understanding.

  3. Early developmental characteristics of external apparatus of bluefin leatherjacket Thamnaconus modestus%绿鳍马面鲀外部器官的早期发育

    Institute of Scientific and Technical Information of China (English)

    关健; 刘洪军; 郑永允; 李祥东; 于道德; 陈海滨; 官曙光

    2012-01-01

    This study described the developmental characteristics of external apparatus during early life stages of bluefin leatherjacket, Thamnaconus modestus. The developmental morphological characteristics of 11 external apparatus were recorded and described in detail. 1) Mouth; opened at 2-3 dph(days post hatching), then grew continuously except at the stagnation stage (24-28 dph). 2) Eyes: pigment appeared at 1 dph, choroids formed and the pupil was black at 3 dph, sclera formed at 4 dph, rim of the eye appeared at 14 dph, and the eye form was same with adults at 40 dph basically. 3) First dorsal fin spine: anlage appeared at 3 dph, fin spine formed initially at 7-8 dph, protruded out of body at 10 dph, development finished roughly at 14 dph, and the shape was the same with adult at 60dph basically. 4) Girdles and pelvic fin spine: Girdles appeared at 5 dph, pelvic fin spine grew fast at 5-7 dph, and shunk from l0dph, all pelvic fin spine off at 30 dph. The shape of girdles was the same with adult at 60 dph. 5) Pectoral fin: fin membrane thickened and the fin ray formed at 15dph, developed completely at 30 dph. 6) Dorsal fin and anal fin: fin suspensorium and fin ray appeared at 14 dph, fin ray developed completely at 24dph, and the shape at 60 dph was the same with adult's. 7) Caudal peduncle: caudal vertebra was straight until 14dph, some fin ray anlage appeared under the tail end of notochord at 16 dph. The tail end of notochord up-curved, fin ray developed completely and sub-section at 16-24 dph. Caudal fin turned into rotundity at 50 dph. 8) Scales and skin: epidermis thickened at 8dph, the compact epidermis appeared first at head, full body covered by scales at 40dph, turned into withy leathery epidermis. 9) Abdomen and splanchnic zone: yolk-sac was absorbed, anus and the first intestinal loop formed at 2 dph, oil ball disappeared and the fish larvae fed on the oyster larvae. The anlages of liver, kidney and swim bladder appeared at 8-12 dph, and the three organ

  4. Global pollution monitoring of polychlorinated dibenzo-p-dioxins (PCDDs), furans (PCDFs) and coplanar polychlorinated biphenyls (coplanar PCBs) using skipjack tuna as bioindicator

    Energy Technology Data Exchange (ETDEWEB)

    Ueno, D.; Watanabe, M.; Subraminian, A.N.; Tanabe, S. [Ehime Univ. (Japan); Tanaka, H. [National Research Inst. of Fisheries and Environment of Inland Sea (Japan); Fillmann, G. [Fundacao Univ. Federal do Rio Grande (Brazil); Lam, P.K.S.; Zheng, G.J. [City Univ. of Hong Kong (Hong Kong); Muchtar, M.; Razak, H. [Indonesian Inst. of Sciences (Indonesia); Prudente, M. [De La Salle Univ. (Philippines); Chung, K. [Sungkyunkwan Univ. (Korea)

    2004-09-15

    Worldwide contamination by dioxins and related compounds, such as polychlorinated dibenzop- dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and coplanar polychlorinated biphenyls (coplanar PCBs) representing persistent organic pollutants (POPs) have been of great concern due to their persistency in the environment, highly bioaccumulative nature and adverse effects on wildlife and humans. Several studies on air samples and marine organisms from open seas suggested a long range transport of these compounds through atomosphere. Although several investigators have monitored dioxins pollution in localized areas, information on the global distribution of dioxins which can explain their atomospheric transport, behavior and fate are still limited. Skipjack tuna is primarily distributed from offshore waters to open seas in tropical and temperate regions almost all over the world such as the Pacific, Atlantic and Indian Oceans6. This species is an important commercial fish and its ecology and biology has been well studied. Moreover, suitability of skipjack tuna for global monitoring of organic pollutants (DDTs, HCHs PBDEs, organotins, etc.) has been established in our previous report, indicating that migration pattern, growth stage and sex of these animals have no or little effect on the variations of POPs residue levels in their bodies. Hence this species reflected POPs pollution levels in seawater when and where they were collected, caused by the rapid equilibrium partitioning between seawater and body lipid. These facts made skipjack tuna a suitable bioindicator for monitoring the contamination status of dioxins and related compounds. The objectives of this study are to elucidate the global distribution of dioxins (PCDD/Fs and coplanar PCBs) in offshore waters and open seas, and to understand the transport and behaviour of these chemicals using skipjack tuna as bioindicator.

  5. Determination of trans- and cis-urocanic acid in relation to histamine, putrescine, and cadaverine contents in tuna (Auxis Thazard) at different storage temperatures.

    Science.gov (United States)

    Zare, Davood; Muhammad, Kharidah; Bejo, Mohd Hair; Ghazali, H M

    2015-02-01

    Scombroid fish poisoning is usually associated with consumption of fish containing high levels of histamine. However, reports indicate that some cases have responded to antihistamine therapy while ingested histamine levels in these cases were low. Potentiation of histamine toxicity by some biogenic amines, and release of endogenous histamine by other compounds such as cis-urocanic acid (UCA) are some hypotheses that have been put forth to explain this anomaly. Very little is known about the effects of storage conditions on the production of both UCA isomers and biogenic amines in tuna. Thus, the production of trans- and cis-UCA, histamine, putrescine, and cadaverine in tuna during 15 d of storage at 0, 3, and 10 °C and 2 d storage at ambient temperature were monitored. The initial trans- and cis-UCA contents in fresh tuna were 2.90 and 1.47 mg/kg, respectively, whereas the levels of putrescine and cadaverine were less than 2 mg/kg, and histamine was not detected. The highest levels of trans- and cis-UCA were obtained during 15 d storage at 3 °C (23.74 and 21.79 mg/kg, respectively) while the highest concentrations of histamine (2796 mg/kg), putrescine (220.32 mg/kg) and cadaverine (1045.20 mg/kg) were obtained during storage at room temperature, 10 and 10 °C, respectively. Histamine content increased considerably during storage at 10 °C whereas trans- and cis-UCA contents changed slightly. The initial trans-UCA content decreased during storage at ambient temperature. Thus, unlike histamine, concentrations of trans- and cis-UCA did not result in elevated levels during storage of tuna.

  6. Optimising fisheries management in relation to tuna catches in the western central Pacific Ocean : a review of research priorities and opportunities

    OpenAIRE

    Evans, K.; Young, J. W.; Nicol, S.; Kolody, D.; Allain, V.; Bell, J.; Brown, J. N.; Ganachaud, Alexandre; Hobday, A.J.; Hunt, B.; Innes, J; Sen Gupta, A.; van Sebille, E.; Kloser, R; Patterson, T.

    2015-01-01

    Some of the most important development goals for the countries and territories of the Western and Central Pacific Ocean (WCPO) involve the sustainable management of their fisheries in light of environmental, economic and social uncertainties. The responses of fish populations to variability in the marine environment have implications for decision making processes associated with resource management. There is still considerable uncertainty in estimating the responses of tuna populations to sho...

  7. Effects of the addition of spleen of skipjack tuna (Katsuwonus pelamis) on the liquefaction and characteristics of fish sauce made from sardine (Sardinella gibbosa)

    OpenAIRE

    Klomklao, Sappasith; Benjakul, Soottawat; Visessanguan, Wonnop; Kishimura, Hideki; Simpson, Benjamin K.

    2006-01-01

    The effects of the addition of spleen of skipjack tuna (Katsuwonus pelamis), at levels of 0%, 10% and 20%, on the liquefaction and characteristics of fish sauce produced from the sardine (Sardinella gibbosa) with different salt concentrations (15%, 20% and 25%) were monitored during fermentation for 180 days. Fish sauces prepared from sardine with spleen supplementation contained greater total nitrogen, amino nitrogen, formaldehyde nitrogen and ammonia nitrogen than did those without spleen a...

  8. A Case for National Security: Using the Might Tuna to Frame U.S. Coast Guard’s Role in the Strategic Shift to the Pacific

    Science.gov (United States)

    2014-06-13

    followed by Africa, Latin America and the Caribbean , North America and Europe.”202 “The United States is the fifth largest fishing nation in the world...food security .” The DOS strategic and performance goals focus on two major objectives: “regional stability and social and environmental partnerships...A CASE FOR NATIONAL SECURITY : USING THE MIGHT TUNA TO FRAME U.S. COAST GUARD’S ROLE IN THE STRATEGIC SHIFT TO THE PACIFIC A

  9. 远洋金枪鱼围网渔船总布置特征%General Arrangement Features for Pelagic Fishing Boat of Tuna Purse Net

    Institute of Scientific and Technical Information of China (English)

    孙文志; 卢振义; 张维英; 李明; 刁有明

    2011-01-01

    在收集一些实船图纸资料,实船调查、总结和分析的基础上,阐述了远洋金枪鱼围网渔船总布置的基本原则及其特征,同时根据远洋金枪鱼围网渔船的渔捞作业特点,说明了渔捞设备布置形式和作业流程,以及"内胆式"浓盐水舱速冻作业流程及其特点.可为远洋金枪鱼围网渔船总布置设计提供参考.%The basic principles and features of general arrangement of pelagic tuna purse net are expounded based on collecting some drawing and deep investigation on existed ships. According to the operating characteristics of tuna purse net, the general form of fishing equipment and technological process are also presented and the quick-freezes operation technological process and their characteristics of brine cabin which form is lining are depicted. It provides a reference model for pelagic fishing boat of tuna purse net general arrangement design.

  10. The large-scale deployment of fish aggregation devices alters environmentally-based migratory behavior of skipjack tuna in the Western Pacific Ocean.

    Directory of Open Access Journals (Sweden)

    Xuefang Wang

    Full Text Available Fish aggregation devices (FADs have been used extensively in the tuna purse seine fishery since the 1980s. This long-term modification of natural habitat has generated discussions as to whether FADs impact movement patterns of tuna species. We examined this question using data collected from the skipjack tuna (Katsuwonus pelamis fishery. We used the longitudinal gravitational center of catch (G to examine temporal variability in skipjack movement in the Western and Central Pacific Ocean, and related this to El Niño Southern Oscillation (ENSO events. We found that in most cases G for free-swimming school sets changed with the onset of ENSO events, while G for floating-object-associated school sets remained relatively constant. This suggests that skipjack exhibit distinguishable behavioral strategies in response to ENSO events: they either react by moving long distances or they associate with floating objects. There has been no previous attempt to evaluate the interaction between FADs and the environmentally-determined movement of skipjack; this study shows evidence of an interaction, which should be considered when managing skipjack populations.

  11. Aniversario XXX de la creación del Centro Provincial de Información de Las Tunas

    Directory of Open Access Journals (Sweden)

    Edenny Reina Castillo Montes de Oca

    2014-08-01

    Full Text Available El 4 de enero de 1984 se inauguró el Centro Provincial de Información de Ciencias Médicas de Las Tunas, lo que permitió organizar la Red Provincial de Bibliotecas Médicas y con ello crear nuevos escenarios para desarrollar la actividad científico - informativa en el territorio; con la apertura de una biblioteca en cada unidad de salud. El Centro inicialmente estuvo ubicado en un pequeño local cercano a la biblioteca del Hospital “Dr. Ernesto Guevara de la Serna”. En el año 1988; con la misión, la visión y los objetivos de trabajo de su objeto social bien definidos, fue trasladado para la Facultad de Ciencias Médicas “Dr. Zoilo Marinello Vidaurreta”, de la provincia de Las Tunas y al crearse la Universidad de Ciencias Médicas en esta provincia, el Centro Provincial de Información pasa a ser una dependencia directa de la misma. En la primera década se sentaron las bases de lo que es hoy el Sistema Provincial de Información de Ciencias de la Salud, constituido por 25 bibliotecas médicas distribuidas en toda la geografía tunera, con la misión de: “garantizar la prestación de servicios de información científico tecnológica a la comunidad de profesionales que conforman el sector de la salud en la provincia, con el fin de elevar la calidad de la asistencia, la investigación, la docencia, la dirección y la cultura médica nueva y propiciar el hallazgo de soluciones que posibiliten enfrentar los problemas de salud”. Durante estos 30 años, los trabajadores de la información en el territorio han laborado con verdadera dedicación para cumplir cada tarea encomendada, asumir los retos del desarrollo continuo de la ciencia, asimilar las nuevas tecnologías y brindar a nuestros usuarios servicios y productos de alto valor informacional. La movilización de recursos lograda a través de los proyectos de la Red Nacional de Salud INFOMED, entre los cuales figuran: Proyecto SIDA, Proyecto para la Promoción de Publicaciones

  12. CONTRIBUTE TO THE CULTURAL DEVELOPMENT OF LAS TUNAS CITY OF DIOSCÓRIDE T. FUERTE BORGES / APORTES AL DESARROLLO CULTURAL DE LAS TUNAS DE DIOSCÓRIDE T. BORGES FUERTE

    Directory of Open Access Journals (Sweden)

    Katia Susana Hernández Moreno

    2012-09-01

    Full Text Available In this investigation it was carried out a valuation of the elements that distinguish the cultural work of Dioscóride T. Borges Fuerte and their contributions to the cultural development of Las Tunas, through the significance of their cultural chore, to become an artisan Luthiers of great relevance. It is sought to achieve the recognition of a personality of the culture, illustrating in the document that contains their history of life their contributions and taxes from the luthiería to the cultural development of the county. In the investigation it was made use of the History of Life like qualitative method to achieve an approach to Borges' life and to reveal their contributions to the cultural development through their contribution to the music, the construction of guitars, formation of new generations and innovation in the luthiería. The reach and transcendency of the work of the eminent Luthiers stands out among musicians, professors, students, personalities of the culture and manufacturers of guitars in the whole country.

  13. Caracterización de los pacientes con cirrosis hepática atendidos en Las Tunas

    Directory of Open Access Journals (Sweden)

    Alina Torreblanca Xiques

    2014-11-01

    Full Text Available Se realizó un estudio observacional descriptivo, con el objetivo de caracterizar los pacientes con cirrosis hepática (CH, atendidos en el servicio de gastroenterología del Hospital General Docente “Dr. Ernesto Guevara de la Serna”, Las Tunas, Cuba, en el período comprendido entre febrero de 2012 y febrero de 2014. Se estudiaron 55 pacientes con cirrosis hepática diagnosticada por laparoscopia. Predominaron los pacientes del grupo de edad entre 50 y 59 años, siendo el sexo masculino el más afectado. Las principales manifestaciones clínicas que se apreciaron en estos pacientes fueron la ascitis y los edemas en miembros inferiores, así como las complicaciones más frecuentemente encontradas, la ascitis y la hemorragia digestiva alta. El alcoholismo y la etiología viral por virus C se presentaron con mayor frecuencia, predominando el primero. En el mayor por ciento de los pacientes debutó la enfermedad con al menos una complicación

  14. Optimizing Conditions for the Purification of Omega-3 Fatty Acids from the By-product of Tuna Canning Processing

    Directory of Open Access Journals (Sweden)

    Teti Estiasih

    2013-05-01

    Full Text Available This research studied the optimization conditions for separation and purification of omega-3 (&omega-3 fatty acids from the by-product of tuna canning processing by urea crystallization. Crystallization reaction conditions of urea inclusion (urea to fatty acid ratio (X1 and crystallization time(X2 were optimized using the Response Surface Methodology (RSM and a model was developed. Optimization results showed a quadratic polynomial regression equation of Y = 24.44X1+5.65X2-8.71XX1 2-0.19X22+1.171X1X2- 12.95. The maximum response was obtained at an urea to fatty acid ratio of 2.99:1 and a crystallization time of 23.64 h and predicted response of 90.44%. Analysis of variance showed that the urea to fatty acid ratio and crystallization time affected the response. Verification under optimal conditions showed that the purity of &omega-3 fatty acids was 89.64% and the enrichment was 2.85 fold. Verification result revealed that the predicted value from this model was reasonably close to the experimentally observed value. The urea crystallization process changed oil quality parameters including oxidation level (peroxide, anisidin, and totox values, Fe, Cu and P concentrations and moisture content and this were mostly due to the saponification process before urea crystallization.

  15. Caracterización de pacientes con necesidades de prótesis bucomaxilofacial en el municipio de Las Tunas

    Directory of Open Access Journals (Sweden)

    Neiva de la Caridad Nápoles Rodríguez

    2014-08-01

    Full Text Available Se realizó un estudio descriptivo de corte transversal en las áreas de salud correspondientes al municipio de Las Tunas, provincia del mismo nombre, desde mayo de 2010 a mayo de 2011; con el objetivo de caracterizar clínico-epidemiológicamente a los pacientes con necesidades de prótesis bucomaxilofacial. El universo fue de 189 303 habitantes de las áreas de salud en estudio, la muestra incluyó 131 pacientes con defectos bucomaxilofaciales, se les aplicó una encuesta según el instructivo metodológico de carácter nacional establecido. La tasa general de prevalencia fue de 6,92 x 10 000 habitantes, el grupo de edad con más alto número de pacientes estuvo entre 35 y 59 años de edad (41,2% y predominó el sexo masculino (59,5%. El área craneofacial afectada con más frecuencia fue la ocular (71%, así como, prevaleció el traumatismo (54,2% como causa de estos defectos

  16. Evolutionary origin of the Scombridae (tunas and mackerels: members of a paleogene adaptive radiation with 14 other pelagic fish families.

    Directory of Open Access Journals (Sweden)

    Masaki Miya

    Full Text Available Uncertainties surrounding the evolutionary origin of the epipelagic fish family Scombridae (tunas and mackerels are symptomatic of the difficulties in resolving suprafamilial relationships within Percomorpha, a hyperdiverse teleost radiation that contains approximately 17,000 species placed in 13 ill-defined orders and 269 families. Here we find that scombrids share a common ancestry with 14 families based on (i bioinformatic analyses using partial mitochondrial and nuclear gene sequences from all percomorphs deposited in GenBank (10,733 sequences and (ii subsequent mitogenomic analysis based on 57 species from those targeted 15 families and 67 outgroup taxa. Morphological heterogeneity among these 15 families is so extraordinary that they have been placed in six different perciform suborders. However, members of the 15 families are either coastal or oceanic pelagic in their ecology with diverse modes of life, suggesting that they represent a previously undetected adaptive radiation in the pelagic realm. Time-calibrated phylogenies imply that scombrids originated from a deep-ocean ancestor and began to radiate after the end-Cretaceous when large predatory epipelagic fishes were selective victims of the Cretaceous-Paleogene mass extinction. We name this clade of open-ocean fishes containing Scombridae "Pelagia" in reference to the common habitat preference that links the 15 families.

  17. Metallomics investigations on potential binding partners of methylmercury in tuna fish muscle tissue using complementary mass spectrometric techniques.

    Science.gov (United States)

    Kutscher, Daniel J; Sanz-Medel, Alfredo; Bettmer, Jörg

    2012-08-01

    In this study, the binding behaviour of methylmercury (MeHg(+)) towards proteins is investigated. Free sulfhydryl groups in cysteine residues are known to be the most likely binding partners, due to the high affinity of mercury to sulphur. However, detailed knowledge about discrete binding sites in living organisms has been so far scarce. A metallomics approach using different methods like size-exclusion chromatography (SEC) and liquid chromatography (LC) coupled to inductively coupled plasma-mass spectrometry (ICP-MS) as well as complementary mass spectrometric techniques (electrospray ionisation-tandem mass spectrometry, ESI-MS/MS) are combined to sequence and identify possible target proteins or peptides after enzymatic digestion. Potential targets for MeHg(+) in tuna fish muscle tissue are investigated using the certified reference material CRM464 as a model tissue. Different extraction procedures appropriate for the extraction of proteins are evaluated for their efficiency using isotope dilution analysis for the determination of total Hg in the extracts. Due to the high chemical stability of the mercury-sulphur bond, the bioconjugate can be quantitatively extracted with a combination of tris(hydroxymethyl)aminomethane (TRIS) and sodium dodecyl sulphate (SDS). Using different separation techniques such as SEC and SDS-polyacrylamide gel electrophoresis (SDS-PAGE) it can be shown that major binding occurs to a high-molecular weight protein (M(w) > 200 kDa). A potential target protein, skeletal muscle myosin heavy chain, could be identified after tryptic digestion and capillary LC-ESI-MS/MS.

  18. Complex coacervation with whey protein isolate and gum arabic for the microencapsulation of omega-3 rich tuna oil.

    Science.gov (United States)

    Eratte, Divya; Wang, Bo; Dowling, Kim; Barrow, Colin J; Adhikari, Benu P

    2014-11-01

    Tuna oil rich in omega-3 fatty acids was microencapsulated in whey protein isolate (WPI)-gum arabic (GA) complex coacervates, and subsequently dried using spray and freeze drying to produce solid microcapsules. The oxidative stability, oil microencapsulation efficiency, surface oil and morphology of these solid microcapsules were determined. The complex coacervation process between WPI and GA was optimised in terms of pH, and WPI-to-GA ratio, using zeta potential, turbidity, and morphology of the microcapsules. The optimum pH and WPI-to-GA ratio for complex coacervation was found to be 3.75 and 3 : 1, respectively. The spray dried solid microcapsules had better stability against oxidation, higher oil microencapsulation efficiency and lower surface oil content compared to the freeze dried microcapsules. The surface of the spray dried microcapsules did not show microscopic pores while the surface of the freeze dried microcapsules was more porous. This study suggests that solid microcapsules of omega-3 rich oils can be produced using WPI-GA complex coacervates followed by spray drying and these microcapsules can be quite stable against oxidation. These microcapsules can have many potential applications in the functional food and nutraceuticals industry.

  19. Efectividad de la acupuntura en el tratamiento del síndrome del túnel del carpo, Las Tunas

    Directory of Open Access Journals (Sweden)

    Aydelián Jevey González

    2014-08-01

    Full Text Available Se realizó un estudio de intervención con el objetivo de determinar la efectividad de la acupuntura en el tratamiento del Síndrome del Túnel del Carpo, en pacientes que fueron atendidos en el Policlínico Docente Manuel Piti Fajardo del municipio de Las Tunas, en el período comprendido desde enero hasta diciembre de 2008. La muestra la conformaron 50 pacientes mayores de 14 años. Se les aplicó un tratamiento con acupuntura diario en un total de quince sesiones, utilizando los puntos: IG-4, IG-11, ID-3, P-7 y TR-5, conjuntamente con la terapia medicamentosa. Los resultados fueron satisfactorios, la casi totalidad de los pacientes (49 tuvo una evolución clínica positiva, al disminuir los síntomas y signos. Las recaídas fueron mínimas luego de treinta días de aplicado el tratamiento, el consumo de medicamentos disminuyó de forma discreta y los efectos adversos al tratamiento acupuntural fueron mínimos. El tratamiento fue efectivo

  20. Metazoan parasites in the head region of the bullet tuna Auxis rochei (Osteichthyes: Scombridae) from the western Mediterranean Sea.

    Science.gov (United States)

    Mele, S; Saber, S; Gómez-Vives, M J; Garippa, G; Alemany, F; Macías, D; Merella, P

    2015-11-01

    The head region of 72 bullet tuna Auxis rochei from the western Mediterranean Sea (south-east Spain and the Strait of Gibraltar) was examined for parasites. Seven metazoan species were found in the fish from south-east Spain: three monogeneans, two trematodes and two copepods, whereas only three species were isolated in the fish from the Strait of Gibraltar. A comparison of the levels of infection of the parasites according to fish size in south-east Spain showed that the prevalence of Didymozoon auxis and the mean abundance of Allopseudaxine macrova were higher in the larger hosts (range of fork length = 38-44 cm) than in the smaller ones (33-37 cm). A comparison of the parasite infections according to geographical region showed that the mean abundances of Nematobothriinae gen. sp. and Caligus bonito were higher in fish from south-east Spain than in those from the Strait of Gibraltar. A comparison of the parasite fauna of A. rochei from the Mediterranean Sea with the published data on Auxis spp. from the Atlantic, Indian and Pacific Oceans revealed the closest similarity between the Mediterranean A. rochei and the Atlantic A. thazard.

  1. El papel de la universidad publica en la solución a problemáticas locales: experiencia con productores de nopal y tuna en la Junta Auxiliar de San Sebastián Villanueva, Puebla, México

    OpenAIRE

    Sánchez Espíndola, Adriana; Bernal Mendoza, Héctor

    2015-01-01

    Partiendo de un diagnóstico con enfoque territorial, se identificó la problemática que condicionan la producción de nopal y tuna (Opuntia Ficus-indica (L.) Mill) de los productores de la “Agrointegradora de nopal y tuna S.A. de C.V.” aplicando técnicas participativas. Se determinaron dos problemáticas regionales: 1) Empleo indiscriminado e inadecuado de plaguicidas, con posible aparición de plagas nuevas y generación de resistencia y las consecuentes pérdidas económicas, y 2) Uso exclusivo de...

  2. Impact of fish aggregation devices on tropical tuna' s behavioral pattern: A review%人工集鱼装置对热带金枪鱼类行为模式的影响

    Institute of Scientific and Technical Information of China (English)

    王学昉; 朱国平; 孙满昌; 许柳雄

    2012-01-01

    金枪鱼类会聚集在漂浮物周围,人类依据该行为特性研制出人工集鱼装置(fish aggregation devices,FADs)诱集金枪鱼,从而使金枪鱼围网的产量和捕捞效率大幅提高.但目前科学界仍不确定FADs为何能够吸引金枪鱼以及其广泛使用是否会对金枪鱼资源和大洋中上层生态系统产生潜在影响.针对这些问题,国外学者展开了大量以FADs周围金枪鱼为研究对象的个体行为学试验.本文归纳并整理了过去30多年中较可靠和经典的相关试验,从金枪鱼的趋向性行为、集群行为、随附行为、摄食行为和垂直移动行为5个方面分别阐述了漂流FADs和锚泊FADs下金枪鱼的行为模式,并对国内今后开展相关研究的重点方向和注意事项进行了展望.%Tuna prefers to aggregate around floating objects. Based on this behavioral characteristic , people developed fish aggregation devices (FADs) to trap tuna, and made the catch and fishing efficiency of tuna purse seine fisheries improved greatly. However, there still exist uncertainties whether the FADs can attract tuna and what' s the potential impact of widely applying FADs in tuna purse seine fishery on tuna resources and oceanic pelagic ecosystem. Aiming at these uncertainties, scientists conducted a great deal experiments to study the behavioral biology of tuna around FADs. This paper reviewed the related classic and more credible experiments in the past 30 years, and summed up five behavioral patterns of the tunas around drifting and anchored FADs, i. e. , tropism behavior, schooling behavior, association behavior, feeding behavior, and vertical movement pattern. The related main research methods currently in use were introduced, and the issues on this subject needed to be paid great attention to were discussed.

  3. Influence of Amino Acid Compositions and Peptide Profiles on Antioxidant Capacities of Two Protein Hydrolysates from Skipjack Tuna (Katsuwonus pelamis Dark Muscle

    Directory of Open Access Journals (Sweden)

    Chang-Feng Chi

    2015-04-01

    Full Text Available Influence of amino acid compositions and peptide profiles on antioxidant capacities of two protein hydrolysates from skipjack tuna (Katsuwonus pelamis dark muscle was investigated. Dark muscles from skipjack tuna were hydrolyzed using five separate proteases, including pepsin, trypsin, Neutrase, papain and Alcalase. Two hydrolysates, ATH and NTH, prepared using Alcalase and Neutrase, respectively, showed the strongest antioxidant capacities and were further fractionated using ultrafiltration and gel filtration chromatography. Two fractions, Fr.A3 and Fr.B2, isolated from ATH and NTH, respectively, showed strong radical scavenging activities toward 2,2-diphenyl-1-picrylhydrazyl radicals (EC50 1.08% ± 0.08% and 0.98% ± 0.07%, hydroxyl radicals (EC50 0.22% ± 0.03% and 0.48% ± 0.05%, and superoxide anion radicals (EC50 1.31% ± 0.11% and 1.56% ± 1.03% and effectively inhibited lipid peroxidation. Eighteen peptides from Fr.A3 and 13 peptides from Fr.B2 were isolated by reversed-phase high performance liquid chromatography, and their amino acid sequences were determined. The elevated antioxidant activity of Fr.A3 might be due to its high content of hydrophobic and aromatic amino acid residues (181.1 and 469.9 residues/1000 residues, respectively, small molecular sizes (3–6 peptides, low molecular weights (524.78 kDa, and amino acid sequences (antioxidant score 6.11. This study confirmed that a smaller molecular size, the presence of hydrophobic and aromatic amino acid residues, and the amino acid sequences were the key factors that determined the antioxidant activities of the proteins, hydrolysates and peptides. The results also demonstrated that the derived hydrolysates and fractions from skipjack tuna (K. pelamis dark muscles could prevent oxidative reactions and might be useful for food preservation and medicinal purposes.

  4. Review on Detecting Techniques of Histamine of Tuna%金枪鱼组胺检测技术研究进展

    Institute of Scientific and Technical Information of China (English)

    刘书臣; 廖明涛; 林森森; 赵巧灵; 戴志远

    2014-01-01

    Histamine is an nitrogenous organic compound with low molecular weight. Generally , it has potential hazard to human health, and always existed in food, especially in some red meat fish like tuna. Ingesting excessive histamine could cause toxicity to human , and histamine has been one of the standards to judge the meat quality of tuna. The detecting techniques of histamine of tuna were reviewed in this paper , including spectrophotometry, reversed phase high performance liquid chromatography, ion chromatograph, thin layer chromatography, capillary electrophoretic, electrochemical method and colorimetric method, and the prospect of the future development was made.%组胺是一种有潜在危害的含氮低分子量有机化合物,广泛存在于各种食品中,在以金枪鱼为代表的红肉鱼中容易大量产生。摄入过量的组胺会对人体产生危害,组胺已经成为判断金枪鱼质量的标准之一。对近年来金枪鱼肉中组胺的检测技术进行了综述,包括分光光度法、反相高效液相色谱法、离子色谱法、薄层色谱法、毛细管电泳法、电化学法和比色法等,并对检测技术的研究前景进行了展望。

  5. BIOSORCIÓN DE Cd, Pb y Zn POR BIOMASA PRETRATADA DE ALGAS ROJAS, CÁSCARA DE NARANJA Y TUNA

    Directory of Open Access Journals (Sweden)

    Lissette Vizcaíno Mendoza

    2015-01-01

    Full Text Available Debido a su movilidad en los ecosistemas y a su toxicidad para las formas superiores de vida,los metales pesados Cd, Pb y Zn son priorizados como unos de los contaminantes inorgánicosmás importantes debido al alto riesgo que representan para el medio ambiente. Con el objeto dedisminuir su concentración se diseñó un sistema para evaluar su remoción empleando biomasade algas rojas, cáscaras de naranja (Citrus sp. y tuna guajira (Opuntia sp.. Se estudió la influenciadel pretratamiento y el empaquetamiento mediante ensayos tipo batch, en los que se emplearonsoluciones de sodio y calcio. Se obtuvo como resultado una mayor capacidad de sorción de lasalgas modificadas con NaOH 0.1 N y de la naranja y la tuna con modificación sucesiva con NaOH yCaCl20.2 M, y una afección poco significativa (≤1% del proceso de sorción al empacar la biomasael placas planas de tul poliéster. La eficiencia de remoción se determinó mediante un reactor deflujo continuo de columna fija con un volumen líquido de 400 mL, 75 g de biomasa y tiemposde retención promedio de 1 y 2 h. Los resultados mostraron una eficiencia similar de las tresbiomasas para remover Cd y Pb, con promedios superiores al 95%, mientras que el Zn se removiócon mejor eficiencia (62% al emplear tuna modificada como sorbente. Finalmente, el materialse calcinó a 700 °C con lo que se obtuvo una ceniza estable frente a soluciones ácidas, lo cualgarantiza la captura de los metales removidos.

  6. Evaluación sensorial, adaptación, adaptación y aceptación del fruto de tuna

    OpenAIRE

    Acha, Evangelina

    2010-01-01

    La presente investigación procura indagar acerca de un alimento poco conocido en la dieta habitual de los argentinos y que sin embargo brinda beneficios nutricionales muy variados. El objetivo general consiste en evaluar el grado de aceptación y de adaptabilidad de la tuna, sin alterar las características organolépticas del mismo, siendo estas, color, sabor, aroma, textura y volumen. Como objetivos específicos, se plantean identificar el grado de información con el que...

  7. Measurement and analysis of sinking characteristics of tuna purse seine%金枪鱼围网沉降特性

    Institute of Scientific and Technical Information of China (English)

    许柳雄; 王敏法; 叶旭昌; 兰光查

    2011-01-01

    根据沿围网下纲缚扎的10只温度深度计(TDR-2050型)自动记录的23网次有效数据,对中国中西太平洋金枪鱼围网的下纲沉降速度、沉降深度及其与时间的关系进行了研究.结果表明:(1)网具未达到理论沉降深度,网具中部平均沉降深度为160m,为最大拉紧高度(311.1 m)的51.4%;(2)网具中部沉降深度与时间的关系为h=- 0.000 2t2+ 0.3663 t;(3)网具各部位的沉降速度不同,取鱼部最慢,网具中部次之,后网头最快;(4)下纲各部位沉降速度均随着深度的增加而减小,沉降速度波动幅度随深度增加按“大—小—大”的规则变化;(5)网具中部沉降速度与时间的关系为:v=3×10-7t2-7×10-4t+0.418 9.本研究结果可为改善金枪鱼围网沉降性能提供基础数据,并为海上生产提供指导性参考.%We quantified the sinking depth and sinking speed of tuna purse seines. We attached a micro-temperature and depth recorder (10 TDR-2050) to a purse seine on the "JINHUI NO.6" vessel (Shanghai Pelagic Fishing Company) and collected data from 23 sets in the Western and Central Pacific Ocean (WCPO) between October and December 2006. The sinking depth did not achieve the theoretical maximum sinking depth, instead accounting for 51.4% of the maximum stretched height (311.1m) of the netting. The relationship between the sinking depth (h) and time (t) for the mid section of leadline can be described using the formula: h = -0.000 2 t2+ 0.366 3 t (R2=0.998 3). The sinking speed differed among the sections of the lead line. The fastest sinking speed was recorded at the back wing end, followed by the mid section and the bulk. The sinking speed decreased with depth, the deeper the sinking depth of leadline, the lower the sinking speed. Fluctuations in the confidence interval of the average sinking speed of leadline followed a pattern of large-small-large as the depth increased. The relationship between the sinking speed (v) and time (t) at the

  8. Factores de riesgo para la enteropatía parasitaria en niños del municipio Las Tunas

    Directory of Open Access Journals (Sweden)

    Arley Fajardo Ochoa

    2015-11-01

    Full Text Available Se realizó un estudio analítico de tipo caso control, con el objetivo de determinar los factores de riesgo para la enteropatía parasitaria, como principal causa del síndrome de malabsorción intestinal en niños del municipio de Las Tunas durante el año 2011. El mismo fue realizado en el Hospital Pediátrico Provincial “Mártires de Las Tunas”, con una muestra de 87 pacientes que formaron parte del grupo de estudio, cuyos datos se recolectaron de la consulta médica de gastroenterología en el policlínico de consulta externa de dicha unidad asistencial y 174 en el grupo control, tomados de pacientes que acudieron a la consulta de urología, paralela en tiempo y contigua a la de gastroenterología. A cada grupo se le realizó un interrogatorio y examen físico exhaustivo, que permitió recoger todos los posibles factores de riesgo existentes. Para la determinación de los factores de riesgo se utilizaron los paquetes de programas estadísticos Epinfo versión 6, en el que se realizaron análisis univariados y se evaluó el ODDS RATIO, intervalo de confianza y probabilidad. El procesamiento de los datos se realizó con un 95% de confiabilidad. Los factores de riesgo asociados a la enteropatía parasitaria fueron: pertenecer al sexo masculino, los hábitos higiénicos inadecuados, estado nutricional inadecuado, la ingestión de agua sin hervir y la evacuación de excretas no sanitarias. Se recomienda realizar estudios analíticos para determinar la asociación de otros factores de riesgo, con vistas a establecer programas de intervención en estos pacientes.

  9. Prevalencia de maloclusiones en niños de la escuela Carlos Cuquejo del municipio Puerto Padre, Las Tunas

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    Haideé Tamara Díaz Méndez

    2015-09-01

    Full Text Available Fundamento: en el examen estomatológico correspondiente, realizado a los niños de primero a sexto grado de la escuela primaria Carlos Cuquejo, fue detectado un alto número de niños con maloclusiones de diferentes tipos. Objetivo: describir la prevalencia de las maloclusiones en escolares de 5 a 11 años de edad. Métodos: se realizó un estudio descriptivo, transversal, en el periodo comprendido desde septiembre 2011 a marzo 2012, con todos los escolares que presentaron maloclusión, pertenecientes a la escuela primaria Carlos Cuquejo, del municipio Puerto Padre, provincia Las Tunas. Se analizaron las variables edad, sexo, presencia de hábitos bucales deformantes, tipo de maloclusión y factores de riesgo. Resultados: la prevalencia de maloclusiones fue elevada (44,7 %, siendo el sexo femenino el más afectado (55,3 %. En cuanto a los factores de riesgo, los hábitos deformantes y los elementos hereditarios, fueron los más frecuentes, representando el 64,8 % y el 26,5 %, respectivamente. Otro resultado significativo fue que el 22,8 % de los niños presentó una higiene oral deficiente. Conclusión: se concluye que las maloclusiones afectaron mayormente a las niñas, de edades entre 7 y 9 años, y que se encontraron la vestibuloversión, el apiñamiento, la mordida abierta anterior y las rotaciones dentarias, como tipos principales de maloclusión. Los factores de riesgo más frecuentes fueron los hábitos, la herencia y los traumas.

  10. Comportamiento del síndrome de inmovilización. Hogar de Ancianos, Las Tunas, 2011

    Directory of Open Access Journals (Sweden)

    Mirian Thomas Santiesteban

    2015-11-01

    Full Text Available Se realizó un estudio descriptivo de corte transversal para describir el comportamiento de la inmovilización en el Hogar de Ancianos Carlos Pupo Font, de la provincia de Las Tunas, durante el año 2011. El universo lo constituyeron la totalidad de pacientes institucionalizados y la muestra estuvo conformada por 98 pacientes con algún tipo de inmovilización. Las variables a medir fueron: tipo de inmovilidad, edad, sexo, raza, hábitos tóxicos, estado mental, cambios fisiológicos ocurridos con el envejecimiento, enfermedades frecuentes, complicaciones y factores sociales. La información se obtuvo de la revisión de historias clínicas, fue procesada estadísticamente usando el Microsoft Excel, los resultados se mostraron a través de tablas y gráficos y se compararon con la literatura nacional e internacional. Se obtuvo predominio de pacientes con inmovilización relativa; el grupo de edad más afectado fue de 75 a 84 años, el sexo femenino, la raza blanca y el estado mental correspondiente a los demenciados; el hábito tóxico predominante fue el café; los cambios fisiológicos con el envejecimiento y las enfermedades más frecuentes corresponden a las del aparato músculo esquelético; las complicaciones predominantes fueron las digestivas seguidas por las respiratorias.

  11. Analysis of biogenic carbonates by inductively coupled plasma-mass spectrometry (ICP-MS). Flow injection on-line solid-phase preconcentration for trace element determination in fish otoliths.

    Science.gov (United States)

    Arslan, Z; Paulson, A J

    2002-04-01

    The aragonite deposits within the ear bones (otoliths) of teleost fish retain a chemical signal reflecting the life history of fish (similar to rings of trees) and the nature of fish habitats. Otoliths dissolved in acid solutions contain high concentrations of calcium and a variety of proteins. Elimination of matrix salts and organic interferences during preconcentration is essential for accurate determination of trace elements in otolith solutions by inductively coupled plasma-quadrupole mass spectrometry. An iminodiacetate-based chelating resin (Toyopearl AF-Chelate 650 M) has been used for on-line preconcentration and matrix separation for the determination of 31 transition and rare elements. Successful preconcentration of the elements was achieved at pH 5 by on-line buffering, except Mn which required pH 8.8. Sample solutions were loaded on to the column for 1 min at 3.2 mL min(-1), and then eluted directly into the mass spectrometer with 4% v/v nitric acid. This procedure enabled up to 25-fold preconcentration with successful removal of the calcium matrix. The effect of heat-assisted oxidation with concentrated nitric acid was investigated to eliminate the organic matrix. It was found that heating to dryness after dissolution and further mineralization with the acid significantly improved the retention of the transition elements. The method was validated by analysis of a certified reference material produced from saggittal otoliths of emperor snapper ( Lutjanus sebae), and then applied to the determination of trace metal concentrations in juvenile bluefin tuna ( Thunnus thynnus) from the Western Pacific Ocean.

  12. Analysis of biogenic carbonates by inductively coupled plasma-mass spectrometry (ICP-MS). Flow injection on-line solid-phase preconcentration for trace element determination in fish otoliths

    Energy Technology Data Exchange (ETDEWEB)

    Arslan, Z.; Paulson, A.J. [National Oceanic and Atmospheric Administration (NOAA), Northeast Fisheries Science Center (NFSC), James J. Howard Marine Sciences Laboratory, Highlands, NJ (United States)

    2002-04-01

    The aragonite deposits within the ear bones (otoliths) of teleost fish retain a chemical signal reflecting the life history of fish (similar to rings of trees) and the nature of fish habitats. Otoliths dissolved in acid solutions contain high concentrations of calcium and a variety of proteins. Elimination of matrix salts and organic interferences during preconcentration is essential for accurate determination of trace elements in otolith solutions by inductively coupled plasma-quadrupole mass spectrometry. An iminodiacetate-based chelating resin (Toyopearl AF-Chelate 650 M) has been used for on-line preconcentration and matrix separation for the determination of 31 transition and rare elements. Successful preconcentration of the elements was achieved at pH 5 by on-line buffering, except Mn which required pH 8.8. Sample solutions were loaded on to the column for 1 min at 3.2 mL min{sup -1}, and then eluted directly into the mass spectrometer with 4% v/v nitric acid. This procedure enabled up to 25-fold preconcentration with successful removal of the calcium matrix. The effect of heat-assisted oxidation with concentrated nitric acid was investigated to eliminate the organic matrix. It was found that heating to dryness after dissolution and further mineralization with the acid significantly improved the retention of the transition elements. The method was validated by analysis of a certified reference material produced from saggittal otoliths of emperor snapper (Lutjanus sebae), and then applied to the determination of trace metal concentrations in juvenile bluefin tuna (Thunnus thynnus) from the Western Pacific Ocean. (orig.)

  13. THE FORMATION OF THE LOCAL MUSICAL IDENTITY OF THE CITIZEN FROM LAS TUNAS / LA FORMACIÓN DE LA IDENTIDAD MUSICAL LOCAL DEL TUNERO

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    Elemnia Álvarez Merino

    2012-09-01

    Full Text Available The local music identity, part of the system of identity values, encourages contributing to training in the art instructors of the Bachelor of Education Art Instructor specialty. This paper aims to demonstrate how you can promote the teaching and learning of music from the study of the contents of the musical works of the town, musicians, composers, groups of small and large format and repertoire, Web Site by: Music and musicians from Las Tunas, made for this purpose and offers detailed information on major music events occurred in the town of Las Tunas, since the 40's to today where we find also images and sound with processed information form of hypertext, standard format for you to view information, also offers a proposal made by the authors in order to treat this content in the classroom and beyond, to achieve success in social and cultural transformations that allow to transmit their knowledge maintain its historical and cultural identity, improve the quality of their educational work taking into account the technical scientific advances, in the student to the historical and musical knowledge, experiences, experiential and cultural contributions they receive will contribute to the formation of the identity in the process of forming intentional, organized and systematic.

  14. IDENTIFICATION OF OCEANOGRAPHIC PARAMETERS FOR DETERMINING PELAGIC TUNA FISHING GROUND IN THE NORTH PAPUA WATERS USING MULTI-SENSOR SATELLITE DATA

    Directory of Open Access Journals (Sweden)

    VlNCENTIUS SlREGAR

    2006-01-01

    Full Text Available The North Papua waters as one of the important fi shing grounds in the world contribute approximately 75% of world production of pelagic tunas. These fishing grounds are still determined by hunting method. This method is time consuming and costly. However, in many areas determination of fishing ground using satellited data lias been applied by detecting the important oceanographic parameter of the presence of fish schooling such as, sea surface temperature and chlorophyl. Mostly these parameters are used integrat edly. The aim of this study is to assess the important oceanographic parameters detected from mu lti-sensor satellites (NO AA/AVHRR, Seawifs and Topex Poisedon for determining fishing ground of pelagic tunas in the North Papua waters at east season. The parameters include Sea Surface Temperature (STT, chlorophyl-a and currents. The ava ilability of data from optic sensor (Seawifs: chl-a and AVHRR: Thermal is limited by the presence of cloud cover. In that case, Topex Poseidon satellite data can be used to provide the currents data. The integration of data from multi-sensors increases the availability of the oceanographic parameters for prediction of the potential fishing zones in the study area.

  15. Colagenosis con afectación dermatológica en edades pediátricas en Las Tunas, 2010 - 2012

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    Katiuska Tamayo Mariño

    2014-08-01

    Full Text Available El estudio de las enfermedades del colágeno en edades pediátricas es relativamente joven y no se cuenta en Las Tunas con archivos que permitan evaluar su comportamiento, por ello se realizó un estudio descriptivo, transversal y prospectivo en el período comprendido entre los años 2010 al 2012, para caracterizar a los pacientes ingresados con estas enfermedades en el hospital pediátrico Mártires de Las Tunas. Inicialmente se determinaron las conectivopatias diagnosticadas con más frecuencia y luego se estudiaron las variables: sexo, edad, color de la piel, procedencia geográfica y antecedentes patológicos familiares de colagenosis, Los resultados fueron expuestos en tablas y expresados en porcientos. Predominaron la artritis idiopática juvenil, seguido de la fiebre reumática y la morfea. El sexo más frecuente fue el femenino, el grupo de edad más afectado fueron los adolescentes mayores de 13 años, el color de la piel que prevaleció fue el blanco y predominaron los pacientes sin antecedentes patológicos familiares de colagenosis

  16. Mineralización de talco asociada a los cuerpos ultramáficos de la Faja del Río de Las Tunas, Cordillera Frontal de Mendoza

    Directory of Open Access Journals (Sweden)

    Gargiulo, María Florencia

    2011-12-01

    Full Text Available Talc mineralization related to the ultramafic bodies of the Río de Las Tunas belt, Frontal Cordillera of Mendoza province. This contribution shows the main characteristics of the talc mineralization related to the Río de Las Tunas ultramafic bodies in the Salamanca Mining District, Frontal Cordillera of Mendoza province. According to the parageneses defined on the studied samples, three generations of talc were established: 1º crystallized in metaperidotites and related to the prograde stage of the regional metamorphism; 2º crystallized inreaction zones (mostly in the talc zone developed at the boundary between metaperidotites and their country-rocks.These reaction zones evidence a metasomatic process due to geochemical gradient between the ultramafic body and their country-rocks. This process was developed during the retrogression of the regional metamorphic cycle. 3º Talc present in shear-zones that cut across the ultramafic bodies. The extreme serpentinization of the ultramaficbodies is concentrated in shear-zones where the serpentine is subsequently replaced by talc ± carbonates related with a hydrothermal stage. Aqueous fluids relatively enriched in CO2 flowed through these shear-zones causing the cease of serpentine formation favoring the talc and/or carbonates. Mined talc deposits are those in shear zones and reaction zones. They are mostly industrial-, asbestine- or talcschist-type. The talc related to the hydrothermal stage can locally reach first and extra qualities.

  17. Comportamiento de la polifarmacia en el hogar de ancianos “Carlos Font Pupo”, Las Tunas, 2011

    Directory of Open Access Journals (Sweden)

    Sahily de la Caridad Rojas Pérez

    2015-11-01

    Full Text Available El envejecimiento conlleva a un mayor consumo de fármacos en los ancianos, elevando la probabilidad de ocurrencia de interacciones medicamentosas y reacciones adversas, afectando la calidad de vida de este tipo de paciente. Se realizó un estudio descriptivo de corte transversal para caracterizar la polifarmacia en el Hogar de Ancianos “Carlos Pupo Font”, en Las Tunas, durante el año 2011. El universo estuvo constituido por la totalidad de pacientes institucionalizados y la muestra por 102 ancianos con criterio de selección de consumo de tres o más medicamentos de forma simultánea en el período de estudio. Se caracterizó la edad y sexo de los ancianos, frecuencia de polifarmacia, los grupos farmacológicos implicados, las principales afecciones clínicas y las posibles interacciones medicamentosas por las prescripciones realizadas. La información se obtuvo de la revisión de historias clínicas y fue procesada mediante la estadística descriptiva. El sexo femenino y el grupo de edad entre 75 y 84 años fueron los predominantes. Un 47% de los ancianos consumió cuatro medicamentos simultáneamente. Los antihipertensivos fueron los medicamentos más usados, seguidos por los AINEs. El 72% de la muestra padece afecciones cardiorrespiratorias y el 68% afecciones músculo esqueléticas. Se identificaron posibles interacciones medicamentosas relacionadas con el proceso de absorción, dadas por uniones de ácidos y bases débiles y por interacciones con alimentos, específicamente con la leche. La polimedicación puede ser racionalizada a través de un uso adecuado de los medicamentos, teniendo en cuenta el intervalo de dosificación, las características químicas de los fármacos, la dosis y las características individuales del paciente.

  18. Efectividad del tratamiento acupuntural en la Parálisis Facial Periférica. Puerto Padre, Las Tunas

    Directory of Open Access Journals (Sweden)

    Dorania Cera Barea

    2015-11-01

    Full Text Available Se realizó un estudio experimental en pacientes mayores de 19 años, con Parálisis Facial Periférica, que fueron atendidos en el Policlínico "Romárico Oro Peña" del municipio de Puerto Padre, provincia de Las Tunas; en el período comprendido entre enero y diciembre del año 2011. La muestra quedó conformada por 40 pacientes que cumplieron con los criterios de inclusión establecidos, a los que se les aplicó el método acupuntural, con el objetivo de evaluar la efectividad del mismo en el tratamiento de esta enfermedad. Los puntos de acupuntura utilizados fueron: Extra 1, 2, 3; Estómago 2, 4, 6, 7; Vaso Concepción 24; Vaso Gobernador 26 y Vesícula Biliar 14. Se aplicó tonificación en el lado sano y dispersión de la energía en el lado de la parálisis. Se recogió la información a través de micro-historias clínicas, donde se incluyeron todas las variables de manera independiente. Los datos se analizaron a través de la estadística descriptiva y el análisis porcentual. Se concluyó que la enfermedad predominó en el sexo femenino y el grupo etáreo de 40 a 49 años; la exposición al frío y/o al calor resultó el factor desencadenante que más incidió; el mayor número de pacientes presentó una evolución clínica favorable; solo se presentaron dos efectos adversos relativos al uso de la acupuntura, demostrando la inocuidad del tratamiento.

  19. Metasomatismo en ortoanfibolitas de la Faja máfica-ultramáfica del río de las tunas, Mendoza Metasomatism in orthoamphibolites from the Río de Las Tunas mafic-ultramafic belt, Mendoza

    Directory of Open Access Journals (Sweden)

    M. Florencia Gargiulo

    2012-06-01

    Full Text Available Se identificaron claras evidencias petro-mineralógicas y químicas de metasomatismo en ortoanfibolitas de la faja máficaultramáfica del Río de Las Tunas, Cordillera Frontal de Mendoza. Estas ortoanfibolitas integran el basamento metamórfico de la Cordillera Frontal y pertenecen al Complejo Guarguaráz. La peculiaridad que poseen, es el desarrollo de asociaciones de minerales calcosilicáticos vinculados a texturas que indican condiciones de desequilibrio. Los cristaloblastos de anfíbol están reemplazados en los bordes por clinopiroxeno (diópsido ferroso y los individuos de plagioclasa se encuentran casi completamente reemplazados por un agregado muy fino de granate-epidotos.l -prehnita-pumpellyita-albita, que actúa a modo de matriz de la roca. Los cristales de anfíbol y clinopiroxeno están, a su vez, parcialmente reemplazados por pumpellyita y/o clorita, mientras que la matriz se encuentra alterada débilmente por muscovita y calcita. Los cristales de granate corresponden a la serie grosularia-andradita y su composición promedio es Alm05Adr53Prp01Sps04Grs36Uv01. Cristales con mayor contenido de Cr2O3 (11,69-13,17% en peso y sutil zonalidad composicional, determinada por un núcleo más rico en el componente uvarovítico: Alm03Adr13Prp00Sps02Grs35Uv47, y borde con incremento de la proporción del componente grosulárico: Alm03Adr12Prp00Sps01Grs44Uv40, suelen estar en contacto con cristales de magnetita con hasta un 20% de componente cromítico. La zonalidad composicional presente también en los cristales de anfíbol permitió estimar valores de presión entre 2,5 y 4,2 kbar. Las asociaciones minerales junto con sus características texturales y químicas distinguen a estas rocas del resto de las ortoanfibolitas que afloran en el área de estudio y se las interpreta y clasifica como rodingitas clinopiroxénicas con granate y clinozoisita. Las condiciones de presión obtenidas, junto con el desarrollo de los minerales calcosilic

  20. SINTESIS FOSFOLIPID MENGANDUNG ASAM LEMAK w-3 DARI FOSFOLIPID KEDELAI DAN MINYAK KAYA ASAM LEMAK w-3 DARI HASIL SAMPING PENGALENGAN TUNA

    Directory of Open Access Journals (Sweden)

    Teti Estiasih

    2013-03-01

    Full Text Available Synthesis of Phospholipid Containing w-3 Fatty Acids from Soy Phospholipidsand Fish Oil Enriched with w-3 Fatty Acids from Tuna Canning Processing Teti Estiasih, Moch. Nur, Jaya Mahar Maligan, Satrio Maulana ABSTRAK Keunggulan fosfolipid dapat ditingkatkan dengan menggabungkan asam lemak w-3, terutama EPA (eicosapentaenoicacid, C20:5w-3 dan DHA (docosahexaenoic acid, C22:6w-3, pada struktur fosfolipid sehingga diperoleh fosfolipidterstruktur. Strukturisasi fosfolipid kedelai komersial dilakukan dengan cara mengganti asam lemak dari fosfolipidkedelai dengan asam lemak w-3 dari minyak kaya asam lemak w-3 dari hasil samping pengalengan tuna. Sintesisfosfolipid terstruktur dilakukan secara asidolisis enzimatis dengan menggunakan lipase dari R. miehei. Faktor yangdikaji pada proses sintesis ini adalah konsentrasi enzim dan lama sintesis. Tingkat inkorporasi EPA dan DHA padastruktur fosfolipid dipengaruhi oleh konsentrasi enzim. Pada konsentrasi enzim yang rendah, peningkatan lama reaksisetelah tingkat inkoporasi optimum tercapai cenderung menyebabkan penurunan tingkat inkorporasi EPA+DHA. Padakonsentrasi enzim yang tinggi, lama reaksi tampaknya tidak mempengaruhi tingkat inkorporasi. Tingkat inkorporasiDHA lebih tinggi dari EPA sehingga fosfolipid terstruktur yang dihasilkan sangat sesuai digunakan untuk produk panganyang memerlukan kadar DHA tinggi. Ada preferensi inkorporasi EPA+DHA pada fosfatidiletanolamin dibandingkanjenis fosfolipid yang lain.Kata kunci: Fosfolipid terstruktur, asam lemak w-3, EPA, DHA, asidolisis enzimatis ABSTRACT The superiority of soy phospholipids could be obtained by incorporation of w-3 fatty acids into phospholipids structure,especially EPA (eicosapentaenoic acid, C20:5w-3 and DHA docosahexaenoic acid, C22:6w-3. Structurization ofcommercial soy phospholipids was conducted by replacement of natural fatty acids in soy phospholipids by w-3 fattyacids from w-3 fatty acids enriched Þ sh oil from tuna canning processing

  1. Estabilidad química, física y microbiológica de lomo de atún (Thunnus sp. rebanado. Empacado, congelado y almacenado a -20 ºC

    Directory of Open Access Journals (Sweden)

    Romaim De Berardinis

    2012-12-01

    Full Text Available La globalización ha introducido en Venezuela el consumo de pescado crudo, principalmente atún rojo (Thunnus sp. para elaborar sushi y sashimi. Esto ha despertado el interés en conservar el atún fresco, congelado, para disponer de él a lo largo del año con los atributos que definen la calidad del atún fresco. El pescado congelado se empaca para protegerlo del ambiente frío y seco del congelador, evitar su deshidratación y quemaduras en la superficie del tejido muscular que modificarían la apariencia (color, textura, el sabor y el valor nutritivo durante el almacenamiento. El empaque, además debe ofrecer barrera al paso del oxígeno. Los filetes individuales de pescados magros pueden conservarse en almacenamiento congelado 6 meses a -18 ºC y hasta 9 meses a -24 ºC. Con este trabajo se propuso determinar el efecto del la operación de empacado antes y después de la operación de congelación de rebanadas de lomo de atún rojo. Tratamiento 1: empacadas al vacío y congeladas a -20 ºC (V1; control: empacadas a presión atmosférica y congeladas a -20 ºC (C1. Tratamiento 2: congeladas a -20 ºC y empacadas al vacío después (V2; control: congeladas a -20 ºC y empacadas a presión atmosférica después (C2. Para el empacado se recurrió a bolsas multilaminadas (PE/PA/PE, impermeables al O2 del aire, al vapor de agua y con resistencia mecánica a bajas temperaturas. El tratamiento V1 mantuvo la estabilidad química, microbiológica y sensorial de las rebanadas de lomo de atún, a 90 días de almacenamiento a -20 ºC, la cuales fueron más rojas (a, menos amarillas (b y más oscuras (L, con la menor producción de malonaldehído (0,64 mg/kg de todos los tratamientos, y la mayor estabilidad de la fracción de proteínas solubles (10,03 %.

  2. Estabilidad química, física y microbiológica de lomo de atún (Thunnus sp. rebanado. Empacado, congelado y almacenado a -20 ºC

    Directory of Open Access Journals (Sweden)

    Romaim De Berardinis

    2012-01-01

    Full Text Available La globalización ha introducido en Venezuela el consumo de pescado crudo, principalmente atún rojo (Thunnus sp. para elaborar sushi y sashimi. Esto ha despertado el interés en conservar el atún fresco, congelado, para disponer de él a lo largo del año con los atributos que definen la calidad del atún fresco. El pescado congelado se empaca para protegerlo del ambiente frío y seco del congelador, evitar su deshidratación y quemaduras en la superficie del tejido muscular que modificarían la apariencia (color, textura, el sabor y el valor nutritivo durante el almacenamiento. El empaque, además debe ofrecer barrera al paso del oxígeno. Los filetes individuales de pescados magros pueden conservarse en almacenamiento congelado 6 meses a -18 ºC y hasta 9 meses a -24 ºC. Con este trabajo se propuso determinar el efecto del la operación de empacado antes y después de la operación de congelación de rebanadas de lomo de atún rojo. Tratamiento 1: empacadas al vacío y congeladas a -20 ºC (V1; control: empacadas a presión atmosférica y congeladas a -20 ºC (C1. Tratamiento 2: congeladas a -20 ºC y empacadas al vacío después (V2; control: congeladas a -20 ºC y empacadas a presión atmosférica después (C2. Para el empacado se recurrió a bolsas multilaminadas (PE/PA/PE, impermeables al O2 del aire, al vapor de agua y con resistencia mecánica a bajas temperaturas. El tratamiento V1 mantuvo la estabilidad química, microbiológica y sensorial de las rebanadas de lomo de atún, a 90 días de almacenamiento a -20 ºC, la cuales fueron más rojas (a, menos amarillas (b y más oscuras (L, con la menor producción de malonaldehído (0,64 mg/kg de todos los tratamientos, y la mayor estabilidad de la fracción de proteínas solubles (10,03 %.

  3. Mitochondrial genome of the bullet tuna Auxis rochei from Indo-West Pacific collection provides novel genetic information about two subspecies.

    Science.gov (United States)

    Li, Mingming; Guo, Liang; Zhang, Heng; Yang, Sen; Chen, Xinghan; Lin, Haoran; Meng, Zining

    2016-09-01

    Previously morphological studies supported the division of the bullet tuna into the two subspecies, Auxis rochei rochei and A. rochei eudorax. As a cosmopolitan species, A. rochei rochei ranges in the Indo-West Pacific and Atlantic oceans, while A. rochei eudorax inhabits in eastern Pacific region. Here, we used the HiSeq next-generation sequencing technique to determine the mitochondrial genome (mitogenome) of A. rochei from Indo-West Pacific collection, and then compared our data with mitogenomic sequences of the Atlantic and eastern Pacific retrieved from NCBI database. Results showed the mitogenome of A. rochei from three geographic collections shared the same genes and gene order, similar to typical teleosts. Also, we examined a low level of nucleotide diversity among these mitogenomic sequences. Interestingly, nucleotide diversity of intra-subspecies (Atlantic versus Indo-West) was higher than that of inter-subspecies (Atlantic versus eastern Pacific, Indo-West versus eastern Pacific).

  4. Formation of histamine and biogenic amines in cold-smoked tuna: An investigation of psychrotolerant bacteria from samples implicated in cases of histamine fish poisoning

    DEFF Research Database (Denmark)

    Emborg, Jette; Dalgaard, Paw

    2006-01-01

    Two outbreaks and a single case of histamine fish poisoning associated with cold-smoked tuna (CST) were reported in Denmark during 2004. The bacteria most likely responsible for histamine formation in CST implicated in histamine fish poisoning was identified for the first time in this study....... Product characteristics and profiles of biogenic amines in the implicated products were also recorded. In the single poisoning case, psychrotolerant Morganella morganii -like bacteria most likely was responsible for the histamine production in CST with 2.2% ñ 0.6% NaCl in the water phase (WPS......). In outbreak 1, Photobacterium phosphoreum most likely formed the histamine in CST with 1.3% ñ 0.1% WPS. In outbreak 2, which involved 10 persons, the bacteria responsible for histamine formation could not be determined. The measured concentrations of WPS were very low compared with those of randomly collected...

  5. Non-invasive determination of the CO contents in tuna fish using polarization resolved resonance Raman scattering and/or Rayleigh spectroscopy

    DEFF Research Database (Denmark)

    Hassing, Søren

    2016-01-01

    Carbon monoxide (CO) is used for Modified Atmosphere Packaging of fresh fish and meat. CO is added because it binds to the Myoglobin of the muscle tissue with high affinity resulting in a bright, cherry-red colored carboxy-Myoglobin complex. The product will because of the red color appear to be ...... with polarization resolved resonance Raman spectra of these molecules, can form the basis of the development of a fast and non-invasive method for the screening of the presence of CO in tuna fish and meat.......Carbon monoxide (CO) is used for Modified Atmosphere Packaging of fresh fish and meat. CO is added because it binds to the Myoglobin of the muscle tissue with high affinity resulting in a bright, cherry-red colored carboxy-Myoglobin complex. The product will because of the red color appear...

  6. REPOSITORIO DIGITAL PARA UNA MEJOR GESTIÓN DE LA INFORMACIÓN CIENTÍFICA EN LA UNIVERSIDAD LAS TUNAS

    Directory of Open Access Journals (Sweden)

    Yunior Rodríguez Rodríguez

    2015-07-01

    Full Text Available El presente artículo aborda la importancia de la implementación de un repositorio digital para una mejor gestión de la información científica en la Universidad de Las Tunas, donde podamos socializar y consultar las tesis de grado, maestría y doctorado, resultados de proyectos de investigación, libros, revistas, manuscritos creados en nuestra Universidad e incluso digitalizar libros de única edición y de difícil acceso. Se ofrecen definiciones de varios autores así como los antecedentes de la gestión de información científica en nuestra universidad, además de las ventajas de su creación. También se muestra el diagnóstico y la estrategia para si implementación.

  7. One-pot enzymatic synthesis of docosahexaenoic acid-rich triacylglycerols at the sn-1(3) position using by-product from selective hydrolysis of tuna oil.

    Science.gov (United States)

    Nagao, Toshihiro; Watanabe, Yomi; Maruyama, Kazuaki; Momokawa, Yuusuke; Kishimoto, Noriaki; Shimada, Yuji

    2011-01-31

    Docosahexaenoic acid (DHA)-rich oil has been industrially produced by selective hydrolysis of tuna oil with a lipase that acts weakly on DHA. The free fatty acids (FFAs) generated in this process as by-products contain a high DHA concentration (46wt%) but are treated as industrial waste. This study attempted to reuse these by-product FFAs using a one-pot process, and succeeded in producing triacylglycerols (TAGs) through the esterification of the by-product FFAs with glycerol using immobilized Rhizomucor miehei lipase. Regiospecific analysis of the resulting TAGs showed that the content of DHA at the sn-1(3) position (51.7mol%) was higher than the content of DHA at the sn-2 position (17.3mol%). The DHA distribution in TAGs synthesized in this study was similar to the DHA distribution in TAGs from seal oil.

  8. LA GUITARRA DE CONCIERTO COMO EXPRESIÓN DE LA CULTURA EN LAS TUNAS. ESTUDIO DEL PERÍODO 1990- 2014

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    Tatiana Tamayo Talavera

    2015-01-01

    Full Text Available Resumen El presente estudio forma parte de una investigación que se encuentra en proceso, sobre el devenir de la guitarra de concierto en el municipio Las Tunas desde el año 1990 hasta el 2014. La guitarra de concierto se cultiva en este territorio desde la segunda mitad siglo XX, generándose a partir del período citado un proceso de desarrollo paulatino en torno a sus expresiones. Sin embargo, aún no se han logrado niveles masivos de aceptación de la guitarra de concierto por parte de la sociedad tunera, lo cual conduce a realizar un análisis sobre las causas de su situación actual desde la definición de cultura. Por otro lado, quedarán identificadas las deficiencias que en la actualidad limitan sus contribuciones al desarrollo cultural del territorio. ABSTRACT This study is part of a research which is still in process, about the development of the concert guitar in Las Tunas municipality in 1990-2014 period. The concert guitar has been cultivated in this territory since the beginning of XX century, and it has been generated a development process around its expressions in the selected period. However, Las Tunas’ society hasn’t accepted these musical expressions in massive levels, which takes to make an analysis of the causes of its actual situation from culture’s definition. On the other hand, the problems that avoid the contributions of the concert guitar to the culture development of Las Tunas’ territory will be also identified.

  9. Conteo CD4+ y carga viral en la evolución clínica de pacientes con vih-sida en Las Tunas

    Directory of Open Access Journals (Sweden)

    Jenny Hernández Betancourt

    2015-11-01

    Full Text Available La comprensión de la inmunopatogénesis de la infección por vih-sida es un requisito para mejorar racionalmente los tratamientos disponibles y desarrollar inmunoterapias y vacunas. Se estudiaron 314 sujetos con diagnóstico confirmado de esta infección en la provincia de Las Tunas, en el periodo comprendido entre enero de 1986 hasta diciembre de 2011, según los criterios establecidos en el programa cubano para el control de la enfermedad. Se calcularon las frecuencias para las variables: sexo, municipio de residencia, estadio de la enfermedad, progresión clínica, enfermedades coexistentes, conteo de CD4, carga viral y protocolo de tratamiento. El sexo masculino predominó en la muestra de estudio (79,4% y en los progresores rápidos (77,3%. El tiempo medio estimado de progresión a sida fue de 3,6 años. Los pacientes con más de diez años de infectados tuvieron niveles sanguíneos por encima de 500 células CD4+/µL. Los dos esquemas de tratamiento antirretroviral más empleados fueron Zidovudina – Lamivudina – Nevirapina y Estavudina - Lamivudina – Nevirapina, con cifras aceptables para las cifras de linfocitos T CD4+ y la viremia. Más de la cuarta parte de los portadores asintomáticos mantuvieron niveles de células T CD4+ en valores normales, proporción que se reduce a una quinta parte en los enfermos de sida. La muestra estudiada de sujetos infectados por el vih-sida de la provincia de Las Tunas tiene características similares a lo reportado para la epidemia en Cuba.

  10. Características de la infección por geohelmintos intestinales en escolares primarios de la provincia de Las Tunas

    Directory of Open Access Journals (Sweden)

    Rebeca M. Laird Pérez

    2014-08-01

    Full Text Available Se realizó un estudio transversal descriptivo, en el período comprendido entre los meses de septiembre y diciembre de 2004, con el objetivo de caracterizar la infección por geohelmintos intestinales en escolares de la enseñanza primaria de la provincia de Las Tunas. Se estudiaron 1 342 escolares pertenecientes a 35 escuelas de los estratos urbano y rural de los ocho municipios de la provincia. De cada escolar se procesó una muestra de heces por los procedimientos Directo y Kato Katz y se practicó el método de Harada Moris cuando se observaron huevos de ancylostomídeos. A los escolares parasitados por geohelmintos se les determinó su condición clínica. Se obtuvo una prevalencia general de la infección por geohelmintos intestinales del 16,2%, con predominio de la intensidad general de la infección ligera. Los gusanos trichúridos fueron los más observados, asociados a la mayoría de las infecciones con intensidades ligeras y moderadas. Prevaleció el estado clínico asintomático con muy poca morbilidad específica, siendo el dolor abdominal y la diarrea no disentérica los síntomas más frecuentes. Se caracterizó a la provincia de Las Tunas como una zona hipoendémica de geohelmintos intestinales y se recomienda identificar los determinantes de la infección por estos parásitos en la población escolar

  11. Caracterización del mieloma múltiple y de su componente monoclonal durante 14 años en Las Tunas

    Directory of Open Access Journals (Sweden)

    Olga Lina Pupo Rodríguez

    2015-11-01

    Full Text Available El mieloma múltiple es una neoplasia de células plasmáticas que representa el 10% de las enfermedades hematológicas malignas. La mayoría de los pacientes presentan síntomas, signos y trastornos de laboratorio sugestivos de enfermedad activa, incluyendo lesiones osteolíticas activas, hipercalcemia, anemia y fallo renal. Para el diagnóstico de esta enfermedad hay que tener en cuenta las manifestaciones clínicas, los estudios radiológicos, pruebas especiales como citología celular y exámenes de laboratorio como la electroforesis de proteína en suero y orina, inmunoelectroforesis, cuantificación de inmunoglobulinas y proteína de Bence-Jones. Se realizó un estudio con el objetivo de evaluar las características de las variables inmunológicas mediante la determinación de inmunoglobulinas (inmunodifusión radial simple o inmunoturbidimetría en un analizador automático HITACHI, proteínas totales (método de Biuret o en el analizador HITACHI y electroforesis de proteínas en suero y orina en pacientes remitidos de la consulta de Hematología del Hospital “Ernesto Guevara de la Serna” de Las Tunas, con el diagnóstico de mieloma múltiple. La clase IgG fue la predominante en los 127 casos estudiados (73,3%, seguido de la IgA (16,5% y de cadenas ligeras (9,5%. Se han registrado dos casos de macroglobulinemia de Waldeström. En correspondencia con lo reportado en la literatura, en la provincia de Las Tunas el isotipo más frecuente en pacientes afectados por mieloma múltiple es de clase IgG.

  12. Effects of longitudinal body position and swimming speed on mechanical power of deep red muscle from skipjack tuna (Katsuwonus pelamis).

    Science.gov (United States)

    Syme, Douglas A; Shadwick, Robert E

    2002-01-01

    The mechanical power output of deep, red muscle from skipjack tuna (Katsuwonus pelamis) was studied to investigate (i) whether this muscle generates maximum power during cruise swimming, (ii) how the differences in strain experienced by red muscle at different axial body locations affect its performance and (iii) how swimming speed affects muscle work and power output. Red muscle was isolated from approximately mid-way through the deep wedge that lies next to the backbone; anterior (0.44 fork lengths, ANT) and posterior (0.70 fork lengths, POST) samples were studied. Work and power were measured at 25 degrees C using the work loop technique. Stimulus phases and durations and muscle strains (+/- 5.5 % in ANT and +/- 8 % in POST locations) experienced during cruise swimming at different speeds were obtained from previous studies and used during work loop recordings. In addition, stimulus conditions that maximized work were determined. The stimulus durations and phases yielding maximum work decreased with increasing cycle frequency (analogous to tail-beat frequency), were the same at both axial locations and were almost identical to those used by the fish during swimming, indicating that the muscle produces near-maximal work under most conditions in swimming fish. While muscle in the posterior region undergoes larger strain and thus produces more mass-specific power than muscle in the anterior region, when the longitudinal distribution of red muscle mass is considered, the anterior muscles appear to contribute approximately 40% more total power. Mechanical work per length cycle was maximal at a cycle frequency of 2-3 Hz, dropping to near zero at 15 Hz and by 20-50% at 1 Hz. Mechanical power was maximal at a cycle frequency of 5 Hz, dropping to near zero at 15 Hz. These fish typically cruise with tail-beat frequencies of 2.8-5.2 Hz, frequencies at which power from cyclic contractions of deep red muscles was 75-100% maximal. At any given frequency over this range, power

  13. Polychlorinated-Naphthalenes, -Biphenyls, -Dibenzo-p-dioxins, -Dibenzofurans and p,p'-DDE in Bluefin Tuna, Swordfish, Cormorants and Barn Swallows from Italy%意大利的金枪鱼、箭鱼、鸬鹚以及家燕等体内的多氯萘、多氯联苯、多氯二苯-p-二恶英、多氯二苯并呋喃以及p,p'-DDE

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    @@ 我们曾对从意大利收集的金枪鱼、箭鱼、普通鸬鹚以及家燕体内的p,p'-DDE、多氯联苯同类物(PCBs)、多氯二苯-p-二恶英(PCDDs)、多氯二苯并呋喃(PCDFs)以及多氯萘(PCNs)浓度进行过测量.

  14. THE CRAFT LIKE A CULTURAL PRACTICE THAT CONFIGURES SOCIOCULTURAL PROCESSES: THE BASKETWORK IN THE TUNAS AT THE PRESENT TIME / LA ARTESANÍA COMO UNA PRÁCTICA CULTURAL CONFIGURADORA DE PROCESOS SOCIOCULTURALES: LA CESTERÍA EN LAS TUNAS EN LA ACTUALIDAD

    Directory of Open Access Journals (Sweden)

    Yumairys Diamela Candó Gámez

    2012-09-01

    Full Text Available The presence of the handmade movement in The Tunas is an important cultural fact in which has left condensing the conserved information and renovated in the cultural memoirs of the tunero, as long as it is identity that reflective characteristic that distinguish it and very authentic revealing knowledge and specific creation of a societal group. The years ninety represented a stagnation in the popular craft, it altered and it confused the true sense of the handmade production. The market entered as an element of deregulation of the qualities. He fell in the temptation of the commercialization without control. The art is confused with something easy, the legitimate and necessary commercialization of the productions with the marketing of the candongas, the artisan with the worker self-employed, the promoter with the merolico. The institucionalization of the culture starting from the revolutionary victory with the cultural politics's application in Cuba, together to the economic crisis in the decade of the 90 are sociocultural factors that condition to the craft as that it configures of sociocultural processes that are evidenced in the inherited cultural practices or institutionalized, remunerated (professionals or not remunerated (fans, as approaches that it configures of groups. The types of craft, the techniques, the ethnic composition of the representative groups, the professional formation, the origin (field, city, periphery, and composition of the groups for gender and number (grupal or singular they are indicative that allow to conceptualize the characteristics and types of the craft as cultural practice in The Tunas.

  15. Tuna Genetics Mapping

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These samples are collected in order to gain a better understanding of the biological and ecological aspects of this group of fish in this area. It will be used to...

  16. 金枪鱼类渔业管理问题的研究之二:金枪鱼渔业区域性管理组织和其管理新趋势

    Institute of Scientific and Technical Information of China (English)

    乐美龙

    2008-01-01

    金枪鱼渔业区域性管理组织主要有大西洋金枪鱼养护国际委员会(International Commission for the Conservation of Atlantic Tunas-ICCAT),印度洋金枪鱼委员会(Indian Ocean Tuna Commission -IOTC), 中西太平洋渔业委员会(Western and Central Pacific Fisheries Commission -WCPFC),南方蓝鳍金枪鱼养护委员会(Commission for the Conservation of Southern Blue-fin Tuna- CCSBT)等5个。

  17. Fishing ground forecasting of Thunnus alalung in Indian Ocean based on random forest%基于随机森林的印度洋长鳍金枪鱼渔场预报

    Institute of Scientific and Technical Information of China (English)

    陈雪忠; 樊伟; 崔雪森; 周为峰; 唐峰华

    2013-01-01

    To improve the forecasting accuracy of pelagic fishing ground and meet the needs of the practical fishery production, a method of albacore fishing ground forecast model in the Indian Ocean based on random forest was proposed. The Indian Ocean fishery environmental and spatio-temporal data by 5° × 5° grid of every month from 2002 to 2009 were taken as predictor variables and the CPUE(catch per unit effort ,unit : inds per 1 000 hooks)of albacore,classified into high CPUE, moderate CPUE and low CPUE by tertile, was selected as the response variable in the random forest training. The training result indicated that the OOB(out-of-bag)misclassification rate tends to be steady when the number of decision trees reached 100. The random forest obtained through the training was applied to the albacore fishing ground monthly forecast in 2010. The isosurface chart on forecasted probabilities was overlapped on the practical fishery production and a comparison was made between them . The result demonstrated that the high CPUE fishing ground probability distribution and the CPUE of actual fishery ground tally well. Through the ROC analysis, AUCs (Area Under ROC Curve)of high CPUE, moderate CPUE and low CPUE were 0. 847,0. 743 and 0. 803 respectively, indicating that the forecast precision was high. Finally the reason of the relatively low precision of medium CPUE probability in the forecast was analyzed.%为了提高远洋渔场预报水平和满足渔业生产的需要,提出了一种基于随机森林建立印度洋长鳍金枪鱼(Thunnus alalunga)渔场预报模型的方法.选取2002-2009年各个月份印度洋5°×5°格点渔业环境和时空数据(包括海表温度、叶绿素a浓度、表温距平、叶绿素a浓度距平、海表温度梯度强度和海面高度异常等数据)作为预测变量,利用长鳍金枪鱼的CPUE(Catch per unit effort,单位:尾/千钩数)的三分位点将渔区划分为高CPUE、中等CPUE和低CPUE三种类型,作为响应变量,对

  18. Diet of three large pelagic fishes associated with drifting fish aggregating devices (DFADs in the western equatorial Indian Ocean

    Directory of Open Access Journals (Sweden)

    Malone, M. A.

    2011-12-01

    Full Text Available Several species of fish, aggregate around DFADs in marine tropical waters. We captured three predatory species: yellow fin tuna (Thunnus albacares, wahoo (Acanthocybium solandri and dolphinfish (Coryphaena hippurus from aggregations under DFADs in the Western Indian Ocean to characterize their diet and determine whether they fed on other DFAD associated organisms. Yellowfin tuna did not feed on DFAD–associated prey, while wahoo and dolphinfish did exploit resources aggregated by the DFADs, though they predominantly fed on other non–associated organisms. Opportunistic feeding on surface swarming stomatopod crustaceans was observed in yellowfin tuna and dolphinfish associated with FADs, but was not observed in wahoo.

  19. Dinámica de la flota atunera mexicana del Océano Pacífico Oriental Mexican tuna fleet dynamics of the Eastern Pacific Ocean

    Directory of Open Access Journals (Sweden)

    Rafael Solana-Sansores

    2009-12-01

    Full Text Available Se analiza la dinámica de la flota atunera mexicana del Pacífico Oriental y su relación con señales medioambientales utilizadas en las estrategias de pesca. La información proviene de una muestra sistemática con arranque aleatorio de 176 cruceros de pesca registrados por el programa mexicano de observadores, entre 1992 y 2005. En cada viaje la información se genera secuencialmente en lapsos de tiempo fijos, permitiendo suponer que los registros son un proceso estocástico discreto y puede analizarse como una Cadena de Markov. Los registros se agrupan en: (1 desplazamientos espaciales del barco; (2 observación de señales y (3 maniobras de pesca. En el análisis se reconocen dos tácticas de pesca: una sistemática y otra aleatoria. La primera inicia con una búsqueda de señales (aves o mamíferos marinos, seguido de un lance de pesca sobre cardúmenes asociados a delfines o sobre cardúmenes no asociados. Alternativamente, las tácticas aleatorias no involucran una búsqueda y llevan, con menor probabilidad, a un lance sobre atunes no asociados. Ambas tácticas de pesca son influenciados por factores ambientales, ecológicos, sociales, y económicos. De este modo se observan diferentes estrategias durante un ciclo anual o de mayor duración, que están relacionadas con políticas regionales de manejo pesquero derivadas del Acuerdo del Programa Internacional de Conservación de Delfines. Se concluye que la dinámica de la flota atunera mexicana es un factor que deberá analizarse sistemáticamente en la estimación del Esfuerzo de Pesca para obtener mejores evaluaciones de los rendimientos de esta pesquería.It analyzes the fishing dynamics of the Mexican tuna fleet of the Eastern Tropical Pacific (ETP and its relation with environmental signs which are used for fishing. The information comes from a systematic sample with a random start of 176 fishing cruisers, registered by the observer's Mexican program (1992 to 2005. In each trip the

  20. STUDY OF POTENTIAL FISHING GROUND FOR SKIPJACK TUNA (Katsuwonus pelamis in SAWU SEA EAST NUSA TENGGARA PROVINCE USING REMOTE SENSING SATELLITE AND FISHERY DATA

    Directory of Open Access Journals (Sweden)

    IRMA YULIA MADJID

    2015-06-01

    Full Text Available Indonesia's marine waters contain natural resources, especially biological resources, such as fish abundant and diverse. Skipjack tuna is one of the pelagic fish that have a high commercial value and eao be found in the sea water of the eastern part of Indonesia, especially in the sea waler of Kupang, East Nusa Tenggara Province. This study employed the average composite data of Sea Surface Temperature, Chlorophyll-a and Photosyntetically Active Radiation (PAR are got from Aqua MODJS satellite in 2006, and wind speed data from Quickscat satellite. Vertieally Generalized Production Model (VGPM was proposed by Behrenfeld and Falkowski (1997 was used to estimate the Primary Production (PP. The Fish Production was estimated using the formula wa.???? proposed by Pauly and Christensen (1995. Fish Production in-situ data were provided by Ministry of Ma,ine and Fisheries East N\\lsa Tenggara Province in 2006 that was 4,685.75 ton/year. Potential fishing zone for Skipjack Tuna (Katsuwonus pe/amis was divided in Lo Southeast, Transition II, and Northwest monsoon. At Northwest monsoon was low potential fishing ground. The good fishing zone was observed in western part of Sawu Sea. The Estimation of higher fish catching estimated during Southeast and Transition II monsoon. The results of Primary Production (PP showed the same patterns with Chlorophyll-a. The estiination of fish production in Sawu Sea was 6,563.08 ton/year. With comparing between fish production estimation and fish production from Ministry of Marine and Fisheris data showed the utilization rate was 71.39 % in Sawu Sea. The correlation between SST and fish catching was low (-0.25 and the correlation between Chlorophyll-a and fish catching in Sawu Sea was low (0.12. The correlation between Chlorophyll-a and SST in Sawu Sea showed inversely relationships (correlation coefficient of -0.24 and has a different and opposite patterns. The correlation between Primary Production (PP and Chlorophyll

  1. Present and future potential habitat distribution of Carcharhinus falciformis and Canthidermis maculata by-catch species in the tropical tuna purse-seine fishery under climate change

    Directory of Open Access Journals (Sweden)

    Nerea eLezama Ochoa

    2016-03-01

    Full Text Available By-catch species from tropical tuna purse seine fishery have been affected by fishery pressures since the last century; however, the habitat distribution and the climate change impacts on these species are poorly known. With the objective of predicting the potential suitable habitat for a shark (Carcharhinus falciformis and a teleost (Canthidermis maculata in the Indian, Atlantic and Eastern Pacific Oceans, a MaxEnt species distribution model (SDM was developed using data collected by observers in tuna purse seiners. The relative percentage of contribution of some environmental variables (depth, sea surface temperature, salinity and primary production and the potential impact of climate change on species habitat by the end of the century under the A2 scenario (scenario with average concentrations of carbon dioxide of 856 ppm by 2100 were also evaluated. Results showed that by-catch species can be correctly modelled using observed occurrence records and few environmental variables with SDM. Results from projected maps showed that the equatorial band and some coastal upwelling regions were the most suitable areas for both by-catch species in the three oceans in concordance with the main fishing grounds. Sea surface temperature was the most important environmental variable which contributed to explain the habitat distribution of the two species in the three oceans in general. Under climate change scenarios, the largest change in present habitat suitability is observed in the Atlantic Ocean (around 16% of the present habitat suitability area of Carcharhinus falciformis and Canthidermis maculata, respectively whereas the change is less in the Pacific (around 10% and 8% and Indian Oceans (around 3% and 2 %. In some regions such as Somalia, the Atlantic equatorial band or Peru’s coastal upwelling areas, these species could lose potential habitat whereas in the south of the equator in the Indian Ocean, the Benguela System and in the Pacific coast of

  2. An overview of APECOSM, a spatialized mass balanced “Apex Predators ECOSystem Model” to study physiologically structured tuna population dynamics in their ecosystem

    Science.gov (United States)

    Maury, Olivier

    2010-01-01

    This paper gives an overview of the ecosystem model APECOSM (Apex Predators ECOSystem Model) which is developed in the framework of the GLOBEC-CLIOTOP Programme. APECOSM represents the flow of energy through the ecosystem with a size-resolved structure in both space and time. The uptake and use of energy for growth, maintenance and reproduction by the organisms are modelled according to the DEB (dynamic energy budget) theory ( Kooijmann, 2000) and the size-structured nature of predation is explicit. The pelagic community is divided into epipelagic and mesopelagic groups, the latter being subdivided into vertically migrant and non-migrant species. The model is mass-conservative. Energy is provided as the basis of the model through primary production and transferred through 3D spatially explicit size-spectra. Focus species (tunas at present, but any predator species can be considered) are “extracted” from the global size-spectra without losing mass balance and represented with more physiological and behavioural details. The forcing effects of temperature, currents, light, oxygen, primary production and fishing are explicitly taken into account.

  3. Vigilancia inmunoepidemiológica del sarampión, rubéola, parotiditis, poliomielitis y tos ferina en la provincia Las Tunas, 2010-2013

    Directory of Open Access Journals (Sweden)

    Enelis Reyes Reyes

    2014-08-01

    Full Text Available La inmunoepidemiología se ha convertido en imprescindible en el sistema de vigilancia moderno de salud, en la evaluación de los programas de vacunación, en la definición de la inmunidad poblacional y en su papel en la prevención de enfermedades. Este estudio describe el comportamiento en la provincia de Las Tunas de la vigilancia inmunoepidemiológica de cinco enfermedades prevenibles: sarampión, rubéola, parotiditis, poliomielitis y tos ferina. La investigación cubrió el periodo desde el año 2010 hasta el 2013. Los resultados muestran la eficacia de las vacunas empleadas, sin ningún caso positivo registrado y avalan a la vigilancia inmunoepidemiológica establecida desde la atención primaria de salud hasta la red de higiene y epidemiología del municipio, la provincia y la nación. Este sistema es necesario para evaluar con antelación posibles riesgos de enfermedades y la decisión oportuna de medidas de intervención

  4. Aspectos clínicos endoscópicos, relacionados con la diverticulosis de colon. Las Tunas, enero 2011 – diciembre 2012

    Directory of Open Access Journals (Sweden)

    Liem Fonseca Chong

    2015-12-01

    Full Text Available Se realizó un estudio descriptivo de series de casos, en el Hospital “Dr. Ernesto Guevara de la Serna” de Las Tunas, con el objetivo de caracterizar los aspectos clínicos endoscópicos de la diverticulosis del colon, en el periodo comprendido desde enero 2011 a diciembre 2012. El universo quedó constituido por todos los pacientes a los que se les realizó colonoscopia, y la muestra por todos los pacientes con diagnóstico endoscópico de enfermedad diverticular. Para la obtención de los datos primarios se revisaron los expedientes clínicos de 101 pacientes con esta enfermedad, efectuando un cuestionario, en el cual se recogieron, analizaron y tabularon las variables, utilizando como medida de resumen el porcentaje. Se procesaron los datos y se interpretaron los resultados, concluyendo que en el grupo de pacientes estudiados predominaron las mujeres de más de 65 años, con dolor abdominal como síntoma principal y las hemorroides, como enfermedad que más se asoció a esta padecimiento, siendo el colon sigmoides el más afectado.

  5. Caracterización de la trombosis protésica en el servicio de cardiología de Las Tunas. 2006-2011

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    Maikel Santos Medina

    2015-11-01

    Full Text Available Se realizó un estudio descriptivo y transversal en el Servicio de Cardiología del Hospital “Dr. Ernesto Guevara de la Serna” de la provincia de Las Tunas, con el objetivo de caracterizar la trombosis de prótesis valvular en el período entre 2006 y 2011. El universo estuvo conformado por los 34 pacientes ingresados en el servicio por sospecha de trombosis protésica y la muestra por los 29 casos con diagnóstico definitivo de trombosis valvular protésica. Se utilizó la estadística descriptiva a través del análisis porcentual. La edad promedio de los casos fue de 47 años. Predominaron los pacientes del sexo femenino, con prótesis en posición mitral, con anticoagulación inadecuada y con ritmo sinusal en el electrocardiograma al ingreso. El edema agudo del pulmón fue la forma de presentación de disfunción ventricular izquierda que predominó. La mayoría de los pacientes fueron tratados con estreptoquinasa, lográndose resolución de la trombosis en la mayoría de los casos, con un número escaso de complicaciones tras el tratamiento trombolítico.

  6. Propuestas de mejoras energéticas en el área del tándem de un ingenio azucarero de la provincia Las Tunas, Cuba

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    Anislei Santiesteban Velázquez

    2015-01-01

    Full Text Available El presente trabajo se efectuó en ingenio azucarero Antonio Guiteras Holmes, municipio Puerto Padre, provincia Las Tunas en la zafra 2012, con el objetivo de determinar las potencialidades de ahorro de energía eléctrica en el área del tándem, se evalúa el comportamiento de los motores de inducción trifásicos de los molinos en las condiciones actuales de operación con el conocimiento de las mediciones de las magnitudes eléctricas de tensión, corrientes y factor de potencia, con estos elementos mínimos y aplicando el método de los Datos de Placas se obtuvieron sus indicadores energéticos, estos resultados permitieron conocer el factor de carga, la eficiencia, la potencia real de salida de los motores estándares para lograr un uso más racional y eficiente de la energía en la empresa. Se realiza una propuesta para el redimensionado de estos motores.

  7. Caracterización del claustro de profesores de la carrera de Estomatología en la provincia de Las Tunas

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    Maydelyn Ureña Espinosa

    2015-06-01

    Full Text Available Conocer las características de un claustro contribuye a mejorar su proceso de superación. La caracterización facilita el poder identificar los rasgos personales, profesionales, laborales y otros, que influyen en el trabajo y permiten organizar con calidad la superación, teniendo en cuenta algunos elementos individuales importantes para el mejoramiento pedagógico profesional. El objetivo de este trabajo fue caracterizar el claustro de profesores de la carrera de Estomatología en la provincia de Las Tunas, en el período 2010-2014. Se realizó un estudio descriptivo, en el mencionado claustro, en todas las sedes universitarias de la provincia, en el referido período de estudio. La población de estudio estuvo conformada por los 106 profesores que imparten clases en cualquier asignatura correspondiente a esta especialidad. Se aplicó un instrumento de recogida de datos a la totalidad de los profesores de forma individual. Como resultado se obtuvo que el grupo de edad que predominó fue el de 35 a 44 años y el sexo femenino; en cuanto a la profesión, prevalecen los estomatólogos y los profesores asistentes; el número de doctores en ciencias es insuficiente, así como, las publicaciones y la participación de los docentes en los eventos

  8. KARAKTERISTIK PERIKANAN PANCING TONDA DI LAUT BANDA CHARACTERISTICS TROLL LINE FISHERY IN THE BANDA SEA

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    Thomas Hidayat

    2016-03-01

    Full Text Available Perikanan pancing tonda yang berbasis rumpon di Laut Banda telah lama berkembang. Penelitian ini dilakukan mulai Februari sampai Desember 2011 di Pelabuhan Perikanan Samudera (PPS Kendari yang bertujuan untuk memperoleh data dan informasi tentang laju tangkap, komposisi hasil tangkapan, dan  ukuran ikan yang tertangkap pancing tonda dari Laut Banda. Hasil penelitian menunjukkan bahwa laju tangkap rata-rata pancing tonda di Laut Banda   adalah  3.492 kg/trip dengan lama trip10-12 hari. Komposisi jenis hasil tangkapan pancing tonda di Laut Banda yaitu : cakalang (Katsuwonus pelamis 67 %, madidihang (Thunnus albacares 27 %, tuna mata besar (Thunnus obesus 5 %, lemadang (Coryphaena hippurus 1%. Ukuran ikan cakalang dan madidihang yang tertangkap pancing tonda antara  20-70 cm, sedangkan ukuran keduanya paling banyak  tertangkap antara 40-50 cm. Ikan madidihang yang tertangkap pancing tonda di Laut Banda masih tergolong ikan yang masih muda. Penangkapan juvenil tuna dalam jumlah besar dan terus-menerus dapat menyebabkan sumber daya ikan tuna akan terus menurun di masa mendatang.   Troll line fishery operated around FADs in the Banda Sea has been long developing.  The study was conducted from February to December 2011 in  Kendari Fishing Port aimed to obtain data and information on the catch rate, catch composition and size structure of the fish caught by trolling line in the Banda Sea. The study was conducted by recording catches of troll line fishing boats. The results showed that the average catch rate of  trolling in the Banda Sea is 3,492 kg / trip (10-12 days trip. Catch composition consist of  skipjack tuna (Katsuwonus pelamis 67%, yellowfin tuna (Thunnus albacares, bigeye tuna (Thunnus obesus 5 %, common dolphin fish (Coryphaena hippurus 1%, The length  of skipjack tuna and yellowfin tuna were caught troll line  ranged of 20-70 cm, while the dominant caught with length was 40-50 cm. Yellowfin tuna caught by troll line in the Banda

  9. 金枪鱼鱼柳加工过程中组胺变化规律的研究%Study on histamine change in the processing of tuna loin

    Institute of Scientific and Technical Information of China (English)

    祁兴普; 姚芳; 刘靖; 许可敏

    2011-01-01

    研究了金枪鱼鱼柳加工过程中组胺含量的变化规律.结果表明,在加工过程中,组胺增加主要发生在解冻阶段,解冻至中心温度高于4℃时,鱼肉组胺含量开始急剧增加,原料组胺含量越高,组胺增加速率越大;在蒸煮和静置过程中,组胺含量持续增加,但增幅不大;原料组胺含量对成品鱼柳组胺含量有显著影响,当原料组胺含量为150.7mg/kg时,鱼柳组胺含量增幅可达61.0%.%Regulation of histamine concentration changes in the processing of tuna loin was studied. The results showed that the increase of histamine concentration mainly happened in the thawing stage and raised remarkably when temperature higher than 4C.The higher temperature in raw material generally yielded the greater increasing velocity of histamine. In the process of cooking and quiescence process, histamine concentration continued to increase, but not evident. The histamine concentration of raw tuna had a significant influence on that of tuna loin,when the histamine concentration of raw material was 150.Tmg/kg,the histamine concentration of loin increaseed up to 61.0%.

  10. Los tumores de la mama: hallazgos ecográficos más frecuentes en el policlínico “Gustavo Aldereguía Lima”, Las Tunas

    OpenAIRE

    Yecenia Velasco Diéguez; Juan Ernesto Pérez Reyes; Yamila Urquiola González; José Antonio Navarro Mariño; Andrés Hernández Castillo

    2015-01-01

    Se realizó un estudio descriptivo de corte transversal de pacientes femeninas que presentaron ecografía de mamas con resultado patológico, en el policlínico “Gustavo Aldereguía Lima” de la ciudad de Las Tunas, en el período comprendido de enero a diciembre de 2011. El universo de estudio estuvo conformado por 277 mujeres, a las que se les realizó algún ultrasonido de las mamas, quedando constituida la muestra por 95 pacientes, que presentaron imágenes ultrasonográficas de aspecto sólido. La i...

  11. 金枪鱼碎肉蛋白的酶解工艺研究%Study on Enzymatic Hydrolysis Process of Meat Protein from Tuna Meat

    Institute of Scientific and Technical Information of China (English)

    王芳; 杜帅; 罗红宇

    2013-01-01

    Tuna meat was used as raw material.The DH was regarded as a basis for selecting the proper tool enzyme in the course of selecting compound enzyme.The optimum hydrolysis conditions of pepsin,including the quantity of pepsin,the reaction time,temperature,the pH value,and the substrate concentration(Ratio of fish and water quality),were 800U/g, 3hours,35~40℃,2.0,1∶7.The optimum hydrolysis conditions of flavourzyme were as follows:the quantity of flavourzyme was 52000U/g,2hours,temperature 50~55℃,pH 7.0~7.5.%  采用二步酶解法,以金枪鱼碎肉蛋白为底物,蛋白水解度为指标,分别研究内切酶、端解酶的添加量、酶解时间、酶解温度、酶解pH值对水解度的影响,结果表明:以胃蛋白酶作为第一步水解用酶,胃蛋白酶添加量为800 U/g、酶解时间3 h、温度35~40℃、pH值为2.0、底物浓度(即鱼肉与水质量之比)为1∶7时水解效果最好;风味酶作为第二步水解用酶,添加量为52000 U/g、酶解时间2 h、温度50~55℃、pH值为7~7.5时水解效果最好.

  12. Una propuesta de iniciativas para la producción de agua dulce en la ciudad de Puerto Padre, Las Tunas

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    Juan Ramón Pérez Fajardo

    2012-01-01

    Full Text Available Basado en informes técnicos emitidos por instituciones municipales del territorio de Puerto Padre en la provincia de Las Tunas y en los resultados de entrevistas con representantes de esas propias instituciones y habitantes de la referida localidad, se proponen variantes para la regeneralización de las viejas prácticas de captación de agua dulce a la luz de las actuales circunstancias económicas del país y los avances que ha experimentado la industria de materiales en general, así como adaptar variantes tecnológicas de relativamente bajos costos con iguales propósitos respecto a la disponibilidad de agua, como son los sistemas de desalación de agua de mar con el empleo de energía renovable a escala familiar, tan ampliamente utilizados en regiones de nuestro planeta donde la escasez de agua para el consumo humano impone tonos verdaderamente dramáticos a la existencia misma. Se obtuvo la elaboración de un proyecto que contempla todas estas iniciativas y que ha sido aceptado por las autoridades del gobierno en el territorio y revisado por varios representantes de instituciones académicas y científicas en el país. La ejecución de este proyecto por si solo, no resolverá los problemas de alta contaminación del agua de las fuentes de abasto a la población pero incorporado a nuevas iniciativas constituirá un importante paliativo a la grave problemática que hoy enfrenta ese territorio de grandes potencialidades económicas para el país.

  13. Large-Scale Examination of Spatio-Temporal Patterns of Drifting Fish Aggregating Devices (dFADs from Tropical Tuna Fisheries of the Indian and Atlantic Oceans.

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    Alexandra Maufroy

    Full Text Available Since the 1990s, massive use of drifting Fish Aggregating Devices (dFADs to aggregate tropical tunas has strongly modified global purse-seine fisheries. For the first time, a large data set of GPS positions from buoys deployed by French purse-seiners to monitor dFADs is analysed to provide information on spatio-temporal patterns of dFAD use in the Atlantic and Indian Oceans during 2007-2011. First, we select among four classification methods the model that best separates "at sea" from "on board" buoy positions. A random forest model had the best performance, both in terms of the rate of false "at sea" predictions and the amount of over-segmentation of "at sea" trajectories (i.e., artificial division of trajectories into multiple, shorter pieces due to misclassification. Performance is improved via post-processing removing unrealistically short "at sea" trajectories. Results derived from the selected model enable us to identify the main areas and seasons of dFAD deployment and the spatial extent of their drift. We find that dFADs drift at sea on average for 39.5 days, with time at sea being shorter and distance travelled longer in the Indian than in the Atlantic Ocean. 9.9% of all trajectories end with a beaching event, suggesting that 1,500-2,000 may be lost onshore each year, potentially impacting sensitive habitat areas, such as the coral reefs of the Maldives, the Chagos Archipelago, and the Seychelles.

  14. Aspectos clínicos y endoscópicos del adenocarcinoma gástrico en pacientes de Las Tunas, enero de 2013 a enero de 2014

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    Liem Fonseca Chong

    2014-08-01

    Full Text Available Se realizó un estudio descriptivo de corte transversal, con el objetivo de caracterizar los pacientes atendidos por adenocarcinoma gástrico en el Hospital General Docente “Dr. Ernesto Guevara de la Serna” de provincia de Las Tunas, durante el periodo comprendido entre el 1 de enero de 2013 y el 1 de enero de 2014. El universo quedó constituido por todos los pacientes a los que se les realizó biopsia de estómago, por lesión sospechosa de adenocarcinoma gástrico, y la muestra por todos los pacientes con diagnóstico histológico de esta enfermedad. Para la obtención de los datos primarios se revisaron los expedientes clínicos de 23 pacientes con biopsia positiva. A partir de un cuestionario se recogieron y procesaron los datos y se interpretaron los resultados. Se encontró un predominio en el sexo masculino (69,5%, en los mayores de 51 años (30,4% y en la población de raza negra (47,8% con antecedentes de infección por helicobacter pylori (69,5%. El 43,4% de los pacientes debutó con una dispepsia prolongada, como síntoma predominante, y la imagen endoscópica más observada fue la úlcera cancerosa (12 casos, en relación con el patrón histológico difuso

  15. Caracterización de pacientes pediátricos con labio y paladar fisurados en la provincia de Las Tunas

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    Salvador Javier Santos Medina

    2014-09-01

    Full Text Available Las fisuras labio-palatinas son las malformaciones congénitas craneofaciales más frecuentes. Se realizó un estudio descriptivo, de corte transversal, con el objetivo de caracterizar los pacientes con fisuras de labio y paladar, atendidos en la consulta de cirugía maxilofacial del hospital pediátrico provincial “Mártires de Las Tunas”, en el periodo de septiembre de 2012 a diciembre de 2013. La muestra estuvo conformada por los 26 pacientes en edades pediátricas, atendidos y diagnosticados con la referida entidad. Se seleccionaron como variables a estudiar: grupos de edad, sexo, color de la piel, lugar de procedencia, factores predisponentes, tipo de fisura, asociadas a síndromes, magnitud y número de la fisura. El 26,9% de los pacientes tenían hasta un mes de edad; el 57,7% eran masculinos; el 50,0% del municipio de Las Tunas y el 84,6% de piel blanca. Los factores predisponentes más frecuentes fueron: madres menores de 20 años (57,7% y la herencia (46,2%. Predominaron las fisuras no sindrómicas en el 92,3% de los pacientes; las más frecuentes fueron las fisuras labio-palatinas completas y las palatinas incompletas, con seis de cada una y las unilaterales izquierdas (30,8%. Más de la mitad de los casos comenzaron tratamiento en el primer año de vida

  16. Estimation of the nopal cactus (Opuntia cochenillifera for color removal in drinking water Evaluación de la tuna (Opuntia cochenillifera para la remoción del color en agua potable

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    Joaquín Jiménez Antillón

    2012-12-01

    Full Text Available The efficiency of nopal cactus to remove color in river and artificial waters for human consumption was evaluated. The performance of nopal was compared with that of aluminum sulfate coagulant and a cationic flocculant.The river water was cha- racterized by high color, low turbidity, alkalinity and hardness, and a high percentage of dissolved oxygen. The cactus leaves showed no activity as unique coa- gulant to be evaluated only in river water. In artificial water, as a sole treatment (45 mg/l, an efficiency of 94% in color removal was observed, slightly higher than that of the conventional treatment (20 mg/l Al2 (SO43 and 2 mg/l of cationic flocculant with a removal of 89%. However, water treated with nopal left a residual COD value doubled (21 mg/l compared to con- ventional treatment. In the treatment of artificial water, nopal as a flocculant showed a color removal of 92% and a residual COD of 31.5 mg /l applied at a dose of 22.5 mg/l and 7 mg/l of Al2 (SO43. The nopal was not very effective to remove the color produced by humic substances in waters of low turbidity and alkalinity, but its applicability as a coagulant/flocculant in waters of high turbidity and alkalinity is promising. It is recommended to extract the active ingredients of natural products to reduce the organic load of treated water and prevent the formation of disin- fection byproducts.El estudio evaluó la eficiencia del cactus de la tuna para remover el color en agua de río y agua artificial para el consumo humano. Se comparó su desem- peño con el coagulante sulfato de aluminio y un floculante catiónico. El agua fluvial se caracterizó por presentar alto color, baja turbidez, alcalinidad y dureza y alto porcentaje de oxígeno disuelto. Las hojas de tuna no mostraron actividad como coagulante único al ser evaluadas en agua de río. Se observó una eficiencia de remoción de color del 94% en agua artificial, cuando se aplicó como tratamiento único (45 mg/l, poco

  17. Características de pacientes con cáncer de mama diagnosticado en el año 2013 en el municipio de Las Tunas

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    Enrique Nicolás Milián Mosquera

    2015-06-01

    Full Text Available Fundamento: el cáncer de mama constituye la primera causa de muerte de las mujeres en el mundo. El diagnostico precoz y el tratamiento oportuno de las lesiones mamarias constituyen pilares fundamentales en la evolución y pronóstico de este tipo de cáncer. Objetivo: describir las características clínico-epidemiológicas de las pacientes con cáncer de mama del municipio de Las Tunas, provincia del mismo nombre, Cuba; en el periodo de enero a diciembre de 2013. Métodos: se realizó un estudio observacional-descriptivo y transversal. La población de estudio estuvo constituida por las 59 pacientes que se les diagnosticó cáncer de mama. Se estudiaron los antecedentes patológicos personales, antecedentes patológicos familiares de patología mamaria, menopausia, ingestión de hormonas y otros factores asociados. Se definió el BIRADS (por las siglas en inglés de Breast Imaging reporting and data system mamográfico y se determinó la etapa clínica en que estaban las pacientes cuando se realizó el diagnóstico. Para la recolección de la información fueron utilizados datos estadísticos, historias clínicas individuales, hojas de cargo y resultados de las biopsias y se procesaron por el método estadístico porcentual. Resultados: en la muestra predominó el grupo de edad entre los 50-59 años, los principales factores de riesgo asociados estuvieron relacionados con los antecedentes familiares de haber padecido esta enfermedad, la categoría mamográfica predominante fue la BIRADS IV, y la etapa clínica II. Conclusiones: el mayor por ciento de pacientes se diagnosticó de forma tardía, a pesar de los esfuerzos del sistema nacional de salud para aumentar la pesquisa del cáncer de mama.

  18. Numerical simulation of tuna undulatory swimming%金枪鱼自主波动游动的数值模拟

    Institute of Scientific and Technical Information of China (English)

    徐晓锋; 万德成

    2011-01-01

    The fish swimming is a complex hydrodynamic problem. It contains profound hydrodynamic mechanism and potential application. The tuna undulatory swimming was numerically simulated in this paper. The 3D incompressible Navier-Stokes Equation was solved using the artificial compressibility method. The flow field information around swimming fish and force distribution were obtained through the calculations. With these results, the parametric research and the propelling mechanism were analyzed. It was shown from the results that unsteady Navier-Stokes Equations is able to simulate correctly the flow fields of fish undulatory swimming; the reduced frequency and oscillation amplitude of the fish body can effect on the fish swimming; the reverse Karman vortex street arising from the continuing dissipative vortex ring is the main mechanism of the producing of thrust.%鱼类游动问题蕴含着复杂的流体力学机理,其仿生问题同时又有着重要应用背景.该文运用人工伪压缩方法求解三维不可压缩非定常Navier-Stokes方程,计算分析金枪鱼从静止加速起动到巡游直至减速波动游动的全过程,得到鱼类游动时各状态的流场信息以及受力情况.同时结合计算结果,对鱼类游动过程进行了参数研究并且分析了鱼体推力产生的机理.计算结果分析表明:数值求解非定常Navier-Stokes方程能够模拟鱼体运动时的流场;鱼体摆动频率以及摆幅会影响鱼的游动;持续摆动产生的涡环形成反卡门涡街是鱼体游动时产生推力的重要因素.

  19. Aplicación de la psicoterapia sistémica en la atención primaria de salud. Municipio de Las Tunas

    Directory of Open Access Journals (Sweden)

    Emilio Lastre Arrieta

    2015-11-01

    Full Text Available Se realizó un estudio de intervención con un grupo de pacientes neuróticos en tratamiento ambulatorio, del municipio de Las Tunas, donde se empleó como modalidad terapéutica la Psicoterapia Sistémica de Modificación de Predisposiciones, con el objetivo de modificar las actitudes y los síntomas básicos. En la consulta externa de psiquiatría se seleccionaron a los pacientes que integrarían el grupo de psicoterapia, entre los meses de octubre a diciembre del año 2009, con las características de tener un coeficiente intelectual normal, que no presentaran síntomas obsesivos, ni organicidad cerebral. El grupo de trabajo estuvo formado por psiquiatras, un psicólogo clínico, psicometristas y una enfermera psiquiátrica. A todos los pacientes se les realizó una entrevista, con los objetivos de selección y diagnóstico, se les llenó una encuesta teniendo en cuenta los objetivos propuestos y se les indicaron pruebas psicológicas. El grupo se reunió con una frecuencia semanal, empleando un tiempo de hora y media, durante seis meses, de enero a junio de 2010. Se logró la modificación de los síntomas básicos en los pacientes del estudio con esta forma de psicoterapia, valorando también la modificación de actitudes en relación a las problemáticas fundamentales. Se recomienda el tratamiento en este medio, teniendo en cuenta sus características y lo que se quiere lograr, donde los enfermeros y técnicos de salud tengan un papel activo y que además de la modificación sintomática, se mejore la forma de actuar en la vida ante situaciones de conflicto.

  20. Extraction and Composition Analysis of Fatty Acid from Tuna Emulsion%金枪鱼乳化液中脂肪酸提取及组成分析

    Institute of Scientific and Technical Information of China (English)

    杨小克; 李晓琳; 江晓路; 胡增淼; 李泽瑶; 王鹏

    2012-01-01

    Emulsion is generated during the processing of tuna,and it affects the appearance and flavor of the products seriously.The process parameters affected on the demulsification were studied regarding the demulsification rate as the index.The results showed that the optimum conditions of enzymic hydrolysis is,the amount of animal proteolytic enzyme 400 U/g,hydrolysis time 4 h,hydrolysis pH7.5,the ratio of material to water is 1︰0.5.The total content of saturated fatty acid saturated fatty acid is about 38%,unsaturated fatty acid is about 60%,saturated fatty acid saturated fatty acid saturated fatty acid PUFA is 32.80% in this fatty acid,the content of EPA and DHA is 11.8.32% and 18.46%,respectively.It is yellowish and clarified,with very light fishlike smell,the physical and chemical indexes accord with the first fish oil demand for SC/T 3502-2000 standard.So,it is a kind of potential and functional fatty acid resources.%金枪鱼在加工过程中产生大量乳化液,严重影响产品的外观和风味。以脂肪酸提取率为指标,利用动物蛋白水解酶对乳化液进行处理并对提取脂肪酸的工艺条件进行了研究。结果表明,最佳酶解条件为:加酶量400 U/g,反应时间4 h,pH7.5,固液比1︰0.5。应用气相色谱分析所提脂肪酸的组成,其中饱和脂肪酸含量约为38%,不饱和脂肪酸约为60%。多不饱和脂肪酸(PUFA)的含量达32.80%,其中C20:5(EPA)和C22:6(DHA)的含量分别为8.32%和18.46%。该脂肪酸澄清透明呈淡黄色,略带鱼腥味,各项理化指标均达到SC/T3502-2000标准的鱼油一级要求,是一种潜在的功能性脂肪酸资源。

  1. Seasonal Variation of the Genus Prorocentrum (DINOPHYCEAE in Two Tuna Farms In The Bahía De La Paz, Mexico

    Directory of Open Access Journals (Sweden)

    Rocio Elizabeth MUCIÑO-MÁRQUEZ

    2014-08-01

    Full Text Available The genus Prorocentrum Ehrenberg includes 81 marine species, of which 21 are considered causative agents of harmful algal blooms, and approximately 9 species produce toxins. The objectives of this study were to determine distribution and abundance of Prorocentrum species during an annual cycle at two sampling sites within tuna farms near San Juan de La Costa (SC, Rancheros del Mar (RM and at a station without the influence of these farms located off El Mogote (M, in the Bahia de la Paz, Gulf of California. Samples were taken monthly (June 2006-May 2007 at different depths at SC (0, 25 and 50 m, at the RM (0, 15 and 30 m and at El Mogote (0 m with a van Dorn bottle. The results showed a total of twelve species in the annual cycle: P. compressum, P. dactylus, P. emarginatum, P. gracile, P. lima, P. micans, P. minimum, P. rhathymum, P. rostratum, P. shikokuense, P. triestinum and P. vaginula, of which the first eight are bloomsVARIACIÓN ESTACIONAL DEL GÉNERO Prorocentrum (DINOPHYCEAE EN DOS GRANJAS ATUNERAS EN LA BAHÍA DE LA PAZ, MÉXICOEl género Prorocentrum Ehrenberg, incluye 62 especies marinas, 21 son consideradas formadoras de florecimientos algales nocivos (FAN, de las cuales aproximadamente 10 especies producen toxinas. Considerando lo anterior, el objetivo de este trabajo consistió en determinar la distribución y abundancia de las especies del género Prorocentrum durante un ciclo anual, en dos estaciones de muestreo ubicadas dentro del ámbito de las granjas atuneras y en una estación fuera de la influencia de las granjas en la Bahía de La Paz, B.C.S Las muestras de agua se recolectaron mensualmente (junio 2006-mayo 2007 con una botella van Dorn en diferentes niveles de profundidad. En San Juan de La Costa (SC se recolectaron en superficie 25 y 50 m, en Rancheros del Mar (RM en superficie, 15, y 30 m, y en El Mogote (M solo en superficie. A lo largo del ciclo anual, en las granjas atuneras en la Bahía de La Paz, se registraron

  2. Impacto de la mastoplastia reductiva con técnicas de mínima incisión. Las Tunas, 2008-2010

    Directory of Open Access Journals (Sweden)

    Oliver Alain Dieppa Ramírez

    2015-12-01

    Full Text Available Se realizó un estudio experimental, con el objetivo de evaluar la utilidad de la Mastoplastia reductiva con técnicas de mínima incisión, en el Servicio de Cirugía Plástica del Hospital Provincial Docente “Dr. Ernesto Guevara de la Serna” de la ciudad de Las Tunas; en el periodo comprendido de abril de 2008 a marzo de 2010. El universo estuvo constituido por las 281 pacientes con diagnóstico de hipertrofia mamaria, acompañada o no de ptosis mamaria, y la muestra quedó constituida por las 136 pacientes con diagnóstico de hipertrofia mamaria, grado I, II o III, con criterio quirúrgico estético y/o funcional, las cuales tributaban a la realización de la cirugía con técnicas de mínima incisión durante el período de estudio. Para lograr los objetivos, los datos fueron recogidos de fuentes primarias y secundarias a través del interrogatorio directo, examen físico y de la historia clínica de cada paciente. Todos fueron procesados utilizando la estadística descriptiva mediante el análisis porcentual. Los principales resultados mostraron un predominio del grupo de 23 a 35 años de edad, el tipo de deformidad más operada fue la hipertrofia mamaria moderada, asimismo el tipo de anestesia más usada fue la local. A pesar de ser la dehiscencia de la herida quirúrgica la más frecuente complicación, las operadas se mostraron altamente satisfechas de acuerdo al tamaño, forma, simetría y sensibilidad; siendo la reducción de la cicatriz resultante el parámetro de mayor impacto.

  3. Perfluorooctanesulfonate and related fluorochemicals in several organisms including humans from Italy

    Energy Technology Data Exchange (ETDEWEB)

    Corsolini, S. [Siena Univ. (Italy); Kannan, K. [New York State Univ., Albany, NY (United States)

    2004-09-15

    this study, concentrations of PFOS, FOSA (or PFOSA), PFHxS, and PFOA in marine mammals including bottlenose dolphins (Tursiops truncatus), striped dolphins (Stenella coeruleoalba), common dolphins (Delphinus delphi), fin whales (Balenoptera physalus), long-finned pilot whales (Globicephala melas); in fishes such as northern bluefin tuna (Thunnus thynnus), swordfish (Xiphias gladius); and in common cormorants (Phalacrocorax carbo) collected from Italian coast of the Mediterranean Sea and in blood of the general population from Italy are reported.

  4. ComParison of delay difference model and surPlus Production model aPPlied to albacore(Thunnus alalunga)in the South Atlantic Ocean%时滞差分模型与剩余产量模型的应用比较--以南大西洋长鳍金枪鱼为例

    Institute of Scientific and Technical Information of China (English)

    张魁; 陈作志; 黄梓荣; 许友伟

    2015-01-01

    We applied surplus production model and delay difference model to analyze the data of the southern Atlantic albacore (Thunnus alalunga)stock. Results show that the delay difference model captured annual fluctuation of catch per unit effort(CPUE) better than the Schaefer model. Akaike information criterion(AIC)also reveals that delay difference model performed better. We cal-culated an 80% percentile confidence interval of maximum sustainable yield(MSY)of 21 756 ~ 23 408 t(median 22 490 t)and 26 116 ~ 28 959 t(median 27 520 t)by delay difference model and Schaefer model,respectively. Results of biological reference points show that the southern Atlantic albacore stock was in a good state before 1985 but had been overfished from 1985 to 2005;after that,it was rebuilt gradually but must be taken care of. The delay difference model gave more effective and conservative results than the surplus production model.%将剩余产量模型和时滞差分模型分别应用于南大西洋长鳍金枪鱼(Thunnus alalunga)渔业数据,结果表明,比起剩余产量模型,时滞差分模型拟合的单位捕捞努力渔获量( catch per unit effort,CPUE)曲线能够更好地捕捉到 CPUE 随着时间的波动。赤池信息量准则( Akaike information criterion,AIC)的结果显示,时滞差分模型比Schaefer 模型的评估效果要好。时滞差分模型评估的最大可持续产量( maximum sustainable yield,MSY)中值为22490 t,80%置信区间为21756~23408 t;剩余产量模型评估的 MSY 中值为27520 t,80%的置信区间为26116~28959 t。生物学参考点的结果表明目标群体在1985年以前资源状态较好;1985年~2005年的20年里处于过度捕捞状态;2005年后资源状况得到改善,但仍需加强管理。比起剩余产量模型,时滞差分模型给出了更为有效且保守的评估结果。

  5. 响应面法优化酶解提取金枪鱼鱼油的工艺研究%Optimization of the Enzymatic Extraction of Tuna Oil by Response Surface Methodology

    Institute of Scientific and Technical Information of China (English)

    何键东; 王朋; 胡烨; 罗红宇

    2012-01-01

    [目的]研究蛋白酶提取鱼油的工艺,为鱼油的提取研究提供参考.[方法]利用金枪鱼蒸煮油水混合液为原料,采用胰蛋白酶进行水解,以鱼油提取率为考察指标,采用响应面分析方法研究酶解提取金枪鱼鱼油的最佳工艺条件.[结果]试验得到酶解提取金枪鱼鱼油的最佳工艺条件为:加酶量1.71%、pH 7.94、时间4.22h、温度44℃,在该条件下制备的鱼油提取率达90.23%.经脱胶、脱酸、脱色及脱臭制得的鱼油符合精制鱼油1级标准,其中DHA和EPA含量分别为27.71%和5.94%.[结论]采用胰蛋白酶对金枪鱼蒸煮油水混合液进行水解提取鱼油具有一定的可行性.%[ Objective ] The aim was to study the extraction technology of fish oil by protease, so as to provide references for its study. [ Method] The mixed solution of tuna oil and water was hydrolyzed with trypsin. With the extraction rate offish oil as the investigation target, the response surface methodology was adopted to optimize the extraction technology of tuna oil. [Result] The best extraction conditions were; 1. 71% of trypsin dose, 7.94 of pH, 4. 22 h of extraction time and 44 ? of extraction temperature, under these conditions, the extraction rate offish oil could be up to 90.23% , the degummed, deacidified, decolored and deodorized fish oil met the first-grade standard, its DHA and EPA were 27.71% and 5.94% , respectively. [Conclusion] It is practical to extract the fish oil from the mixed tuna oil and water solution through the hydrolysis of trypsin.

  6. 基于贝叶斯概率的印度洋大眼金枪鱼渔场预报%Fishing ground forecasting of bigeye tuna in the Indian ocean based on bayesian probability model

    Institute of Scientific and Technical Information of China (English)

    周为峰; 樊伟; 崔雪森; 杨胜龙; 伍玉梅

    2012-01-01

    Based on the framework of Bayesian Probability model, historic statistic data of bigeye tuna longline catch in the Indian Ocean from IOTC and optimum interpolation sea surface temperature data from satellite remote sensing from NOAA were used to estimate the model prediction parameters for the Indian Ocean tuna longline fisheries. The validation results of the model showed that the forecasting accuracy of the model for the Indian Ocean bigeye tuna longline fisheries reached 65.96%. The Moderate Resolution Imaging Spectroradiometer (MODIS) SST products were used to do cyclical fishery forecasting in one week cycle and to provide information to support the production of offshore fishing in the Indian Ocean region.%本文采用贝叶斯概率为模型基础框架,利用来自印度洋金枪鱼管理委员会(IOTC)的大眼金枪鱼延绳钓历史渔获统计数据和美国国家海洋大气管理局(NOAA)的海温最优插值再分析数据,进行适用于印度洋金枪鱼延绳钓渔场的模型参数估算与预报模型构建。模型回报精度验证结果表明,印度洋大眼金枪鱼延绳钓渔场综合预报的准确率达到了65.96%。模型预报结果用概率百分比来表示,符合渔业资源分布的客观特点。利用中分辨率成像光谱仪MODIS提供的SST产品进行业务化运行的渔场预报,利用模型结果每周生成印度洋大眼金枪鱼延绳钓渔场概率预报图,用不同大小的圆形来表示渔场概率的高低,可以为印度洋区域的远洋渔业生产提供信息支持。

  7. Improving the Utility of the CATs Video Cam and Tri-axial Accelerometer for Examining Foraging in Top Marine Predators

    Science.gov (United States)

    2015-09-30

    worked perfectly on the humpback whales , 3 on white sharks, 1 on salmon sharks, and 1 on an elephant seal. Additional deployments have resulted in...This will allow researchers to examine video feeds while examining with maximum precision the data sensor information. We will test increased data...six deployments have occurred (3 humpbacks ), (4 white sharks, 1 salmon shark), (1 elephant seal), (2 bluefin tuna). The deployments have progressed

  8. Allowing macroalgae growth forms to emerge: Use of an agent-based model to understand the growth and spread of macroalgae in Florida coral reefs, with emphasis on Halimeda tuna

    Science.gov (United States)

    Yniguez, A.T.; McManus, J.W.; DeAngelis, D.L.

    2008-01-01

    The growth patterns of macroalgae in three-dimensional space can provide important information regarding the environments in which they live, and insights into changes that may occur when those environments change due to anthropogenic and/or natural causes. To decipher these patterns and their attendant mechanisms and influencing factors, a spatially explicit model has been developed. The model SPREAD (SPatially-explicit Reef Algae Dynamics), which incorporates the key morphogenetic characteristics of clonality and morphological plasticity, is used to investigate the influences of light, temperature, nutrients and disturbance on the growth and spatial occupancy of dominant macroalgae in the Florida Reef Tract. The model species, Halimeda and Dictyota spp., are modular organisms, with an 'individual' being made up of repeating structures. These species can also propagate asexually through clonal fragmentation. These traits lead to potentially indefinite growth and plastic morphology that can respond to environmental conditions in various ways. The growth of an individual is modeled as the iteration of discrete macroalgal modules whose dynamics are affected by the light, temperature, and nutrient regimes. Fragmentation is included as a source of asexual reproduction and/or mortality. Model outputs are the same metrics that are obtained in the field, thus allowing for easy comparison. The performance of SPREAD was tested through sensitivity analysis and comparison with independent field data from four study sites in the Florida Reef Tract. Halimeda tuna was selected for initial model comparisons because the relatively untangled growth form permits detailed characterization in the field. Differences in the growth patterns of H. tuna were observed among these reefs. SPREAD was able to closely reproduce these variations, and indicate the potential importance of light and nutrient variations in producing these patterns. ?? 2008 Elsevier B.V.

  9. Metasomatismo en ortoanfibolitas de la Faja máfica-ultramáfica del río de las tunas, Mendoza

    Directory of Open Access Journals (Sweden)

    M. Florencia Gargiulo

    2012-06-01

    Full Text Available Se identificaron claras evidencias petro-mineralógicas y químicas de metasomatismo en ortoanfibolitas de la faja máficaultramáfica del Río de Las Tunas, Cordillera Frontal de Mendoza. Estas ortoanfibolitas integran el basamento metamórfico de la Cordillera Frontal y pertenecen al Complejo Guarguaráz. La peculiaridad que poseen, es el desarrollo de asociaciones de minerales calcosilicáticos vinculados a texturas que indican condiciones de desequilibrio. Los cristaloblastos de anfíbol están reemplazados en los bordes por clinopiroxeno (diópsido ferroso y los individuos de plagioclasa se encuentran casi completamente reemplazados por un agregado muy fino de granate-epidotos.l -prehnita-pumpellyita-albita, que actúa a modo de matriz de la roca. Los cristales de anfíbol y clinopiroxeno están, a su vez, parcialmente reemplazados por pumpellyita y/o clorita, mientras que la matriz se encuentra alterada débilmente por muscovita y calcita. Los cristales de granate corresponden a la serie grosularia-andradita y su composición promedio es Alm05Adr53Prp01Sps04Grs36Uv01. Cristales con mayor contenido de Cr2O3 (11,69-13,17% en peso y sutil zonalidad composicional, determinada por un núcleo más rico en el componente uvarovítico: Alm03Adr13Prp00Sps02Grs35Uv47, y borde con incremento de la proporción del componente grosulárico: Alm03Adr12Prp00Sps01Grs44Uv40, suelen estar en contacto con cristales de magnetita con hasta un 20% de componente cromítico. La zonalidad composicional presente también en los cristales de anfíbol permitió estimar valores de presión entre 2,5 y 4,2 kbar. Las asociaciones minerales junto con sus características texturales y químicas distinguen a estas rocas del resto de las ortoanfibolitas que afloran en el área de estudio y se las interpreta y clasifica como rodingitas clinopiroxénicas con granate y clinozoisita. Las condiciones de presión obtenidas, junto con el desarrollo de los minerales calcosilic

  10. Tuna fishery research in India

    Digital Repository Service at National Institute of Oceanography (India)

    Menezes, M.R.; Kumar, G.; Kunal, S.

    stream_size 3 stream_content_type text/plain stream_name Enviroscan_Newslett_2_7.pdf.txt stream_source_info Enviroscan_Newslett_2_7.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  11. 基于GAM模型研究金枪鱼围网沉降性能影响因素%Impact factors of sinking performance for tuna purse seine based on the generalized additive model

    Institute of Scientific and Technical Information of China (English)

    唐浩; 许柳雄; 周成; 朱国平; 王学昉

    2013-01-01

    Tuna purse seining is the most efficient fishing method in the modern tuna fisheries,and the this present study analyzed the sinking performance in tuna purse seines and its relationships with impact factors,which are beneficial to improve efficient fishing in tuna purse seines.Based on the data collected from the tuna purse seiner "JINHUI 7" operating in the Western and Central Pacific Ocean(WCPO) during September to December 2011,the present study analyzed the relationship between sinking depth (H)and other variables,including shooting duration(T),shooting velocity(V0),length of purse line(L),length of ran line(L1)andcurrent speed(V10,V60 and V120) of 10 m,60 m and 120 m layers,the impact factors on sinking depth are also estimated using the generalized additive model(GAM).The results show that(1) the relationship between the sinking depth (H) and time (t) for the middle section of leadline can be described by the formula H =-0.000 2 t2 +0.408 6 t + 1.809 9 (R2 =0.999 3).(2) the sinking speed decreased with the increasing depth,the relationship between the sinking speed (V) at the middle part of leadline and time (t) can be described using the formula V=2.5 × 10-7 t2-6 × 10-4 t +0.441 2(R2 =0.985 2).(3) the analysis of stepwise GAM shows that four factors have a significant impact on the sinking depth (P < 0.05) and the significance can be ordered by V120,L,T and V60;(4) the analysis of GAM shows that the sinking depth increases gradually with the increasing shooting duration,which concentrates on the period of 500-550 s;current speed has a negative correlation to the sinking depth;the length of purse line is mainly concentrated in about 1 800 m.%金枪鱼围网渔业是现代金枪鱼渔业中捕捞效率最高的方法,研究围网沉降性能与影响因子之间的关系有利于提高围网捕捞效率.利用2011年9-12月金枪鱼围网渔船“金汇7号”在中西太平洋作业时所收集的数据,实验分析了围网沉降深度(H)与

  12. Caracterización y evolución metamórfica de las rocas ultramáficas de la faja del río de las Tunas, Cordillera Frontal de Mendoza Characteristics and metamorphic evolution of the ultramafic rocks from Río de Las Tunas Belt, Frontal Cordillera of Mendoza.

    Directory of Open Access Journals (Sweden)

    M. Florencia Gargiulo

    2011-12-01

    Full Text Available Se presenta el estudio petro-mineralógico y químico de metaperidotitas y serpentinitas de la faja máfica-ultramáfica del río de Las Tunas, Cordillera Frontal de Mendoza. Las metaperidotitas preservan relictos de Ol, Cpx, Spls.l. (castaño-rojizo y escaso Opx con diferentes proporciones modales, que permiten inferir protolitos de dunitas, dunitas espinélicas, dunitas clinopiroxénicas, wehrlitas, clinopiroxenitas olivínicas y clinopiroxenitas. La secuencia de cristalización observada en los minerales de reemplazo de las fases primarias: Srp+Mgt(±Brc±Chl→àTr±Tlc→�}Ath→à±Spls.s./Ple(verde±Opx, evidencia el proceso de serpentinización inicial seguido de aumento del grado metamórfico hasta alcanzar condiciones equivalentes a la transición entre la facies de anfibolita de alto grado y la facies de granulita. Un segundo evento de serpentinización manifestado por texturas pseudomórficas según Amp y Chl y texturas no pseudomórficas y de recristalización, junto con las secuencias a FeChr→àCrMgtà→Mgt y b Spls.s./Ple(verdeà→Mgt, indican condiciones posteriores de bajo grado vinculadas a la etapa retrógrada del ciclo de metamorfismo regional. Durante esta etapa también se desarrollan zonas de reacción entre los cuerpos ultramáficos y su roca de caja, como consecuencia de un proceso metasomático entre las litologías en contacto. De manera relativamente simultánea, se genera también la carbonatización penetrativa de cuerpos ultramáficos cercanos a los niveles carbonáticos del Complejo Guarguaráz. Durante el estadío final del ciclo metamórfico, se emplazan cuerpos ígneos gondwánicos en el área de estudio, que aportan las condiciones físico-químicas que favorecen la movilización de elementos y la concentración de minerales, además de potenciar el desarrollo de los procesos metasomáticos. Un nuevo evento de serpentinización restringido en zonas de cizalla, concentra la alteración extrema y

  13. 金枪鱼肌原纤维蛋白热凝及流变特性的研究%Heating-induced gel and rheological properties of tuna myofibrillar protein

    Institute of Scientific and Technical Information of China (English)

    刘琴; 包海蓉; 奚春蕊; 缪函霖

    2013-01-01

    The gelation characteristics of myofibrillar proteins are indicative of fish product texture. Gaining an additional insight of the gelation mechanism of tuna meat gel system was beneficial for the development of processed tuna products as well as maintaining quality in meat products. The effect of NaCI concentration (0.3~0.6mol/L),on tuna myofibrillar protein gelation and rheological properties were studied using dynamic oscillatory rheometer of both small-amplitude oscillatory shear(SAOS) and large-amplitude oscillatory shear (LAOS). The results showed that during the gel heating-induced process, the G' of myofibrillar protein increased with the increase of NaCI concentration before 47℃. But this general trend changed after 47℃,G' reached a maximum value at NaCI concentration 0.4mol/L. The influence of NaCI was stronger during the period of gel formation. The relationship between its storage modulus and strain within could be described by the logarithmic model. The LAOS tests showed that the higher NaCI concentration would bring closer network structure and larger energy dissipated (Ed) during a sinusoidal stress cycle. The higher NaCI concentration would be able to hold linear viscoelasticity steadily.%鱼肉的组织学特性和肌原纤维蛋白的凝胶学特性有很大的相关性.深入探讨金枪鱼肉肌原纤维凝胶体系的凝胶机理,有利于开发保证质量的金枪鱼肉制品. 本研究通过小振幅及大振幅振荡剪切流变学方法,探讨NaCl浓度(0.3~0.6mol/L)对金枪鱼肌原纤维蛋白热凝胶特性及流变特性的影响.结果表明,热诱导凝胶过程中,在47℃之前,弹性模量(G’)随NaCl浓度的增加而增大,在47℃之后总体趋势发生改变,G’在NaCl浓度为0.4mol/L达到最大值.NaCl浓度在肌原纤维蛋白凝胶形成过程中对流变的影响最大. 对数模型能很好地关联线性粘弹性区间的应变同G’的数量关系. 大振幅振荡测试(LAOS)表明,随着浓度的增

  14. 金枪鱼延绳钓船机电混合动力系统节油效果分析%Analysis of fuel saving effect of tuna longliner electromechanical hybrid power system

    Institute of Scientific and Technical Information of China (English)

    都劲松; 史斌杰; 石浩舰; 黄伟

    2016-01-01

    Tuna longliner fishing is an important part of the pelagic fishery .The process of tuna fishing consists of two completely different working conditions:navigation and operation .The speed is high with the condition of navigation , and the speed is low with the condition of operation .In order to meet the requirenents of the two conditions, the electromechanical hybrid power system through the diesel electric independent operation ( PTH) mode is used .Electromechanical hybrid power system is composed of two parts , which are the diesel engine propulsion system and electric propulsion system .The high power diesel engine model is used when the speed is high , and the small power electric propulsion mode is used when the speed is low .In the past two years, Shanghai Ocean Fishing Company has built five tuna longliners which are equipped with electromechanical hybrid system .According to the real ship test , fuel saving was 25%and 8%with different types in the hooking stage in the operation period , and fuel saving of voyage reached to 14%in the navigation period.Through calculation and analysis , the initial investment cost of using electromechanical power hybrid system throgh the diesel electric independent operation ( PTH) mode could be recovered by way of fuel saving within four years .The fuel saving effects showed that using electric propulsion could save 15%-20% of the fuel compared with the diesel engine propulsion , which could achieve the effects of good energy-saving, emission reduction and cost reduction .%金枪鱼延绳钓渔业是远洋渔业的重要组成部分。金枪鱼延绳钓作业过程包括航行、作业两种完全不同的工况。航行工况时要求航速较高,作业工况时要求航速较低。为了满足这两种工况,采用柴电独立运行( PTH)方式机电混合动力系统。机电混合动力系统由柴油机推进系统与电力推进系统两部分组成。高航速时使用大功率的柴油机模式,低航速

  15. 大西洋金枪鱼延绳钓主要兼捕鱼种垂直分布结构研究%VERTICAL DISTRIBUTION OF BYCATCH SPECIES CAPTURED BY TUNA LONGLINE FISHERY IN THE ATLANTIC OCEAN

    Institute of Scientific and Technical Information of China (English)

    许友伟; 戴小杰; 庄之栋; 朱江峰; 陈彦

    2012-01-01

    研究延绳钓渔获物的垂直分布结构对于评估延绳钓渔业对目标和兼捕种类的影响具有重要的理论和实际参考价值.根据2007-2010年间2个航次调查采集的热带大西洋公海海域(05°N~15°N,29°W~41°W)金枪鱼延绳钓主要兼捕鱼种的渔获资料,估算了14种渔获物的钓获深度,包括金枪鱼类3种、旗鱼类3种、鲨鱼类3种、其它鱼类3种、海龟2种.当钓钩上浮率假设分别为15%、20%和25%时,最小估算深度分别为122、114和107m,最大估算深度分别为311、293和275m.叉尾长鳍乌鲂的平均钓获深度最深,海龟类的平均钓获深度最浅.四分位距图(IQR)显示,各物种的深度分布范围变化很大,有些种类之间的深度分布中值虽然相近,但深度分布范围却相差很大.除剑鱼外,其余兼捕物种与大眼金枪鱼的深度分布均值均有显著性差异.而除剑鱼和红棱鲂外,其余兼捕物种与大眼金枪鱼的深度分布函数均有显著性差异.聚类分析显示14种渔获物可以分成3种垂直分布结构.%Information of vertical distribution of pelagic species has important value for the assessment of impact of longline fisheries on target and bycatch species. Based on capture hook data of pelagic species in two longline scientific observer trips in the high sea of tropical Atlantic Ocean during 2007~2010, we estimated the capture depths of 14 species, including three species of tunas, three species of billfishes, three species of sharks, two species of sea turtles and others. When the constant shoaling factors were 15%, 20% and 25%, the minimum estimated depths were 122,114 and 107m, and the maximum estimated depths were 311,293 and 275m, respectively. The species with the deepest capture depth was bigscale pomfret. The species with the shallowest capture depth was sea turtles. Interquartile range map (IQR) showed the depth distribution of each species varied greatly. Except for sword-fish, the mean

  16. Análisis de plasmas inducidos por láser con excitación multipulso para el proceso de ablación de areolas de Tuna

    Directory of Open Access Journals (Sweden)

    Teresa Flores

    2010-01-01

    Full Text Available Introducción: La técnica de análisis de plasmas inducidos por láser (LIBS, posee importantes ventajas como son que la muestra no requiere preparación previa, puede estar en fase sólida, liquida o gaseosa y tener cualquier forma y dimensión, se requiere una cantidad mínima de material y, finalmente, el análisis se realiza en tiempo real. Estas ventajas, hacen posible el seguimiento en tiempo real de un proceso de ablación láser, incluso para muestras de composición compleja. Para el monitoreo de un proceso industrial, esta herramienta sería más adecuada, si se cuenta con una calibración del equipo y un protocolo particular definido. En el trabajo, se ejemplifica esta posibilidad para el caso de la ablación láser de areolas de Tuna (fruto de el Opuntia ficus-indica. Método: Se realiza el análisis LIBS de muestras de tuna, tanto en las areolas como en la corteza. Para la excitación del plasma se emplea un láser de Nd:YAG en régimen de Q:Switch con tren de pulsos. Con el objeto de asegurar el reconocimiento de las líneas en los espectros LIBS, se realizaron análisis en patrones de composición conocida, estableciéndose un protocolo para la interpretación de los espectros. Resultados: Se logró una clara lectura de la línea de H ubicada en 656.2 nm. Se estableció un protocolo para la interpretación de los espectros, que permitió la identificación de 49 picos característicos. Finalmente, se determina la composición para la corteza y la areola y se lleva a cabo una comparación cualitativa entre éstas. Discusión: Se muestra que la excitación láser en forma de tren de pulsos, entendido este régimen como modalidad particular del Q:Switch, permite la determinación eficiente de elementos, con una adecuada relación señal-ruido. Por otra parte, que es posible determinar diferencias composicionales evidentes entre corteza y la areola, lo cual permite monitorear un proceso de ablación de areolas con láser de manera

  17. Caracterización de pacientes con retinopatía diabética atendidos en el Servicio de Retina del Centro Oftalmológico de Las Tunas

    Directory of Open Access Journals (Sweden)

    Brunilda De Los Ángeles Aveleira Ortiz

    2014-11-01

    Full Text Available Se realizó un estudio descriptivo de corte transversal, en pacientes diabéticos remitidos a consulta de retina del Hospital General Docente “Dr. Ernesto Guevara De La Serna”, en la provincia de Las Tunas, desde febrero 2012 a diciembre 2013, con el objetivo de caracterizar los referidos pacientes. La muestra quedó integrada por 211 diabéticos tipo I y II con retinopatía diabética. Las variables analizadas fueron edad, sexo, agudeza visual, tiempo de evolución de la enfermedad, tipo de retinopatía diabética y tiempo medio de la última consulta oftalmológica. El sexo femenino se presentó en el 54%, la edad comprendida entre 61-70 años fue la más frecuente, con un 26,5%. Como factor atenuante de la retinopatía se destacó el glaucoma de ángulo abierto, con 10,9%, y la miopía, con un 5,6%. El 53% de los pacientes tenían más de 15 años de evolución de la diabetes. La retinopatía diabética no proliferativa severa estuvo en el 27,9%. Se evidenció la entidad en una muestra de pacientes no vistos antes en consulta de oftalmología

  18. Efecto del Almacenamiento a Diferentes Temperaturas sobre la Calidad de Tuna Roja (Opuntia ficus indica (L. Miller Effect of the Storage at Different Temperatures on the Quality of Red Prickle Pear (Opuntia ficus indica (L. Miller

    Directory of Open Access Journals (Sweden)

    Carlos E Ochoa

    2012-01-01

    Full Text Available Se estudia el efecto del almacenamiento a diferentes temperaturas sobre la calidad de tuna roja (Opuntia ficus indica (L. Miller, variedad San Martín. El fruto se almacenó a 4±1, 9±2 y 28±2°C para determinar su vida útil. Se realizó semanalmente la caracterización fisicoquímica, enzimática, antioxidante y microbiológica durante el almacenamiento, hasta observar características no aptas para el consumo. Se observó que el tiempo y la temperatura de almacenamiento son factores que afectan de manera significativa (P0,05 a las diferentes temperaturas de almacenamiento. Sin embargo, la actividad antioxidante presentó un aumento significativo con el tiempo.The effect of the storage at different temperatures on the quality of red prickle pear (Opuntia ficus indica (L. Miller San Martín variety. The fruit was stored at 4±1, 9±2, and 28±2°C for determining its shelf life. Once a week, physicochemical, enzymatic, antioxidant and microbiological characteristics were evaluated until fruit showed no edible characteristics. Time and storage temperature were the two parameters that significantly affected (p0.05 during storage time. However, antioxidant capacity presented a significant increase with time.

  19. Níveis de mercúrio em atum sólido enlatado comercializado na cidade do Rio de Janeiro Total mercury levels in canned tuna fish commercialized at the Rio de Janeiro city, Brazil

    Directory of Open Access Journals (Sweden)

    Allegra YALLOUZ

    2001-01-01

    Full Text Available No presente trabalho, estudou-se o nível de mercúrio em atum sólido enlatado, comercializado na cidade do Rio de Janeiro. Foram analisadas 39 amostras, pertencente a 5 marcas e lotes distintos, utilizando-se a espectrometria de absorção atômica pela técnica de vapor-frio. Os resultados obtidos demonstraram que 53% das amostras apresentaram um teor acima do máximo recomendado, sendo que somente uma entre as cinco marcas estudadas apresentou todas as amostras com níveis dentro dos limites tolerados. Tais resultados demonstram a necessidade de um maior controle da qualidade destes produtos.The present study investigated the mercury levels in canned tuna fish, commercialized in the Rio de Janeiro city, Brazil. Thirty nine samples from five different makers were analyzed by cold vapor atomic absorption spectrometry. The results showed that 53% of the samples presented levels above the WHO (World Health Organization recommended value, and only one from the five suppliers presented all their samples below this level. Such results indicate that it urges a better quality control for this food.

  20. Effects of Tuna oil on Learning and Memory in Senile Mice Induced by D-galactose%金枪鱼鱼油对D-半乳糖致衰老小鼠学习记忆的作用

    Institute of Scientific and Technical Information of China (English)

    王霞; 苏秀榕; 黄健; 李妍妍; 赵凤敏; 曹福生; 王求娟; 陈义方; 夏静波; 徐嘉杰

    2012-01-01

    Objective: To investigate the effects of tuna oil on learning and memory in senile mice induced by D— galactose(Gal). Melhod: 72 mice were divided randomly into six groups: normal control(NC), model control(MC), positive control (PC), low dose(LD), medium dose(MD), high dose(HD). NC with normal saline [ 1 000 mg/(kg·d) ], while the others were treated with D-galactose[1 000 mg/(kg·d)) by subcutaneous injection. NC and MC were given I.g. Normal saline (10 mL/kg bw), LD,MD and HD groups were given I.g 10 mL/kg bw tuna oil respectively 20 mg/mL、 50 mg/mL and 100 mg/mL. PC were treated with piracetam [200 mg/(kg·d) ]. After six weeks, learning and memory ability in mice were evaluated by Morris water maze and Y-maze. Their brains were dissected out after Y-maze experiment for detecting the level of MDA, the activity of SOD and GSH-Px. Results: Compared with MC, the escape latency was obviously shortened, and the ratio of swimming time and distance in platform region in Morris water maze was increased, correct times were increased in Y-maze, time of electronic shock was shortened, the activity of SOD and GSH-Px was increased and the level of MDA was decreased of mice treated with tuna oil at different dose. Moreover, the high—dose group exhibited the similar effects with the piracetam-treated group. Conclusion; Tuna oil can improve learning and memory of senile mice induced by D—galactose.%目的:探讨金枪鱼鱼油对D-半乳糖(Gal)诱导的衰老小鼠学习记忆能力的作用.方法:ICR小鼠72只,随机分为正常对照组(NC),衰老模型组(MC),鱼油低、中、高剂量组(LD、MD、HD)和阳性对照组(PC),每组12只.空白组注射生理盐水[1 000 mg/(kg·d)],其余小鼠皮下注射D-半乳糖[1 000 mg/(kg·d)],正常对照组和衰老模型组每天灌胃10 mL/kg bw蒸馏水,低、中、高剂量组灌胃不同质量浓度10 mL/kg bw的鱼油制剂(20,50,100mg/mL).阳性对照组灌胃脑复康[200 mg/(kg· d)].灌胃6周后,采

  1. Through the stomach of a predator: Regional patterns of forage in the diet of albacore tuna in the California Current System and metrics needed for ecosystem-based management

    Science.gov (United States)

    Glaser, Sarah M.; Waechter, Katrina E.; Bransome, Nicole C.

    2015-06-01

    Foraging habits of predators can reveal patterns in prey ecology and guide ecosystem-based management by informing species interactions. This study describes the diet habits of albacore tuna in three regions (north, central, south) of the California Current System (CCS) and estimates the total predation mortality imposed on twenty prey taxa. The northern CCS was defined by predation on decapods, euphausiids, anchovy and hake. The central CCS was defined by predation on squid, hake and Pacific saury. The southern CCS was defined by predation on anchovy. We estimate North Pacific albacore consumed each year, on average, 54,000 mt of decapods and euphausiids, 43,000 mt of cephalopods, 84,000 mt of juvenile hake, 1600 mt of myctophids, 21,000 mt of juvenile sardine, 10,000 mt of juvenile rockfishes, almost 43,000 mt of Pacific saury, and over 107,000 mt of juvenile anchovy. While variability in predation certainly exists, this and prior studies show that diet habits of albacore are fairly stable through time. The northern CCS appears to be a more significant source of energy for albacore. When designing ecosystem-based approaches to the management of CCS-based fisheries, we recommend that the forage contribution of saury, hake and anchovy to the albacore population be considered.

  2. Shark predation on migrating adult american eels (Anguilla rostrata) in the Gulf of St. Lawrence

    DEFF Research Database (Denmark)

    Béguer-Pon, Mélanie; Benchetrit, José; Castonguay, Martin;

    2012-01-01

    to identify the eel predators, we compared their vertical migratory behavior with those of satellite-tagged porbeagle shark and bluefin tuna, the only endothermic fishes occurring non-marginally in the Gulf of St. Lawrence. We accurately distinguished between tuna and shark by using the behavioral criteria...... generated by comparing the diving behavior of these two species with those of our unknown predators. Depth profile characteristics of most eel predators more closely resembled those of sharks than those of tuna. During the first days following tagging, all eels remained in surface waters and did not exhibit...... itself may contribute to increasing the eel's susceptibility to predation, we discuss evidence suggesting that predation of silver-stage American eels by porbeagle sharks may represent a significant source of mortality inside the Gulf of St. Lawrence and raises the possibility that eels may represent...

  3. Trophic influences on mercury accumulation in top pelagic predators from offshore New England waters of the northwest Atlantic Ocean.

    Science.gov (United States)

    Teffer, Amy K; Staudinger, Michelle D; Taylor, David L; Juanes, Francis

    2014-10-01

    Trophic pathways and size-based bioaccumulation rates of total mercury were evaluated among recreationally caught albacore tuna (Thunnus alalunga), yellowfin tuna (Thunnus albacares), shortfin mako shark (Isurus oxyrinchus), thresher shark (Alopias vulpinus), and dolphinfish (Coryphaena hippurus) from offshore southern New England waters of the northwest Atlantic Ocean between 2008 and 2011. Mercury concentrations were highest in mako (2.65 ± 1.16 ppm) and thresher sharks (0.87 ± 0.71 ppm), and significantly lower in teleosts (albacore, 0.45 ± 0.14 ppm; yellowfin, 0.32 ± 0.09 ppm; dolphinfish, 0.20 ± 0.17 ppm). The relationship between body size and mercury concentration was positive and linear for tunas, and positive and exponential for sharks and dolphinfish. Mercury increased exponentially with δ (15)N values, a proxy for trophic position, across all species. Results demonstrate mercury levels are positively related to size, diet and trophic position in sharks, tunas, and dolphinfish, and the majority of fishes exhibited concentrations greater than the US EPA recommended limit.

  4. 瓦努阿图周边海域长鳍金枪鱼渔场分布及其与表温关系%DISTRIBUTION OF FISHING GROUND OF THUNNUS ALALUNGA AND ITS RELATIONSHIP WITH SEA SURFACE TEMPERATURE IN THE WATERS AROUND VANUATU

    Institute of Scientific and Technical Information of China (English)

    范江涛; 陈新军; 钱卫国; 刘必林

    2011-01-01

    The sea surface temperature (SST) is an important environmental factor affecting fishing ground. According to the catch data from Chinese tuna longlining fleets and SST from satellite remote sensing in the waters around Vanuatu in 2008, the spatial and temporal distribution of albacore tuna and its relationship with SST were carried out. The result shows that the fishing grounds are distributed in the 12°S-14°S and 172°E-175°E, and the suitable SST ranged from 29 to 30℃ during January to April. During May to June, the fishing grounds are located in the waters of 10°S-15°S and 174°E-175°E, and the suitable SST is 28-29 ℃. In July the production was highest in the whole year, the fishing grounds are distributed in the areas of 10°S-15°S, 170°E-175°E and 23°S-24°S, 175°E-177°E, its suitable SST are 27-29 ℃and 23-24 ℃ respectively. During August to September, the monthly fishing grounds are distributed in the areas of 24°S-26°S and 174°E-176°E, 13°S-16°S and 173°E175°E respectively, the monthly suitable SSTs are 21-23 ℃ and 27-28 ℃ respcetively. In October the fishing ground is distributed in the waters of 12°S-17°S, 173°E-176°E and 14°S -15° S, 159°E-161°E, and its suitable SST is 27-29 ℃. During November to December, the monthly fishing grounds are located in the areas of 16°S-19°S and 171°E-174°E, 19°S-22°S and 173°E-175°E, their monthly suitable SSTs are 28-29 ℃. The K-S test indicated that the formation of fishing grounds is closely related with SST.%海表温(SST)是影响渔场的重要环境因子.根据2008年我国冰鲜金枪鱼延绳钓船在瓦努阿图周边海域的生产统计数据,结合卫星遥感获得的SST资料,分析了长鳍金枪鱼各月渔场时空分布及其与SST的关系.K-S检验表明,长鳍金枪鱼渔场形成与SST关系密切.

  5. A comparison of myocardial beta-adrenoreceptor density and ligand binding affinity among selected teleost fishes.

    Science.gov (United States)

    Olsson, H I; Yee, N; Shiels, H A; Brauner, C; Farrell, A P

    2000-11-01

    This study quantified the cell surface beta-adrenoreceptor density and ligand binding affinity in the ventricular tissue of seven teleost species; skipjack tuna (Katsowonus pelamis), yellowfin tuna (Thunnus albacares), Pacific mackerel (Scomber japonicus), mahimahi (dolphin fish; Coryphaena hippurus), sockeye salmon (Oncorhynchus nerka), rainbow trout (Oncorhynchus mykiss) and an Antarctic nototheniid (Trematomus bernacchii). Beta-Adrenoreceptor density varied by almost fourfold among these species, being highest for the athletic fish: sockeye salmon among the salmonids and skipjack tuna among the scombrids. Beta-Adrenoreceptor density was lowest for the Antarctic icefish. Beta-Adrenoreceptor binding affinity varied by almost threefold. We conclude that there is a significant species-specific variability in myocardial beta-adrenoreceptor density and binding affinity and these interspecific differences cannot be attributed to temperature even though intraspecifically cold temperature can stimulate an increase in myocardial beta-adrenoreceptor density. Instead, we suggest that interspecifically myocardial beta-adrenoreceptor density is highest in fish that inhabit tropical water.

  6. Study on Application of HACCP System on Histamine and Microorganism Control of Canned Skipjack Tuna Product for Export%出口金枪鱼罐头中组胺及微生物控制的HACCP应用技术研究

    Institute of Scientific and Technical Information of China (English)

    李微微; 吴祖芳; 周秀锦; 沈飚

    2013-01-01

    以金枪鱼(Skipjack Tuna)罐头生产加工过程为例,分析了生产原料及罐头生产流程各环节物料微生物变化情况,部分工艺参数对细菌总数及组胺产生的影响;确定了原料验收、解冻清洗、预蒸煮和配料封罐为主要关键控制点,并制定HACCP计划,建立相应的监控程序和纠偏措施.经HACCP计划实施前后细菌总数与组胺质量分数对比分析,结果表明解冻阶段细菌数减少约30%,成品细菌总数减少49%,成品中组胺质量分数也从3.5 mg/kg降至1.5 mg/kg,同时提高了水产制品卫生品质及保质期.%The raw materials and microbial changes in different periods of production process of canned marine products were investigated, using Skipjack Tuna production as an example in this paper. The effects of processing factors on the total bacterial population and histamine content were also studied. The crucial control points of entire production process were established including the raw material examination,defrozen cleaning,precooking,ingredients and can sealing. A HACCP plan was established, meanwhile the monitoring program and rectification measures were set up. The total bacterial population and histamine content of tuna in the canning processing were compared by adopting the HACCP plan established. The results showed that the bacterial population reduced about 30% in the phase of defrost by HACCP procedure. It also reduced by 49% for the final product. The histamine content of the final product is also reduced from the 3.5 mg/kg to 1.5 mg/kg. These results demonstrated that the hygiene quality and preservation period of the Skipjack Tuna product have been improved.

  7. Los tumores de la mama: hallazgos ecográficos más frecuentes en el policlínico “Gustavo Aldereguía Lima”, Las Tunas

    Directory of Open Access Journals (Sweden)

    Yecenia Velasco Diéguez

    2015-12-01

    Full Text Available Se realizó un estudio descriptivo de corte transversal de pacientes femeninas que presentaron ecografía de mamas con resultado patológico, en el policlínico “Gustavo Aldereguía Lima” de la ciudad de Las Tunas, en el período comprendido de enero a diciembre de 2011. El universo de estudio estuvo conformado por 277 mujeres, a las que se les realizó algún ultrasonido de las mamas, quedando constituida la muestra por 95 pacientes, que presentaron imágenes ultrasonográficas de aspecto sólido. La información se obtuvo de la revisión del libro de registros de resultados de ultrasonidos, los informes correspondientes y de las historias clínicas de salud individual. Para procesarla se utilizó la estadística descriptiva. Las lesiones benignas se comportaron en su mayoría con baja ecogenicidad, homogéneas y de contornos regulares; las malignas, como imágenes complejas de contornos irregulares. Las histologías más diagnosticadas fueron los tumores benignos y dentro de ellos los fibroadenomas. Se recomendó continuar utilizando la ecografía de las mamas como método efectivo para el estudio de las lesiones tumorales de esta glándula y como complemento de gran valor para diagnosticar precozmente las lesiones malignas de este órgano.

  8. Effects of spatiotemporal and environmental factors on the fishing ground of skipjack tuna (Katsuwonus pelamis) in the Western and Central Pacific Ocean based on generalized additive model%基于GAM模型研究时空及环境因子对中西太平洋鲣鱼渔场的影响

    Institute of Scientific and Technical Information of China (English)

    唐浩; 许柳雄; 陈新军; 朱国平; 周成; 王学昉

    2013-01-01

    基于2000~ 2007年中西太平洋金枪鱼围网生产统计数据及遥感手段获取的海表温度、海面高度、叶绿素浓度等环境数据,利用广义可加模型(GAM)分析了中西太平洋鲣鱼渔场分布及其与时空和环境因子的关系.结果表明:GAM模型对单位捕捞努力量渔获量(CPUE)总偏差解释率为64.40%,其中贡献最大的为经度,贡献率为46.27%.鲣鱼的CPU呈逐年递增状态;作业渔场全年均有分布,但季节性差异并不明显,其中4月为作业集中月份;鲣鱼作业渔场主要分布在10°S~10°N,140°~ 175°E范围内;适宜海表温度为28~ 30℃;适宜的海表面高度为70~100 cm;适宜的叶绿素浓度为0.01~0.20mg/m3.影响渔场的因子按重要性从大到小依次为:经度,纬度,年份,海面高度,海表温度,叶绿素浓度和月份.%Based on the catch data of purse-seine fishery of WCPO from 2000 to 2007 and the environmental data,including sea surface temperature (SST),sea surface height (SSH),chlorophyll a concentration (Chl a) derived from remote sensing,this present study analyzed the fishing ground distribution of skipjack tuna (Katsuwonus pelamis) and its relationships with the spatiotemporal and environmental factors in the Western and Central Pacific Ocean (WCPO) using generalized additive model (GAM).The results show that the rate of deviance explained about CPUE (catch per unit effort) is 64.40%,the factor that provides the largest contribution is longitude and the contribution rate is 46.27%.The CPUE of skipjack tuna is increasing with year.The fishing grounds of skipjack tuna are distributed throughout the year,but the seasonal difference is not significant,the fishing operation is concentrated in April.The fishing ground of skipjack tuna in the WCPO was mainly located in the waters of 10°S ~ 10°N and 140°E ~ 175°E.The suitable SST ranged from 28 ℃ to 30 ℃.The suitable SSH ranged from 70 to 100 cm.The appropriate Chl a range is 0

  9. 金枪鱼肉中组胺菌的分离及其理化性质分析%Isolation of Histamine Forming Bacteria from Tuna Fish and the Analysis of the Physiological and Biochemical Characteristics

    Institute of Scientific and Technical Information of China (English)

    陶志华; 佐藤实

    2009-01-01

    目的:对金枪鱼肉中的组胺生成菌进行生化实验和功能酶检测,进而对鱼肉中组胺菌的存在提供可参考数据.方法:利用组氨酸肉汤培养液,对金枪鱼肉中的组胺生成菌进行筛选,然后通过生物化学实验和形态学实验,进而对组胺生成菌进行分析.结果:分离得到2株组胺菌,菌种Ⅰ在5~C~30℃的培养温度范围内,随温度升高,组胺生成量逐渐增加,在30℃有最高组胺生成量,约2 700ppm.菌种Ⅱ在25℃有组胺最高生成量约为2 400ppm.结论:依据两种组胺菌的特征和生理生化特征,分离菌可能分别属于弧菌属、埃希氏菌属.%Objective: Detecting the enzymes and the physiological and biochemical experiments of the isolates to ensure histamine forming bacteria from tuna fish.Method: Using histidine broth media,histamine forming bacteria were screened.Then histamine forming bacteria were analyzed through the biochemistry experiment and the morphology experiment.Result: Two histamine forming bacteria were isolated.Histamine increases gradually with temperature increase in the sample inoculated with strainⅠwhich stored at 5℃ to 30℃,it was detected at the most level of about 2700ppm in the sample inoculated with strainⅠwhich stored at 30℃.And Histamine was detected at the most level of about 2400ppm in the sample with strainⅡwhich stored at 25℃.Conclusion: Based on the biochemistry experiment and the morphology properties,the two histamine forming bacteria were likely to belong to Vibrio and Enterobacteriaceae.So,some important data would be referred to ensure histamine forming bacteria.

  10. A numerical model for predicting the fishing operation status of tuna longlines%金枪鱼延绳钓捕捞作业状态的数值模拟

    Institute of Scientific and Technical Information of China (English)

    万荣; 崔江浩; 宋协法; 唐衍力; 赵芬芳; 黄六一

    2005-01-01

    一种基于有限元原理的非线性混合法被用于预测捕捞作业中的金枪鱼延绳钓的形状与张力,为渔具设计提供理论方法,并以期在设计阶段能替代传统的水槽模型试验,为实际渔业生产作业调整提供有益的技术参数.构成延绳钓渔具的绳索可以被一系列绝对柔软的被称为绳索要素的单元所模拟,因此,整个延绳钓渔具可以被看作为一系列绳索要素在其两端点通过无摩擦铰接连接而成的集合体.根据最小位能原理,可以导出描述系统平衡状态的非线性基本平衡方程式.利用Newton-Raphson方法,通过一系列的负荷-形状迭代法求解基本平衡方程式,可以获得海流作用下延绳钓渔具作业时的形状和张力分布的数值解.简化模型的回流水槽试验验证表明,本方法具有较好的计算精度和解的收束性与稳定性.%In this paper, ropes are modeled as an infinitely flexible, straight rope element, and then the whole longline is able to be regarded as an assembling of the rope elements connecting each other at their ends by a frictionless hinge. A group of nonlinear basic simultaneous equations describing the equilibrium state of longlines are deduced, based on a finite element formulation. NewtonRaphson method is employed to get the numerical solution due to the non-linearity. Further, the loading and shape iterative procedure are used to model the coupling relationship between the longline shape and hydrodynamic forces. The results suggested that this method has excellent global convergence and good accuracy for predicting the tension and shape of tuna longlines during fishing operation.

  11. Multiple regression analysis of the factors affecting the sinking per-formance of large-scale tuna purse seine%金枪鱼围网沉降性能影响因子的多元回归分析

    Institute of Scientific and Technical Information of China (English)

    周成; 许柳雄; 张新峰; 朱国平; 唐浩; 王学昉

    2013-01-01

    We evaluated the relationship between sinking depth and a number of factors using multiple regression to determine the external patterns of sinking a purse seine. We collected data on sinking depth, gear operation, and shooting duration(T), shooting velocity(S), current speed(Cs), current direction(Cd), and purse line(L) length from tuna purse seiners owned by Shanghai Fisheries General Corp. between September and December in 2011. Current direction and shooting velocity had no effect on sinking depth (P>0.05, df=53). Conversely, the shooting duration, current speed, and length of the purse line had a significant effect on sinking depth (P0.05, df=53),而放网时间、流速及括纲长度对网具沉降深度的影响均显著(P<0.05, df=53),最终得到沉降深度(D)和放网时间(T)、流速(Cs)及扩纲长度(L)的多元回归模型为D=0.069T−144.5Cs2+0.022L+158。主成分分析表明,中国金枪鱼围网作业在一定程度上没有利用有关渔场海况信息对捕捞操作进行有益的改变。在一般操作条件(放网时间为550 s,括纲长度为2000 m)时,模型预测表明:在无风无流的情况下,网具沉降深度平均值为236.78 m,95%置信区间为[211.51,262.04],而遇海流急促的情况(流速为1 kn)时,网具沉降深度平均值为92.27 m,95%置信区间为[60.56,123.97]。

  12. The anti-obesity effects of a tuna peptide on 3T3-L1 adipocytes are mediated by the inhibition of the expression of lipogenic and adipogenic genes and by the activation of the Wnt/β-catenin signaling pathway.

    Science.gov (United States)

    Kim, Young-Min; Kim, In-Hye; Choi, Jeong-Wook; Lee, Min-Kyeong; Nam, Taek-Jeong

    2015-08-01

    The differentiation of 3T3-L1 cells into adipocytes involves the activation of an organized system of obesity-related genes, of which those encoding CCAAT/enhancer-binding proteins (C/EBPs) and the Wnt-10b protein may play integral roles. In a previous study of ours, we found that a specific peptide found in tuna (sequence D-I-V-D-K-I-E-I; termed TP-D) inhibited 3T3-L1 cell differentiation. In the present study, we observed that the expression of expression of C/EBPs and Wnt-10b was associated with obesity. The initial step of 3T3-L1 cell differentiation involved the upregulation of C/EBP-α expression, which in turn activated various subfactors. An upstream effector of glycogen synthase kinase-3β (GSK-3β) inhibited Wnt-10b expression in 3T3-L1 adipocytes. In a previous study of ours, we sequenced the tuna peptide via sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and quadrupole time-of-flight mass spectrometry (Q-TOF MS/MS) and confirmed the anti-obesity effects thereof in 3T3-L1 adipocytes. In the present study, we demonstrate that TP-D inhibits C/EBP and promotes Wnt-10b mRNA expression, thus activating the Wnt pathway. The inhibition of lipid accumulation was measured using a glucose and triglyceride (TG) assay. Our results confirmed that TP-D altered the expression levels of C/EBP-related genes in a dose-dependent manner and activated the Wnt signaling pathway. In addition, we confirmed that total adiponectin and high-molecular weight (HMW) adiponectin levels were reduced by treatment with TP-D. These data indicate that TP-D inhibits adipocyte differentiation through the