WorldWideScience

Sample records for hydroacoustic fishery assessment

  1. Users guide for the hydroacoustic coverage assessment model (HydroCAM)

    Energy Technology Data Exchange (ETDEWEB)

    Farrell, T., LLNL

    1997-12-01

    A model for predicting the detection and localization performance of hydroacoustic monitoring networks has been developed. The model accounts for major factors affecting global-scale acoustic propagation in the ocean. including horizontal refraction, travel time variability due to spatial and temporal fluctuations in the ocean, and detailed characteristics of the source. Graphical user interfaces are provided to setup the models and visualize the results. The model produces maps of network detection coverage and localization area of uncertainty, as well as intermediate results such as predicted path amplitudes, travel time and travel time variance. This Users Guide for the model is organized into three sections. First a summary of functionality available in the model is presented, including example output products. The second section provides detailed descriptions of each of models contained in the system. The last section describes how to run the model, including a summary of each data input form in the user interface.

  2. BBN technical memorandum W1310 hydroacoustic network capability studies

    Energy Technology Data Exchange (ETDEWEB)

    Angell, J., LLNL

    1997-12-01

    This report summarizes work performed under contract to Lawrence Livermore National Laboratory during the period 1 August to 30 November 1997. Four separate tasks were undertaken during this period which investigated various aspects of hydroacoustic network performance using the Hydroacoustic Coverage Assessment Model (HydroCAM). The purpose of this report is to document each of these tasks.

  3. 76 FR 18532 - Fisheries of the South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Assessment...

    Science.gov (United States)

    2011-04-04

    ... (Centropristis striata) and Golden Tilefish (Lopholatilus chamaeleonticeps). AGENCY: National Marine Fisheries... Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions...; stock assessment scientists, biologists, and researchers; constituency representatives including...

  4. 76 FR 45231 - Fisheries of the Caribbean; Southeastern Data, Assessment, and Review (SEDAR); Assessment...

    Science.gov (United States)

    2011-07-28

    ... Snapper, and Redtail Parrotfish AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions have implemented the... data collectors and database managers; stock assessment scientists, biologists, and researchers...

  5. Fishery management assessment Squaw Creek National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report provides an assessment for fishery management on Squaw Creek National Wildlife Refuge. The assessment concluded that existing Refuge waters are...

  6. 78 FR 48654 - Fisheries of the Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-08-09

    ..., Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS), National... Fishery Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine... managers; stock assessment scientists, biologists, and researchers; constituency representatives including...

  7. 77 FR 67341 - Fisheries of the South Atlantic; Southeast Data, Assessment and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2012-11-09

    ... Data, Assessment and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS... Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries... include: Data collectors and database managers; stock assessment scientists, biologists, and researchers...

  8. 78 FR 27957 - Fisheries of the South Atlantic, Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-05-13

    ... Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS... Fishery Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine... database managers; stock assessment scientists, biologists, and researchers; constituency representatives...

  9. 78 FR 16657 - Fisheries of the South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-03-18

    ... Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS... Fishery Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine... collectors and database managers; stock assessment scientists, biologists, and researchers; constituency...

  10. Assessing fishery and ecological consequences of alternate management options for multispecies fisheries

    OpenAIRE

    Thorpe, Robert; Dolder, Paul; Reeves, Stuart; Robinson, Peter; Jennings, Simon

    2016-01-01

    Demands for management advice on mixed and multispecies fisheries pose many challenges, further complicated by corresponding requests for advice on the environmental impacts of alternate management options. Here, we develop, and apply to North Sea fisheries, a method for collectively assessing the effects of, and interplay between, technical interactions, multispecies interactions, and the environmental effects of fishing. Ecological interactions involving 21 species are characterized with an...

  11. Economic Assessment of the Atlantic Coast Horseshoe Crab Fishery

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — In this report, Industrial Economics, Incorporated (lEc) provides an assessment of the economic value of the Atlantic Coast horseshoe crab fishery. We accomplish...

  12. An Assessment of Fishery Resources on Iroquois National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — A qualitative assessment of the fishery resources on Iroquois National Wildlife Refuge was conducted by Fish and Wildlife Service personnel in September 1993. This...

  13. Fishery management assessment Union Slough National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document discusses the current fishery program at Union Slough National Wildlife Refuge. Recommendations contained in this assessment were developed in...

  14. 76 FR 47563 - Fisheries of the South Atlantic; Southeast Data, Assessment, and Review (SEDAR); South Atlantic...

    Science.gov (United States)

    2011-08-05

    ... Tilefish (Lopholatilus chamaeleonticeps) AGENCY: National Marine Fisheries Service (NMFS), National Oceanic... with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions have implemented the... include data collectors and database managers; stock assessment scientists, biologists, and researchers...

  15. An ecosystem-based fisheries assessment and forecasting approach

    OpenAIRE

    Zhang, Chang Ik

    2009-01-01

    A comprehensive ecosystem-based approach is required to holistically assess, forecast and manage fisheries resources and their associated habitats by considering ecological interactions of target species with predators, competitors, and prey species, interactions between fishes and their habitats, and the effects of fishing on these processes. A pragmatic ecosystem-based approach was developed for the assessment of fisheries resources involving three management objectives: sustainability, bio...

  16. Application of fisheries management techniques to assessing impacts: task I report. [Assessment of chemical, radiological, and thermal impacts of nuclear power plants on fish populations

    Energy Technology Data Exchange (ETDEWEB)

    McKenzie, D.H.; Baker, K.S.; Fickeisen, D.H.; Metzger, R.M.; Skalski, J.R.

    1979-03-01

    Task I efforts examined the available fisheries management techniques and assessed their potential application in a confirmatory monitoring program. The objective of such monitoring programs is to confirm that the prediction of an insignificant impact (usually made in the FES) was correct. Fisheries resource managers have developed several tools for assessing the fish population response to stress (exploitation) and they were thought potentially useful for detecting nuclear power plant impacts. Techniques in three categories were examined; catch removal, population dynamics, and nondestructive censuses, and the report contains their description, examples of application, advantages, and disadvantages. The techniques applied at nuclear power plant sites were examined in detail to provide information on implementation and variability of specific approaches. The most suitable techniques to incorporate into a monitoring program confirming no impact appear to be those based on Catch Per Unity Effort (CPUE) and hydroacoustic data. In some specific cases, age and growth studies and indirect census techniques may be beneficial. Recommendations for task II efforts to incorporate these techniques into monitoring program designs are presented. These include development of guidelines for; (1) designing and implementing a data collection program; (2) interpreting these data and assessing the occurrence of impact, and (3) establishment of the monitoring program's ability to detect changes in the affected populations.

  17. 75 FR 78679 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-12-16

    ... Species (HMS) Fisheries Sandbar, Dusky, and Blacknose Sharks AGENCY: National Marine Fisheries Service... Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries...; stock assessment scientists, biologists, and researchers; constituency representatives including...

  18. 76 FR 22385 - Fisheries of the Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2011-04-21

    ..., Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS), National... Atlantic and Gulf States Marine Fisheries Commissions have implemented the Southeast Data, Assessment and... database managers; stock assessment scientists, biologists, and researchers; constituency representatives...

  19. Ocean acidification risk assessment for Alaska's fishery sector

    Science.gov (United States)

    Mathis, J. T.; Cooley, S. R.; Lucey, N.; Colt, S.; Ekstrom, J.; Hurst, T.; Hauri, C.; Evans, W.; Cross, J. N.; Feely, R. A.

    2015-08-01

    The highly productive fisheries of Alaska are located in seas projected to experience strong global change, including rapid transitions in temperature and ocean acidification-driven changes in pH and other chemical parameters. Many of the marine organisms that are most intensely affected by ocean acidification (OA) contribute substantially to the state's commercial fisheries and traditional subsistence way of life. Prior studies of OA's potential impacts on human communities have focused only on possible direct economic losses from specific scenarios of human dependence on commercial harvests and damages to marine species. However, other economic and social impacts, such as changes in food security or livelihoods, are also likely to result from climate change. This study evaluates patterns of dependence on marine resources within Alaska that could be negatively impacted by OA and current community characteristics to assess the potential risk to the fishery sector from OA. Here, we used a risk assessment framework based on one developed by the Intergovernmental Panel on Climate Change to analyze earth-system global ocean model hindcasts and projections of ocean chemistry, fisheries harvest data, and demographic information. The fisheries examined were: shellfish, salmon and other finfish. The final index incorporates all of these data to compare overall risk among Alaska's federally designated census areas. The analysis showed that regions in southeast and southwest Alaska that are highly reliant on fishery harvests and have relatively lower incomes and employment alternatives likely face the highest risk from OA. Although this study is an intermediate step toward our full understanding, the results presented here show that OA merits consideration in policy planning, as it may represent another challenge to Alaskan communities, some of which are already under acute socio-economic strains.

  20. 78 FR 15706 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-03-12

    ... Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS... Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries.... Participants include: data collectors and database managers; stock assessment scientists, biologists, and...

  1. 78 FR 15707 - Fisheries of the Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2013-03-12

    ...; Southeast Data, Assessment, and Review (SEDAR): Public Meeting AGENCY: National Marine Fisheries Service... Fishery Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine...; stock assessment scientists, biologists, and researchers; constituency representatives including...

  2. 78 FR 62586 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2013-10-22

    ... Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries... Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries... collectors and database managers; stock assessment scientists, biologists, and researchers; constituency...

  3. 75 FR 61705 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-10-06

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries... Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions have implemented the Southeast Data... database managers; stock assessment scientists, biologists, and researchers; constituency representatives...

  4. 78 FR 15708 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-03-12

    ... Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS... Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions, have implemented the Southeast Data... assessment scientists, biologists, and researchers; constituency representatives including fishermen...

  5. Participatory assessment of the Toliara Bay reef fishery, southwest Madagascar

    Directory of Open Access Journals (Sweden)

    Jamal Mahafina

    2011-12-01

    Full Text Available In order to ensure the sustainable management of reef fisheries, it is necessary to obtain data about the effects of these fisheries on both fish resources and the ecosystems that sustain them. Ecosystem-based surveys provide this information, but are difficult to implement because of technical, financial and human resources requirements. In this regard participatory assessment methods have the potential to increase the amount of data collected at low cost, while taking advantage of local traditional ecological knowledge. In order to investigate the reef fishery of Toliara Bay, southwest Madagascar, we used participatory fish survey and interview data collected on site. These methods included: (i monitoring of catch landings during six months by wholesale fish merchants, (ii household surveys of fishing catch and effort and fish consumption conducted by school children, and (iii semi-structured interviews of reef users. One thousand five hundred and eighty six fishing trips were sampled between September 2006 and February 2007, 326 households were surveyed by trained school children in January 2007, and 70 reef users were interviewed in July/August 2006. Data collected by participants have been compiled and compared to reference values when available, allowing an assessment of the sustainability of the reef fishery. The results of this study confirm the unsustainable nature of resource exploitation and underline the need for rapid management responses in order to reverse this trend. It also highlights the great potential of participatory assessment methods for gathering large amounts of relevant information on the status and evolution of the ecosystem upon which the fishery depends, while promoting education and awareness about the protection and sustainable use of natural resources.

  6. 76 FR 13986 - Fisheries of the South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2011-03-15

    ... Workshop will be held in the auditorium at the NOAA Center for Coastal Fisheries and Habitat Research, 101... Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS... Atlantic and Gulf States Marine Fisheries Commissions have implemented the Southeast Data, Assessment...

  7. 77 FR 26746 - Fisheries of the Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2012-05-07

    ... Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... the Atlantic and Gulf States Marine Fisheries Commissions have implemented the Southeast Data... database managers; stock assessment scientists, biologists, and researchers; constituency representatives...

  8. Stock assessment in inland fisheries: a foundation for sustainable use and conservation

    Science.gov (United States)

    Lorenzen, Kai; Cowx, Ian G.; Entsua-Mensah, R. E. M.; Lester, Nigel P.; Koehn, J.D.; Randall, R.G.; So, N.; Bonar, Scott A.; Bunnell, David; Venturelli, Paul A.; Bower, Shannon D.; Cooke, Steven J.

    2016-01-01

    Fisheries stock assessments are essential for science-based fisheries management. Inland fisheries pose challenges, but also provide opportunities for biological assessments that differ from those encountered in large marine fisheries for which many of our assessment methods have been developed. These include the number and diversity of fisheries, high levels of ecological and environmental variation, and relative lack of institutional capacity for assessment. In addition, anthropogenic impacts on habitats, widespread presence of non-native species and the frequent use of enhancement and restoration measures such as stocking affect stock dynamics. This paper outlines various stock assessment and data collection approaches that can be adapted to a wide range of different inland fisheries and management challenges. Although this paper identifies challenges in assessment, it focuses on solutions that are practical, scalable and transferrable. A path forward is suggested in which biological assessment generates some of the critical information needed by fisheries managers to make effective decisions that benefit the resource and stakeholders.

  9. 77 FR 75613 - Fisheries of the South Atlantic; Southeast Data, Assessment and Review (SEDAR); Data Webinar for...

    Science.gov (United States)

    2012-12-21

    ... capriscus) and Blueline Tilefish (Caulolatilus microps) AGENCY: National Marine Fisheries Service (NMFS... Fishery Management Councils, in conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine.... Participants include data collectors and database managers; stock assessment scientists, biologists, and...

  10. 75 FR 32746 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-06-09

    ... yellowedge grouper and tilefish. AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... conjunction with NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions have implemented... data collectors and database managers; stock assessment scientists, biologists, and researchers...

  11. 77 FR 60967 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2012-10-05

    ... and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS), National Oceanic...; stock assessment scientists, biologists, and researchers; constituency representatives including... Deputy Director, Office of Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE 3510-22...

  12. Stock assessment of fishery target species in Lake Koka, Ethiopia

    Directory of Open Access Journals (Sweden)

    Gashaw Tesfaye

    2015-09-01

    Full Text Available Effective management is essential for small-scale fisheries to continue providing food and livelihoods for households, particularly in developing countries where other options are often limited. Studies on the population dynamics and stock assessment on fishery target species are thus imperative to sustain their fisheries and the benefits for the society. In Lake Koka (Ethiopia, very little is known about the vital population parameters and exploitation status of the fishery target species: tilapia Oreochromis niloticus,common carp Cyprinus carpióand catfish Clarias gariepinus.Our study, therefore, aimed at determining the vital population parameters and assessing the status of these target species in Lake Koka using length frequency data collected quarterly from commercial catches from 2007-2012. A total of 20 097 fish specimens (distributed as 7 933 tilapia, 6 025 catfish and 6 139 common carp were measured for the analysis. Von Bertalanffy growth parameters and their confidence intervals were determined from modal progression analysis using ELEFAN I and applying the jackknife technique. Mortality parameters were determined from length-converted catch curves and empirical models. The exploitation status of these target species were then assessed by computing exploitation rates (E from mortality parameters as well as from size indicators i.e., assessing the size distribution of fish catches relative to the size at maturity (L m,the size that provides maximum cohort biomass (Lopt and the abundance of mega-spawners. The mean value of growth parameters L x, Kand the growth performance index 0' were 44.5 cm, 0.41/year and 2.90 for O. niloticus,74.1 cm, 0.28/year and 3.19 for C. carpioand 121.9 cm, 0.16/year and 3.36 for C. gariepinus,respectively. The 95 % confidence intervals of the estimates were also computed. Total mortality (Z estimates were 1.47, 0.83 and 0.72/year for O. niloticus, C. carpioand C. gariepinus,respectively. Our study suggest

  13. Stock assessment of fishery target species in Lake Koka, Ethiopia.

    Science.gov (United States)

    Tesfaye, Gashaw; Wolff, Matthias

    2015-09-01

    Effective management is essential for small-scale fisheries to continue providing food and livelihoods for households, particularly in developing countries where other options are often limited. Studies on the population dynamics and stock assessment on fishery target species are thus imperative to sustain their fisheries and the benefits for the society. In Lake Koka (Ethiopia), very little is known about the vital population parameters and exploitation status of the fishery target species: tilapia Oreochromis niloticus, common carp Cyprinus carpio and catfish Clarias gariepinus. Our study, therefore, aimed at determining the vital population parameters and assessing the status of these target species in Lake Koka using length frequency data collected quarterly from commercial catches from 2007-2012. A total of 20,097 fish specimens (distributed as 7,933 tilapia, 6,025 catfish and 6,139 common carp) were measured for the analysis. Von Bertalarffy growth parameters and their confidence intervals were determined from modal progression analysis using ELEFAN I and applying the jackknife technique. Mortality parameters were determined from length-converted catch curves and empirical models. The exploitation status of these target species were then assessed by computing exploitation rates (E) from mortality parameters as well as from size indicators i.e., assessing the size distribution of fish catches relative to the size at maturity (Lm), the size that provides maximum cohort biomass (Lopt) and the abundance of mega-spawners. The mean value of growth parameters L∞, K and the growth performance index ø' were 44.5 cm, 0.41/year and 2.90 for O. niloticus, 74.1 cm, 0.28/year and 3.19 for C. carpio and 121.9 cm, 0.16/year and 3.36 for C. gariepinus, respectively. The 95 % confidence intervals of the estimates were also computed. Total mortality (Z) estimates were 1.47, 0.83 and 0.72/year for O. niloticus, C. carpio and C. gariepinus, respectively. Our study suggest that

  14. Participatory assessment of the Toliara Bay reef fishery, southwest ...

    African Journals Online (AJOL)

    2011-12-22

    Dec 22, 2011 ... Although coral reef fisheries account for a small proportion of global fisheries catches ... targeted and can also cause severe damage to non - target spe- cies, habitats ...... of human activities and suggestions for management.

  15. 77 FR 16812 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2012-03-22

    ... Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS... Marine Fisheries Commissions have implemented the Southeast Data, Assessment and Review (SEDAR) process... collectors and database managers; stock assessment scientists, biologists, and researchers; constituency...

  16. 75 FR 35442 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater...

    Science.gov (United States)

    2010-06-22

    ... Data, Assessment, and Review (SEDAR) Update; Greater Amberjack. AGENCY: National Marine Fisheries... and Gulf States Marine Fisheries Commissions have implemented the Southeast Data, Assessment and.... Participants include data collectors and database managers; stock assessment scientists, biologists, and...

  17. Assessment of the Fishery Improvement Opportunities on the Pend Oreille River: Recommendations for Fisheries Enhancement: Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Ashe, Becky L.; Scholz, Allan T.

    1992-03-01

    This report recommends resident fish substitution projects to partially replace anadromous fish losses caused by construction of Grand Coulee and Chief Joseph Dams. These recommendations involve enhancing the resident fishery in the Pend Oreille River as a substitute for anadromous fish losses. In developing these recommendations we have intentionally attempted to minimize the impact upon the hydroelectric system and anadromous fish recovery plans. In this report we are recommending that the Northwest Power Planning Council direct Bonneville Power Administration to fund the proposed enhancement measures as resident fish substitution projects under the NPPC's Columbia Basin Fish and Wildlife Program. The Pend Oreille River, located in northeast Washington, was historically a free flowing river which supported anadromous steelhead trout and chinook salmon, and large resident cutthroat trout and bull trout. In 1939, Grand Coulee Dam eliminated the anadromous species from the river. In 1955, Box Canyon Dam was constructed, inundating resident trout habitat in the river and creating many back water and slough areas. By the late 1950's the fishery in the reservoir had changed from a quality trout fishery to a warm water fishery, supporting largemouth bass, yellow perch and rough fish (tenth, suckers, squawfish). The object of this study was to examine the existing fishery, identify fishery improvement opportunities and recommend fishery enhancement projects. Three years of baseline data were collected from the Box Canyon portion of the Pend Oreille River to assess population dynamics, growth rates, feeding habits, behavior patterns and factors limiting the fishery. Fishery improvement opportunities were identified based on the results of these data. Relative abundance surveys in the reservoir resulted in the capture of 47,415 fish during the study. The most abundant species in the reservoir were yellow perch, composing 44% of the fish captured. The perch

  18. 77 FR 40587 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2012-07-10

    ... National Oceanic and Atmospheric Administration Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries... the SEDAR assessment schedule. See SUPPLEMENTARY INFORMATION. DATES: The SEDAR Steering Committee will...

  19. 77 FR 23661 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2012-04-20

    ... Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... SEDAR process and assessment schedule. See SUPPLEMENTARY INFORMATION. DATES: The SEDAR Steering... Atlantic, Gulf of Mexico, and Caribbean Fishery Management Councils; in conjunction with NOAA Fisheries...

  20. 75 FR 61702 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment and Review (SEDAR...

    Science.gov (United States)

    2010-10-06

    ... Mexico; Southeast Data, Assessment and Review (SEDAR); South Atlantic Fishery Management Council (SAFMC) Scientific and Statistical Committee (SSC); Gulf of Mexico Fishery Management Council (GMFMC) Scientific and... Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR spiny lobster update assessment review...

  1. 78 FR 17357 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-03-21

    ... Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS... the Atlantic and Gulf States Marine Fisheries Commissions, have implemented the Southeast Data... managers; stock assessment scientists, biologists, and researchers; constituency representatives including...

  2. 78 FR 36525 - Fisheries of the Atlantic and the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2013-06-18

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries... the Atlantic and Gulf States Marine Fisheries Commissions, have implemented the Southeast Data...: data collectors and database managers; stock assessment scientists; biologists, and researchers...

  3. 76 FR 17627 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeastern Data, Assessment...

    Science.gov (United States)

    2011-03-30

    ... Mexico, and Caribbean; Southeastern Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... the SEDAR assessment schedule, budget, and the SEDAR process. See SUPPLEMENTARY INFORMATION. DATES... South Atlantic, Gulf of Mexico, and Caribbean Fishery Management Councils; in conjunction with NOAA...

  4. 75 FR 59226 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeastern Data, Assessment...

    Science.gov (United States)

    2010-09-27

    ... Mexico, and Caribbean; Southeastern Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... the SEDAR assessment schedule, budget, and the SEDAR process. See SUPPLEMENTARY INFORMATION. DATES...) 769-4520. SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico, and Caribbean Fishery...

  5. Fisheries and Oceans Canada climate change risk assessment initiative

    Energy Technology Data Exchange (ETDEWEB)

    Dalpe, R. [Fisheries and Oceans, Ottawa, ON (Canada)

    2005-07-01

    This paper provided an overview of an initiative undertaken by the Department of Fisheries and Oceans (DFO) Canada to assess the risks associated with climate change on Canada's waterways and aquatic resources over the next 10 to 20 years. It discussed the risk associated with changes in water temperature and level in increasing the vulnerability of fish stocks and ecosystems. A decrease in water levels is also an issue as it will render current infrastructure ineffective. Storm surges can also have an impact on coastal community infrastructure. The purpose of the assessment was to provide DFO management with a structured understanding of the major climate change factors that pose risks to DFO's operations and to establish priorities in identifying appropriate risk mitigation responses. The presentation discussed the different stages of the initiative (planning, identification and evaluation of risk, validation, and reporting), its' challenges and benefits, as well as lessons learned from this exercises. Lessons learned from the project are as follows: get senior level buy-in from the outset; engage the right people; make it easy for others to be engaged; validate results and risk management response; be ready for surprises; and build in some flexibility to the process. figs.

  6. Dworshak Dam Impact Assessment and Fishery Investigation, 1989 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Mauser, Gregg; Cannamela, David; Downing, Richard

    1990-06-01

    The Bonneville Power Administration (BPA) funded two 4-year research projects to develop recommendations for improving the sport fishery on Dworshak Reservoir. Research began during 1987 as a cooperative effort between the Idaho Department of Fish and Game (IDFG) and the Nez Perce Tribe of Idaho. The Nez Perce Tribe examined smallmouth bass and rainbow trout fisheries. The IDFG evaluated kokanee population dynamics and documented changes in reservoir productivity. 12 refs., 12 figs.

  7. Hydroacoustic propagation grids for the CTBT knowledge databaes BBN technical memorandum W1303

    Energy Technology Data Exchange (ETDEWEB)

    J. Angell

    1998-05-01

    The Hydroacoustic Coverage Assessment Model (HydroCAM) has been used to develop components of the hydroacoustic knowledge database required by operational monitoring systems, particularly the US National Data Center (NDC). The database, which consists of travel time, amplitude correction and travel time standard deviation grids, is planned to support source location, discrimination and estimation functions of the monitoring network. The grids will also be used under the current BBN subcontract to support an analysis of the performance of the International Monitoring System (IMS) and national sensor systems. This report describes the format and contents of the hydroacoustic knowledgebase grids, and the procedures and model parameters used to generate these grids. Comparisons between the knowledge grids, measured data and other modeled results are presented to illustrate the strengths and weaknesses of the current approach. A recommended approach for augmenting the knowledge database with a database of expected spectral/waveform characteristics is provided in the final section of the report.

  8. 78 FR 9372 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-02-08

    ... National Oceanic and Atmospheric Administration RIN 0648-XC491 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS...: The South Atlantic, Gulf of Mexico and Caribbean Fishery Management Councils, in conjunction with NOAA...

  9. 77 FR 66818 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment...

    Science.gov (United States)

    2012-11-07

    ... and Cobia AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric..., biologists, and researchers; constituency representatives including fishermen, environmentalists, and non... Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE 3510-22-P ...

  10. Evolutionary impact assessment of the north sea plaice fishery

    NARCIS (Netherlands)

    Mollet, Fabian M.; Poos, Jan Jaap; Dieckmann, Ulf; Rijnsdorp, Adriaan D.

    2016-01-01

    There is growing evidence that fishing causes evolution in life-history traits that affect the productivity of fish stocks. Here we explore the impact of fisheries-induced evolution (FIE) on the productivity of North Sea plaice (Pleuronectes platessa) using an ecogenetic, individual-based model b

  11. Lower Columbia River Terminal Fisheries Research Project : Final Environmental Assessment.

    Energy Technology Data Exchange (ETDEWEB)

    United States. Bonneville Power Administration.

    1995-04-01

    This notice announces BPA`S`s decision to fund the Oregon Department of Fish and Wildlife (ODFW), the Washington Department of Fish and Wildlife (WDFW), and the Clatsop Economic Development Committee for the Lower Columbia River Terminal Fisheries Research Project (Project). The Project will continue the testing of various species/stocks, rearing regimes, and harvest options for terminal fisheries, as a means to increase lower river sport and commercial harvest of hatchery fish, while providing both greater protection of weaker wild stocks and increasing the return of upriver salmon runs to potential Zone 6 Treaty fisheries. The Project involves relocating hatchery smolts to new, additional pen locations in three bays/sloughs in the lower Columbia River along both the Oregon and Washington sides. The sites are Blind Slough and Tongue Point in Clatsop County, Oregon, and Grays Bay/Deep River, Wahkiakum County, Washington. The smolts will be acclimated for various lengths of time in the net pens and released from these sites. The Project will expand upon an existing terminal fisheries project in Youngs Bay, Oregon. The Project may be expanded to other sites in the future, depending on the results of this initial expansion. BPA`S has determined the project is not a major Federal action significantly affecting the quality of the human environment, within the meaning of the National Environmental Policy Act (NEPA) of 1969. Therefore, the preparation of an environmental impact statement is not required, and BPA`S is issuing this FONSI.

  12. Using grizzly bears to assess harvest-ecosystem tradeoffs in salmon fisheries.

    Science.gov (United States)

    Levi, Taal; Darimont, Chris T; Macduffee, Misty; Mangel, Marc; Paquet, Paul; Wilmers, Christopher C

    2012-01-01

    Implementation of ecosystem-based fisheries management (EBFM) requires a clear conceptual and quantitative framework for assessing how different harvest options can modify benefits to ecosystem and human beneficiaries. We address this social-ecological need for Pacific salmon fisheries, which are economically valuable but intercept much of the annual pulse of nutrient subsidies that salmon provide to terrestrial and aquatic food webs. We used grizzly bears, vectors of salmon nutrients and animals with densities strongly coupled to salmon abundance, as surrogates for "salmon ecosystem" function. Combining salmon biomass and stock-recruitment data with stable isotope analysis, we assess potential tradeoffs between fishery yields and bear population densities for six sockeye salmon stocks in Bristol Bay, Alaska, and British Columbia (BC), Canada. For the coastal stocks, we find that both bear densities and fishery yields would increase substantially if ecosystem allocations of salmon increase from currently applied lower to upper goals and beyond. This aligning of benefits comes at a potential cost, however, with the possibility of forgoing harvests in low productivity years. In contrast, we detect acute tradeoffs between bear densities and fishery yields in interior stocks within the Fraser River, BC, where biomass from other salmon species is low. There, increasing salmon allocations to ecosystems would benefit threatened bear populations at the cost of reduced long-term yields. To resolve this conflict, we propose an EBFM goal that values fisheries and bears (and by extension, the ecosystem) equally. At such targets, ecosystem benefits are unexpectedly large compared with losses in fishery yields. To explore other management options, we generate tradeoff curves that provide stock-specific accounting of the expected loss to fishers and gain to bears as more salmon escape the fishery. Our approach, modified to suit multiple scenarios, provides a generalizable method

  13. Using grizzly bears to assess harvest-ecosystem tradeoffs in salmon fisheries.

    Directory of Open Access Journals (Sweden)

    Taal Levi

    Full Text Available Implementation of ecosystem-based fisheries management (EBFM requires a clear conceptual and quantitative framework for assessing how different harvest options can modify benefits to ecosystem and human beneficiaries. We address this social-ecological need for Pacific salmon fisheries, which are economically valuable but intercept much of the annual pulse of nutrient subsidies that salmon provide to terrestrial and aquatic food webs. We used grizzly bears, vectors of salmon nutrients and animals with densities strongly coupled to salmon abundance, as surrogates for "salmon ecosystem" function. Combining salmon biomass and stock-recruitment data with stable isotope analysis, we assess potential tradeoffs between fishery yields and bear population densities for six sockeye salmon stocks in Bristol Bay, Alaska, and British Columbia (BC, Canada. For the coastal stocks, we find that both bear densities and fishery yields would increase substantially if ecosystem allocations of salmon increase from currently applied lower to upper goals and beyond. This aligning of benefits comes at a potential cost, however, with the possibility of forgoing harvests in low productivity years. In contrast, we detect acute tradeoffs between bear densities and fishery yields in interior stocks within the Fraser River, BC, where biomass from other salmon species is low. There, increasing salmon allocations to ecosystems would benefit threatened bear populations at the cost of reduced long-term yields. To resolve this conflict, we propose an EBFM goal that values fisheries and bears (and by extension, the ecosystem equally. At such targets, ecosystem benefits are unexpectedly large compared with losses in fishery yields. To explore other management options, we generate tradeoff curves that provide stock-specific accounting of the expected loss to fishers and gain to bears as more salmon escape the fishery. Our approach, modified to suit multiple scenarios, provides a

  14. 75 FR 53951 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater...

    Science.gov (United States)

    2010-09-02

    ... Assessment Conference Call for Gulf of Mexico greater amberjack. SUMMARY: The SEDAR update of the assessment... National Oceanic and Atmospheric Administration RIN 0648-XY63 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater Amberjack AGENCY: National Marine Fisheries...

  15. 75 FR 51982 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater...

    Science.gov (United States)

    2010-08-24

    ... Assessment Webinars. SUMMARY: The SEDAR update of the assessment of the Gulf of Mexico stock of greater... National Oceanic and Atmospheric Administration RIN 0648-XY34 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Update; Greater Amberjack AGENCY: National Marine Fisheries...

  16. 77 FR 70149 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2012-11-23

    ... 28 Gulf of Mexico Spanish mackerel and cobia assessment Webinar. SUMMARY: The SEDAR 28 assessment of... National Oceanic and Atmospheric Administration RIN 0648-XC328 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS...

  17. 78 FR 8111 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-02-05

    ... red snapper assessment webinars. SUMMARY: The SEDAR 31 assessment of the Gulf of Mexico red snapper... National Oceanic and Atmospheric Administration RIN 0648-XC479 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS...

  18. A method to assess social sustainability of capture fisheries: An application to a Norwegian trawler

    NARCIS (Netherlands)

    Veldhuizen, L.J.L.; Berentsen, P.B.M.; Bokkers, E.A.M.; Boer, de I.J.M.

    2015-01-01

    Social sustainability assessment of capture fisheries is, both in terms of method development and measurement, not well developed. The objective of this study, therefore, was to develop a method consisting of indicators and rubrics (i.e. categories that articulate levels of performance) to assess so

  19. 75 FR 17900 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeastern Data, Assessment...

    Science.gov (United States)

    2010-04-08

    ... Mexico, and Caribbean; Southeastern Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... the SEDAR assessment schedule and the SEDAR process. See SUPPLEMENTARY INFORMATION. DATES: The SEDAR.... SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico, and Caribbean Fishery Management Councils; in...

  20. Collaborative assessment of California spiny lobster population and fishery responses to a marine reserve network.

    Science.gov (United States)

    Kay, Matthew C; Lenihan, Hunter S; Guenther, Carla M; Wilson, Jono R; Miller, Christopher J; Shrout, Samuel W

    2012-01-01

    Assessments of the conservation and fisheries effects of marine reserves typically focus on single reserves where sampling occurs over narrow spatiotemporal scales. A strategy for broadening the collection and interpretation of data is collaborative fisheries research (CFR). Here we report results of a CFR program formed in part to test whether reserves at the Santa Barbara Channel Islands, USA, influenced lobster size and trap yield, and whether abundance changes in reserves led to spillover that influenced trap yield and effort distribution near reserve borders. Industry training of scientists allowed us to sample reserves with fishery relevant metrics that we compared with pre-reserve fishing records, a concurrent port sampling program, fishery effort patterns, the local ecological knowledge (LEK) of fishermen, and fishery-independent visual surveys of lobster abundance. After six years of reserve protection, there was a four- to eightfold increase in trap yield, a 5-10% increase in the mean size (carapace length) of legal sized lobsters, and larger size structure of lobsters trapped inside vs. outside of three replicate reserves. Patterns in trap data were corroborated by visual scuba surveys that indicated a four- to sixfold increase in lobster density inside reserves. Population increases within reserves did not lead to increased trap yields or effort concentrations (fishing the line) immediately outside reserve borders. The absence of these catch and effort trends, which are indicative of spillover, may be due to moderate total mortality (Z = 0.59 for legal sized lobsters outside reserves), which was estimated from analysis of growth and length frequency data collected as part of our CFR program. Spillover at the Channel Islands reserves may be occurring but at levels that are insufficient to influence the fishery dynamics that we measured. Future increases in fishing effort (outside reserves) and lobster biomass (inside reserves) are likely and may lead to

  1. 77 FR 11066 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2012-02-24

    ... National Oceanic and Atmospheric Administration RIN 0648-XA924 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR Data/Assessment...

  2. 78 FR 8110 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-02-05

    ... dumerili). SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico gag grouper and greater amberjack... National Oceanic and Atmospheric Administration RIN 0648-XC480 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS...

  3. 76 FR 103 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2011-01-03

    ... for Gulf of Mexico yellowedge grouper and tilefish. SUMMARY: The SEDAR assessments of the Gulf of... National Oceanic and Atmospheric Administration RIN 0648-XA118 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS...

  4. 78 FR 52761 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings...

    Science.gov (United States)

    2013-08-26

    ... to a public meeting notice. SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico stocks of gag... National Oceanic and Atmospheric Administration RIN 0648-XC642 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings; Correction AGENCY: National Marine Fisheries...

  5. 77 FR 11065 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2012-02-24

    ...: The SEDAR 28 assessments of the Gulf of Mexico and South Atlantic stocks of Spanish mackerel and cobia... National Oceanic and Atmospheric Administration RIN 0648-XB022 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries...

  6. 78 FR 67339 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-11-12

    ... gag and greater amberjack webinars. SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico stocks of... National Oceanic and Atmospheric Administration RIN 0648-XC948 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS...

  7. 78 FR 34046 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-06-06

    ... National Oceanic and Atmospheric Administration RIN 0648-XC708 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR Data/Assessment...

  8. 77 FR 53869 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2012-09-04

    ... Mexico Red Snapper Post-Data Workshop Webinar. SUMMARY: The SEDAR 31 assessment of the Gulf of Mexico Red... National Oceanic and Atmospheric Administration RIN 0648-XC214 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service (NMFS...

  9. 78 FR 33069 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings...

    Science.gov (United States)

    2013-06-03

    .... SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico stocks of gag (Mycteroperca microlepis) and greater... National Oceanic and Atmospheric Administration RIN 0648-XC642 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings; Correction AGENCY: National Marine Fisheries...

  10. 76 FR 10887 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2011-02-28

    ... National Oceanic and Atmospheric Administration RIN 0648-XA246 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries... 21 Highly Migratory Species (HMS) of sandbar, dusky, and blacknose sharks assessment webinar. SUMMARY...

  11. 76 FR 13985 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2011-03-15

    ... National Oceanic and Atmospheric Administration RIN 0648-XA287 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries... SEDAR assessments of the HMS stocks of sandbar, dusky, and blacknose sharks consists of a series of...

  12. 76 FR 77491 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2011-12-13

    .... SUMMARY: The SEDAR 28 assessments of the Gulf of Mexico and South Atlantic stocks of Spanish mackerel and... National Oceanic and Atmospheric Administration RIN 0648-XA863 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries...

  13. 75 FR 23676 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-05-04

    ... National Oceanic and Atmospheric Administration RIN: 0648-XW25 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries... Data Workshop for HMS sandbar, dusky, and blacknose sharks. SUMMARY: The SEDAR assessments of the HMS...

  14. 77 FR 43049 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment and Review (SEDAR...

    Science.gov (United States)

    2012-07-23

    ... Webinar. SUMMARY: The SEDAR 28 assessment of the Gulf of Mexico and South Atlantic Spanish mackerel and... National Oceanic and Atmospheric Administration Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries Service...

  15. Evolutionary impact assessment: Accounting for the evolutionary consequences of fishing in an ecosystem approach to fisheries management

    DEFF Research Database (Denmark)

    Laugen, Ane T.; Engelhard, Georg H.; Whitlock, Rebecca

    2014-01-01

    Managing fisheries resources to maintain healthy ecosystems is one of the main goals of the ecosystem approach to fisheries (EAF). While a number of international treaties call for the implementation of EAF, there are still gaps in the underlying methodology. One aspect that has received substant...... and ecological relations, support the precautionary approach to fisheries management by addressing a previously overlooked source of uncertainty and risk, and thus contribute to sustainable fisheries......Managing fisheries resources to maintain healthy ecosystems is one of the main goals of the ecosystem approach to fisheries (EAF). While a number of international treaties call for the implementation of EAF, there are still gaps in the underlying methodology. One aspect that has received...... describe the evolutionary impact assessment (EvoIA) as a structured approach for assessing the evolutionary consequences of fishing and evaluating the predicted evolutionary outcomes of alternative management options. EvoIA can contribute to EAF by clarifying how evolution may alter stock properties...

  16. A method to assess social sustainability of capture fisheries: An application to a Norwegian trawler

    Energy Technology Data Exchange (ETDEWEB)

    Veldhuizen, L.J.L., E-mail: linda.veldhuizen@wur.nl [Animal Production Systems group, Wageningen University, P.O. Box 338, 6700 AH Wageningen (Netherlands); Berentsen, P.B.M. [Business Economics group, Wageningen University, P.O. Box 8130, 6700 EW Wageningen (Netherlands); Bokkers, E.A.M.; Boer, I.J.M. de [Animal Production Systems group, Wageningen University, P.O. Box 338, 6700 AH Wageningen (Netherlands)

    2015-07-15

    Social sustainability assessment of capture fisheries is, both in terms of method development and measurement, not well developed. The objective of this study, therefore, was to develop a method consisting of indicators and rubrics (i.e. categories that articulate levels of performance) to assess social sustainability of capture fisheries. This method was applied to a Norwegian trawler that targets cod and haddock in the northeast Atlantic. Based on previous research, 13 social sustainability issues were selected. To measure the state of these issues, 17 process and outcome indicators were determined. To interpret indicator values, rubrics were developed for each indicator, using standards set by international conventions or data retrieved from national statistics, industry agreements or scientific publications that explore rubric scales. The indicators and rubrics were subsequently used in a social sustainability assessment of a Norwegian trawler. This assessment indicated that overall, social sustainability of this trawler is relatively high, with high rubric scores, for example, for worker safety, provisions aboard for the crew and companies' salary levels. The assessment also indicated that the trawler could improve on healthy working environment, product freshness and fish welfare during capture. This application demonstrated that our method provides insight into social sustainability at the level of the vessel and can be used to identify potential room for improvement. This method is also promising for social sustainability assessment of other capture fisheries. - Highlights: • A method was developed for social sustainability assessment of capture fisheries. • This method entailed determining outcome and process indicators for important issues. • To interpret indicator values, a rubric was developed for each indicator. • Use of this method gives insight into social sustainability and improvement options. • This method is promising for social

  17. Optimization of Hydroacoustic Equipment Deployment at Foster Dam, 2013

    Energy Technology Data Exchange (ETDEWEB)

    Hughes, James S.; Johnson, Gary E.; Ploskey, Gene R.; Hennen, Matthew J.; Fischer, Eric S.; Zimmerman, Shon A.

    2013-03-01

    The goal of the study was to optimize performance of the fixed-location hydroacoustic systems at Foster Dam (FOS) by determining deployment and data acquisition methods that minimized structural, electrical, and acoustic interference. Optimization of the hydroacoustic systems will establish methodology for sampling by active acoustic methods during this year-long evaluation of juvenile salmonid passage at FOS.

  18. Optimization of Hydroacoustic Equipment Deployment at Foster Dam, 2013

    Energy Technology Data Exchange (ETDEWEB)

    Hughes, James S.; Johnson, Gary E.; Ploskey, Gene R.; Hennen, Matthew J.; Fischer, Eric S.; Zimmerman, Shon A.

    2013-03-01

    The goal of the study was to optimize performance of the fixed-location hydroacoustic systems at Foster Dam (FOS) by determining deployment and data acquisition methods that minimized structural, electrical, and acoustic interference. Optimization of the hydroacoustic systems will establish methodology for sampling by active acoustic methods during this year-long evaluation of juvenile salmonid passage at FOS.

  19. Hydroacoustic registration of fish abundance of offshore wind farms. Horns Rev offshore wind farm. Annual report 2004.

    Energy Technology Data Exchange (ETDEWEB)

    Hvidt, C.B.; Bruenner, L.; Reier Knudsen, F.

    2005-05-15

    Elsam Engineering AS has approved the implementation of a project concerning the registration of fish communities in Horns Rev Offshore Wind Farm with use of hydroacoustic methods. In a joint effort, Bio/consult as, Carl Bro as and SIMRAD AS have monitored the fish communities at Horns Rev Offshore Wind Farm using a new hydroacoustic methodology. The new hydroacoustic technique combines the use of scientific sonar acoustics with GPS to determine the density, diversity and location of fish. The objectives of this project were to test the possibility of using hydroacoustic techniques as alternative methods to traditional techniques to assess the fish assemblage inhabiting offshore wind farms and to investigate the possible effect from the wind farm and hard bottom substrates (turbine foundations) on fish abundance. The field study was carried out October 9-10, 2004 and consisted of four horizontal hydroacoustic survey transects each covering impact and reference areas. Transects were surveyed in order to achieve identical impact and reference transect pairs concerning environment, topography and time correspondence. The hydroacoustic equipment consisted of a SIMRAD EK60/EY60 echo sounder with a split-beam transducer (Simrad ES 120-4x10) mounted on a pan and tilt unit, a transceiver, a laptop extended with a GPS-receiver and additional large external hard discs. The raw data files from EK60 were converted to echogram files suitable for the post processing application, Sonar5-Pro. The Sonar5-Pro software makes it possible to filter out echo detections from the surface and the bottom, as well as perform cross filter detection. The validity of the results using the hydroacoustic method is high due to the cross filtering and single target tracking technique. From the hydroacoustic results, no or very little effect from the wind farm or from hard bottom substrates was found on the fish densities at Horns Rev Wind Farm at the time of the survey. The execution of the field

  20. Combining telephone surveys and fishing catches self-report: the French sea bass recreational fishery assessment.

    Directory of Open Access Journals (Sweden)

    Delphine Rocklin

    Full Text Available Fisheries statistics are known to be underestimated, since they are mainly based on information about commercial fisheries. However, various types of fishing activities exist and evaluating them is necessary for implementing effective management plans. This paper assesses the characteristics and catches of the French European sea bass recreational fishery along the Atlantic coasts, through the combination of large-scale telephone surveys and fishing diaries study. Our results demonstrated that half of the total catches (mainly small fish were released at sea and that the mean length of a kept sea bass was 46.6 cm. We highlighted different patterns of fishing methods and type of gear used. Catches from boats were greater than from the shore, both in abundance and biomass, considering mean values per fishing trip as well as CPUE. Spearfishers caught the highest biomass of sea bass per fishing trip, but the fishing rod with lure was the most effective type of gear in terms of CPUE. Longlines had the highest CPUE value in abundance but not in biomass: they caught numerous but small sea bass. Handlines were less effective, catching few sea bass in both abundance and biomass. We estimated that the annual total recreational sea bass catches was 3,173 tonnes of which 2,345 tonnes were kept. Since the annual commercial catches landings were evaluated at 5,160 tonnes, recreational landings represent 30% of the total fishing catches on the Atlantic coasts of France. Using fishers' self-reports was a valuable way to obtain new information on data-poor fisheries. Our results underline the importance of evaluating recreational fishing as a part of the total amount of fisheries catches. More studies are critically needed to assess overall fish resources caught in order to develop effective fishery management tools.

  1. 77 FR 56813 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2012-09-14

    ... Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... SEDAR process and assessment schedule. See SUPPLEMENTARY INFORMATION. DATES: The SEDAR Steering....net . SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico, and Caribbean Fishery Management...

  2. 78 FR 24730 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-04-26

    ... National Oceanic and Atmospheric Administration RIN 0648-XC642 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR 33 Gulf of Mexico...

  3. 76 FR 2889 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2011-01-18

    ... Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... Atlantic Fishery Management Council, 4055 Faber Place Drive 201, North Charleston, SC 29405; Gulf of Mexico.... SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico, and Caribbean Fishery Management Councils; in...

  4. 78 FR 54869 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2013-09-06

    ... National Oceanic and Atmospheric Administration RIN 0648-XC846 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR 33 Gulf of Mexico...

  5. 78 FR 10607 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting...

    Science.gov (United States)

    2013-02-14

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration RIN 0648-XC491 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting; Correction AGENCY: National Marine Fisheries...

  6. Dworshak Dam Impact (Impacts) Assessment and Fishery Investigation.

    Energy Technology Data Exchange (ETDEWEB)

    Mauser, Gregg

    1989-05-01

    Kokanee abundance, estimated from July trawl data, was 1.2 million fish in 1988, including 553,000 fry, 501,000 yearlings and 156,000 subadults. Spawning trend data indicated escapement was up threefold compared to 1987, despite a sport harvest of 207,000 kokanee averaging 258 mm caught at a rate of 1.5 fish per hour. An estimated 40,000 kokanee were counted during the September peak of spawning in five tributaries of the reservoir. Size of adult fish was below average at 293 mm. Zooplankton densities averaged 10.3 organisms/L in 1988 and ranged from 0.3 organisms/L during April at the Little North Fork station to 26.2 organisms/L in November at the Elk Creek station. Densities were similar to values obtained prior to the development of the primary kokanee fishery; however, cladocerans made up only 34.9% of the zooplankton sampled. Daphnia and Cyclops were the most important food items; Daphnia became the prime food organism as its seasonal abundance increased. Concentrations of ortho-phosphate and nitrate, lower than in the 1970s, indicated Dworshak may have become more oligotrophic. 13 refs., 24 figs., 4 tabs.

  7. Chinook Salmon Adult Abundance Monitoring; Hydroacoustic Assessment of Chinook Salmon Escapement to the Secesh River, Idaho, 2002-2004 Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, R.; McKinstry, C.; Mueller, R.

    2004-01-01

    Accurate determination of adult salmon spawner abundance is key to the assessment of recovery actions for wild Snake River spring/summer Chinook salmon (Onchorynchus tshawytscha), a species listed as 'threatened' under the Endangered Species Act (ESA). As part of the Bonneville Power Administration Fish and Wildlife Program, the Nez Perce Tribe operates an experimental project in the South Fork of the Salmon River subbasin. The project has involved noninvasive monitoring of Chinook salmon escapement on the Secesh River between 1997 and 2000 and on Lake Creek since 1998. The overall goal of this project is to accurately estimate adult Chinook salmon spawning escapement numbers to the Secesh River and Lake Creek. Using time-lapse underwater video technology in conjunction with their fish counting stations, Nez Perce researchers have successfully collected information on adult Chinook salmon spawner abundance, run timing, and fish-per-redd numbers on Lake Creek since 1998. However, the larger stream environment in the Secesh River prevented successful implementation of the underwater video technique to enumerate adult Chinook salmon abundance. High stream discharge and debris loads in the Secesh caused failure of the temporary fish counting station, preventing coverage of the early migrating portion of the spawning run. Accurate adult abundance information could not be obtained on the Secesh with the underwater video method. Consequently, the Nez Perce Tribe now is evaluating advanced technologies and methodologies for measuring adult Chinook salmon abundance in the Secesh River. In 2003, the use of an acoustic camera for assessing spawner escapement was examined. Pacific Northwest National Laboratory, in a collaborative arrangement with the Nez Perce Tribe, provided the technical expertise to implement the acoustic camera component of the counting station on the Secesh River. This report documents the first year of a proposed three-year study to determine

  8. Chinook Salmon Adult Abundance Monitoring; Hydroacoustic Assessment of Chinook Salmon Escapement to the Secesh River, Idaho, 2002-2004 Final Report.

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, R.; McKinstry, C.; Mueller, R.

    2004-01-01

    Accurate determination of adult salmon spawner abundance is key to the assessment of recovery actions for wild Snake River spring/summer Chinook salmon (Onchorynchus tshawytscha), a species listed as 'threatened' under the Endangered Species Act (ESA). As part of the Bonneville Power Administration Fish and Wildlife Program, the Nez Perce Tribe operates an experimental project in the South Fork of the Salmon River subbasin. The project has involved noninvasive monitoring of Chinook salmon escapement on the Secesh River between 1997 and 2000 and on Lake Creek since 1998. The overall goal of this project is to accurately estimate adult Chinook salmon spawning escapement numbers to the Secesh River and Lake Creek. Using time-lapse underwater video technology in conjunction with their fish counting stations, Nez Perce researchers have successfully collected information on adult Chinook salmon spawner abundance, run timing, and fish-per-redd numbers on Lake Creek since 1998. However, the larger stream environment in the Secesh River prevented successful implementation of the underwater video technique to enumerate adult Chinook salmon abundance. High stream discharge and debris loads in the Secesh caused failure of the temporary fish counting station, preventing coverage of the early migrating portion of the spawning run. Accurate adult abundance information could not be obtained on the Secesh with the underwater video method. Consequently, the Nez Perce Tribe now is evaluating advanced technologies and methodologies for measuring adult Chinook salmon abundance in the Secesh River. In 2003, the use of an acoustic camera for assessing spawner escapement was examined. Pacific Northwest National Laboratory, in a collaborative arrangement with the Nez Perce Tribe, provided the technical expertise to implement the acoustic camera component of the counting station on the Secesh River. This report documents the first year of a proposed three-year study to determine

  9. Integrating Fisheries Dependent and Independent Approaches to assess Fisheries, Abundance, Diversity, Distribution and Genetic Connectivity of Red Sea Elasmobranch Populations

    KAUST Repository

    Spaet, Julia L.

    2014-05-01

    The Red Sea has long been recognized as a global hotspot of marine biodiversity. Ongoing overfishing, however, is threatening this unique ecosystem, recently leading to the identification of the Red Sea as one of three major hotspots of extinction risk for sharks and rays worldwide. Elasmobranch catches in Saudi Arabian Red Sea waters are unregulated, often misidentified and unrecorded, resulting in a lack of species-specific landings information, which would be vital for the formulation of effective management strategies. Here we employed an integrated approach of fisheries dependent and independent survey methods combined with molecular tools to provide biological, ecological and fisheries data to aid in the assessment of the status of elasmobranch populations in the Red Sea. Over the course of two years, we conducted market surveys at the biggest Saudi Arabian fish market in Jeddah. Market landings were dominated by, mostly immature individuals - implying both recruitment and growth overfishing. Additionally, we employed baited remote underwater video (BRUVS) and longline surveys along almost the entire length of the Red Sea coast of Saudi Arabia as well as at selected reef systems in Sudan. The comparison of catch per unit effort (CPUE) data for Saudi Arabian Red Sea BRUVS and longline surveys to published data originating from non-Red Sea ocean systems revealed CPUE values several orders of magnitude lower for both survey methods in the Red Sea compared to other locations around the world. Finally, we infered the regional population structure of four commercially important shark species between the Red Sea and the Western Indian Ocean.We genotyped nearly 2000 individuals at the mitochondrial control region as well as a total of 20 microsatellite loci. Genetic homogeneity could not be rejected for any of the four species across the spatial comparison. Based on high levels of region-wide exploitation, we suggest that, for management purposes, the population

  10. Strategic Assessment of Fisheries Independent Monitoring Programs in the Gulf of Mexico

    Science.gov (United States)

    Suprenand, Paul Mark; Drexler, Michael; Jones, David L.; Ainsworth, Cameron H.

    2015-01-01

    This study evaluates information produced from 14 fisheries independent monitoring programs (FIM) in the Gulf of Mexico. We consider the uniqueness of information from each program and its usefulness in estimating fisheries management indices. Biomass values of 35 functional groups are extracted from an operating model (Ecospace) with a method that replicates the patterns of historic FIM samplings. Observation error is added to these data in order to create a set of pseudo data that replicate the type and quality of information obtained from FIM programs. The pseudo data were put into a separate fishery assessment model (Pella-Tomlinson) to determine management indices of each functional group (maximum sustainable yield (MSY), biomass at MSY, and fishing mortality at MSY). These indices are compared against values in Ecospace, and against previously published single-species stock assessments. We also evaluate the full suite of information derived from FIM within an ecosystem context, considering whether functional roles are over- or under-sampled, and whether sampling effort is proportional to the value of fish stocks. Results reveal that model derived fishery indices closely matched published indices for the majority of the functional groups, economic and ecological evaluation suggests that several piscivorous functional groups are under-sampled include forage base species that are likely to indirectly support fisheries for piscivores, and sampling efforts are not proportional to the value of some fish stocks. Following ecological modelling we performed statistical analyses on historic FIM catch data to identify optimal species-specific sampling months and gear-types that can be used to refine future FIM sampling efforts. PMID:25835742

  11. Scientific, Technical and Economic Committee for Fisheries (STECF) – Black Sea assessments (STECF-15-16).

    OpenAIRE

    2015-01-01

    The Expert Working Group meeting of the Scientific, Technical and Economic Committee for Fisheries EWG 15-12 was held from 28 Sep-02 Oct 2015 in Ispra, Italy to assess the status of Black Sea against the proposed FMSY reference points. The meeting was preceded by a two-day data preparatory meeting held at JRC premises during 24-25 Sep 2015. The report was reviewed by written procedure in October 2015.

  12. New methods for impact assessment of biotic-resource depletion in life cycle assessment of fisheries : theory and application

    OpenAIRE

    2014-01-01

    It is difficult to address all of the direct environmental impacts of fisheries using conventional methods of Life Cycle Assessment (LCA). A methodological framework was developed that calculates regionalised characterisation factors for biomass uptake by fishing activities to assess impacts of biotic-resource depletion at both species and ecosystem levels. These two levels were studied to include effects of catch on the collapse of a particular stock of a given species and on total biomass a...

  13. Hydroacoustic Estimates of Fish Density Distributions in Cougar Reservoir, 2011

    Energy Technology Data Exchange (ETDEWEB)

    Ploskey, Gene R.; Zimmerman, Shon A.; Hennen, Matthew J.; Batten, George W.; Mitchell, T. D.

    2012-09-01

    Day and night mobile hydroacoustic surveys were conducted once each month from April through December 2011 to quantify the horizontal and vertical distributions of fish throughout Cougar Reservoir, Lane County, Oregon.

  14. Nearshore Hydroacoustic Seafloor Mapping In The German Bight (North Sea): Hydroacoustic Interpretation With And Without Classification

    Science.gov (United States)

    Hass, H. C.; Mielck, F.; Papenmeier, S.

    2016-12-01

    Nearshore habitats are in constant dynamic change. They need regular assessment and appropriate monitoring of areas of special interest. To accomplish this, hydroacoustic seabed characterization tools are applied to allow for cost-effective and efficient mapping of the seafloor. In this context single beam echosounders (SBES) systems provide a comprehensive view by analyzing the hardness and roughness characteristics of the seafloor. Interpolation between transect lines becomes necessary when gapless maps are needed. This study presents a simple method to process and visualize data recorded with RoxAnn (Sonavision, Edinburgh, UK) and similar SBES. Both, hardness and roughness data are merged to one combined parameter that receives a color code (RGB) according to the acoustic properties of the seafloor. This color information is then interpolated to obtain an area-wide map that provides unclassified and thus unbiased seabed information. The RGB color data can subsequently be used for classification and modeling purposes. Four surveys are shown from a morphologically complex nearshore area west of the island of Helgoland (SE North Sea). The area has complex textural and dynamic characteristics reaching from outcropping bedrock via sandy to muddy areas with mostly gradual transitions. RoxAnn data allow to discriminate all seafloor types that were suggested by ground-truth information (seafloor samples, video). The area appears to be fluctuating within certain limits. Sediment import (sand and fluid mud) paths can be reconstructed. Manually, six RoxAnn zones (RZ) were identified and left without hard boundaries to better match the seafloor types of the study site. The k-means fuzzy cluster analysis employed yields best results with 3 classes. We show that interpretations on the basis of largely non-classified, color-coded and interpolated data provide the best gain of information in the highest possible resolution. Classification with hard boundaries is necessary for

  15. 75 FR 70216 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-11-17

    ... National Oceanic and Atmospheric Administration RIN 0648-XA042 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Assessment Process Webinar for Highly Migratory... of sandbar, dusky, and blacknose sharks assessment webinar. SUMMARY: The SEDAR 21 assessments of the...

  16. 75 FR 25208 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-05-07

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings AGENCY: National Marine Fisheries... 24 South Atlantic red snapper assessment webinars 1 and 2. ] SUMMARY: The SEDAR 24 assessment of the..., a series of Assessment webinars, and a Review Workshop. See SUPPLEMENTARY INFORMATION. DATES: SEDAR...

  17. Determining threat status for data-limited fisheries based on catch-only stock assessment models

    OpenAIRE

    Weir, Lauren Hadfield

    2017-01-01

    Catch-only stock assessment methods have been developed to manage data-limited fisheries where only catch data is available. This research evaluated the ability of four catch-only stock assessment methods to correctly classify a stock of concern based on population trends. To accomplish this, true trends from simulated stocks and the trends produced by the models were used to classify stocks into threat categories based on percent change. ROC curves and PR curves were then used to test the ef...

  18. Quantitative assessment of a data-limited recreational bonefish fishery using a time-series of fishing guides reports.

    Science.gov (United States)

    Santos, Rolando O; Rehage, Jennifer S; Adams, Aaron J; Black, Brooke D; Osborne, Jason; Kroloff, Emily K N

    2017-01-01

    Recreational fisheries can be prone to severe declines, yet these fisheries, particularly catch-and-release, are often data-limited, constraining our ability to conduct stock assessments. A combination of catch and effort indices derived from fisheries-dependent data (FDD) gathered from fishing logbooks could be a powerful approach to inform these data gaps. This study demonstrates the utility of using different catch metrics such as indices of abundance, species richness associated with reported catch, and the success rate of targeted trips, to assess historical shifts in the trajectory of the data-limited bonefish (Albula vulpes) fishery in Florida Bay, an economically-important recreational fishery within the Caribbean Basin. We used FDD from fishing guide reports submitted to Everglades National Park to determine temporal patterns in the bonefish population over the past 35 years. These reports indicated a decline in recreational catches in Florida Bay since the late 1980s, with an accelerated decline starting in the late 1990s-early 2000s. Analyses showed an overall 42% reduction in bonefish catches. Trends in the proportion of positive trips (i.e., the probability of catching success) followed the declining catch patterns, suggesting major population changes starting in 1999-2000. As bonefish catches declined, species richness in bonefish trips increased by 34%, suggesting a decrease in bonefish abundance and/or shift in fishing effort (e.g., giving-up time, changes in preferred species). Results provide additional resolution to a pattern of decline for bonefish in South Florida and highlight the value of reconstructing time-series for the development of hypotheses about the potential driving mechanisms of species decline. Further, the data-limited nature of most recreational fisheries, and the increase in a use of catch-and-release as a fisheries management strategy point to the need to develop further data integration tools to assess population trends and

  19. 75 FR 47265 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) update; greater...

    Science.gov (United States)

    2010-08-05

    ... Assessment Webinar I for Gulf of Mexico greater amberjack. SUMMARY: The SEDAR update of the assessment of the Gulf of Mexico stock of greater amberjack will consist of a series of webinars. This assessment will... National Oceanic and Atmospheric Administration RIN: 0648-XX99 Fisheries of the Gulf of Mexico; Southeast...

  20. 75 FR 62506 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-10-12

    ... National Oceanic and Atmospheric Administration RIN 0648-XY43 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Assessment Process Webinars for Highly Migratory... of addendum to a meeting notice for SEDAR 21 HMS of sandbar, dusky, and blacknose sharks assessment...

  1. 77 FR 27716 - Fishery of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2012-05-11

    ... National Oceanic and Atmospheric Administration Fishery of the Gulf of Mexico; Southeast Data, Assessment... and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR 31 Gulf of Mexico red snapper (Lutjanus Campechanus) data scoping assessment process webinar. SUMMARY: The SEDAR 31 assessment of the Gulf...

  2. An assessment of West African seahorses in fisheries catch and trade.

    Science.gov (United States)

    Cisneros-Montemayor, A M; West, K; Boiro, I S; Vincent, A C J

    2016-02-01

    This study provides the first assessment of a heavily traded West African seahorse species, Hippocampus algiricus, and the first information on short-snouted seahorse Hippocampus hippocampus biology in Africa. A total of 219 seahorses were sampled from fisher catch in Senegal and The Gambia, with estimated height at reproductive activity for H. algiricus (161 mm) larger than mean ± S.D. catch height (150 ± 31 mm). Catch composition, height at reproductive activity and potential biases in fishery retention are discussed with regard to the current Convention on International Trade of Endangered Species (CITES) guidelines.

  3. Assessment of sábalo (Prochilodus lineatus fisheries in the lower Paraná River basin (Argentina based on hydrological, biological, and fishery indicators

    Directory of Open Access Journals (Sweden)

    Claudio Baigún

    Full Text Available This study assesses the change in fish exploitation patterns of the sábalo fisheries of the lower Paraná River basin based on hydrological, biological, and fishery indicators. From historical catch records, we recorded a shift from a lightly and moderate exploited status before 2001 to a heavily exploited one, as a result of the development of sábalo exports from 2001 onwards. Channel and floodplain connectivity indices demonstrated that the Paraná exhibited highly favorable hydrological conditions between 1972 and 1999 but more adverse conditions from 1999 to 2009, as a consequence of flood pulses reduction coincident with a fishing mortality increment. A total catch of 15,000 tons, including local consumption, regional market, informal sales, and exportation volumes, was estimated as the maximum sustainable catch. That level was instead exceeded 3 fold in 2004, in parallel with a decrease in the mean fish length from 48 to 42 cm, along with a reduction in both the mesh size from 16 to 12 cm and megaspawner proportion, and an increase of fishing mortality. Although growth overfishing was not noted, an analysis of the spawning potential ratio trend indicated that recruitment overfishing took place during 2005, since the fishing mortality rate was 4 times greater than the natural mortality rate. These observations suggest that less favorable hydrological conditions after 1999 coupled with a coincident high fishing pressure could have impacted the sábalo population biomass. Management of sábalo fisheries requires to set aside a single economic vision of the resource use moving to an ecosystem-oriented approach that incorporate, among others components, the hydrological regime, species life history traits, fishing impacts on other species, and main stakeholders socioeconomic requirements as key elements for the preservation of fishery sustainability.

  4. An Applied Framework for Incorporating Multiple Sources of Uncertainty in Fisheries Stock Assessments.

    Directory of Open Access Journals (Sweden)

    Finlay Scott

    Full Text Available Estimating fish stock status is very challenging given the many sources and high levels of uncertainty surrounding the biological processes (e.g. natural variability in the demographic rates, model selection (e.g. choosing growth or stock assessment models and parameter estimation. Incorporating multiple sources of uncertainty in a stock assessment allows advice to better account for the risks associated with proposed management options, promoting decisions that are more robust to such uncertainty. However, a typical assessment only reports the model fit and variance of estimated parameters, thereby underreporting the overall uncertainty. Additionally, although multiple candidate models may be considered, only one is selected as the 'best' result, effectively rejecting the plausible assumptions behind the other models. We present an applied framework to integrate multiple sources of uncertainty in the stock assessment process. The first step is the generation and conditioning of a suite of stock assessment models that contain different assumptions about the stock and the fishery. The second step is the estimation of parameters, including fitting of the stock assessment models. The final step integrates across all of the results to reconcile the multi-model outcome. The framework is flexible enough to be tailored to particular stocks and fisheries and can draw on information from multiple sources to implement a broad variety of assumptions, making it applicable to stocks with varying levels of data availability The Iberian hake stock in International Council for the Exploration of the Sea (ICES Divisions VIIIc and IXa is used to demonstrate the framework, starting from length-based stock and indices data. Process and model uncertainty are considered through the growth, natural mortality, fishing mortality, survey catchability and stock-recruitment relationship. Estimation uncertainty is included as part of the fitting process. Simple model

  5. An Applied Framework for Incorporating Multiple Sources of Uncertainty in Fisheries Stock Assessments.

    Science.gov (United States)

    Scott, Finlay; Jardim, Ernesto; Millar, Colin P; Cerviño, Santiago

    2016-01-01

    Estimating fish stock status is very challenging given the many sources and high levels of uncertainty surrounding the biological processes (e.g. natural variability in the demographic rates), model selection (e.g. choosing growth or stock assessment models) and parameter estimation. Incorporating multiple sources of uncertainty in a stock assessment allows advice to better account for the risks associated with proposed management options, promoting decisions that are more robust to such uncertainty. However, a typical assessment only reports the model fit and variance of estimated parameters, thereby underreporting the overall uncertainty. Additionally, although multiple candidate models may be considered, only one is selected as the 'best' result, effectively rejecting the plausible assumptions behind the other models. We present an applied framework to integrate multiple sources of uncertainty in the stock assessment process. The first step is the generation and conditioning of a suite of stock assessment models that contain different assumptions about the stock and the fishery. The second step is the estimation of parameters, including fitting of the stock assessment models. The final step integrates across all of the results to reconcile the multi-model outcome. The framework is flexible enough to be tailored to particular stocks and fisheries and can draw on information from multiple sources to implement a broad variety of assumptions, making it applicable to stocks with varying levels of data availability The Iberian hake stock in International Council for the Exploration of the Sea (ICES) Divisions VIIIc and IXa is used to demonstrate the framework, starting from length-based stock and indices data. Process and model uncertainty are considered through the growth, natural mortality, fishing mortality, survey catchability and stock-recruitment relationship. Estimation uncertainty is included as part of the fitting process. Simple model averaging is used to

  6. Assessing the Impact of Policy Changes in the Icelandic Cod Fishery Using a Hybrid Simulation Model

    Directory of Open Access Journals (Sweden)

    Sigríður Sigurðardóttir

    2014-01-01

    Full Text Available Most of the Icelandic cod is caught in bottom trawlers or longliners. These two fishing methods are fundamentally different and have different economic, environmental, and even social effects. In this paper we present a hybrid-simulation framework to assess the impact of changing the ratio between cod quota allocated to vessels with longlines and vessels with bottom trawls. It makes use of conventional bioeconomic models and discrete event modelling and provides a framework for simulating life cycle assessment (LCA for a cod fishery. The model consists of two submodels, a system dynamics model describing the biological aspect of the fishery and a discrete event model for fishing activities. The model was run multiple times for different quota allocation scenarios and results are presented where different scenarios are presented in the three dimensions of sustainability: environmental, social, and economic. The optimal allocation strategy depends on weighing the three different factors. The results were encouraging first-steps towards a useful modelling method but the study would benefit greatly from better data on fishing activities.

  7. Assessing the impact of policy changes in the Icelandic cod fishery using a hybrid simulation model.

    Science.gov (United States)

    Sigurðardóttir, Sigríður; Johansson, Björn; Margeirsson, Sveinn; Viðarsson, Jónas R

    2014-01-01

    Most of the Icelandic cod is caught in bottom trawlers or longliners. These two fishing methods are fundamentally different and have different economic, environmental, and even social effects. In this paper we present a hybrid-simulation framework to assess the impact of changing the ratio between cod quota allocated to vessels with longlines and vessels with bottom trawls. It makes use of conventional bioeconomic models and discrete event modelling and provides a framework for simulating life cycle assessment (LCA) for a cod fishery. The model consists of two submodels, a system dynamics model describing the biological aspect of the fishery and a discrete event model for fishing activities. The model was run multiple times for different quota allocation scenarios and results are presented where different scenarios are presented in the three dimensions of sustainability: environmental, social, and economic. The optimal allocation strategy depends on weighing the three different factors. The results were encouraging first-steps towards a useful modelling method but the study would benefit greatly from better data on fishing activities.

  8. 78 FR 16472 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-03-15

    ... Gag and Greater Amberjack Data Scoping Webinar. SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico... data determined to be pertinent in the assessment for Gulf of Mexico gag and greater amberjack prior to... National Oceanic and Atmospheric Administration RIN 0648-XC565 Fisheries of the Gulf of Mexico; Southeast...

  9. 78 FR 34348 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting

    Science.gov (United States)

    2013-06-07

    ... Gag and Greater Amberjack webinar. SUMMARY: The SEDAR 33 assessment of the Gulf of Mexico stocks of... inputs for the stock assessments of Gulf of Mexico Gag and Greater Amberjack. Although non-emergency... National Oceanic and Atmospheric Administration RIN 0648-XC716 Fisheries of the Gulf of Mexico; Southeast...

  10. 76 FR 52638 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2011-08-23

    ... National Oceanic and Atmospheric Administration RIN 0648-XA654 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Review Workshop for Gulf of Mexico Menhaden and... technical stock assessments of the Gulf of Mexico stock of menhaden and the southeast U.S. stocks of...

  11. 77 FR 2960 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Pre-Workshop...

    Science.gov (United States)

    2012-01-20

    ... National Oceanic and Atmospheric Administration RIN 0648-XA942 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Pre-Workshop Webinar for HMS Blacktip Sharks AGENCY: National...: Notice of SEDAR 29 pre-workshop webinar for HMS blacktip sharks. SUMMARY: The SEDAR assessment of the HMS...

  12. 75 FR 4535 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); data workshop...

    Science.gov (United States)

    2010-01-28

    ... SEDAR assessments of the Gulf of Mexico stocks of yellowedge grouper and tilefish will consist of a... National Oceanic and Atmospheric Administration RIN 0648-XU07 Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); data workshop for yellowedge grouper and tilefish. AGENCY...

  13. 78 FR 76595 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2013-12-18

    ... National Oceanic and Atmospheric Administration RIN 0648-XD034 Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Data Webinar for Gulf of Mexico and South... King Mackerel. SUMMARY: The SEDAR assessment of the Gulf of Mexico and South Atlantic King Mackerel...

  14. 75 FR 31424 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2010-06-03

    ... Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR) Steering Committee Meeting AGENCY... conference call to discuss assessment projects for 2011. SEE SUPPLEMENTARY INFORMATION. DATES: The SEDAR... Atlantic Fishery Management Council, 4055 Faber Place Drive 201, North Charleston, SC 29405; Gulf of Mexico...

  15. 75 FR 12506 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-03-16

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine Fisheries... Workshop for South Atlantic and Gulf of Mexico goliath grouper. SUMMARY: The SEDAR assessments of the South Atlantic and Gulf of Mexico stocks of goliath grouper will consist of a series of three workshops: a Data...

  16. Assessment of the Fishery Improvement Opportunities on the Pend Oreille River, 1988 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Barber, Michael R.; Willms, Roger A.; Scholz, Allan T.

    1989-10-01

    The purpose of this study is to assess the fishery improvement opportunities on the Box Canyon portion of the Pend Oreille River. This report contains the findings of the first year of the study. Chinook salmon (Oncorhynchus tshawytscha (Walbaum)) and steelhead (Oncorhynchus mykiss (Richardson)) were present in the Pend Oreille River prior to the construction of Grand Coulee Dam. The river also contained native cutthroat trout (Oncorhynchus clarki (Richardson)), bull trout (Salvelinus confluentus (Walbaum)) and mountain whitefish (Prosopium williamsoni (Girard)). Rainbow trout were planted in the river and some grew to lengths in excess of 30 inches. With the construction of Box Canyon Dam, in 1955, the most productive section of the river was inundated. Following the construction of the dam the trout fishery declined and the populations of spiny ray fish and rough fish increased. The objectives of the first year of the study were to determine the relative abundance of each species in the river and sloughs; the population levels in fish in the river and four selected tributaries; fish growth rates; the feeding habits and abundance of preferred prey; the migration patterns; and the total fishing pressure, catch per unit effort, and total harvest by conducting a year-round creel survey. 132 refs.

  17. Coral Patch seamount (NE Atlantic) - a sedimentological and megafaunal reconnaissance based on video and hydroacoustic surveys

    Science.gov (United States)

    Wienberg, C.; Wintersteller, P.; Beuck, L.; Hebbeln, D.

    2013-05-01

    The present study provides new knowledge about the so far largely unexplored Coral Patch seamount which is located in the NE Atlantic Ocean half-way between the Iberian Peninsula and Madeira. For the first time a detailed hydroacoustic mapping (MBES) in conjunction with video surveys (ROV, camera sled) were performed to describe the sedimentological and biological characteristics of this sub-elliptical ENE-WSW elongated seamount. Video observations were restricted to the southwestern summit area of Coral Patch seamount (water depth: 560-760 m) and revealed that this part of the summit is dominated by exposed hard substrate, whereas soft sediment is just a minor substrate component. Although exposed hardgrounds are dominant for this summit area and, thus, offer suitable habitat for settlement by benthic organisms, the benthic megafauna shows rather scarce occurrence. In particular, scleractinian framework-building cold-water corals are apparently rare with very few isolated and small-sized live occurrences of the species Lophelia pertusa and Madrepora oculata. In contrast, dead coral framework and coral rubble are more frequent pointing to a higher abundance of cold-water corals on Coral Patch during the recent past. This is even supported by the observation of fishing lines that got entangled with rather fresh-looking coral frameworks. Overall, long lines and various species of commercially important fish were frequently observed emphasising the potential of Coral Patch as an important target for fisheries that may have impacted the entire benthic community. Hydroacoustic seabed classification covered the entire summit of Coral Patch and its northern and southern flanks (water depth: 560-2660 m) and revealed extended areas dominated by mixed and soft sediments at the northern flank and to a minor degree at its easternmost summit and southern flank. Nevertheless, these data also predict most of the summit area to be dominated by exposed bedrock which would offer

  18. Coral Patch seamount (NE Atlantic) - a sedimentological and macrofaunal reconnaissance based on video and hydroacoustic surveys

    Science.gov (United States)

    Wienberg, C.; Wintersteller, P.; Beuck, L.; Hebbeln, D.

    2012-12-01

    The present study provides new knowledge about the so far largely unexplored Coral Patch seamount which is located in the NE Atlantic Ocean half-way between the Iberian Peninsula and Madeira. For the first time a detailed hydroacoustic mapping (MBES) in conjunction with video surveys (ROV, camera sled) were performed to describe the sedimentological and biological characteristics of this sub-elliptical ENE-WSW elongated seamount. Video observations were restricted to the south-western summit area of Coral Patch seamount (area: ~ 8 km2, water depth: 560-760 m) and revealed that this part of the summit is dominated by exposed hard substrate, whereas soft sediment is just a minor substrate component. Although exposed hardgrounds are dominant for this summit area, and thus, offer suitable habitat for settlement by benthic organisms, the macrofauna shows rather low abundance and diversity. In particular, scleractinian framework-building cold-water corals are apparently rare with very few isolated and small-sized live occurrences of the species Lophelia pertusa and Madrepora oculata. In contrast, dead coral framework and coral rubble are more frequent pointing to a higher abundance of cold-water corals on Coral Patch during the recent past. This is even supported by the observation of fishing lines that got entangled with rather fresh-looking coral frameworks. Overall, long lines and various species of commercially important fish were frequently observed emphasising the potential of Coral Patch as an important target for fisheries that may have impacted the entire benthic community. Hydroacoustic seabed classification covered the entire summit of Coral Patch and its northern and southern flanks (area: 560 km2; water depth: 560-2660 m) and revealed extended areas dominated by mixed and soft sediments at the northern flank and to a minor degree at its easternmost summit and southern flank. Nevertheless, also these data predict most of the summit area to be dominated by

  19. By-catch impacts in fisheries: utilizing the IUCN red list categories for enhanced product level assessment in seafood LCAs.

    Science.gov (United States)

    Hornborg, Sara; Svensson, Mikael; Nilsson, Per; Ziegler, Friederike

    2013-11-01

    Overexploitation of fish stocks causes concern not only to fisheries managers and conservation biologists, but also engages seafood consumers; more integrated product perspectives would be useful. This could be provided by life cycle assessment (LCA); however, further complements of present LCA methodology are needed to assess seafood production, one being by-catch impacts. We studied the scientific rationale behind using the IUCN Red List of Threatened Species™ for assessment of impacts relating to fish species' vulnerability. For this purpose, the current Red List status of marine fish in Sweden was compared to the advice given in fisheries as well as key life history traits known to indicate sensitivity to high fishing pressure. Further, we quantified the amount of threatened fish (vulnerable, endangered, or critically endangered) that was discarded in demersal trawl fisheries on the Swedish west coast. The results showed that not only did the national Red List of marine fish have a high consistency with advice given in fisheries and indices of vulnerability, the different fishing practices studied were also found to have vastly different amounts of threatened fish discarded per kilo landing. The suggested approach is therefore promising as a carrier of aggregated information on the extent to which seafood production interferes with conservation priorities, in particular for species lacking adequate stock assessment. To enable extensive product comparisons, it is important to increase coverage of fish species by the global IUCN Red List, and to reconsider the appropriate assessment unit (species or stocks) in order to avoid false alarms.

  20. By-Catch Impacts in Fisheries: Utilizing the IUCN Red List Categories for Enhanced Product Level Assessment in Seafood LCAs

    Science.gov (United States)

    Hornborg, Sara; Svensson, Mikael; Nilsson, Per; Ziegler, Friederike

    2013-11-01

    Overexploitation of fish stocks causes concern not only to fisheries managers and conservation biologists, but also engages seafood consumers; more integrated product perspectives would be useful. This could be provided by life cycle assessment (LCA); however, further complements of present LCA methodology are needed to assess seafood production, one being by-catch impacts. We studied the scientific rationale behind using the IUCN Red List of Threatened Species™ for assessment of impacts relating to fish species’ vulnerability. For this purpose, the current Red List status of marine fish in Sweden was compared to the advice given in fisheries as well as key life history traits known to indicate sensitivity to high fishing pressure. Further, we quantified the amount of threatened fish (vulnerable, endangered, or critically endangered) that was discarded in demersal trawl fisheries on the Swedish west coast. The results showed that not only did the national Red List of marine fish have a high consistency with advice given in fisheries and indices of vulnerability, the different fishing practices studied were also found to have vastly different amounts of threatened fish discarded per kilo landing. The suggested approach is therefore promising as a carrier of aggregated information on the extent to which seafood production interferes with conservation priorities, in particular for species lacking adequate stock assessment. To enable extensive product comparisons, it is important to increase coverage of fish species by the global IUCN Red List, and to reconsider the appropriate assessment unit (species or stocks) in order to avoid false alarms.

  1. Assessment of the Fishery Improvement Opportunities on the Pend Oreille River, Appendices, 1990 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Ashe, Becky L.; Lillengreen, Kelly L.; Vella, John J.

    1991-03-01

    This report is a compilation of the seven appendices to DOE/BP/39339--4 the annual report for FY 1990. These appendices contain the supporting numerical data for the study. The purpose of this study was to assess the fishery improvement opportunities on the Box Canyon portion of the Pend Oreilla River. This three year study was initiated as part of the Northwest Power Planning Council's 1987 Columbia River Basin Fish and Wildlife Program. This report contains the findings of the third and final year of the study. The objectives of the third year of the study were to determine the relative abundance of each species in the river and sloughs; the population levels in five selected tributaries and, if possible, for fish in the river and sloughs; each species growth rate, feeding habits, abundance of preferred prey, and migration patterns; and the seasonal movement patterns and habitat utilization of largemouth bass.

  2. Manual on sample-based data collection for fisheries assessment : Examples from Viet Nam

    DEFF Research Database (Denmark)

    Sparre, Per Johan

    This manual deals with the practical implementation of a routine data collection programme. This programme is developed through a top-down approach, from the identification of the objectives down to the practical recording and management of data obtained from the fishery. The issues are dealt...... with through both detailed discussion and by using simple examples. These examples are mostly based on situations in tropical fisheries and, in particular, experience has been drawn from developing a data collection programme in Viet Nam. The main questions addressed in the manual are which fisheries data...... to collect, where and when to collect them. Only data collected from commercial marine capture fisheries are considered (data from freshwater fisheries, cultured fish and experimental fisheries are excluded). The methodologies used are mainly appropriate for a tropical developing country with many small...

  3. Fisheries economics and fisheries management

    DEFF Research Database (Denmark)

    Andersen, Peder

    2013-01-01

    spent too much time on fundamentals in fisheries economics at the expense of the development of applicable models for fisheries managers? Of course, this question is relevant only IF fisheries economics and fisheries economists have a role to play in fisheries management.......Professor Rögnvaldur Hannesson's influence on the development and history of fisheries economics is unquestionable. Also, he has strongly pointed out the potential gains from a more active use of fisheries economics in fisheries management. In light of this, one may ask if fisheries economists have...

  4. Evolutionary impact assessment: accounting for evolutionary consequences of fishing in an ecosystem approach to fisheries management

    OpenAIRE

    Laugen, A T; Engelhard, G.H.; Whitlock, R.; Arlinghaus, R; Dankel, D.J.; Dunlop, E.S.; Eikeset, A. M.; Enberg, K; Jørgensen, C.; MATSUMURA, S.; Nusslé, S.; Urbach, D.; Baulier, L.; Boukal, D.S.; Ernande, B.

    2014-01-01

    Managing fisheries resources to maintain healthy ecosystems is one of the main goals of the ecosystem approach to fisheries (EAF). While a number of international treaties call for the implementation of EAF, there are still gaps in the underlying methodology. One aspect that has received substantial scientific attention recently is fisheries-induced evolution (FIE). Increasing evidence indicates that intensive fishing has the potential to exert strong directional selection on life-history tra...

  5. Evolutionary impact assessment: accounting for evolutionary consequences of fishing in an ecosystem approach to fisheries management

    OpenAIRE

    Laugen, A T; Engelhard, G.H.; Dieckmann, U.

    2012-01-01

    Managing fisheries resources to maintain healthy ecosystems is one of the main goals of the ecosystem approach to fisheries (EAF). while the number of international treaties call for the implementation of EAF, there are still gaps in the underlying methodology. One aspect that has received substantial scientific attention recently in fisheries-induced evolution (FIE). Increasing evidence indicates that intensive fishing has the potential to exert strong directional selection on life-history...

  6. Comparative analysis of hydroacoustic lakebed classification in three different Brazilian reservoirs

    Science.gov (United States)

    Hilgert, Stephan; Sotiri, Klajdi; Fuchs, Stephan

    2017-04-01

    Until today, the surface of artificial water bodies around the world reached an area of around 500,000 km2 equaling one third of the surface of natural water bodies. Most of the constructed waster bodies are reservoirs with a variety of usage purposes, reaching from drinking water supply, electricity production, flood protection to recreation. All reservoirs have in common, that they disrupt riverine systems and their biochemical cycles and promote the accumulation of sediments upstream of the dam. The accumulated sediments contain organic matter, nutrients and/or pollutants which have a direct influence on the water quality within the impoundment. Consequently, detailed knowledge about the amount and the quality of accumulated sediments is an essential information for reservoir management. In many cases the extensive areas covered by the impoundments make it difficult and expensive to assess sediment characteristics with a high spatial resolution. Spatial extrapolations and mass balances based on point information may suffer from strong deviations. We combined sediment point measurements (core and grab sampling) with hydroacoustic sediment classification in order to precisely map sediment parameters. Three different reservoirs (Vossoroca, Capivari, Passauna) in the south-east of Brazil were investigated between 2011 and 2015. A single beam echosounder (EA 400, Kongsberg) with two frequencies (200 & 38 kHz) was used for the hydroacoustic classification. Over 50 core samples and 30 grab samples were taken for physical and chemical analysis to serve as ground truthing of the hydroacoustic measurements. All three reservoirs were covered with dense measurement transects allowing for a lakebed classification of the entire sediment surface. Significant correlations of physical parameters like grain size distribution and density as well chemical parameters like organic carbon content and total phosphorous with a selection of hydroacoustic parameters were obtained. They

  7. Hydroacoustic estimates of abundance and spatial distribution of pelagic prey fishes in western Lake Superior

    Science.gov (United States)

    Mason, Doran M.; Johnson, Timothy B.; Harvey, Chris J.; Kitchell, James F.; Schram, Stephen T.; Bronte, Charles R.; Hoff, MIchael H.; Lozano, Stephen J.; Trebitz, Anett S.; Schreiner, Donald R.; Lamon, E. Conrad; Hrabik, Thomas R.

    2005-01-01

    Lake herring (Coregonus artedi) and rainbow smelt (Osmerus mordax) are a valuable prey resource for the recovering lake trout (Salvelinus namaycush) in Lake Superior. However, prey biomass may be insufficient to support the current predator demand. In August 1997, we assessed the abundance and spatial distribution of pelagic coregonines and rainbow smelt in western Lake Superior by combining a 120 kHz split beam acoustics system with midwater trawls. Coregonines comprised the majority of the midwater trawl catches and the length distributions for trawl caught fish coincided with estimated sizes of acoustic targets. Overall mean pelagic prey fish biomass was 15.56 kg ha−1 with the greatest fish biomass occurring in the Apostle Islands region (27.98 kg ha−1), followed by the Duluth Minnesota region (20.22 kg ha−1), and with the lowest biomass occurring in the open waters of western Lake Superior (9.46 kg ha−1). Biomass estimates from hydroacoustics were typically 2–134 times greater than estimates derived from spring bottom trawl surveys. Prey fish biomass for Lake Superior is about order of magnitude less than acoustic estimates for Lakes Michigan and Ontario. Discrepancies observed between bioenergetics-based estimates of predator consumption of coregonines and earlier coregonine biomass estimates may be accounted for by our hydroacoustic estimates.

  8. Rapid Fishery Assessment by Market Survey (RFAMS)--an improved rapid-assessment approach to characterising fish landings in developing countries.

    Science.gov (United States)

    White, William T; Last, Peter R; Dharmadi; Faizah, Ria; Chodrijah, Umi; Buckworth, Rik C; Dichmont, Catherine M

    2014-01-01

    The complex multi-gear, multi-species tropical fisheries in developing countries are poorly understood and characterising the landings from these fisheries is often impossible using conventional approaches. A rapid assessment method for characterising landings at fish markets, using an index of abundance and estimated weight within taxonomic groups, is described. This approach was developed for contexts where there are no detailed data collection protocols, and where consistent data collection across a wide range of fisheries types and geographic areas is required, regardless of the size of the site and scale of the landings. This methodology, which was demonstrated at seven fish landing sites/fish markets in southern Indonesia between July 2008 and January 2011, provides a rapid assessment of the abundance and diversity in the wild catch over a wide variety of taxonomic groups. The approach has wider application for species-rich fisheries in developing countries where there is an urgent need for better data collection protocols, monitoring future changes in market demographics, and evaluating health of fisheries.

  9. Workgroup for Hydraulic laboratory Testing and Verification of Hydroacoustic Instrumentation

    Science.gov (United States)

    Fulford, Janice M.; Armstrong, Brandy N.; Thibodeaux, Kirk G.

    2015-01-01

    An international workgroup was recently formed for hydraulic laboratory testing and verification of hydroacoustic instrumentation used for water velocity measurements. The activities of the workgroup have included one face to face meeting, conference calls and an inter-laboratory exchange of two acoustic meters among participating laboratories. Good agreement was found among four laboratories at higher tow speeds and poorer agreement at the lowest tow speed.

  10. Assessment of Fishery Resources available in Lake Allen Patuxent Research National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of the survey was to provide baseline fishery data in support of the Refuge's public use goals and establish a basis upon which management could plan...

  11. Final Environmental Assessment : Fisheries and Lake Rehabilitation Plan on St. Vincent National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The U.S. Fish and Wildlife Service proposes to initiate actions to rehabilitate the St. Vincent Island freshwater fishery and lake/marsh system. Five of the island's...

  12. 75 FR 52510 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review for...

    Science.gov (United States)

    2010-08-26

    ... Blacknose Sharks AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric... NOAA Fisheries and the Atlantic and Gulf States Marine Fisheries Commissions have implemented the..., biologists, and researchers; constituency representatives including fishermen, environmentalists, and NGO's...

  13. 77 FR 51771 - Fisheries of the Gulf of Mexico and South Atlantic; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2012-08-27

    ... South Atlantic Spanish Mackerel and Cobia AGENCY: National Marine Fisheries Service (NMFS), National..., biologists, and researchers; constituency representatives including fishermen, environmentalists, and..., Acting Deputy Director, Office of Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE...

  14. Assessing broad life cycle impacts of daily onboard decision-making, annual strategic planning, and fisheries management in a northeast Atlantic trawl fishery

    NARCIS (Netherlands)

    Ziegler, F.; Groen, E.A.; Hornborg, S.; Bokkers, E.A.M.; Karlsen, K.M.; Boer, de I.J.M.

    2015-01-01

    Purpose: Capture fisheries are the only industrial-scale harvesting of a wild resource for food. Temporal variability in environmental performance of fisheries has only recently begun to be explored, but only between years, not within a year. Our aim was to better understand the causes of temporal v

  15. Echoview as a multibeam sonar data processing and analysis toolkit for fisheries research

    Science.gov (United States)

    Buelens, Bart; Pauly, Tim; Higginbottom, Ian

    2003-10-01

    Echoview is a hydroacoustic data analysis software package, widely used in the fisheries research and stock assessment communities. Originally developed to handle a variety of single-beam sonar data formats, Echoview has been extended to support multibeam data. Multibeam data logging, lossless compression, and real time beamforming and display are some of the software's core features. Multibeam data has an additional dimension compared to single-beam data, and a 3D data viewer has been developed providing 3D visualizations of the seabed and fish schools detected by built-in algorithms. Since the multibeam module is just one of many software modules of the Echoview package, data from other sources such as single-beam sonar systems and current profilers can be combined and analyzed together with the multibeam data. The combination of coincident fish density estimates from calibrated single-beam backscatter data with school volume estimates from multibeam data will represent a significant improvement in stock assessment methods. Ongoing research and development will make it possible for Echoview to follow and even set new trends in multibeam water-column data analysis for fisheries research. Features under development include calibration, vessel motion compensation, improved feature detection, and enhanced and animated 3D displays.

  16. Assessment of the Fishery Improvement Opportunities on the Pend Oreille River, 1989 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Barber, Michael R.; Renberg, Becky L.; Vella, John J.

    1990-09-01

    The purpose of this study was to assess the fishery improvement opportunities on the Box Canyon portion of the Pend Oreille River. This three year study was initiated as part of the Northwest Power Planning Council's 1987 Columbia River Basin Fish and Wildlife Program. This report contains the findings of the second year of the study. Currently, yellow perch (Perca flavescens (Mitchill)) are the predominant fish species in the river and largemouth bass (Micropterus salmoides (Lacepede)) are the predominant sport fish. The objectives of the second year of the study were to determine: the relative abundance of each species in the river and sloughs; the population levels in five selected tributaries and, if possible, for fish in the river and sloughs; fish growth rates; the feeding habits and abundance of preferred prey; migration patterns; and the total fishing pressure, catch-per-unit-effort, and total harvest by conducting a year-round creel survey. 55 refs., 7 figs., 154 tabs.

  17. Assessment of the sardine (Sardina pilchardus Walbaum, 1792 fishery in the eastern Mediterranean basin (North Aegean Sea

    Directory of Open Access Journals (Sweden)

    K. ANTONAKAKIS

    2012-12-01

    Full Text Available The aim of this study was to describe the biometric characteristics of the European sardine (Sardina pilchardus catches and assess the current status of sardine stock in North Aegean Sea based on population characteristics and abundance trends. The stock was dominated by age groups 1 and 2, not exceeding age group 4. The sardine stock in this area was assessed through an Integrated Catch-at-Age model which implements a separable Virtual Population Analysis on catch at age data with weighted tuning indices. Sardine landings data derived from the commercial purse seine fishery over the period 2000-2008 were combined with the age structure of the stock as resulted from fisheries independent acoustic surveys. Sensitivity analysis of the impact of natural mortality values on stock assessment results was applied. Additionally forecast of the sardine population parameters and catches under different exploitation scenarios was implemented in a medium term basis. Results indicated that the North Aegean Sea sardine stock is considered fully exploited with the fishery operating close but over the empirical exploitation level for sustainability. Finally, the status of the sardine stock in N. Aegean Sea is discussed in relation to the sardine stocks from the western and the central Mediterranean basin.

  18. Assessment of the sardine (Sardina pilchardus Walbaum, 1792 fishery in the eastern Mediterranean basin (North Aegean Sea

    Directory of Open Access Journals (Sweden)

    K. ANTONAKAKIS

    2011-06-01

    Full Text Available The aim of this study was to describe the biometric characteristics of the European sardine (Sardina pilchardus catches and assess the current status of sardine stock in North Aegean Sea based on population characteristics and abundance trends. The stock was dominated by age groups 1 and 2, not exceeding age group 4. The sardine stock in this area was assessed through an Integrated Catch-at-Age model which implements a separable Virtual Population Analysis on catch at age data with weighted tuning indices. Sardine landings data derived from the commercial purse seine fishery over the period 2000-2008 were combined with the age structure of the stock as resulted from fisheries independent acoustic surveys. Sensitivity analysis of the impact of natural mortality values on stock assessment results was applied. Additionally forecast of the sardine population parameters and catches under different exploitation scenarios was implemented in a medium term basis. Results indicated that the North Aegean Sea sardine stock is considered fully exploited with the fishery operating close but over the empirical exploitation level for sustainability. Finally, the status of the sardine stock in N. Aegean Sea is discussed in relation to the sardine stocks from the western and the central Mediterranean basin.

  19. 77 FR 29981 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR); Public Meetings

    Science.gov (United States)

    2012-05-21

    .... FOR FURTHER INFORMATION CONTACT: Ryan Rindone, SEDAR Coordinator, 2203 North Lois Ave, Suite 1100... composition, and fishery dependent and fishery independent measures of stock abundance. January 28-February...

  20. Modeling Tsunamis and Hydroacoustic Waves from Megathrust Earthquakes

    Science.gov (United States)

    Lotto, G. C.; Belair, G. M.; Kozdon, J. E.; Dunham, E. M.

    2013-12-01

    The immense damage caused by the 11 March 2011 Tohoku, Japan earthquake demonstrated the importance of understanding tsunami excitation by megathrust ruptures. Of particular interest are any faster-propagating seismic or hydroacoustic signals that could be used to rapidly predict tsunami wave heights. To study the full seismic, acoustic, and tsunami wavefields, we have developed a provably stable and accurate finite-difference method that couples an elastic solid to a compressible fluid subject to gravitational restoring forces. We introduce a new treatment of the dynamic (free surface) boundary condition on the moving sea surface in the presence of gravity that is valid for small-amplitude perturbations about an ocean initially in hydrostatic balance. This permits us to model surface gravity waves in the linearized limit, including dispersion from nonhydrostatic motions at short wavelengths. This is done using summation-by-parts (SBP) finite difference operators and weak enforcement of boundary conditions. Shallow coseismic slip during megathrust events causes seafloor uplift that excites both tsunamis and long-period (~10 s) hydroacoustic waves; the latter ocean sound waves travel at several km/s and reach the coast many minutes sooner than tsunami waves. These hydroacoustic waves might be used as part of local tsunami early warning systems. Our previous dynamic rupture simulations of the Tohoku event, which neglected surface gravity waves, revealed correlations between pressure perturbations recorded at the seafloor (associated with ~10 s hydroacoustic waves in the ocean) and near-trench seafloor uplift caused by shallow slip. Now that we can model tsunamis within the same code, we plan to quantify the correlation between these pressure perturbations and tsunami height. We are also investigating properties of these hydroacoustic modes, which involve significant motions of the solid Earth as well as the ocean. Phase and group velocity curves for a uniform ocean

  1. Assessing Social – Ecological Trade-Offs to Advance Ecosystem-Based Fisheries Management

    Science.gov (United States)

    Voss, Rudi; Quaas, Martin F.; Schmidt, Jörn O.; Tahvonen, Olli; Lindegren, Martin; Möllmann, Christian

    2014-01-01

    Modern resource management faces trade-offs in the provision of various ecosystem goods and services to humanity. For fisheries management to develop into an ecosystem-based approach, the goal is not only to maximize economic profits, but to consider equally important conservation and social equity goals. We introduce such a triple-bottom line approach to the management of multi-species fisheries using the Baltic Sea as a case study. We apply a coupled ecological-economic optimization model to address the actual fisheries management challenge of trading-off the recovery of collapsed cod stocks versus the health of ecologically important forage fish populations. Management strategies based on profit maximization would rebuild the cod stock to high levels but may cause the risk of stock collapse for forage species with low market value, such as Baltic sprat (Fig. 1A). Economically efficient conservation efforts to protect sprat would be borne almost exclusively by the forage fishery as sprat fishing effort and profits would strongly be reduced. Unless compensation is paid, this would challenge equity between fishing sectors (Fig. 1B). Optimizing equity while respecting sprat biomass precautionary levels would reduce potential profits of the overall Baltic fishery, but may offer an acceptable balance between overall profits, species conservation and social equity (Fig. 1C). Our case study shows a practical example of how an ecosystem-based fisheries management will be able to offer society options to solve common conflicts between different resource uses. Adding equity considerations to the traditional trade-off between economy and ecology will greatly enhance credibility and hence compliance to management decisions, a further footstep towards healthy fish stocks and sustainable fisheries in the world ocean. PMID:25268117

  2. Assessing social--ecological trade-offs to advance ecosystem-based fisheries management.

    Directory of Open Access Journals (Sweden)

    Rudi Voss

    Full Text Available Modern resource management faces trade-offs in the provision of various ecosystem goods and services to humanity. For fisheries management to develop into an ecosystem-based approach, the goal is not only to maximize economic profits, but to consider equally important conservation and social equity goals. We introduce such a triple-bottom line approach to the management of multi-species fisheries using the Baltic Sea as a case study. We apply a coupled ecological-economic optimization model to address the actual fisheries management challenge of trading-off the recovery of collapsed cod stocks versus the health of ecologically important forage fish populations. Management strategies based on profit maximization would rebuild the cod stock to high levels but may cause the risk of stock collapse for forage species with low market value, such as Baltic sprat (Fig. 1A. Economically efficient conservation efforts to protect sprat would be borne almost exclusively by the forage fishery as sprat fishing effort and profits would strongly be reduced. Unless compensation is paid, this would challenge equity between fishing sectors (Fig. 1B. Optimizing equity while respecting sprat biomass precautionary levels would reduce potential profits of the overall Baltic fishery, but may offer an acceptable balance between overall profits, species conservation and social equity (Fig. 1C. Our case study shows a practical example of how an ecosystem-based fisheries management will be able to offer society options to solve common conflicts between different resource uses. Adding equity considerations to the traditional trade-off between economy and ecology will greatly enhance credibility and hence compliance to management decisions, a further footstep towards healthy fish stocks and sustainable fisheries in the world ocean.

  3. Assessing social--ecological trade-offs to advance ecosystem-based fisheries management.

    Science.gov (United States)

    Voss, Rudi; Quaas, Martin F; Schmidt, Jörn O; Tahvonen, Olli; Lindegren, Martin; Möllmann, Christian

    2014-01-01

    Modern resource management faces trade-offs in the provision of various ecosystem goods and services to humanity. For fisheries management to develop into an ecosystem-based approach, the goal is not only to maximize economic profits, but to consider equally important conservation and social equity goals. We introduce such a triple-bottom line approach to the management of multi-species fisheries using the Baltic Sea as a case study. We apply a coupled ecological-economic optimization model to address the actual fisheries management challenge of trading-off the recovery of collapsed cod stocks versus the health of ecologically important forage fish populations. Management strategies based on profit maximization would rebuild the cod stock to high levels but may cause the risk of stock collapse for forage species with low market value, such as Baltic sprat (Fig. 1A). Economically efficient conservation efforts to protect sprat would be borne almost exclusively by the forage fishery as sprat fishing effort and profits would strongly be reduced. Unless compensation is paid, this would challenge equity between fishing sectors (Fig. 1B). Optimizing equity while respecting sprat biomass precautionary levels would reduce potential profits of the overall Baltic fishery, but may offer an acceptable balance between overall profits, species conservation and social equity (Fig. 1C). Our case study shows a practical example of how an ecosystem-based fisheries management will be able to offer society options to solve common conflicts between different resource uses. Adding equity considerations to the traditional trade-off between economy and ecology will greatly enhance credibility and hence compliance to management decisions, a further footstep towards healthy fish stocks and sustainable fisheries in the world ocean.

  4. A towed body designed for side-scanning hydroacoustic surveying of fish stocks in shallow waters

    NARCIS (Netherlands)

    Mous, P.J.; Kemper, J.; Schelvis, A.

    1999-01-01

    An aluminum towed body was designed for use in hydroacoustic surveying of fish stocks in shallow (2–10 m depth) inland waters. The design allows applications in deep (>10 m) water bodies as well. Test results showed that the towed body was a stable platform for the hydroacoustic transducer. The towe

  5. Assessing incidental bycatch of seabirds in Norwegian coastal commercial fisheries: Empirical and methodological lessons

    Directory of Open Access Journals (Sweden)

    Kirstin Fangel

    2015-07-01

    Full Text Available With diminishing seabird populations and little knowledge on incidental bycatch in fisheries in the Northeast Atlantic, this study aimed to screen seabird bycatch in Norwegian coastal fisheries in 2009. The purpose was to 1 quantify magnitude of seabird bycatch rates and estimate total bycatch from the entire fleet by different estimators 2 evaluate data from an access point survey against monitoring data from a reference fleet as methods for collecting data on bycatch mortality of seabirds and 3 give advice on further bycatch studies. The study focused on three small-vessel fisheries (11 000 birds estimated caught. The black guillemot Cepphus gryllealso stood out as a numerous victim, constituting almost two thirds of the >3000 birds estimated to have drowned in lumpfish gillnets. The two methods were both considered to hold merit and yielded approximately similar estimates of the bycatch in the coastal cod fisheries, however BPUE differs. Further studies are recommended especially on the lumpfish gillnet and Greenland halibut longline fisheries and on temporal and spatial variations in bycatch. More studies are also needed to model effects on seabirds at the population level.

  6. Assessment of Caspian Seal By-Catch in an Illegal Fishery Using an Interview-Based Approach.

    Science.gov (United States)

    Dmitrieva, Lilia; Kondakov, Andrey A; Oleynikov, Eugeny; Kydyrmanov, Aidyn; Karamendin, Kobey; Kasimbekov, Yesbol; Baimukanov, Mirgaliy; Wilson, Susan; Goodman, Simon J

    2013-01-01

    The Caspian seal (Pusa caspica) has declined by more than 90% since 1900 and is listed as endangered by IUCN. We made the first quantitative assessment of Caspian seal by-catch mortality in fisheries in the north Caspian Sea by conducting semi-structured interviews in fishing communities along the coasts of Russia (Kalmykia, Dagestan), Kazakhstan and Turkmenistan. We recorded a documented minimum by-catch of 1,215 seals in the survey sample, for the 2008-2009 fishing season, 93% of which occurred in illegal sturgeon fisheries. Due to the illegal nature of the fishery, accurately quantifying total fishing effort is problematic and the survey sample could reflect less than 10% of poaching activity in the north Caspian Sea. Therefore total annual by-catch may be significantly greater than the minimum documented by the survey. The presence of high by-catch rates was supported independently by evidence of net entanglement from seal carcasses, during a mass stranding on the Kazakh coast in May 2009, where 30 of 312 carcasses were entangled in large mesh sturgeon net remnants. The documented minimum by-catch may account for 5 to 19% of annual pup production. Sturgeon poaching therefore not only represents a serious threat to Caspian sturgeon populations, but may also be having broader impacts on the Caspian Sea ecosystem by contributing to a decline in one of the ecosystem's key predators. This study demonstrates the utility of interview-based approaches in providing rapid assessments of by-catch in illegal small-scale fisheries, which are not amenable to study by other methods.

  7. Assessment of Caspian Seal By-Catch in an Illegal Fishery Using an Interview-Based Approach.

    Directory of Open Access Journals (Sweden)

    Lilia Dmitrieva

    Full Text Available The Caspian seal (Pusa caspica has declined by more than 90% since 1900 and is listed as endangered by IUCN. We made the first quantitative assessment of Caspian seal by-catch mortality in fisheries in the north Caspian Sea by conducting semi-structured interviews in fishing communities along the coasts of Russia (Kalmykia, Dagestan, Kazakhstan and Turkmenistan. We recorded a documented minimum by-catch of 1,215 seals in the survey sample, for the 2008-2009 fishing season, 93% of which occurred in illegal sturgeon fisheries. Due to the illegal nature of the fishery, accurately quantifying total fishing effort is problematic and the survey sample could reflect less than 10% of poaching activity in the north Caspian Sea. Therefore total annual by-catch may be significantly greater than the minimum documented by the survey. The presence of high by-catch rates was supported independently by evidence of net entanglement from seal carcasses, during a mass stranding on the Kazakh coast in May 2009, where 30 of 312 carcasses were entangled in large mesh sturgeon net remnants. The documented minimum by-catch may account for 5 to 19% of annual pup production. Sturgeon poaching therefore not only represents a serious threat to Caspian sturgeon populations, but may also be having broader impacts on the Caspian Sea ecosystem by contributing to a decline in one of the ecosystem's key predators. This study demonstrates the utility of interview-based approaches in providing rapid assessments of by-catch in illegal small-scale fisheries, which are not amenable to study by other methods.

  8. Improving selectivity of the Baltic cod pelagic trawl fishery: Experiments to assess the next step

    DEFF Research Database (Denmark)

    Madsen, Niels; Tschernij, Vesa; Holst, René

    2010-01-01

    Due to declining cod (Gadus morhua) stocks, the Baltic Sea was one of the first areas regulated by the European Communities where selective escape windows were implemented to improve the exploitation pattern. Increasing discard rates and the potential for a significant increase of the spawning...... stock and the yield of the fishery are important reasons to further improve the selectivity of the fishery and to asses the potential next step in this process. In this study, we tested three relatively different design concepts, in the Baltic cod pelagic trawl fishery, that are relevant to past...... or present legislation and that were developed to meet requirements of increased selectivity performance. A standard nominal 135 mm diamond mesh codend, a codend with two nominal 125 mm bottom windows, and a codend with a nominal 125 mm nominal top window were tested using the covered codend method. A Danish...

  9. Manual on sample-based data collection for fisheries assessment : Examples from Viet Nam

    DEFF Research Database (Denmark)

    Sparre, Per Johan

    with through both detailed discussion and by using simple examples. These examples are mostly based on situations in tropical fisheries and, in particular, experience has been drawn from developing a data collection programme in Viet Nam. The main questions addressed in the manual are which fisheries data...... (artisanal) vessels and a few large (industrial) vessels. The methodology is the "sample-based approach" - the manual does not deal with a methodology that assumes complete enumeration. The data collection methodology presented attempts to utilize whatever information can be obtained in practice......This manual deals with the practical implementation of a routine data collection programme. This programme is developed through a top-down approach, from the identification of the objectives down to the practical recording and management of data obtained from the fishery. The issues are dealt...

  10. Fishery Biology Database (AGDBS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Basic biological data are the foundation on which all assessments of fisheries resources are built. These include parameters such as the size and age composition of...

  11. Lake Pend Oreille Fishery Recovery Project, 1997-1998 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Maiolie, Melo A.; Ament, William J.; Harryman, Bill (Idaho Department of Fish and Game, Boise, ID)

    2000-05-01

    The elevation of Lake Pend Oreille was kept 1.2 m higher during the winter of 1997-1998 in an attempt to recover the impacted kokanee fishery. This was the second winter of a scheduled three-year test. Hydroacoustic surveys and trawling were conducted in the fall of 1998 to assess the kokanee population. We estimated the abundance of wild and hatchery fry in the lake at 3.71 million by hydroacoustics. These originated from an estimated 11.2 million eggs spawned during the fall of 1997. The survival from wild spawned eggs to wild fry was 9.7%, which is the highest egg-to-fry survival rate on record. This is the strongest indication to date that higher lake levels were having a direct benefit to the kokanee population. By trawling, we found that total kokanee abundance in the lake dropped to a new record low of 2.8 million fish. The number of adult kokanee in the lake was below average: 100,000 age 4 kokanee (100% mature) and 730,000 age 3 kokanee (29% mature). These fish laid an estimated 52.1 million eggs in 1998. Hatchery personnel collected 9.0 million eggs which were cultured, marked by cold branding the otoliths, and the resulting fry stocked into the lake in 1999. Peak counts of spawning kokanee were 5,100 fish on the shoreline and 9,700 fish in tributary streams; unusually high considering the low population in the lake. Opossum shrimp Mysis relicta declined in the southern two sections of the lake but increased in the northern end. Immature and mature shrimp (excluding young-of-the-year [YOY] shrimp) densities averaged 426 shrimp/m{sup 2}. The number of waterfowl using the lake in the winter of 1998-1999 increased from the previous three years to over 30,000 ducks, geese, and swans.

  12. Benthos and demersal fishery resources assessment in the shelf region of Indian coast

    Digital Repository Service at National Institute of Oceanography (India)

    Harkantra, S.N.

    The potential of exploitable demersal fishery resources is estimated to be 0.4 million metric tones per year (m.m.t.y.) and 0.25 m.m.t.y. respectively based on benthic biomass production and the food pyramid concept, in the shelf region of Indian...

  13. 78 FR 25702 - Notice of Availability of a Draft Programmatic Environmental Assessment for Fisheries Research...

    Science.gov (United States)

    2013-05-02

    ... funding fisheries and ecosystem research along the U.S. West Coast, throughout the Eastern Tropical... Current Ecosystem (CCE), throughout the Eastern Tropical Pacific (ETP) Ocean, and in the Scotia Sea area... activities occur in areas inhabited by species of marine mammals, birds, sea turtles, and fish listed...

  14. Economic Vulnerability Assessment of U.S. Fishery Revenues to Ocean Acidification

    Science.gov (United States)

    Cooley, S. R.; Doney, S. C.

    2008-12-01

    Ocean acidification, a predictable consequence of rising anthropogenic CO2 emissions, is poised to change marine ecosystems profoundly by decreasing average ocean pH and the carbonate mineral saturation state worldwide. These conditions slow or reverse marine plant and animal calcium carbonate shell growth, thereby harming economically valuable species. In 2006, shellfish and crustaceans provided 50% of the 4 billion U.S. domestic commercial harvest value; value added to commercial fishery products contributed 35 billion to the gross national product that year. Laboratory studies have shown that ocean acidification decreases shellfish calcification; ocean acidification--driven declines in commercial shellfish and crustacean harvests between now and 2060 could decrease nationwide time-integrated primary commercial revenues by 860 million to 14 billion (net present value, 2006 dollars), depending on CO2 emissions, discount rates, biological responses, and fishery structure. This estimate excludes losses from coral reef damage and possible fishery collapses if ocean acidification pushes ecosystems past ecological tipping points. Expanding job losses and indirect economic costs will follow harvest decreases as ocean acidification broadly damages marine habitats and alters marine resource availability. Losses will harm many regions already possessing little economic resilience. The only true solution to ocean acidification is reducing atmospheric CO2 emissions, but implementing regional adaptive responses now from an ecosystem-wide, fisheries perspective will help better preserve sustainable ecosystem function and economic yields. Comprehensive management strategies must include monitoring critical fisheries, explicitly accounting for ocean acidification in management models, reducing fishing pressure and environmental stresses, and supporting regional economies most sensitive to acidification's impacts.

  15. Fisheries: hope or despair?

    Science.gov (United States)

    Pitcher, Tony J; Cheung, William W L

    2013-09-30

    Recent work suggesting that fisheries depletions have turned the corner is misplaced because analysis was based largely on fisheries from better-managed developed-world fisheries. Some indicators of status show improvements in the minority of fisheries subjected to formal assessment. Other indicators, such as trophic level and catch time series, have been controversial. Nevertheless, several deeper analyses of the status of the majority of world fisheries confirm the previous dismal picture: serious depletions are the norm world-wide, management quality is poor, catch per effort is still declining. The performance of stock assessment itself may stand challenged by random environmental shifts and by the need to accommodate ecosystem-level effects. The global picture for further fisheries species extinctions, the degradation of ecosystem food webs and seafood security is indeed alarming. Moreover, marine ecosystems and their embedded fisheries are challenged in parallel by climate change, acidification, metabolic disruptors and other pollutants. Attempts to remedy the situation need to be urgent, focused, innovative and global.

  16. Coral Patch seamount (NE Atlantic – a sedimentological and megafaunal reconnaissance based on video and hydroacoustic surveys

    Directory of Open Access Journals (Sweden)

    C. Wienberg

    2013-05-01

    Full Text Available The present study provides new knowledge about the so far largely unexplored Coral Patch seamount which is located in the NE Atlantic Ocean half-way between the Iberian Peninsula and Madeira. For the first time a detailed hydroacoustic mapping (MBES in conjunction with video surveys (ROV, camera sled were performed to describe the sedimentological and biological characteristics of this sub-elliptical ENE-WSW elongated seamount. Video observations were restricted to the southwestern summit area of Coral Patch seamount (water depth: 560–760 m and revealed that this part of the summit is dominated by exposed hard substrate, whereas soft sediment is just a minor substrate component. Although exposed hardgrounds are dominant for this summit area and, thus, offer suitable habitat for settlement by benthic organisms, the benthic megafauna shows rather scarce occurrence. In particular, scleractinian framework-building cold-water corals are apparently rare with very few isolated and small-sized live occurrences of the species Lophelia pertusa and Madrepora oculata. In contrast, dead coral framework and coral rubble are more frequent pointing to a higher abundance of cold-water corals on Coral Patch during the recent past. This is even supported by the observation of fishing lines that got entangled with rather fresh-looking coral frameworks. Overall, long lines and various species of commercially important fish were frequently observed emphasising the potential of Coral Patch as an important target for fisheries that may have impacted the entire benthic community. Hydroacoustic seabed classification covered the entire summit of Coral Patch and its northern and southern flanks (water depth: 560–2660 m and revealed extended areas dominated by mixed and soft sediments at the northern flank and to a minor degree at its easternmost summit and southern flank. Nevertheless, these data also predict most of the summit area to be dominated by exposed bedrock

  17. Coral Patch seamount (NE Atlantic – a sedimentological and macrofaunal reconnaissance based on video and hydroacoustic surveys

    Directory of Open Access Journals (Sweden)

    C. Wienberg

    2012-12-01

    Full Text Available The present study provides new knowledge about the so far largely unexplored Coral Patch seamount which is located in the NE Atlantic Ocean half-way between the Iberian Peninsula and Madeira. For the first time a detailed hydroacoustic mapping (MBES in conjunction with video surveys (ROV, camera sled were performed to describe the sedimentological and biological characteristics of this sub-elliptical ENE-WSW elongated seamount. Video observations were restricted to the south-western summit area of Coral Patch seamount (area: ~ 8 km2, water depth: 560–760 m and revealed that this part of the summit is dominated by exposed hard substrate, whereas soft sediment is just a minor substrate component. Although exposed hardgrounds are dominant for this summit area, and thus, offer suitable habitat for settlement by benthic organisms, the macrofauna shows rather low abundance and diversity. In particular, scleractinian framework-building cold-water corals are apparently rare with very few isolated and small-sized live occurrences of the species Lophelia pertusa and Madrepora oculata. In contrast, dead coral framework and coral rubble are more frequent pointing to a higher abundance of cold-water corals on Coral Patch during the recent past. This is even supported by the observation of fishing lines that got entangled with rather fresh-looking coral frameworks. Overall, long lines and various species of commercially important fish were frequently observed emphasising the potential of Coral Patch as an important target for fisheries that may have impacted the entire benthic community. Hydroacoustic seabed classification covered the entire summit of Coral Patch and its northern and southern flanks (area: 560 km2; water depth: 560–2660 m and revealed extended areas dominated by mixed and soft sediments at the northern flank and to a minor degree at its easternmost summit and southern flank. Nevertheless, also these

  18. Hydroacoustic Evaluation of Juvenile Salmonid Passage at The Dalles Dam Spillway, 2006

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Khan, Fenton; Skalski, John R.; Rakowski, Cynthia L.; Richmond, Marshall C.; Serkowski, John A.

    2007-05-24

    The objective of this study was to determine detailed vertical, horizontal, intensive, and diel distributions of juvenile salmonid passage at the spillway at The Dalles Dam from April 12 to July16, 2006. These data are being applied in the Spillway Improvements Program to position release pipes for direct injury and mortality studies and to provide baseline data for assessment of the vortex suppression devices scheduled for deployment in 2007. We estimated fish distributions from hydroacoustic data collected with split-beam transducers arrayed across Bays 1 through 9 and 14. Spill at ~20 kcfs per bay was bulked at Bays 1-6, although the other bays were opened at times during the study to maintain a 40% spill percentage out of total project discharge. The vertical distribution of fish was skewed toward the surface during spring, but during summer, passage peaked at 2-3 m above the spillway ogee. Fish passage rates (number per hour) and fish densities (number per kcfs) were highest at Bay 6, followed by passage at Bay 5. This result comports with spillway horizontal distribution data from radio telemetry and hydroacoustic studies in 2004. The vertical and horizontal distribution of fish passage at bays 5 and 6 was much more variable during spring than summer and more variable at bay 5 than bay 6. Diel distribution data revealed that fish passage was highest during 0600-0700 h in spring; otherwise passage was reasonably uniform on a diel basis. This study substantiates the purpose of the spillway vortex suppression device to re-distribute downstream migrants away from Bay 6 toward Bays 1-5.

  19. Optimization of Concurrent Deployments of the Juvenile Salmon Acoustic Telemetry System and Other Hydroacoustic Equipment at John Day Dam

    Energy Technology Data Exchange (ETDEWEB)

    Ploskey, Gene R.; Hughes, James S.; Khan, Fenton; Kim, Jina; Lamarche, Brian L.; Johnson, Gary E.; Choi, Eric Y.; Faber, Derrek M.; Wilberding, Matthew C.; Deng, Zhiqun; Weiland, Mark A.; Zimmerman, Shon A.; Fischer, Eric S.; Cushing, Aaron W.

    2008-09-01

    The purpose of this report is to document the results of the acoustic optimization study conducted at John Day Dam during January and February 2008. The goal of the study was to optimize performance of the Juvenile Salmon Acoustic Telemetry System (JSATS) by determining deployment and data acquisition methods to minimize electrical and acoustic interference from various other acoustic sampling devices. Thereby, this would allow concurrent sampling by active and passive acoustic methods during the formal evaluations of the prototype surface flow outlets at the dam during spring and summer outmigration seasons for juvenile salmonids. The objectives for the optimization study at John Day Dam were to: 1. Design and test prototypes and provide a total needs list of pipes and trolleys to deploy JSATS hydrophones on the forebay face of the powerhouse and spillway. 2. Assess the effect on mean percentage decoded of JSATS transmissions from tags arrayed in the forebay and detected on the hydrophones by comparing: turbine unit OFF vs. ON; spill bay OPEN vs. CLOSED; dual frequency identification sonar (DIDSON) and acoustic Doppler current profiler (ADCP) both OFF vs. ON at a spill bay; and, fixed-aspect hydroacoustic system OFF vs. ON at a turbine unit and a spill bay. 3. Determine the relationship between fixed-aspect hydroacoustic transmit level and mean percentage of JSATS transmissions decoded. The general approach was to use hydrophones to listen for transmissions from JSATS tags deployed in vertical arrays in a series perpendicular to the face of the dam. We used acoustic telemetry equipment manufactured by Technologic and Sonic Concepts. In addition, we assessed old and new JSATS signal detectors and decoders and two different types of hydrophone baffling. The optimization study consisted of a suite of off/on tests. The primary response variable was mean percentage of tag transmissions decoded. We found that there was no appreciable adverse effect on mean percentage

  20. Optimization of Concurrent Deployments of the Juvenile Salmon Acoustic Telemetry System and Other Hydroacoustic Equipment at John Day Dam

    Energy Technology Data Exchange (ETDEWEB)

    Ploskey, Gene R.; Hughes, James S.; Khan, Fenton; Kim, Jina; Lamarche, Brian L.; Johnson, Gary E.; Choi, Eric Y.; Faber, Derrek M.; Wilberding, Matthew C.; Deng, Zhiqun; Weiland, Mark A.; Zimmerman, Shon A.; Fischer, Eric S.; Cushing, Aaron W.

    2008-09-01

    The purpose of this report is to document the results of the acoustic optimization study conducted at John Day Dam during January and February 2008. The goal of the study was to optimize performance of the Juvenile Salmon Acoustic Telemetry System (JSATS) by determining deployment and data acquisition methods to minimize electrical and acoustic interference from various other acoustic sampling devices. Thereby, this would allow concurrent sampling by active and passive acoustic methods during the formal evaluations of the prototype surface flow outlets at the dam during spring and summer outmigration seasons for juvenile salmonids. The objectives for the optimization study at John Day Dam were to: 1. Design and test prototypes and provide a total needs list of pipes and trolleys to deploy JSATS hydrophones on the forebay face of the powerhouse and spillway. 2. Assess the effect on mean percentage decoded of JSATS transmissions from tags arrayed in the forebay and detected on the hydrophones by comparing: turbine unit OFF vs. ON; spill bay OPEN vs. CLOSED; dual frequency identification sonar (DIDSON) and acoustic Doppler current profiler (ADCP) both OFF vs. ON at a spill bay; and, fixed-aspect hydroacoustic system OFF vs. ON at a turbine unit and a spill bay. 3. Determine the relationship between fixed-aspect hydroacoustic transmit level and mean percentage of JSATS transmissions decoded. The general approach was to use hydrophones to listen for transmissions from JSATS tags deployed in vertical arrays in a series perpendicular to the face of the dam. We used acoustic telemetry equipment manufactured by Technologic and Sonic Concepts. In addition, we assessed old and new JSATS signal detectors and decoders and two different types of hydrophone baffling. The optimization study consisted of a suite of off/on tests. The primary response variable was mean percentage of tag transmissions decoded. We found that there was no appreciable adverse effect on mean percentage

  1. Fish, fishers and fisheries of the Western Indian Ocean: their diversity and status. A preliminary assessment.

    Science.gov (United States)

    van der Elst, Rudy; Everett, Bernadine; Jiddawi, Narriman; Mwatha, Gerald; Afonso, Paula Santana; Boulle, David

    2005-01-15

    The Western Indian Ocean represents ca. 8% of the world's oceans but generates only 4% of the global industrial catch. This region is also home to a great proportion of the world's population, living in developing countries with a high dependence on marine resources. Trends in the declared landings of marine resources from the Western Indian Ocean suggest that this ocean may be approaching its maximum harvest potential of ca. 4 Mt per annum, but underreported artisanal catches complicate more-detailed analyses. There is a growing demand for 'new resources' to make up for declining stocks, while several large fluctuations are linked to changes in market demand and over exploitation. Artisanal fisheries in the region are highly diversified. Preliminary results are presented of a project that evaluates the conservation status and sustainable management practices in 168 different fishery types. It is concluded that the majority of the region's artisanal fisheries are not adequately supported by scientific information and that management strategies need to be improved if the enormous development challenges of East African countries are to be met.

  2. Economic Risk and Efficiency Assessment of Fisheries in Abu-Dhabi, United Arab Emirates (UAE: A Stochastic Approach

    Directory of Open Access Journals (Sweden)

    Eihab Fathelrahman

    2014-06-01

    Full Text Available The fishing industry in Abu-Dhabi, United Arab Emirates (UAE, plays an important role in diversifying food sources in order to enhance national food security. The fishing industry is facing an increasing risk that may impact the sustainability (i.e., quantity and quality of the fish caught and consumed in the UAE. Therefore, the main objective of this study is to analyze common Abu-Dhabi fishing management alternatives using various stochastic dominance techniques (i.e., first/second degree stochastic dominance, stochastic dominance with respect to a function and stochastic efficiency with respect to a function to assess the risk facing UAE fishermen. The techniques represent a risk assessment continuum, which can provide a ranking of management alternatives to improve decision making outcomes and help maintain long-term UAE fishing sustainability. Data for the stochastic dominance analyses were obtained from a cross-sectional survey conducted through face-to-face interviews of Abu Dhabi, UAE, fishermen. Analysis of fishing methods, trap sizes and trap numbers using stochastic efficiency with respect to a function (SERF showed that fishermen efficient practices were not the same for risk-neutral fishermen compared to risk averse fishermen. Overall, the stochastic dominance results illustrated the importance of considering both attitude towards risk and economic inefficiencies in managing UAE fishery practices and designing successful fishery policies, as well as improving decision-making at the fishermen level.

  3. 78 FR 74118 - Fisheries of the Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR) Assessments of...

    Science.gov (United States)

    2013-12-10

    ..., suggest sensitivity analyses, and decide on an appropriate model run or set of model runs to put forward... (see ADDRESSES) at least 10 business days prior to the meeting. Note: The times and sequence specified.... Tracey L. Thompson, Acting Deputy Director, Office of Sustainable Fisheries, National Marine...

  4. Optimization of Hydroacoustic Equipment Deployments at Lookout Point and Cougar Dams, Willamette Valley Project, 2010

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Khan, Fenton; Ploskey, Gene R.; Hughes, James S.; Fischer, Eric S.

    2010-08-18

    The goal of the study was to optimize performance of the fixed-location hydroacoustic systems at Lookout Point Dam (LOP) and the acoustic imaging system at Cougar Dam (CGR) by determining deployment and data acquisition methods that minimized structural, electrical, and acoustic interference. The general approach was a multi-step process from mount design to final system configuration. The optimization effort resulted in successful deployments of hydroacoustic equipment at LOP and CGR.

  5. Towards sustainable fisheries of the Öresund cod (Gadus morhua) through sub-stock-specific assessment and management recommendations

    DEFF Research Database (Denmark)

    Lindegren, Martin; Waldo, Staffan; Nilsson, P. Anders;

    2013-01-01

    Fisheries management traditionally relies on stock assessments assuming discrete populations within large administrational areas. However, failing to account for sub-stock structuring may result in overestimation of the stocks' true harvest potential and unsustainable exploitation of small stock...... elements. Atlantic cod (Gadus morhua) frequently occurs in spatially segregated populations, some of which exhibit fine-scaled stock structuring within current management boundaries. Here we use the locally spawning cod stock in the Sound (“Öresund”) as a case study, and perform a sub-stock......-specific assessment to evaluate biological and economic effects of managing the Sound cod as a separate stock. Our results indicate that reducing exploitation pressure, particularly through technical regulations i.e. increasing gill-net mesh sizes, would not only enhance the stock age distribution, but yield long...

  6. Seismic and hydroacoustic analysis relevant to MH370

    Energy Technology Data Exchange (ETDEWEB)

    Stead, Richard J. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-07-03

    The vicinity of the Indian Ocean is searched for open and readily available seismic and/or hydroacoustic stations that might have recorded a possible impact of MH370 with the ocean surface. Only three stations are identified: the IMS hydrophone arrays H01 and H08, and the Geoscope seismic station AIS. Analysis of the data from these stations shows an interesting arrival on H01 that has some interference from an Antarctic ice event, large amplitude repeating signals at H08 that obscure any possible arrivals, and large amplitude chaotic noise at AIS precludes any analysis at higher frequencies of interest. The results are therefore rather inconclusive but may point to a more southerly impact location within the overall Indian Ocean search region. The results would be more useful if they can be combined with any other data that are not readily available.

  7. Optimal and adaptive methods of processing hydroacoustic signals (review)

    Science.gov (United States)

    Malyshkin, G. S.; Sidel'nikov, G. B.

    2014-09-01

    Different methods of optimal and adaptive processing of hydroacoustic signals for multipath propagation and scattering are considered. Advantages and drawbacks of the classical adaptive (Capon, MUSIC, and Johnson) algorithms and "fast" projection algorithms are analyzed for the case of multipath propagation and scattering of strong signals. The classical optimal approaches to detecting multipath signals are presented. A mechanism of controlled normalization of strong signals is proposed to automatically detect weak signals. The results of simulating the operation of different detection algorithms for a linear equidistant array under multipath propagation and scattering are presented. An automatic detector is analyzed, which is based on classical or fast projection algorithms, which estimates the background proceeding from median filtering or the method of bilateral spatial contrast.

  8. Dyke leakage localization and hydraulic permeability estimation through self-potential and hydro-acoustic measurements: Self-potential 'abacus' diagram for hydraulic permeability estimation and uncertainty computation

    Science.gov (United States)

    Bolève, A.; Vandemeulebrouck, J.; Grangeon, J.

    2012-11-01

    In the present study, we propose the combination of two geophysical techniques, which we have applied to a dyke located in southeastern France that has a visible downstream flood area: the self-potential (SP) and hydro-acoustic methods. These methods are sensitive to two different types of signals: electric signals and water-soil pressure disturbances, respectively. The advantages of the SP technique lie in the high rate of data acquisition, which allows assessment of long dykes, and direct diagnosis in terms of leakage area delimitation and quantification. Coupled with punctual hydro-acoustic cartography, a leakage position can be precisely located, therefore allowing specific remediation decisions with regard to the results of the geophysical investigation. Here, the precise localization of leakage from an earth dyke has been identified using SP and hydro-acoustic signals, with the permeability of the preferential fluid flow area estimated by forward SP modeling. Moreover, we propose a general 'abacus' diagram for the estimation of hydraulic permeability of dyke leakage according to the magnitude of over water SP anomalies and the associated uncertainty.

  9. Implementing ecosystem-based fisheries management: from single-species to integrated ecosystem assessment and advice for Baltic Sea fish stocks

    DEFF Research Database (Denmark)

    Möllmann, Christian; Lindegren, Martin; Blenckner, Thorsten

    2014-01-01

    Theory behind ecosystem-based management (EBM) and ecosystem-based fisheries management (EBFM) is nowwell developed. However, the implementation of EBFM exemplified by fisheries management in Europe is still largely based on single-species assessments and ignores the wider ecosystem context...... and impact. The reason for the lack or slow implementation of EBM and specifically EBFM is a lack of a coherent strategy. Such a strategy is offered by recently developed integrated ecosystemassessments (IEAs), a formal synthesis tool to quantitatively analyse information on relevant natural and socio...

  10. Assessment of the dolphinfish Coryphaena hippurus (Perciformes: Coryphaenidae) fishery in Pacific Panama.

    Science.gov (United States)

    Guzman, Héctor M; Díaz-Ferguson, Edgardo; Vega, Angel J; Robles, Yolany A

    2015-09-01

    The dolphinfish (Coryphaena hippunis) is a highly migratory pelagic species commercially exploited by industrial, artisanal and recreational fisheries in tropical and subtropical areas of the world's oceans. Herein, we evaluated the dolphinfish industrial fishery in Pacific Panama for the first time generating a growth model and examining fluctuations in annual total catch and in catch per unit effort (CPUE) over a four-year period (2006-2009). Annual and monthly catch values and biological parameters of 14913 individuals were obtained onboard industrial vessels, landing sites and records from processing plants. Size frequency for industrial vessels showed a normal distribution between 353 and 1,715 mm (average, 1010.85 mm; n = 10,459). Fish weight averaged 4.94 kg (SD). Sex ratio was slightly biased toward females. More than 90% of the analyzed fish were sexually mature. The length-weight relationship was positive and significant, reflecting allometric growth. Growth parameters using the von Bertalanffy equation revealed a growth efficiency of θ = 4.61, which is within the reported range for Coryphaena hippurus (3.95-4.70). The largest fish were between age classes 2 and 3 (700 - 1400 mm). Total catch per year and catch per unit effort (CPUE) per year fluctuated, with the highest values recorded between 2008 and 2009. Catch values reported herein are preliminary and appear to be below those recorded elsewhere in the region and cautiously may represent an indicator of sustainable use of this marine resource even considering the absence of management actions in Panama.

  11. Fisheries Districts

    Data.gov (United States)

    Vermont Center for Geographic Information — The Fisheries districts data layer is part of a larger dataset that contains administrative boundaries for Vermont's Agency of Natural Resources. The dataset...

  12. Management of complex fisheries

    DEFF Research Database (Denmark)

    Frost, Hans Staby; Andersen, Peder; Hoff, Ayoe

    2013-01-01

    The purpose of this paper is to demonstrate how fisheries economics management issues or problems can be analyzed by using a complex model based on conventional bioeconomic theory. Complex simulation models contain a number of details that make them suitable for practical management advice......, including taking into account the response of the fishermen to implemented management measures. To demonstrate the use of complex management models this paper assesses a number of second best management schemes against a first rank optimum (FRO), an ideal individual transferable quotas (ITQ) system....... This is defined as the management scheme which produces the highest net present value over a 25 year period. The assessed management schemes (scenarios) are composed by several measures as used in the Common Fisheries Policy of the European Union for the cod fishery in the Baltic Sea. The scenarios are total...

  13. Hydroacoustic Evaluation of Overwintering Summer Steelhead Fallback and Kelt Passage at The Dalles Dam 2008-2009

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Fenton; Johnson, Gary E.; Weiland, Mark A.

    2009-09-01

    This report presents the results of an evaluation of overwintering summer steelhead (Oncorhynchus mykiss) fallback and early out-migrating steelhead kelts downstream passage at The Dalles Dam (TDA) sluiceway and turbines during fall/winter 2008 and early spring 2009, respectively. The study was conducted by the Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers, Portland District (USACE). Operating the sluiceway reduces the potential for hydropower production. However, this surface flow outlet may be the optimal non-turbine route for fallbacks in late fall after the sluiceway is typically closed for juvenile fish passage and for overwintering summer steelhead and kelt passage in the early spring before the start of the voluntary spill season. The goal of this study was to characterize adult steelhead spatial and temporal distributions and passage rates at the sluiceway and turbines, and their movements in front of the sluiceway at TDA to inform fisheries managers’ and engineers’ decision-making relative to sluiceway operations. The study periods were from November 1 to December 15, 2008 (45 days) and from March 1 to April 9, 2009 (40 days). The study objectives were to 1) estimate the number and distribution of overwintering summer steelhead fallbacks and kelt-sized acoustic targets passing into the sluiceway and turbines at TDA during the two study periods, respectively, and 2) assess the behavior of these fish in front of sluice entrances. We obtained fish passage data using fixed-location hydroacoustics and fish behavior data using acoustic imaging. For the overwintering summer steelhead, fallback occurred throughout the 45-day study period. We estimated that a total of 1790 ± 250 (95% confidence interval) summer steelhead targets passed through the powerhouse intakes and operating sluices during November 1 to December 15, 2008. Ninety five percent of these fish passed through the sluiceway. Therefore, without the sluiceway as

  14. Assessing Changes in Fisheries Using Fishers' Knowledge to Generate Long Time Series of Catch Rates: a Case Study from the Red Sea

    Directory of Open Access Journals (Sweden)

    Dawit Tesfamichael

    2014-03-01

    Full Text Available The data requirements for most quantitative fishery assessment models are extensive, and most of the fisheries in the world lack time series of the required biological and socioeconomic data. Many innovative approaches have been developed to improve data collection for fisheries. We explored the use of data from fishers' interviews to estimate time series of approximate "best" catch rates. A total of 472 standardized interviews were conducted with 423 fishers along the southern Red Sea coast recording the best catch recalled and the change in average catch rates throughout the fishing career of interviewees. The results showed a decline of best catch rates in all fisheries, ranging from 4% to 10% per year for more than 50 years. The estimated rates of decline of the typical catch were higher for fishers who started fishing in recent years, suggesting that the resource base is declining, in concordance with other indicators. It is suggested that analysis of approximate data, quickly acquired at low cost from fishers through interviews, can be used to supplement other data-recording systems or used independently to document the changes that have occurred in the resource base over a lifetime of fishing. The results can be used to guide the assessment and management of resources to conserve ecosystems and livelihoods.

  15. Modelling distribution of marine benthos from hydroacoustics and underwater video

    Science.gov (United States)

    Holmes, K. W.; Van Niel, K. P.; Radford, B.; Kendrick, G. A.; Grove, S. L.

    2008-08-01

    Broad-scale mapping of marine benthos is required for marine resource management and conservation. This study combines textural derivatives based on bathymetry from multibeam hydroacoustics with underwater video observations to model and map sessile biota between 10- and 60-m water depth over 35 km 2 in Point Addis Marine National Park (MNP), Vic., Australia. Classification tree models and maps were developed for macroalgae (all types, mixed red algae, Ecklonia, and rhodoliths) and sessile invertebrates (all types, sponges, and ascidians). Model accuracy was tested on 25% of the video observation dataset reserved from modelling. Models fit well for most macroalgae categories (correct classification rates of 67-84%), but are not as good for sessile invertebrate classes (correct classification rates of 57-62%). The poor fit of the sessile invertebrate models may be the combined result of grouping organisms with different environmental requirements and the effect of false absences recorded during video interpretation due to poor image quality. Probability maps, binary single-class maps, and multi-class maps supply spatially explicit, detailed information on the distribution of sessile benthic biota within the MNP and provide information at a landscape-scale for ecological investigations and marine management.

  16. Size-based hydroacoustic measures of within-season fish abundance in a boreal freshwater ecosystem.

    Directory of Open Access Journals (Sweden)

    Riley A Pollom

    Full Text Available Eleven sequential size-based hydroacoustic surveys conducted with a 200 kHz split-beam transducer during the summers of 2011 and 2012 were used to quantify seasonal declines in fish abundance in a boreal reservoir in Manitoba, Canada. Fish densities were sufficiently low to enable single target resolution and tracking. Target strengths converted to log2-based size-classes indicated that smaller fish were consistently more abundant than larger fish by a factor of approximately 3 for each halving of length. For all size classes, in both years, abundance (natural log declined linearly over the summer at rates that varied from -0.067 x day(-1 for the smallest fish to -0.016 x day(-1 for the largest (R2 = 0.24-0.97. Inter-annual comparisons of size-based abundance suggested that for larger fish (>16 cm, mean winter decline rates were an order of magnitude lower (-0.001 x day(-1 and overall survival higher (71% than in the main summer fishing season (mean loss rate -0.038 x day(-1; survival 33%. We conclude that size-based acoustic survey methods have the potential to assess within-season fish abundance dynamics, and may prove useful in long-term monitoring of productivity and hence management of boreal aquatic ecosystems.

  17. Methods for Calibrating Basin-Wide Hydroacoustic Propagation in the Indian Ocean

    Energy Technology Data Exchange (ETDEWEB)

    Blackman, D; de Groot-Hedlin, C; Orcutt, J A; Harben, P H; Clarke, D B; Ramirez, A L

    2004-10-11

    This collaborative project was designed to test and compare methods for achieving full ocean basin propagation of hydroacoustic signals in the 5-100 Hz frequency band. Plans for a systematic calibration of the International Monitoring System (IMS) for nuclear testing were under consideration in 2000/2001. The results from this project provide information to guide such planning for future ocean basin calibration work. Several acoustic source types were tested during two sea-going experiments and most were successful at generating signals that propagated hundreds to thousands of km to be recorded at the Indian Ocean IMS hydrophone stations. Development and numerical modeling of imploding glass sphere sources was one component of this testing. The intent was to design a relatively simple-to-use source that is not subject to restrictions that can limit use of explosive charges, but whose signal is large enough to propagate 100-1000's km range. Analysis of IMS hydrophone data recording during the experiments was used to illustrate the extent of energy loss during signal propagation and to assess the accuracy with which the small acoustic sources could be located using methods typically employed for nuclear monitoring.

  18. Hydroacoustic Evaluation of Juvenile Salmonid Passage at The Dalles Dam in 2004

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Hanks, Michael E.; Khan, Fenton; Cook, Chris B.; Hedgepeth, J; Mueller, Robert P.; Rakowski, Cynthia L.; Richmond, Marshall C.; Sargeant, Susan L.; Serkowski, John A.; Skalski, John R.

    2005-06-01

    The U.S. Army Corps of Engineers Portland District engaged the Pacific Northwest National Laboratory to evaluate juvenile salmon passage at The Dalles Dam in 2004 to inform decisions about long-term measures and operations to enhance sluiceway and spill passage and reduce turbine passage to improve smolt survival at the dam. PNNL used fixed-location hydroacoustic sampling across the entire project, especially at the sluiceway and spillway, using multiple split-beam transducers at selected locations. At the sluiceway nearfield, we used an acoustic camera to track fish. The fish data were interpreted and integrated with hydraulic data from a CFD model and in-field ADCP measurements. Two sluiceway operations were compared: West only (SL 1) vs. West+East (SL 1 + SL 18). Based on our findings, we concluded that The Dalles Dam sluiceway has the potential to be highly efficient and effective at passing juvenile salmonids. This potential could be tapped with hydraulic and entrance enhancements to the sluiceway. We recommended the following: (1) six rather than three sluice gates should be opened to take advantage of the maximum hydraulic capacity of the sluiceway. (2) The turbine units below open sluice gates should be operated as a standard fish operations procedure. (3) In 2005, the Corps and fisheries agencies should consider operating sluice gates in one or more of the following combinations of six gates: (a) SL 1-1, 1-2, 1-3 and SL 18-1, 18-2, 18-3 (repeat 2004 operation), (b) SL 1-1, 1-2, 1-3 and SL 11-1, 11-2, 11-3, or (c) SL 1-1, 1-2, 1-3 and SL 2-1, 2-2, 2-3. The following elements for surface flow bypasses which should be considered during design of any sluiceway enhancements at The Dalles Dam: (1) form an extensive surface flow bypass flow net (surface bypass discharge greater than {approx}7% of total project discharge), (2) create a gradual increase in water velocity approaching the surface flow bypass (ideally, acceleration < 1 m/s/m), (3) make water

  19. 75 FR 42378 - Fisheries of the South Atlantic; Southeast Data, Assessment, and Review (SEDAR); South Atlantic...

    Science.gov (United States)

    2010-07-21

    ... conditions, and recommends research and monitoring needs. The assessment is independently peer reviewed at...: August 6, 2010: 12 p.m. - 4 p.m. Assessment panelists will (1) discuss red snapper model base runs, (2... Data, Assessment, and Review (SEDAR); South Atlantic red snapper AGENCY: National Marine...

  20. Mixed fisheries forecasts – lessons learned from their initial application to North Sea fisheries

    DEFF Research Database (Denmark)

    Holmes, Steven J.; Ulrich, Clara; Reeves, Stuart A.

    2012-01-01

    the work with the existing single stock assessments. The explicit representation of the complexity of the fisheries also raises questions about the extent to which mixed fisheries science can be used to give „advice‟ in the traditional sense. This paper addresses the challenges and issues that have arisen...... through the practical implementation of mixed-fishery forecasts, then discusses the further developments that will be required to progress towards more integrated multi-stock management using mixed-fishery management plans...

  1. Mixed fisheries forecasts—lessons learned from their initial application to North Sea fisheries

    DEFF Research Database (Denmark)

    Holmes, S.J.; Ulrich, Clara; Reeves, S.A.

    2012-01-01

    the work with the existing single‐stock assessments. The explicit representation of the complexity of the fisheries also raises questions about the extent to which mixed fisheries science can be used to give ”advice” in the traditional sense. This paper addresses the challenges and issues that have arisen...... through the practical implementation of mixed‐fishery forecasts, then discusses the further developments that will be required to progress towards more integrated multistock management using mixed‐fishery management plans...

  2. NPRB 1319 Assessment of the benthic impacts of raised groundgear for the Eastern Bering Sea pollock fishery.

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Alaska pollock fishing industry, in collaboration with scientists at Alaska Pacific University, the Alaska Fisheries Science Center, and members of the fishing...

  3. Assessment and management of white mullet Mugil curema (Valencienne, 1836 (Mugilidae fisheries of the south coast of São Paulo state, Brazil

    Directory of Open Access Journals (Sweden)

    JT. Mendonça

    Full Text Available There is intense fishing activity, mainly artisanal, in the Cananéia, Iguape and Ilha Comprida Estuarine System. White mullet (Mugil curema is one of the local fishery resources and is usually caught with gillnets and fish traps. This study aimed to characterise the Mugil curema fisheries thereby underpinning the management of the species in the region. The study was developed with data collected from landings in the town of Cananéia, São Paulo state, Brazil, from 1995 to 2009. Production data, fishing effort and CPUE were used to assess the evolution of captures. The gillnets were characterised by interviewing fishermen from 16 communities in Cananéia. White mullet fishery has aroused the interest of fishermen in the region since the 80s and today it is one of the main products of artisanal estuarine fishery off the south coast of São Paulo. The major landings occur in the warmer months with fish traps and gillnets being the main fishing gear used. The largest catches occur in the spawning months of the species from October to April. The highest landings varied according to different fishing gear, showing differences primarily due to trade preferences and to the structure of the fishing gear. According to the index of abundance used in this study, the resource is overfished due to the progressive increase in fishing effort, so it is suggested that measures should be taken to control fishing effort, such as special fishing permits to catch white mullet, especially with gillnets. The current management measures neither meet the needs of fishermen nor the preservation of the resource, and must be reviewed in a participatory way with management agencies and the fishery sector, ensuring greater legitimacy and success in the sustainability of the activity.

  4. 76 FR 50719 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeastern Data, Assessment...

    Science.gov (United States)

    2011-08-16

    ... Mexico, and Caribbean; Southeastern Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... the SEDAR assessment schedule, budget, and the SEDAR process. See SUPPLEMENTARY INFORMATION. DATES... (866) SAFMC-10; fax: (843) 769-4520. SUPPLEMENTARY INFORMATION: The South Atlantic, Gulf of Mexico, and...

  5. Status and solutions for the world's unassessed fisheries.

    Science.gov (United States)

    Costello, Christopher; Ovando, Daniel; Hilborn, Ray; Gaines, Steven D; Deschenes, Olivier; Lester, Sarah E

    2012-10-26

    Recent reports suggest that many well-assessed fisheries in developed countries are moving toward sustainability. We examined whether the same conclusion holds for fisheries lacking formal assessment, which comprise >80% of global catch. We developed a method using species' life-history, catch, and fishery development data to estimate the status of thousands of unassessed fisheries worldwide. We found that small unassessed fisheries are in substantially worse condition than assessed fisheries, but that large unassessed fisheries may be performing nearly as well as their assessed counterparts. Both small and large stocks, however, continue to decline; 64% of unassessed stocks could provide increased sustainable harvest if rebuilt. Our results suggest that global fishery recovery would simultaneously create increases in abundance (56%) and fishery yields (8 to 40%).

  6. Nekton from Fishery-Independent Trawl Samples in U.S. Gulf of Mexico Estuaries: A Comparative Assessment of Gulf Estuarine Systems (CAGES), 1973-2007 (NODC Accession 0115183)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The purpose of CAGES (Comparative Assessment of Gulf Estuarine Systems) is to compile the fishery independent data from five Gulf States into a database to more...

  7. The Role of Women in Community-based Small-Scale Fisheries ...

    African Journals Online (AJOL)

    We assessed the role of gender in this fisheries management initiative, comparing fisheries landings for men ..... analysis of gender composition of the fishers. Octopus fishery closures .... our current understanding that fishers spend. Figure 3.

  8. Robustness of egg production methods as a fishery independent alternative to assess the Eastern Baltic cod stock (Gadus morhua callarias L.)

    DEFF Research Database (Denmark)

    Kraus, Gerd; Hinrichsen, Hans-Harald; Voss, Rüdiger;

    2012-01-01

    At present, several cod stocks are outside safe biological limits and are managed under recovery plans. For these stocks Total Allowable Catches (TAC's) are generally low and quotas are accompanied by a broad variety of technical measures influencing the fishing patterns. Consequently, the input...... data to stock assessment models relying on catch statistics from the commercial fisheries is potentially biased and the perception of stock status may be incorrect. Egg production methods (EPM) provide a fishery independent alternative. Additionally, they provide better estimates of stock reproductive...... potential (SRP). Eastern Baltic cod (Gad us morhua callarias L) has severely declined throughout the 2nd half of the 1980s and 1st half of the 1990s due to climate-driven adverse hydrographic conditions and high fishing intensity. Since 2007 the stock is managed under a long-term management plan and showed...

  9. Maintaining the competitiveness of the American fisheries society journals: an assessment based on influence and cost-effectiveness

    Science.gov (United States)

    Hewitt, David A.; Link, Jason S.; Steinich, Dave R.; Wahl, David H.; Mather, Martha E.

    2009-01-01

    Recent changes in the landscape of scientific publishing prompted the Publications Overview Committee of the American Fisheries Society (AFS) to review the Society's portfolio of scientific journals. We evaluated journals based on metrics in two categories: (1) citation-based measures of the influence of a journal on the scientific literature, and (2) measures of the cost-effectiveness of a journal (citation rate adjusted for subscription cost). Over the long-term, we found that ecology journals had far stronger citation-based influence than fisheries and aquatic sciences journals, and that journals publishing primarily basic research had stronger influence than journals publishing applied research (including four AFS journals and Fisheries magazine). In evaluating the current status of fisheries and aquatic sciences journals, we found that metrics of influence and cost-effectiveness provided considerably different portrayals of journals relative to their peers. In terms of citation-based influence, we found that the AFS journal Transactions of the American Fisheries Society (TAFS) and Fisheries magazine were competitive with highly regarded peer fisheries journals, but that North American Journal of Aquaculture (NAJA) and Journal of Aquatic Animal Health (JAAH) were less influential than their peers. The citation-based influence of North American Journal of Fisheries Management (NAJFM) was intermediate between TAFS/Fisheries and NAJA/JAAH. For journals like NAJFM and NAJA, we expect that much of the scientific influence on policy and management is not captured by citations in the primary literature, and alternative methods of evaluation may be needed. All of the AFS journals ranked highly with regard to cost-effectiveness because their subscription costs are low, and these rankings are in accordance with membership needs and the strategic mission of AFS to provide broad and timely dissemination of scientific information. We conclude by suggesting

  10. Dworshak Dam Impacts Assessment and Fisheries Investigation Project: Kokanee Entrainment Losses at Dworshak Reservoir, 1996 Annual Progress Report.

    Energy Technology Data Exchange (ETDEWEB)

    Maiolie, Melo A.; Elam, Steve

    1998-10-01

    We used split-beam hydroacoustics to monitor kokanee Oncorhynchus nerka kennerlyi abundance in Dworshak Reservoir from 1995 to 1996 in order to quantify the impacts of water releases from Dworshak Dam. The kokanee population was at a record high level of 1.9 million age-1 and age-2 fish (350 fish/ha) during June 1995. Large discharges of water during July and August of 1995 did not result in major losses of kokanee. Mid-winter flooding in February. March, and April of 1996: however, caused entrainment losses of 90% of all kokanee in the reservoir. The population declined to 140,000 kokanee. High flows during spring runoff used another 50% of the kokanee to be lost, further reducing the population to 71,000 fish (13 fish/ha). Entrainment losses were partially explainable by the distribution of kokanee in the reservoir. During winter, all age-classes of kokanee congregated near the dam making them susceptible to high releases of water. Kokanee appeared to be less susceptible to entrainment during summer and early fall because most kokanee were in other parts of the reservoir: adults were in the upper reservoir staging to spawn, fry were in the upper reservoir having emerged from tributary streams, and juvenile kokanee were spread throughout the reservoir.

  11. Introduction to fisheries oceanography

    Digital Repository Service at National Institute of Oceanography (India)

    Sumitra-Vijayaraghavan

    Fisheries oceanography can be applied to fisheries ecology, fisheries management and practical fishing. Physico-chemical parameters of the environment (temperature, currents, waves, light, oxygen and salinity) have profound effect on fish...

  12. Assessing reproductive behavior important to fisheries management: a case study with red drum, Sciaenops ocellatus.

    Science.gov (United States)

    Lowerre-barbieri, Susan K; Burnsed, Sarah L Walters; Bickford, Joel W

    2016-06-01

    Spawning site selection and reproductive timing affect stock productivity and structure in marine fishes but are poorly understood. Traditionally, stock assessments measure reproductive potential as spawning stock biomass or egg production and do not include other aspects of reproductive behavior. Red drum make an excellent case study to assess these other aspects, as (1) they are highly fecund, pelagic spawners, like most exploited marine fishes; (2) their life cycle is delineated between nursery (estuarine) and adult (coastal and offshore) habitat; and (3) they are managed at these two spatial scales. This study was conducted from August 2012 to December 2013 and integrates data from multiple methods and spatial scales. Aerial surveys were used for large-scale monitoring of aggregations off two known estuarine nursery areas, Tampa Bay and Charlotte Harbor, Florida, USA. Capture-based sampling in Tampa Bay coastal (n = 2581) and estuarine waters (n = 158) was used to assess reproductive state and to confirm coastal spawning. To assess spatial dynamics, we acoustically tagged two population components in the Tampa Bay system, subadults from the estuary (n = 20) and adults from the coastal spawning site (n = 60). Behavioral plasticity was seen in subadult recruitment to coastal habitat, with some subadults maturing and recruiting before or during the spawning season and others (14 of 20 acoustically tagged fish) recruiting at the end of the 2012 spawning season. Both adults and recruited subadults (n = 29) were consequently detected in the Charlotte Harbor array, 132 km to the south. Spawning-site fidelity to the Tampa Bay spawning site occurred at both the population and individual scales. Aggregations consistently occurred in Tampa Bay coastal waters during the spawning season, and approximately two-thirds of tagged adults returned in the 2013 spawning season. A similar proportion of subadults returned to the Tampa Bay spawning site, exhibiting natal homing

  13. Ocean zoning for conservation, fisheries and marine renewable energy: assessing trade-offs and co-location opportunities.

    Science.gov (United States)

    Yates, Katherine L; Schoeman, David S; Klein, Carissa J

    2015-04-01

    Oceans, particularly coastal areas, are getting busier and within this increasingly human-dominated seascape, marine biodiversity continues to decline. Attempts to maintain and restore marine biodiversity are becoming more spatial, principally through the designation of marine protected areas (MPAs). MPAs compete for space with other uses, and the emergence of new industries, such as marine renewable energy generation, will increase competition for space. Decision makers require guidance on how to zone the ocean to conserve biodiversity, mitigate conflict and accommodate multiple uses. Here we used empirical data and freely available planning software to identified priority areas for multiple ocean zones, which incorporate goals for biodiversity conservation, two types of renewable energy, and three types of fishing. We developed an approached to evaluate trade-offs between industries and we investigated the impacts of co-locating some fishing activities within renewable energy sites. We observed non-linear trade-offs between industries. We also found that different subsectors within those industries experienced very different trade-off curves. Incorporating co-location resulted in significant reductions in cost to the fishing industry, including fisheries that were not co-located. Co-location also altered the optimal location of renewable energy zones with planning solutions. Our findings have broad implications for ocean zoning and marine spatial planning. In particular, they highlight the need to include industry subsectors when assessing trade-offs and they stress the importance of considering co-location opportunities from the outset. Our research reinforces the need for multi-industry ocean-zoning and demonstrates how it can be undertaken within the framework of strategic conservation planning.

  14. Assessing gear modifications needed to optimize yields in a heavily exploited, multi-species, seagrass and coral reef fishery.

    Science.gov (United States)

    Hicks, Christina C; McClanahan, Timothy R

    2012-01-01

    Effective management is necessary if small-scale fisheries, such as those found in mixed habitats including seagrass and coral reefs, are to continue providing food for many of the poorest communities of the world. Gear-based management, although under represented and under studied, has the potential to be adaptive, address multiple objectives, and be crafted to the socio-economic setting. Management effectiveness in seagrass and coral reef fisheries has generally been evaluated at the scale of the fish community. However, community level indicators can mask species-specific declines that provide significant portions of the fisheries yields and income. Using a unique dataset, containing ten years of species level length frequency catch data from a multi-gear, multi-species seagrass and coral reef fishery in Kenya, we evaluate species specific fishery statuses, compare gear use to gear regulations and estimate the potential needs for further gear restrictions. Despite the high diversity of the fishery, fifteen species represented over 90% of the catch, and only three species represented 60% of the catch. The three most abundant species in the catch, Lethrinus lentjan (Lacepède), Siganus sutor (Valenciennes) and Leptoscarus vaigiensis (Quoy & Gaimard) all showed evidence of growth overfishing. Lethrinus lentjan, with an exploitation rate of 0.82, also shows evidence of recruitment overfishing. Current legal but weakly enforced gear restrictions are capable of protecting a significant portion of the catch up to maturity but optimization of yield will require that the current mesh size be increased from 6.3 to 8.8 and 9.2 cm to increase yields of L. lentjan and S. sutor, respectively. Given the difficulties of enforcing mesh size, we recommend that the economic benefits of these larger mesh sizes be communicated and enforced through co-management. This abstract is also available in Kiswahili (Abstract S1).

  15. Assessing gear modifications needed to optimize yields in a heavily exploited, multi-species, seagrass and coral reef fishery.

    Directory of Open Access Journals (Sweden)

    Christina C Hicks

    Full Text Available Effective management is necessary if small-scale fisheries, such as those found in mixed habitats including seagrass and coral reefs, are to continue providing food for many of the poorest communities of the world. Gear-based management, although under represented and under studied, has the potential to be adaptive, address multiple objectives, and be crafted to the socio-economic setting. Management effectiveness in seagrass and coral reef fisheries has generally been evaluated at the scale of the fish community. However, community level indicators can mask species-specific declines that provide significant portions of the fisheries yields and income. Using a unique dataset, containing ten years of species level length frequency catch data from a multi-gear, multi-species seagrass and coral reef fishery in Kenya, we evaluate species specific fishery statuses, compare gear use to gear regulations and estimate the potential needs for further gear restrictions. Despite the high diversity of the fishery, fifteen species represented over 90% of the catch, and only three species represented 60% of the catch. The three most abundant species in the catch, Lethrinus lentjan (Lacepède, Siganus sutor (Valenciennes and Leptoscarus vaigiensis (Quoy & Gaimard all showed evidence of growth overfishing. Lethrinus lentjan, with an exploitation rate of 0.82, also shows evidence of recruitment overfishing. Current legal but weakly enforced gear restrictions are capable of protecting a significant portion of the catch up to maturity but optimization of yield will require that the current mesh size be increased from 6.3 to 8.8 and 9.2 cm to increase yields of L. lentjan and S. sutor, respectively. Given the difficulties of enforcing mesh size, we recommend that the economic benefits of these larger mesh sizes be communicated and enforced through co-management. This abstract is also available in Kiswahili (Abstract S1.

  16. FISHERIES POLICY OF ICELAND

    Directory of Open Access Journals (Sweden)

    Tomislav Treer

    2008-04-01

    Full Text Available Fisheries has recently been very exploited area in the Croatian media, either regarding the EU accession negotiations or regarding the interrelationships of the involved parties within Croatia. Iceland is one of the strongest fishery nations in the world that passed through some heavy struggles to protect its fishery grounds (so called “fishery or cod wars”. Therefore its experience in fisheries can be useful when creating Croatian fishery policy. So, the aim of this article is to present the Statement on Responsible Fisheries in Iceland signed by all the parties involved in the Icelandic fishery industry.

  17. An Integrated Assessment Model for Helping the United States Sea Scallop (Placopecten magellanicus Fishery Plan Ahead for Ocean Acidification and Warming.

    Directory of Open Access Journals (Sweden)

    Sarah R Cooley

    Full Text Available Ocean acidification, the progressive change in ocean chemistry caused by uptake of atmospheric CO2, is likely to affect some marine resources negatively, including shellfish. The Atlantic sea scallop (Placopecten magellanicus supports one of the most economically important single-species commercial fisheries in the United States. Careful management appears to be the most powerful short-term factor affecting scallop populations, but in the coming decades scallops will be increasingly influenced by global environmental changes such as ocean warming and ocean acidification. In this paper, we describe an integrated assessment model (IAM that numerically simulates oceanographic, population dynamic, and socioeconomic relationships for the U.S. commercial sea scallop fishery. Our primary goal is to enrich resource management deliberations by offering both short- and long-term insight into the system and generating detailed policy-relevant information about the relative effects of ocean acidification, temperature rise, fishing pressure, and socioeconomic factors on the fishery using a simplified model system. Starting with relationships and data used now for sea scallop fishery management, the model adds socioeconomic decision making based on static economic theory and includes ocean biogeochemical change resulting from CO2 emissions. The model skillfully reproduces scallop population dynamics, market dynamics, and seawater carbonate chemistry since 2000. It indicates sea scallop harvests could decline substantially by 2050 under RCP 8.5 CO2 emissions and current harvest rules, assuming that ocean acidification affects P. magellanicus by decreasing recruitment and slowing growth, and that ocean warming increases growth. Future work will explore different economic and management scenarios and test how potential impacts of ocean acidification on other scallop biological parameters may influence the social-ecological system. Future empirical work on the

  18. An Integrated Assessment Model for Helping the United States Sea Scallop (Placopecten magellanicus) Fishery Plan Ahead for Ocean Acidification and Warming.

    Science.gov (United States)

    Cooley, Sarah R; Rheuban, Jennie E; Hart, Deborah R; Luu, Victoria; Glover, David M; Hare, Jonathan A; Doney, Scott C

    2015-01-01

    Ocean acidification, the progressive change in ocean chemistry caused by uptake of atmospheric CO2, is likely to affect some marine resources negatively, including shellfish. The Atlantic sea scallop (Placopecten magellanicus) supports one of the most economically important single-species commercial fisheries in the United States. Careful management appears to be the most powerful short-term factor affecting scallop populations, but in the coming decades scallops will be increasingly influenced by global environmental changes such as ocean warming and ocean acidification. In this paper, we describe an integrated assessment model (IAM) that numerically simulates oceanographic, population dynamic, and socioeconomic relationships for the U.S. commercial sea scallop fishery. Our primary goal is to enrich resource management deliberations by offering both short- and long-term insight into the system and generating detailed policy-relevant information about the relative effects of ocean acidification, temperature rise, fishing pressure, and socioeconomic factors on the fishery using a simplified model system. Starting with relationships and data used now for sea scallop fishery management, the model adds socioeconomic decision making based on static economic theory and includes ocean biogeochemical change resulting from CO2 emissions. The model skillfully reproduces scallop population dynamics, market dynamics, and seawater carbonate chemistry since 2000. It indicates sea scallop harvests could decline substantially by 2050 under RCP 8.5 CO2 emissions and current harvest rules, assuming that ocean acidification affects P. magellanicus by decreasing recruitment and slowing growth, and that ocean warming increases growth. Future work will explore different economic and management scenarios and test how potential impacts of ocean acidification on other scallop biological parameters may influence the social-ecological system. Future empirical work on the effect of ocean

  19. 76 FR 63904 - Pacific Fishery Management Council; Public Meetings

    Science.gov (United States)

    2011-10-14

    ... Species Management Measures for 2012 G. Habitat Current Habitat Issues H. Ecosystem Based Management 1. Northwest Fisheries Science Center Integrated Ecosystem Assessment Report 2. Development of a Council Ecosystem Fishery Management Plan I. Highly Migratory Species Management 1. Council Recommendations...

  20. Energy consumption in the Danish fishery

    DEFF Research Database (Denmark)

    Thrane, Mikkel

    2003-01-01

    Previous studies based on Life Cycle Assessment (LCA) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals...... that there are great differences in the fuel consumption between fisheries targeting ground or shellfish and those targeting pelagic or industrial fish....

  1. Evolutionary impact assessment: Accounting for the evolutionary consequences of fishing in an ecosystem approach to fisheries management

    DEFF Research Database (Denmark)

    Laugen, Ane T.; Engelhard, Georg H.; Whitlock, Rebecca

    2014-01-01

    substantial scientific attention recently is fisheries-induced evolution (FIE). Increasing evidence indicates that intensive fishing has the potential to exert strong directional selection on life-history traits, behaviour, physiology, and morphology of exploited fish. Of particular concern is that reversing...

  2. Hydroacoustic modelling and numerical simulation of unsteady operation of hydroelectric systems[Dissertation 3713

    Energy Technology Data Exchange (ETDEWEB)

    Nicolet, Ch.

    2007-03-15

    Hydropower represented in 1999 19% of the world electricity production and the absolute production is expected to grow considerably during the next 30 years. Francis turbines play a major role in the hydroelectric production due to their extended range of application. Due to the deregulated energy market, hydroelectric power plants are increasingly subjecting to off design operation, start-up and shutdown and new control strategies. Consequently, the operation of Francis turbine power plants leads to transients phenomena, risk of resonance or instabilities. The understanding of these propagation phenomena is therefore paramount. This work is a contribution to the hydroacoustic modelling of Francis turbine power plants for the investigation of the aforementioned problematic. The first part of the document presents the modelling of the dynamic behavior and the transient analysis of hydroelectric power plants. Therefore, the one-dimensional model of an elementary pipe is derived from the governing equations, i.e. momentum and continuity equations. The use of appropriate numerical schemes leads to a discrete model of the pipe consisting of a T-shaped equivalent electrical circuit. The accuracy in the frequency domain of the discrete model of the pipe is determined by comparison with the analytical solution of the governing equations. The modelling approach is extended to hydraulic components such as valve, surge tanks, surge shaft, air vessels, cavitation development, etc. Then, the modelling of the Francis, Pelton and Kaplan turbines for transient analysis purposes is presented. This modelling is based on the use of the static characteristic of the turbines. The hydraulic components models are implemented in the EPFL software SIMSEN developed for the simulation of electrical installations. After validation of the hydraulic models, transient phenomena in hydroelectric power plants are investigated. It appears that standard separate studies of either the hydraulic or of

  3. Fishery stock assessment of Kiddi shrimp ( Parapenaeopsis stylifera) in the Northern Arabian Sea Coast of Pakistan by using surplus production models

    Science.gov (United States)

    Mohsin, Muhammad; Mu, Yongtong; Memon, Aamir Mahmood; Kalhoro, Muhammad Talib; Shah, Syed Baber Hussain

    2017-07-01

    Pakistani marine waters are under an open access regime. Due to poor management and policy implications, blind fishing is continued which may result in ecological as well as economic losses. Thus, it is of utmost importance to estimate fishery resources before harvesting. In this study, catch and effort data, 1996-2009, of Kiddi shrimp Parapenaeopsis stylifera fishery from Pakistani marine waters was analyzed by using specialized fishery software in order to know fishery stock status of this commercially important shrimp. Maximum, minimum and average capture production of P. stylifera was observed as 15 912 metric tons (mt) (1997), 9 438 mt (2009) and 11 667 mt/a. Two stock assessment tools viz. CEDA (catch and effort data analysis) and ASPIC (a stock production model incorporating covariates) were used to compute MSY (maximum sustainable yield) of this organism. In CEDA, three surplus production models, Fox, Schaefer and Pella-Tomlinson, along with three error assumptions, log, log normal and gamma, were used. For initial proportion (IP) 0.8, the Fox model computed MSY as 6 858 mt (CV=0.204, R 2 =0.709) and 7 384 mt (CV=0.149, R 2 =0.72) for log and log normal error assumption respectively. Here, gamma error produced minimization failure. Estimated MSY by using Schaefer and Pella-Tomlinson models remained the same for log, log normal and gamma error assumptions i.e. 7 083 mt, 8 209 mt and 7 242 mt correspondingly. The Schafer results showed highest goodness of fit R 2 (0.712) values. ASPIC computed MSY, CV, R 2, F MSY and B MSY parameters for the Fox model as 7 219 mt, 0.142, 0.872, 0.111 and 65 280, while for the Logistic model the computed values remained 7 720 mt, 0.148, 0.868, 0.107 and 72 110 correspondingly. Results obtained have shown that P. stylifera has been overexploited. Immediate steps are needed to conserve this fishery resource for the future and research on other species of commercial importance is urgently needed.

  4. Fishery stock assessment of Kiddi shrimp (Parapenaeopsis stylifera) in the Northern Arabian Sea Coast of Pakistan by using surplus production models

    Science.gov (United States)

    Mohsin, Muhammad; Mu, Yongtong; Memon, Aamir Mahmood; Kalhoro, Muhammad Talib; Shah, Syed Baber Hussain

    2016-09-01

    Pakistani marine waters are under an open access regime. Due to poor management and policy implications, blind fishing is continued which may result in ecological as well as economic losses. Thus, it is of utmost importance to estimate fishery resources before harvesting. In this study, catch and effort data, 1996-2009, of Kiddi shrimp Parapenaeopsis stylifera fishery from Pakistani marine waters was analyzed by using specialized fishery software in order to know fishery stock status of this commercially important shrimp. Maximum, minimum and average capture production of P. stylifera was observed as 15 912 metric tons (mt) (1997), 9 438 mt (2009) and 11 667 mt/a. Two stock assessment tools viz. CEDA (catch and effort data analysis) and ASPIC (a stock production model incorporating covariates) were used to compute MSY (maximum sustainable yield) of this organism. In CEDA, three surplus production models, Fox, Schaefer and Pella-Tomlinson, along with three error assumptions, log, log normal and gamma, were used. For initial proportion (IP) 0.8, the Fox model computed MSY as 6 858 mt (CV=0.204, R 2=0.709) and 7 384 mt (CV=0.149, R 2=0.72) for log and log normal error assumption respectively. Here, gamma error produced minimization failure. Estimated MSY by using Schaefer and Pella-Tomlinson models remained the same for log, log normal and gamma error assumptions i.e. 7 083 mt, 8 209 mt and 7 242 mt correspondingly. The Schafer results showed highest goodness of fit R 2 (0.712) values. ASPIC computed MSY, CV, R 2, F MSY and B MSY parameters for the Fox model as 7 219 mt, 0.142, 0.872, 0.111 and 65 280, while for the Logistic model the computed values remained 7 720 mt, 0.148, 0.868, 0.107 and 72 110 correspondingly. Results obtained have shown that P. stylifera has been overexploited. Immediate steps are needed to conserve this fishery resource for the future and research on other species of commercial importance is urgently needed.

  5. Dworshak Dam Impact Assessment and Fishery Investigation and Trout, Bass and Forage Species: Combined Project Completion Report.

    Energy Technology Data Exchange (ETDEWEB)

    Maiolie, Melo; Statler, David P.; Elam, Steve

    1992-10-01

    The Nez Perce Tribe (NPT) and the Idaho Department of Fish and Game (IDFG) entered into separate intergovernmental agreements with the Bonneville Power Administration in a cooperative four-year effort to study impacts of Dworshak Dam operation on resident fisheries. The NPT Department of Fisheries Management focused on rainbow trout, smallmouth bass and forage fish. The IDFG's segment of the project was to document kokanee population dynamics, relate it to the changing nutrient status of the reservoir, evaluate kokanee losses through Dworshak Dam, and make kokanee management recommendations. This final report includes findings for 1990 and 1991 and relates these data to information previously presented in annual reports for 1987, 1988 and 1989.

  6. Hydroacoustic estimates of fish biomass and spatial distributions in shallow lakes

    Science.gov (United States)

    Lian, Yuxi; Huang, Geng; Godlewska, Małgorzata; Cai, Xingwei; Li, Chang; Ye, Shaowen; Liu, Jiashou; Li, Zhongjie

    2017-03-01

    We conducted acoustical surveys with a horizontal beam transducer to detect fish and with a vertical beam transducer to detect depth and macrophytes in two typical shallow lakes along the middle and lower reaches of the Changjiang (Yangtze) River in November 2013. Both lakes are subject to active fish management with annual stocking and removal of large fish. The purpose of the study was to compare hydroacoustic horizontal beam estimates with fish landings. The preliminary results show that the fish distribution patterns differed in the two lakes and were affected by water depth and macrophyte coverage. The hydroacoustically estimated fish biomass matched the commercial catch very well in Niushan Lake, but it was two times higher in Kuilei Lake. However, acoustic estimates included all fish, whereas the catch included only fish >45 cm (smaller ones were released). We were unable to determine the proper regression between acoustic target strength and fish length for the dominant fish species in the two lakes.

  7. Risk assessment and uncertainty of the shrimp trawl fishery in the Gulf of California considering environmental variability

    Directory of Open Access Journals (Sweden)

    Luis César Almendarez-Hernández

    2015-09-01

    Full Text Available The shrimp fishery off the Mexican Pacific coast is the country's most important fishery from the economic standpoint. However, it faces serious problems, including the fleet's overcapitalization and age, in addition to the environmental variability that affects the size of catches. Thus, this activity depends on a variety of factors that add uncertainty to the profitability of fishing vessels. This study aims to estimate the probability of success and economic risk of "type vessels" under two different environmental variability scenarios in the Gulf of California. The results from the economic simulation pointed to the vessel type used in Guaymas (Sonora as the most efficient one under a neutral climate change scenario, showing a homogeneous behaviour in physical characteristics and mode of operation. By contrast, under a scenario of a monotonic rise in sea surface temperature, the shrimp fishery faces a greater risk of incurring economic losses. The simulated climate behaviour scenarios revealed that the activity involves a moderate economic profitability under the neutral scenario; however, under the warming scenario, profitability may be low or even nil due to the risks and uncertainty resulting from the influence of environmental phenomena.

  8. MASSACHUSETTS DIVISION OF FISHERIES AND WILDLIFE ADAPTATION PLANNING USING AN EXPERT PANEL BASED HABITAT VULNERABLITY ASSESSMENT John O'Leary, MA Div. of Fisheries and Wildlife and Hector Galbraith, Ph d. Climate Change Initiative, Manomet Center for Conservation Sciences

    Science.gov (United States)

    O'Leary, J. A.; Galbraith, H.

    2010-12-01

    We are using the results from a recently completed Habitat Vulnerability Assessment (HVA) for adaptation planning within the Massachusetts Division of Fisheries and Wildlife. We used Regional Downscale Climate Projections to provide exposure information for the assessment and an Expert Panel of biologists to provide information on the sensitivity and adaptive capacity of the habitat types we assessed. We estimated the vulnerability of 22 key habitat types which were identified in the State Wildlife Action Plan (SWAP). Results of the expert panel based HVA include a relative ranking of vulnerability to climate change for these habitats within Massachusetts, a confidence score for the estimated vulnerability for each habitat type evaluated and a narrative identifying the factors which influence the vulnerability of the habitat. We also evaluated the vulnerability of the Species in Greatest Conservation Need (SGCN) from the SWAP to climate change conditions. The SGCN are linked to their primary habitat types. The HVA results along with recommendations from the National Academies Report: Adapting to the Impacts of Climate Change America’s Climate Choices: Panel on Adapting to the Impacts of Climate Change will inform “climate smart” adaptation strategies for agency management, acquisition, and research and monitoring programs that build on and do not replace existing implementation strategies. We believe that the adaptation planning process that we outline in this presentation could serve as a model for resource agencies and others who are in the process of developing their response to anticipated impacts from climate change conditions. We are also engaged in a collaborative effort to conduct a Regional Habitat Vulnerability Assessment (RHVA). Results form the RHVA will provide the MDFW with the ability to assess adaptation strategies based on regional need.

  9. 75 FR 27989 - North Pacific Fishery Management Council; Public Meetings

    Science.gov (United States)

    2010-05-19

    ... and fishery overlap; review Pacific cod assessment model run proposals (SSC only); review Council... - initial/final action. 10. Staff Tasking: Review Committees and tasking. 11. Other Business The SSC agenda... Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE 3510-22-S...

  10. 76 FR 20959 - Pacific Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-04-14

    ... Pacific mackerel stock assessment for 2011, in order to inform fisheries management decisions for the 2011... National Oceanic and Atmospheric Administration RIN 0648-XA366 Pacific Fishery Management Council; Public... (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The Pacific Fishery Management...

  11. Energy consumption in the Danish fishery

    DEFF Research Database (Denmark)

    Thrane, Mikkel

    2003-01-01

    Previous studies based on Life Cycle Assessment (LCA) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals that th...... that there are great differences in the fuel consumption between fisheries targeting ground or shellfish and those targeting pelagic or industrial fish.......Previous studies based on Life Cycle Assessment (LCA) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals...

  12. Development and validation of hydroacoustic monitoring concepts for the coastal German Bight (SE North Sea)

    Science.gov (United States)

    Mielck, Finn; Hass, H. Christian; Holler, Peter; Bartholomä, Alexander; Neumann, Andreas; Kröncke, Ingrid; Reimers, Hans-Christian; Capperucci, Ruggero

    2016-04-01

    The joint research project WIMO (Wissenschaftliche Monitoringkonzepte für die Deutsche Bucht/Scientific Monitoring Concepts for the German Bight, NE North Sea) aims at providing methods for detection and analysis of seabed habitats using modern remote sensing techniques. Our subproject focuses on hydroacoustic techniques in order to gain information about seafloor environments and sediment dynamics. In a timeframe of four years, several key areas in the German Bight were repeatedly observed using different hydroacoustic gear (i. e. sidescan sonars, single/multibeam echo sounders and sub-bottom profilers). In order to ground-truth the acoustic data, hundreds of grab samples and underwater videos were taken. With these techniques it is possible to distinguish between different seafloor habitats, which range from muddy to sandy seafloors (esp. near the barrier islands) to rugged or vegetated/populated reefs around Helgoland. The conducted monitoring program revealed seasonal changes regarding the abundance of the sand mason worm (Lanice conchilega) and the brittle star (Amphiora filiformis) as well as ongoing sedimentary processes driven by tidal currents and wind/storms. It was also possible to determine relationships between sediment characteristics and benthos in some key areas. An essential part of our project included a comparison between the datasets obtained with different hydroacoustic devices, configurations, and evaluation methods in the same study areas. The investigation reveals that there could be distinct differences in interpreting the data and hence in the determination of prevailing seafloor habitats, especially in very heterogeneous areas and at transition zones between the habitats. Therefore, it is recommended to employ more than one hydroacoustic system (preferably a singlebeam device combined with a wide-swath sonar system) synchronously during a survey in order to gain more reliable and detailed information about the seafloor environments. The

  13. Fisheries-induced disruptive selection.

    Science.gov (United States)

    Landi, Pietro; Hui, Cang; Dieckmann, Ulf

    2015-01-21

    Commercial harvesting is recognized to induce adaptive responses of life-history traits in fish populations, in particular by shifting the age and size at maturation through directional selection. In addition to such evolution of a target stock, the corresponding fishery itself may adapt, in terms of fishing policy, technological progress, fleet dynamics, and adaptive harvest. The aim of this study is to assess how the interplay between natural and artificial selection, in the simplest setting in which a fishery and a target stock coevolve, can lead to disruptive selection, which in turn may cause trait diversification. To this end, we build an eco-evolutionary model for a size-structured population, in which both the stock׳s maturation schedule and the fishery׳s harvest rate are adaptive, while fishing may be subject to a selective policy based on fish size and/or maturity stage. Using numerical bifurcation analysis, we study how the potential for disruptive selection changes with fishing policy, fishing mortality, harvest specialization, life-history tradeoffs associated with early maturation, and other demographic and environmental parameters. We report the following findings. First, fisheries-induced disruptive selection is readily caused by commonly used fishing policies, and occurs even for policies that are not specific for fish size or maturity, provided that the harvest is sufficiently adaptive and large individuals are targeted intensively. Second, disruptive selection is more likely in stocks in which the selective pressure for early maturation is naturally strong, provided life-history tradeoffs are sufficiently consequential. Third, when a fish stock is overexploited, fisheries targeting only large individuals might slightly increase sustainable yield by causing trait diversification (even though the resultant yield always remains lower than the maximum sustainable yield that could be obtained under low fishing mortality, without causing disruptive

  14. Application of the Systems Impact Assessment Model (SIAM) to Fishery Resource Issues in the Klamath River, California

    Science.gov (United States)

    Campbell, Sharon G.; Bartholow, John M.; Heasley, John

    2010-01-01

    At the request of two offices of the U.S. Fish and Wildlife Service (FWS) located in Yreka and Arcata, Calif., we applied the Systems Impact Assessment Model (SIAM) to analyze a variety of water management concerns associated with the Federal Energy Regulatory Commission (FERC) relicensing of the Klamath hydropower projects or with ongoing management of anadromous fish stocks in the mainstem Klamath River, Oregon and California. Requested SIAM analyses include predicted effects of reservoir withdrawal elevations, use of full active storage in Copco and Iron Gate Reservoirs to augment spring flows, and predicted spawning and juvenile outmigration timing of fall Chinook salmon. In an effort to further refine the analysis of spring flow effects on predicted fall Chinook production, additional SIAM analyses were performed for predicted response to spring flow release variability from Iron Gate Dam, high and low pulse flow releases, the predicted effects of operational constraints for both Upper Klamath Lake water surface elevations, and projected flow releases specified in the Klamath Project 2006 Operations Plan (April 10, 2006). Results of SIAM simulations to determine flow and water temperature relationships indicate that up to 4 degrees C of thermal variability can be attributed to flow variations, but the effect is seasonal. Much more of thermal variability can be attributed to air temperature variations, up to 6 degrees C. Reservoirs affect the annual thermal signature by delaying spring warming by about 3 weeks and fall cooling by about 2 weeks. Multi-level release outlets on Iron Gate Dam would have limited utility; however, if releases are small (700 cfs) and a near-surface and bottom-level outlet could be blended, then water temperature may be reduced by 2-4 degrees C for a 4-week period during September. Using the full active storage in Copco and Iron Gate Reservoir, although feasible, had undesirable ramifications such as earlier spring warming, loss of

  15. Acoustic telemetry and fisheries management

    Science.gov (United States)

    Crossin, Glenn T.; Heupel, Michelle R.; Holbrook, Christopher; Hussey, Nigel E.; Lowerre-Barbieri, Susan K; Nguyen, Vivian M.; Raby, Graham D.; Cooke, Steven J.

    2017-01-01

    This paper reviews the use of acoustic telemetry as a tool for addressing issues in fisheries management, and serves as the lead to the special Feature Issue of Ecological Applications titled “Acoustic Telemetry and Fisheries Management”. Specifically, we provide an overview of the ways in which acoustic telemetry can be used to inform issues central to the ecology, conservation, and management of exploited and/or imperiled fish species. Despite great strides in this area in recent years, there are comparatively few examples where data have been applied directly to influence fisheries management and policy. We review the literature on this issue, identify the strengths and weaknesses of work done to date, and highlight knowledge gaps and difficulties in applying empirical fish telemetry studies to fisheries policy and practice. We then highlight the key areas of management and policy addressed, as well as the challenges that needed to be overcome to do this. We conclude with a set of recommendations about how researchers can, in consultation with stock assessment scientists and managers, formulate testable scientific questions to address and design future studies to generate data that can be used in a meaningful way by fisheries management and conservation practitioners. We also urge the involvement of relevant stakeholders (managers, fishers, conservation societies, etc.) early on in the process (i.e. in the co-creation of research projects), so that all priority questions and issues can be addressed effectively.

  16. 75 FR 17070 - Fisheries in the Western Pacific; Hawaii Bottomfish and Seamount Groundfish Fisheries; Fishery...

    Science.gov (United States)

    2010-04-05

    ... National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-XU60 Fisheries in the Western Pacific; Hawaii Bottomfish and Seamount Groundfish Fisheries; Fishery Closure AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ]...

  17. Fishery Performance Indicators

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Performance indicators for landings, effort, revenue and distribution of revenue are collected for various fisheries nation-wide. The fisheries include catch and...

  18. Energy consumption in the Danish fishery

    DEFF Research Database (Denmark)

    Thrane, Mikkel

    2004-01-01

    Previous studies based on life-cycle assessment (LCA) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of certain fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals...... that there are great differences in fuel consumption between fisheries targeting groundfish or shellfish and those targeting pelagic fish or industrial fish. Here, I show that fuel consumption per kilogram of caught fish varies considerably as a function of fishing gear and vessel size, even considering the same......) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of certain fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals that there are great differences in fuel consumption between...

  19. Hydroacoustic Evaluation of Overwintering Summer Steelhead Fallback and Kelt Passage at The Dalles Dam Turbines, Early Spring 2011

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Fenton; Royer, Ida M.

    2012-02-01

    This report presents the results of an evaluation of overwintering summer steelhead (Oncorhynchus mykiss) fallback and early out-migrating steelhead kelts downstream passage at The Dalles Dam turbines during early spring 2011. The study was conducted by Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers, Portland District (USACE) to investigate whether adult steelhead are passing through turbines during early spring before annual sluiceway operations typically begin. The sluiceway surface flow outlet is the optimal non-turbine route for adult steelhead, although operating the sluiceway reduces hydropower production. This is a follow-up study to similar studies of adult steelhead passage at the sluiceway and turbines we conducted in the fall/winter 2008, early spring 2009, fall/winter 2009, and early spring 2010. The goal of the 2011 study was to characterize adult steelhead passage rates at the turbines while the sluiceway was closed so fisheries managers would have additional information to use in decision-making relative to sluiceway operations. Sluiceway operations were not scheduled to begin until April 10, 2011. However, based on a management decision in late February, sluiceway operations commenced on March 1, 2011. Therefore, this study provided estimates of fish passage rates through the turbines, and not the sluiceway, while the sluiceway was open. The study period was March 1 through April 10, 2011 (41 days total). The study objective was to estimate the number and distribution of adult steelhead and kelt-sized targets passing into turbine units. We obtained fish passage data using fixed-location hydroacoustics with transducers deployed at all 22 main turbine units at The Dalles Dam. Adult steelhead passage through the turbines occurred on 9 days during the study (March 9, 12, 30, and 31 and April 2, 3, 5, 7, and 9). We estimated a total of 215 {+-} 98 (95% confidence interval) adult steelhead targets passed through the

  20. 75 FR 34049 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2010-06-16

    ... assessment of changes to other fishery management plans that may impact skates, and determine if changes to... updated biological and socio-economic information regarding the skate complex and its associated fisheries... Amendment 3 and its proposed rule focused on the expected negative economic impacts of the...

  1. Impact assessment of a fisheries closure with effort and landings spatial analyses: A case study in the Western Baltic Sea

    DEFF Research Database (Denmark)

    Miethe, Tanja; Bastardie, Francois; Dorrien, Christian von;

    2014-01-01

    Link connectingDenmark and Germany could lead to the temporal closure of fishing activities. Three different effort-displacement scenarios were tested to determine how lost landings, caused by a fishing closure of acorridor near the link during construction, could be counteracted by moving...... the activities to a nearfieldarea. To compensate for lost landings, the best strategy appears to be redistributing fishing effort of sprat-targeting métiers to areas that have had relatively high catch rates (landings per unit of effort (LPUE))or with large absolute sprat landings, assuming spatial stability...... of sprat distribution in the area. Becausehigh effort did not lead to large sprat landings in all locations, effort displacement to high effort areas maynot compensate for lost sprat landings, particularly for mixed fishery métiers that also landed herring...

  2. A critical assessment of marine aquarist biodiversity data and commercial aquaculture: identifying gaps in culture initiatives to inform local fisheries managers.

    Science.gov (United States)

    Murray, Joanna M; Watson, Gordon J

    2014-01-01

    It is widely accepted that if well managed, the marine aquarium trade could provide socio-economic stability to local communities while incentivising the maintenance of coral reefs. However, the trade has also been implicated as having potentially widespread environmental impacts that has in part driven developments in aquaculture to relieve wild collection pressures. This study investigates the biodiversity in hobbyist aquaria (using an online survey) and those species currently available from an aquaculture source (commercial data and hobbyist initiatives) in the context of a traffic light system to highlight gaps in aquaculture effort and identify groups that require fisheries assessments. Two hundred and sixty nine species including clown fish, damsels, dotty backs, angelfish, gobies, sea horses and blennies, have reported breeding successes by hobbyists, a pattern mirrored by the European and US commercial organisations. However, there is a mismatch (high demand and low/non-existent aquaculture) for a number of groups including tangs, starfish, anemones and hermit crabs, which we recommend are priority candidates for local stock assessments. Hobbyist perception towards the concept of a sustainable aquarium trade is also explored with results demonstrating that only 40% of respondents were in agreement with industry and scientists who believe the trade could be an exemplar of a sustainable use of coral reefs. We believe that a more transparent evidence base, including the publication of the species collected and cultured, will go some way to align the concept of a sustainable trade across industry stakeholders and better inform the hobbyist when purchasing their aquaria stock. We conclude by proposing that a certification scheme established with government support is the most effective way to move towards a self-regulating industry. It would prevent industry "greenwashing" from multiple certification schemes, alleviate conservation concerns, and, ultimately

  3. A critical assessment of marine aquarist biodiversity data and commercial aquaculture: identifying gaps in culture initiatives to inform local fisheries managers.

    Directory of Open Access Journals (Sweden)

    Joanna M Murray

    Full Text Available It is widely accepted that if well managed, the marine aquarium trade could provide socio-economic stability to local communities while incentivising the maintenance of coral reefs. However, the trade has also been implicated as having potentially widespread environmental impacts that has in part driven developments in aquaculture to relieve wild collection pressures. This study investigates the biodiversity in hobbyist aquaria (using an online survey and those species currently available from an aquaculture source (commercial data and hobbyist initiatives in the context of a traffic light system to highlight gaps in aquaculture effort and identify groups that require fisheries assessments. Two hundred and sixty nine species including clown fish, damsels, dotty backs, angelfish, gobies, sea horses and blennies, have reported breeding successes by hobbyists, a pattern mirrored by the European and US commercial organisations. However, there is a mismatch (high demand and low/non-existent aquaculture for a number of groups including tangs, starfish, anemones and hermit crabs, which we recommend are priority candidates for local stock assessments. Hobbyist perception towards the concept of a sustainable aquarium trade is also explored with results demonstrating that only 40% of respondents were in agreement with industry and scientists who believe the trade could be an exemplar of a sustainable use of coral reefs. We believe that a more transparent evidence base, including the publication of the species collected and cultured, will go some way to align the concept of a sustainable trade across industry stakeholders and better inform the hobbyist when purchasing their aquaria stock. We conclude by proposing that a certification scheme established with government support is the most effective way to move towards a self-regulating industry. It would prevent industry "greenwashing" from multiple certification schemes, alleviate conservation concerns

  4. Re-establishment of the IMS Hydroacoustic Station HA04, Crozet Islands, France.

    Science.gov (United States)

    Haralabus, Georgios; Stanley, Jerry; Zampolli, Mario; Grenard, Patrick; Nielsen, Peter; Le Bras, Ronan; Brown, David; Bittner, Paulina; Wang, Haijun; Gore, Jane; Amir, Menachem; Bereza, Slava

    2017-04-01

    The incorporation of the hydroacoustic station HA04, Crozet Islands, France, into the International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO) is a 17 year saga that had a happy ending on 29 December 2016. On that day, following a major engineering and logistical undertaking, the station was successfully installed. While still in its initial testing phase, HA04 sends continuously quality data at the International Data Centre (IDC), pending official certification and promotion to mainstream operational status. Similarly to most other cabled hydroacoustic stations in the IMS, HA04 is comprised of two triplets of moored hydrophones deployed on both sides of Possession Island (Crozet Islands) sending uninterrupted data to a shore facility via submarine fiber optic cables. The designed frequency pass-band is 1 - 100 Hz. Data are relayed to Vienna via a shore based satellite link in real time. According to CTBTO's standard requirements, the design life of HA04 is at least 20 years, maintenance-free for the underwater system. An outline of the main phases of this project, highlights from the installation operations and examples of received hydroacoustic signals associated with recent underwater seismic activity in the Indian Ocean as well as vocalizations from marine mammals acquired by the new HA04 are presented here. HA04 is scheduled to be fully integrated into the operational platform of IDC in the next six months, which will enable registered researchers to access archived monitoring data and processing software, or via the National Data Centres (NDCs).

  5. Inland capture fisheries.

    Science.gov (United States)

    Welcomme, Robin L; Cowx, Ian G; Coates, David; Béné, Christophe; Funge-Smith, Simon; Halls, Ashley; Lorenzen, Kai

    2010-09-27

    The reported annual yield from inland capture fisheries in 2008 was over 10 million tonnes, although real catches are probably considerably higher than this. Inland fisheries are extremely complex, and in many cases poorly understood. The numerous water bodies and small rivers are inhabited by a wide range of species and several types of fisher community with diversified livelihood strategies for whom inland fisheries are extremely important. Many drivers affect the fisheries, including internal fisheries management practices. There are also many drivers from outside the fishery that influence the state and functioning of the environment as well as the social and economic framework within which the fishery is pursued. The drivers affecting the various types of inland water, rivers, lakes, reservoirs and wetlands may differ, particularly with regard to ecosystem function. Many of these depend on land-use practices and demand for water which conflict with the sustainability of the fishery. Climate change is also exacerbating many of these factors. The future of inland fisheries varies between continents. In Asia and Africa the resources are very intensely exploited and there is probably little room for expansion; it is here that resources are most at risk. Inland fisheries are less heavily exploited in South and Central America, and in the North and South temperate zones inland fisheries are mostly oriented to recreation rather than food production.

  6. Lake Roosevelt Fisheries Evaluation Program, Part A; Fisheries Creel Survey and Population Status Analysis, 1998 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Spotts, Jim; Shields, John; Underwood, Keith

    2002-05-01

    1997, with 97 percent of tag recoveries from rainbow trout coming from below Grand Coulee Dam. High water years appear to have substantial entrainment impacts on salmonids. The 1998 salmonid harvest has improved from the previous two years, due to the relatively water friendly year of 1998, from the harvest observed in the 1996-1997 high water years, which were particularly detrimental to the reservoir salmonid fisheries. Impacts from those water years are still evident in the reservoir fish populations. Analysis of historical relative species abundance, tagging data and hydroacoustical studies, indicate that hydro-operations have a substantial influence on the annual standing crop of reservoir salmonid populations due to entrainment losses, and limited prey species recruitment, due to reservoir elevation level fluctuation, and corresponding reproductive success.

  7. Ecosystem approach to inland fisheries: research needs and implementation strategies

    Science.gov (United States)

    Beard, T. Douglas; Arlinghaus, Robert; Cooke, Steven J.; McIntyre, Peter B.; De Silva, Sena; Bartley, Devin M.; Cowx, Ian G.

    2011-01-01

    Inland fisheries are a vital component in the livelihoods and food security of people throughout the world, as well as contributing huge recreational and economic benefits. These valuable assets are jeopardized by lack of research-based understanding of the impacts of fisheries on inland ecosystems, and similarly the impact of human activities associated with inland waters on fisheries and aquatic biodiversity. To explore this topic, an international workshop was organized in order to examine strategies to incorporate fisheries into ecosystem approaches for management of inland waters. To achieve this goal, a new research agenda is needed that focuses on: quantifying the ecosystem services provided by fresh waters; quantifying the economic, social and nutritional benefits of inland fisheries; improving assessments designed to evaluate fisheries exploitation potential; and examining feedbacks between fisheries, ecosystem productivity and aquatic biodiversity. Accomplishing these objectives will require merging natural and social science approaches to address coupled social–ecological system dynamics.

  8. 75 FR 51002 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-08-18

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment Webinar 6 for SEDAR 22 Yellowedge... assessment webinar 6. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper... stock assessment and input data. Participants for SEDAR Workshops are appointed by the Gulf of Mexico...

  9. Management effectiveness of the world's marine fisheries.

    Directory of Open Access Journals (Sweden)

    Camilo Mora

    2009-06-01

    Full Text Available Ongoing declines in production of the world's fisheries may have serious ecological and socioeconomic consequences. As a result, a number of international efforts have sought to improve management and prevent overexploitation, while helping to maintain biodiversity and a sustainable food supply. Although these initiatives have received broad acceptance, the extent to which corrective measures have been implemented and are effective remains largely unknown. We used a survey approach, validated with empirical data, and enquiries to over 13,000 fisheries experts (of which 1,188 responded to assess the current effectiveness of fisheries management regimes worldwide; for each of those regimes, we also calculated the probable sustainability of reported catches to determine how management affects fisheries sustainability. Our survey shows that 7% of all coastal states undergo rigorous scientific assessment for the generation of management policies, 1.4% also have a participatory and transparent processes to convert scientific recommendations into policy, and 0.95% also provide for robust mechanisms to ensure the compliance with regulations; none is also free of the effects of excess fishing capacity, subsidies, or access to foreign fishing. A comparison of fisheries management attributes with the sustainability of reported fisheries catches indicated that the conversion of scientific advice into policy, through a participatory and transparent process, is at the core of achieving fisheries sustainability, regardless of other attributes of the fisheries. Our results illustrate the great vulnerability of the world's fisheries and the urgent need to meet well-identified guidelines for sustainable management; they also provide a baseline against which future changes can be quantified.

  10. Management effectiveness of the world's marine fisheries.

    Science.gov (United States)

    Mora, Camilo; Myers, Ransom A; Coll, Marta; Libralato, Simone; Pitcher, Tony J; Sumaila, Rashid U; Zeller, Dirk; Watson, Reg; Gaston, Kevin J; Worm, Boris

    2009-06-16

    Ongoing declines in production of the world's fisheries may have serious ecological and socioeconomic consequences. As a result, a number of international efforts have sought to improve management and prevent overexploitation, while helping to maintain biodiversity and a sustainable food supply. Although these initiatives have received broad acceptance, the extent to which corrective measures have been implemented and are effective remains largely unknown. We used a survey approach, validated with empirical data, and enquiries to over 13,000 fisheries experts (of which 1,188 responded) to assess the current effectiveness of fisheries management regimes worldwide; for each of those regimes, we also calculated the probable sustainability of reported catches to determine how management affects fisheries sustainability. Our survey shows that 7% of all coastal states undergo rigorous scientific assessment for the generation of management policies, 1.4% also have a participatory and transparent processes to convert scientific recommendations into policy, and 0.95% also provide for robust mechanisms to ensure the compliance with regulations; none is also free of the effects of excess fishing capacity, subsidies, or access to foreign fishing. A comparison of fisheries management attributes with the sustainability of reported fisheries catches indicated that the conversion of scientific advice into policy, through a participatory and transparent process, is at the core of achieving fisheries sustainability, regardless of other attributes of the fisheries. Our results illustrate the great vulnerability of the world's fisheries and the urgent need to meet well-identified guidelines for sustainable management; they also provide a baseline against which future changes can be quantified.

  11. Prospects of hydroacoustic detection of ultra-high and extremely high energy cosmic neutrinos

    Science.gov (United States)

    Dedenko, L. G.; Karlik, Ya. S.; Learned, J. G.; Svet, V. D.; Zheleznykh, I. M.

    2001-07-01

    The prospects of construction of deep underwater neutrino telescopes in the world's oceans for the goals of ultra-high and super-high energy neutrino astrophysics (astronomy) using acoustic technologies are reviewed. The effective detection volume of the acoustic neutrino telescopes can be far greater than a cubic kilometer for extreme energies. In recent years, it was proposed that an existing hydroacoustic array of 2400 hydrophones in the Pacific Ocean near Kamchatka Peninsula could be used as a test base for an acoustic neutrino telescope SADCO (Sea-based Acoustic Detector of Cosmic Objects) which should be capable of detecting acoustic signals produced in water by the cosmic neutrinos with energies 1019-21 eV (e.g., topological defect neutrinos). We report on simulations of super-high energy electron-hadron and electron-photon cascades with the Landau-Pomeranchuk-Migdal effect taken into account. Acoustic signals emitted by neutrino-induced cascades with energies 1020-21 eV were calculated. The possibilities of using a converted hydroacoustic station MG-10 (MG-10M) of 132 hydrophones as a basic module for a deep water acoustic neutrino detector with the threshold detection energy 1015 eV in the Mediterranean Sea are analyzed (with the aim of searching for neutrinos with energies 1015-16 eV from Active Galactic Nuclei). .

  12. Hydroacoustic simulation of rotor-stator interaction in resonance conditions in Francis pump-turbine

    Energy Technology Data Exchange (ETDEWEB)

    Nicolet, C [Power Vision Engineering sarl, Ch. des Champs-Courbes 1, CH-1024 Ecublens (Switzerland); Ruchonnet, N; Alligne, S; Avellan, F [EPFL Laboratory for Hydraulic Machines, Av. de Cour 33bis, CH-1007 Lausanne (Switzerland); Koutnik, J, E-mail: christophe.nicolet@powervision-eng.c [Voith Hydro Holding GmbH and Co. KG, Alexanderstr. 11, 89522 Heidenheim (Germany)

    2010-08-15

    Combined effect of rotating pressure field related to runner blade and wakes of wicket gates leads to rotor stator interactions, RSI, in Francis pump-turbines. These interactions induce pressures waves propagating in the entire hydraulic machine. Superposition of those pressure waves may result in standing wave in the spiral casing and rotating diametrical mode in the guide vanes and can cause strong pressure fluctuations and vibrations. This paper presents the modeling, simulation and analysis of Rotor-Stator Interaction of a scale model of a Francis pump-turbine and related test rig using a one-dimensional approach. The hydroacoustic modeling of the Francis pump-turbine takes into account the spiral casing, the 20 guide vanes, the 9 rotating runner vanes. The connection between stationary and rotating parts is ensured by a valve network driven according to the unsteady flow distribution between guide vanes and runner vanes. Time domain simulations are performed for 2 different runner rotational speeds in turbine mode. The simulation results are analyzed in frequency domain and highlights hydroacoustic resonance between RSI excitations and the spiral case. Rotating diametrical mode in the vaneless gap and standing wave in the spiral case are identified. The influence of the resonance on phase and amplitude of pressure fluctuations obtained for both the spiral case and the vaneless gap is analyzed. The mode shape and frequencies are confirmed using eigenvalues analysis.

  13. 75 FR 51983 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-08-24

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment Webinar for SEDAR 23 Goliath Grouper...), Commerce. ACTION: Notice of SEDAR 23 Gulf of Mexico and South Atlantic goliath grouper assessment webinar. SUMMARY: The SEDAR 23 assessment of the Gulf of Mexico and South Atlantic stock of goliath grouper will...

  14. 75 FR 56991 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-09-17

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); assessment webinar 7 for SEDAR 22 yellowedge... and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 7. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks...

  15. 75 FR 45605 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-08-03

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); assessment webinar 5 for SEDAR 22 yellowedge... Administration (NOAA), Commerce. ACTION: Notice of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 5. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper...

  16. 75 FR 78975 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-12-17

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment Webinar 9 for SEDAR 22 Yellowedge... Administration (NOAA), Commerce. ACTION: Notice of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 9. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper...

  17. 75 FR 63810 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-10-18

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Assessment Webinar 8 for SEDAR 22 Yellowedge... Administration (NOAA), Commerce. ACTION: Notice of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 8. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper...

  18. 75 FR 28565 - Fisheries of the South Atlantic and the Gulf of Mexico; Southeast Data, Assessment, and Review...

    Science.gov (United States)

    2010-05-21

    ... monitoring needs. The assessment is independently peer reviewed at the Review Workshop. The product of the... original SEDAR benchmark assessment and run the benchmark assessment model to update population estimates... adopted during the Data Webinar, participants will employ assessment models used in SEDAR 8 to...

  19. 77 FR 38738 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2012-06-29

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BB35 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for the Southern New England Skate Bait Trawl Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and...

  20. 75 FR 1023 - International Fisheries Regulations; Fisheries in the Western Pacific; Pelagic Fisheries; Hawaii...

    Science.gov (United States)

    2010-01-08

    ... CFR Part 665 [Docket No. 080225267-91393-03] RIN 0648-AW49 International Fisheries Regulations; Fisheries in the Western Pacific; Pelagic Fisheries; Hawaii-based Shallow-set Longline Fishery; Correction AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration...

  1. 77 FR 25117 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2012-04-27

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BB35 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for the Southern New England Skate Bait Trawl Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and...

  2. 77 FR 64305 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2012-10-19

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BC50 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for the Cape Cod Spiny Dogfish Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration...

  3. Population dynamics and stock assessment for Octopus maya (Cephalopoda: Octopodidae) fishery in the Campeche Bank, Gulf of Mexico.

    Science.gov (United States)

    Arreguín-Sánchez, F; Solís-Ramírez, M J; González de la Rosa, M E

    2000-01-01

    The octopus (Octopus maya) is one of the most important fish resources in the Mexican Gulf of Mexico with a mean annual yield of 9000 ton, and a reasonable number of jobs created; O. maya represents 80% of the total octopus catch, followed by Octopus vulgaris. There are two artisanal fleets based on Octopus maya and a middle-size fleet that covers both species. Catch-at-length structured data from the artisanal fleets, for the 1994 season (August 1st to December 15th) were used to analyze the O. maya population dynamics and stock and to estimate the current level of exploitation. Von Bertalanffy growth parameters were: L infinity = 252 mm, mantle length; K = 1.4 year-1; oscillation parameters C = 1.0, WP = 0.6; and tz = 0.842 years. A rough estimate of natural mortality was M = 2.2, total mortality from catch curve Z = 8.77, and exploitation rate F/Z = 0.75. This last value suggests an intensive exploitation, even when yield per recruit analysis indicates both fleets may increase the minimum legal size on about 10% to increase yields. The length-based VPA also shows that the stock is being exploited under its maximum acceptable biological limit. These apparently contradictory results are explained by biological and behavioral characteristics of this species. Because most females die after reproduction, a new gross estimation of natural mortality was computed as M = 3.3. The new estimate of exploitation rate was F/Z = 0.57. This new value coincides with results from the length-VPA and the Thompson and Bell methods, the former suggesting that a reduction of 20% in fishing mortality may provide larger yields. This fishery resource is fully exploited and current management measures must be revised to sustain and probably optimize yields.

  4. 75 FR 2489 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2010-01-15

    ... Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR) Steering Committee; Public Meeting... addition of a Goliath Grouper benchmark assessment, and additional Gulf of Mexico tilefish stocks to be... meet via conference call to discuss timing of assessment projects for 2010, progress on procedural...

  5. 78 FR 68817 - Fisheries of the South Atlantic and the Gulf of Mexico; Southeast Data, Assessment and Review...

    Science.gov (United States)

    2013-11-15

    ... of Mexico; Southeast Data, Assessment and Review (SEDAR); Public Meetings AGENCY: National Marine... 38 stock assessment of South Atlantic and Gulf of Mexico King Mackerel: A Data Workshop; an... stock assessment and input data. Participants for SEDAR Workshops are appointed by the Gulf of Mexico...

  6. 78 FR 54867 - Fisheries of the South Atlantic, Gulf of Mexico, and Caribbean; Southeast Data, Assessment, and...

    Science.gov (United States)

    2013-09-06

    ... Mexico, and Caribbean; Southeast Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National... and assessment schedule. See SUPPLEMENTARY INFORMATION. DATES: The SEDAR Steering Committee will meet... of discussion are as follows: 1. Review progress of ongoing assessment projects. ] 2. Discuss SEDAR...

  7. 75 FR 20985 - Fisheries of the South Atlantic and Gulf of Mexico; Southeastern Data, Assessment, and Review...

    Science.gov (United States)

    2010-04-22

    ... Mexico; Southeastern Data, Assessment, and Review (SEDAR); Public Meeting AGENCY: National Marine... of SEDAR 22 Gulf of Mexico yellowedge grouper and tilefish assessment webinar 1. SUMMARY: The SEDAR 22 assessments of the Gulf of Mexico stocks of yellowedge grouper and tilefish will consist of a...

  8. 77 FR 35358 - Fisheries of the South Atlantic; Southeast Data, Assessment, and Review (SEDAR); Gulf of Mexico...

    Science.gov (United States)

    2012-06-13

    ... Data, Assessment, and Review (SEDAR); Gulf of Mexico and South Atlantic Spanish Mackerel (Scomberomorus... Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice. SUMMARY: Four Assessment...: The SEDAR 28 Assessment Workshops via webinar will be held July 10, 2012, July 24, 2012, August 9...

  9. Energy consumption in the Danish fishery

    DEFF Research Database (Denmark)

    Thrane, Mikkel

    2004-01-01

    that there are great differences in fuel consumption between fisheries targeting groundfish or shellfish and those targeting pelagic fish or industrial fish. Here, I show that fuel consumption per kilogram of caught fish varies considerably as a function of fishing gear and vessel size, even considering the same...... fisheries targeting groundfish or shellfish and those targeting pelagic fish or industrial fish. Here, I show that fuel consumption per kilogram of caught fish varies considerably as a function of fishing gear and vessel size, even considering the same target species. I argue that these differences need......Previous studies based on life-cycle assessment (LCA) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of certain fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals...

  10. Hydroacoustic investigation of the emissions of gas from the seabed in fieldwork and experimental studies

    Science.gov (United States)

    Tomczyk, M.; Bohrmann, G.; Wright, I. C.; Sahling, H.; Waldmann, C.

    2012-04-01

    The investigation of the fate of rising bubbles from the seabed is of increasing importance, to be able to quantify the potential input to atmospheric methane (CH4). Hydroacoustic methods seem to be the most sensitive and reliable way to remotely determine bubble fluxes over a large area. The advantage of noninvasive remote sensing methods can be used to better understand the role of cold seep sites in global climate changes. During two cruises in 2011 (R/V Meteor cruise M84/2 in the Black Sea in February and RSS James Ross Clark JCR253 arctic cruise in August) a combination of several techniques was evaluated for detection, localization and classification of gas emissions from natural cold seeps, including a detailed hydroacoustic survey of investigated areas and data analysis with the use of specialized software. Acoustic data were collected using different echosounders and platforms: two multibeam systems EM122 and EM710, multifrequency echosounder EK60, and parametric narrow-beam Parasound echosunder. Detailed location maps of gas seeps, and 3D visualization models showing the registered flares were obtained. All hydroacoustic intruments provided evidence of acoustic anomalies in the water column, related to the strong impedance step between the free gas (bubbles) and the surrounding water. On echograms, rising bubbles often appear as flare-shaped reflections, simply called "flares". Most of these flares do not reach the sea-surface, nevertheless, some of gas bubble plumes rising up to several hundred meters above the seabed. Flares do not rise straight upwards but are deflected in a direction of current, which can be seen after processing multibeam echosounder data. Matlab codes were used in order to process data coming from EK60 fish-finder echosunder. These data can be used for quantification of gas bubble emissions. Bathymetry data sets exported from MB-System with 2 m horizontal resolution were examined in Fledermaus software for further cleaning

  11. AFSC/REFM: Beaufort Sea Marine Fish Survey, Beaufort Sea, Alaska, August 2008, Fisheries Interaction Team

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Alaska Fisheries Science Center's Status of Stocks and Multispecies Assessment (SSMA) Programs Fishery Interaction Team (FIT) conducted a fish survey in the...

  12. 75 FR 39918 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2010-07-13

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); goliath grouper. AGENCY: National Marine... of SEDAR Workshop for South Atlantic and Gulf of Mexico goliath grouper. SUMMARY: The SEDAR assessments of the South Atlantic and Gulf of Mexico stocks of goliath grouper will consist of a series of...

  13. 76 FR 81479 - Fisheries of the South Atlantic and Gulf of Mexico; Southeast Data, Assessment, and Review (SEDAR...

    Science.gov (United States)

    2011-12-28

    ... Mexico; Southeast Data, Assessment, and Review (SEDAR); Spanish Mackerel and Cobia AGENCY: National...: Notice of SEDAR Workshops for South Atlantic and Gulf of Mexico Spanish mackerel and cobia. SUMMARY: The SEDAR assessments of the South Atlantic and Gulf of Mexico stocks of Spanish mackerel and cobia will...

  14. 75 FR 9397 - Fisheries of the South Atlantic and the Gulf of Mexico; Southeastern Data, Assessment, and Review...

    Science.gov (United States)

    2010-03-02

    ... of Mexico; Southeastern Data, Assessment, and Review (SEDAR); Spiny Lobster AGENCY: National Marine... of SEDAR Webinars and Workshop for South Atlantic and Gulf of Mexico spiny lobster. SUMMARY: The SEDAR update of the assessment of the South Atlantic and Gulf of Mexico stock of spiny lobster will...

  15. Population dynamics and stock assessment for Octopus maya (Cephalopoda:Octopodidae fishery in the Campeche Bank, Gulf of Mexico

    Directory of Open Access Journals (Sweden)

    Francisco Arreguín-Sánchez

    2000-06-01

    Full Text Available The octopus (Octopus maya is one of the most important fish resources in the Mexican Gulf of Mexico with a mean annual yield of 9000 ton, and a reasonable number of jobs created; O. maya represents 80% of the total octopus catch, followed by Octopus vulgaris. There are two artisanal fleets based on Octopus maya and a middle-size fleet that covers both species. Catch-at-length structured data from the artisanal fleets, for the 1994 season (August 1st to December 15th were used to analyze the O. maya population dynamics and stock and to estimate the current level of exploitation. Von Bertalanffy growth parameters were: L = 252 mm, mantle length; K=1.4 year -1; oscillation parameters C=1.0, WP=0.6; and tz=0.842 years. A rough estimate of natural mortality was M=2.2, total mortality from catch curve Z=8.77, and exploitation rate F/Z=0.75. This last value suggests an intensive exploitation, even when yield per recruit analysis indicates both fleets may increase the minimum legal size on about 10% to increase yields. The length-based VPA also shows that the stock is being exploited under its maximum acceptable biological limit. These apparently contradictory results are explained by biological and behavioral characteristics of this species. Because most females die after reproduction, a new gross estimation of natural mortality was computed as M=3.3. The new estimate of exploitation rate was F/Z=0.57. This new value coincides with results from the length-VPA and the Thompson and Bell methods, the former suggesting that a reduction of 20% in fishing mortality may provide larger yields. This fishery resource is fully exploited and current management measures must be revised to sustain and probably optimize yields.Octopus maya es uno de los recursos pesqueros más importantes del Golfo de México, con rendimientos anuales promedio de 9 000 t, y constituye el 80% de la captura total, seguido por O. vulgaris. En la pesquería participan dos flotas

  16. CURRENT STATE OF FISHERIES AND ASSESSMENT OF FISH STOCKS IN THE WESTERN MIDDLE OF THE CASPIAN SEA. PROSPECTS FOR THE USE OF THE FISH RESOURCES

    Directory of Open Access Journals (Sweden)

    A. S. Abdusamadov

    2016-01-01

    Full Text Available Aim. To aim is to assess stocks and the fisheries of aquatic biological resources in the western part of the middle Caspian Sea and perspectives for the use of their resource potential.Methods. On the basis of the literature sources and our own data on the fish inventory in the western part of the Middle Caspian, we discuss possible reasons for emerging environmental, economic and other problems in the use of biological resources.Results. The main negative factors are the large-scale poaching, resulting in a catastrophic reduction in stocks of sturgeon and other valuable fish species of the Caspian Sea, a natural penetration of alien organisms (Mnemiopsis and overfishing of some species. The potential danger is large-scale development of oil and gas fields in the Caspian Sea, which can lead to even worse situation for the biological resources of the sea.Conclusions. In order to preserve the biological resources of the sea it is necessary to create conditions for steadily developing fishing and fish processing enterprises, thus ensuring the satisfaction of the constant demand for fish products and an increase in the revenue base of the budget and the well-being of the Russian population.

  17. Hydroacoustic Evaluation of Juvenile Salmonid Passage and Distribution at Lookout Point Dam, 2010

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Fenton; Johnson, Gary E.; Royer, Ida M.; Hughes, James S.; Fischer, Eric S.; Trott, Donna M.; Ploskey, Gene R.

    2011-07-01

    This report presents the results of an evaluation of juvenile salmonid passage and distribution at Lookout Point Dam (LOP) on the Middle Fork Willamette River. The study was conducted by the Pacific Northwest National Laboratory for the U.S. Army Corps of Engineers, Portland District (USACE). The goal of the study was to provide fish passage and distribution data to support decisions on long-term measures to enhance downstream passage at LOP and others dams in USACE’s Willamette Valley Project in response to the listing of Upper Willamette River Spring Chinook salmon (Oncorhynchus tshawytscha) and Upper Willamette River steelhead (O. mykiss) as threatened under the Endangered Species Act. During the year-long study period - February 1, 2010 to January 31, 2011the objectives of the hydroacoustic evaluation of fish passage and distribution at LOP were to: 1. Estimate passage rates, run timing, horizontal distribution, and diel distribution at turbine penstock intakes for smolt-size fish. 2. Estimate passage rates, run timing and diel distribution at turbine penstock intakes for small-size fish. 3. Estimate passage rates and run timing at the regulating outlets for smolt-size fish. 4. Estimate vertical distribution of smolt-size fish in the forebay near the upstream face of the dam. The fixed-location hydroacoustic technique was used to accomplish the objectives of this study. Transducers (420 kHz) were deployed in each penstock intake, above each RO entrance, and on the dam face; a total of nine transducers (2 single-beam and 7 split-beam) were used. We summarize the findings from the hydroacoustic evaluation of juvenile salmonid passage and distribution at LOP during February 2010 through January 2011 as follows. • Fish passage rates for smolt-size fish (> ~90 mm) were highest during December-January and lowest in mid-summer through early fall. • During the entire study period, an estimated total of 142,463 fish ± 4,444 (95% confidence interval) smolt

  18. Lattice Boltzmann approach for hydro-acoustic waves generated by tsunamigenic sea bottom displacement

    Science.gov (United States)

    Prestininzi, P.; Abdolali, A.; Montessori, A.; Kirby, J. T.; La Rocca, Michele

    2016-11-01

    Tsunami waves are generated by sea bottom failures, landslides and faults. The concurrent generation of hydro-acoustic waves (HAW), which travel much faster than the tsunami, has received much attention, motivated by their possible exploitation as precursors of tsunamis. This feature makes the detection of HAW particularly well-suited for building an early-warning system. Accuracy and efficiency of the modeling approaches for HAW thus play a pivotal role in the design of such systems. Here, we present a Lattice Boltzmann Method (LBM) for the generation and propagation of HAW resulting from tsunamigenic ground motions and verify it against commonly employed modeling solutions. LBM is well known for providing fast and accurate solutions to both hydrodynamics and acoustics problems, thus it naturally becomes a candidate as a comprehensive computational tool for modeling generation and propagation of HAW.

  19. Assessing an Adaptive Cycle in a Social System under External Pressure to Change: the Importance of Intergroup Relations in Recreational Fisheries Governance

    Directory of Open Access Journals (Sweden)

    Robert Arlinghaus

    2011-06-01

    Full Text Available The adaptive cycle constitutes a heuristic originally used to interpret the dynamics of complex ecosystems in response to disturbance and change. It is assumed that socially constructed governance systems go through similar phases (K, Ω [omega], α [alpha], r as evident in ecological adaptive cycles. Two key dimensions of change shaping the four phases of an adaptive cycle are the degree of connectedness and the range of potential in the system. Our purpose was to quantitatively assess the four phases of the adaptive cycle in a social system by measuring the potential and connectedness dimensions and their different levels in each of the four phases. We assessed these dimensions using quantitative data from content analysis of magazine articles describing the transition process of East German recreational fisheries governance after the fall of the Berlin Wall in 1989. This process was characterized by the discussion of two governance alternatives amendable for implementation: a central East German and a decentralized West German approach. Contrary to assumptions in the adaptive cycle heuristic, we were unable to identify the four phases of the adaptive cycle in our governance system based on quantitatively assessed levels of connectedness and potential alone. However, the insertion of in-group (East Germans and out-group (West Germans dimensions representing the two governance alternatives in our analysis enabled us to identify the specific time frames for all four phases of the adaptive cycle on a monthly basis. These findings suggest that an unmodified "figure-eight model" of the adaptive cycle may not necessarily hold in social systems. Inclusion of disciplinary theories such as intergroup relation theory will help in understanding adaptation processes in social systems.

  20. Hydroacoustic measures of Mysis relicta abundance and distribution in Lake Ontario

    Science.gov (United States)

    Rudstam, L. G.; Schaner, T.; Gal, G.; Boscarino, B.T.; O'Gorman, R.; Warner, D.M.; Johannsson, O.E.; Bowen, K.L.

    2008-01-01

    Mysis relicta can be observed on echograms as a sound scattering layer when they migrate into the water column at night to feed on zooplankton. However, quantitative measures of mysid abundance with hydroacoustics requires knowledge of mysid target strength (TS), a method of removing fish echoes and contribution from noise, and an understanding of the effect of range on the ability of hydroacoustics to detect mysids (the detection limit). Comparisons of paired net data and acoustics data from July 7, 2005 yielded a mysid TS of -86.3 dB (9 mm animal) and a biomass TS of -58.4 dB (g dry wt)-1. With ambient noise levels (Sv of -125 dB at 1 m depth) and this TS, we can detect a mysid density of 1 m-3 at 60 m depth with a signal to noise ratio of 3 dB. We present a method to remove backscattering from both noise and fish and apply this method and the new TS data to whole lake acoustic data from Lake Ontario collected in July 25-31, 2005 with a 120 kHz echosounder as part of the annual standard fish survey in that lake. Mysis abundance was strongly depth dependent, with highest densities in areas with bottom depth > 100 m, and few mysids in areas with bottom depth 100 m, 100-75 m, 75-50 m, 50-30 m, < 30 m), the whole-lake average mysid density was 118 m-2 (CV 21%) and the whole-lake average mysid biomass was 0.19 g dry wt m-2 (CV 22%) in July 2005. The CVs of these densities also account for uncertainty in the TS estimates. This is comparable to whole-lake density estimates using vertical net tows in November, 2005 (93 m-2, CV 16%). Copyright ?? 2008 AEHMS.

  1. A moving target--incorporating knowledge of the spatial ecology of fish into the assessment and management of freshwater fish populations.

    Science.gov (United States)

    Cooke, Steven J; Martins, Eduardo G; Struthers, Daniel P; Gutowsky, Lee F G; Power, Michael; Doka, Susan E; Dettmers, John M; Crook, David A; Lucas, Martyn C; Holbrook, Christopher M; Krueger, Charles C

    2016-04-01

    Freshwater fish move vertically and horizontally through the aquatic landscape for a variety of reasons, such as to find and exploit patchy resources or to locate essential habitats (e.g., for spawning). Inherent challenges exist with the assessment of fish populations because they are moving targets. We submit that quantifying and describing the spatial ecology of fish and their habitat is an important component of freshwater fishery assessment and management. With a growing number of tools available for studying the spatial ecology of fishes (e.g., telemetry, population genetics, hydroacoustics, otolith microchemistry, stable isotope analysis), new knowledge can now be generated and incorporated into biological assessment and fishery management. For example, knowing when, where, and how to deploy assessment gears is essential to inform, refine, or calibrate assessment protocols. Such information is also useful for quantifying or avoiding bycatch of imperiled species. Knowledge of habitat connectivity and usage can identify critically important migration corridors and habitats and can be used to improve our understanding of variables that influence spatial structuring of fish populations. Similarly, demographic processes are partly driven by the behavior of fish and mediated by environmental drivers. Information on these processes is critical to the development and application of realistic population dynamics models. Collectively, biological assessment, when informed by knowledge of spatial ecology, can provide managers with the ability to understand how and when fish and their habitats may be exposed to different threats. Naturally, this knowledge helps to better evaluate or develop strategies to protect the long-term viability of fishery production. Failure to understand the spatial ecology of fishes and to incorporate spatiotemporal data can bias population assessments and forecasts and potentially lead to ineffective or counterproductive management actions.

  2. A moving target—incorporating knowledge of the spatial ecology of fish into the assessment and management of freshwater fish populations

    Science.gov (United States)

    Cooke, Steven J.; Martins, Eduardo G; Struthers, Daniel P; Gutowsky, Lee F G; Powers, Michael H.; Doka, Susan E; Dettmers, John M.; Crook, David A; Lucas, Martyn C.; Holbrook, Christopher; Krueger, Charles C.

    2016-01-01

    Freshwater fish move vertically and horizontally through the aquatic landscape for a variety of reasons, such as to find and exploit patchy resources or to locate essential habitats (e.g., for spawning). Inherent challenges exist with the assessment of fish populations because they are moving targets. We submit that quantifying and describing the spatial ecology of fish and their habitat is an important component of freshwater fishery assessment and management. With a growing number of tools available for studying the spatial ecology of fishes (e.g., telemetry, population genetics, hydroacoustics, otolith microchemistry, stable isotope analysis), new knowledge can now be generated and incorporated into biological assessment and fishery management. For example, knowing when, where, and how to deploy assessment gears is essential to inform, refine, or calibrate assessment protocols. Such information is also useful for quantifying or avoiding bycatch of imperiled species. Knowledge of habitat connectivity and usage can identify critically important migration corridors and habitats and can be used to improve our understanding of variables that influence spatial structuring of fish populations. Similarly, demographic processes are partly driven by the behavior of fish and mediated by environmental drivers. Information on these processes is critical to the development and application of realistic population dynamics models. Collectively, biological assessment, when informed by knowledge of spatial ecology, can provide managers with the ability to understand how and when fish and their habitats may be exposed to different threats. Naturally, this knowledge helps to better evaluate or develop strategies to protect the long-term viability of fishery production. Failure to understand the spatial ecology of fishes and to incorporate spatiotemporal data can bias population assessments and forecasts and potentially lead to ineffective or counterproductive management actions.

  3. Hydroacoustic Evaluation of Overwintering Summer Steelhead Fallback and Kelt Passage at The Dalles Dam, 2009-2010

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Fenton; Johnson, Gary E.; Weiland, Mark A.

    2010-07-31

    This report presents the results of an evaluation of overwintering summer steelhead (Oncorhynchus mykiss) fallback and early out-migrating steelhead kelts downstream passage at The Dalles Dam (TDA) sluiceway and turbines during fall/winter 2009 through early spring 2010. The study was conducted by the Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers, Portland District (USACE). The goal of this study was to characterize adult steelhead spatial and temporal distributions and passage rates at the sluiceway and turbines for fisheries managers and engineers to use in decision-making relative to sluiceway operations. The study was from November 1, 2009 to April 10, 2010. The study was divided into three study periods: Period 1, November 1 - December 15, 2009 for a fall/winter sluiceway and turbine study; Period 2, December 16, 2009 - February 28, 2010 for a turbine only study; Period 3, March 1 - April 10, 2010 for a spring sluiceway and turbine study. Sluiceway operations were scheduled to begin on March 1 for this study; however, because of an oil spill cleanup near the sluice outfall, sluiceway operations were delayed until March 8, 2010, therefore the spring study period did not commence until March 8. The study objectives were to (1) estimate the number and distribution of overwintering summer steelhead fallbacks and kelt-sized acoustic targets passing into the sluiceway and turbines at TDA between November 1 and December 15, 2009 and March 1 and April 10, 2010, and (2) estimate the numbers and distribution of adult steelhead and kelt-sized targets passing into turbine units between December 16, 2009 and February 28, 2010. We obtained fish passage data using fixed-location hydroacoustics. For Period 1, overwintering summer steelhead fallback occurred throughout the 45-day study period. A total of 879 {+-} 165 (95% CI) steelhead targets passed through the powerhouse and sluiceway during November 1 to December 15, 2009. Ninety two

  4. Lake Pend Oreille Fishery Recovery Project, 1998-1999 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Maiolie, Melo A.; Ament, William J.; Harryman, Bill (Idaho Department of Fish and Game, Boise, ID)

    2001-12-01

    The minimum water level of Lake Pend Oreille was raised from 625.1 m to 626.4 m elevation during the winter of 1998-99 in an attempt to recover the impacted kokanee Oncorhynchus nerka fishery. This report covers the third year of testing higher winter levels. Hydroacoustic surveys and mid-water trawling were conducted in the fall of 1999 to assess the kokanee population. We estimated the abundance of each age class of kokanee as: 6.023 million age-0 (wild and hatchery fry), 883,000 age-1, 409,000 age-2, 579,000 age-3, 861,000 age-4, and 87,000 age-5. Wild fry abundance was estimated at 2.57 million fish. These originated from 43.1 million eggs spawned in the wild during the fall of 1998. The survival from wild spawned eggs to wild fry was, therefore, 6.0%. This was lower than the 9.6% survival rate calculated last year but was much higher than the 1.4% calculated in 1995 prior to changing lake levels. To date, years of higher winter lake elevations have out-performed years of full drawdown. Based on data collected during trawl sampling, the total number of eggs laid in the lake in the fall of 1999 was 74.8 million. Mean fecundity per female was 379 eggs. Hatchery personnel collected 22.4 million eggs, leaving 52.4 million eggs to be laid by wild fish in tributary streams and along the lake shoreline. These eggs will be used to assess wild kokanee survival during 2000. Peak counts of spawning kokanee were 3,500 fish on the shoreline and 16,400 fish in tributary streams. This represents only a fraction of the total kokanee spawning population. Opossum shrimp Mysis relicta increased slightly in the southern two sections of the lake but decreased in the northern end. Immature and mature shrimp (excluding young-of-the-year shrimp) densities averaged 302 shrimp/m{sup 2}, down from 426 shrimp/m{sup 2} the previous year. The relatively stable shrimp population was not thought to affect the outcome of the lake level testing.

  5. 78 FR 54547 - Fisheries Off West Coast States; Highly Migratory Fisheries; California Drift Gillnet Fishery...

    Science.gov (United States)

    2013-09-04

    ...; Issuance of Permit; Fisheries Off West Coast States; Highly Migratory Fisheries; California Drift Gillnet Fishery; Sperm Whale Interaction Restriction; Final Rule and Notice #0;#0;Federal Register / Vol. 78 , No... Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-BD57 Fisheries Off West Coast...

  6. 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),...

  7. Assessing the ecosystem-level consequences of a small-scale artisanal kelp fishery within the context of climate-change.

    Science.gov (United States)

    Krumhansl, Kira A; Bergman, Jordanna N; Salomon, Anne K

    2016-12-16

    Coastal communities worldwide rely on small-scale artisanal fisheries as a means of increasing food security and alleviating poverty. Even small-scale fishing activities, however, are prone to resource depletion and environmental degradation, which can erode livelihoods in the long run. Thus, there is a pressing need to identify viable and resilient artisanal fisheries, and generate knowledge to support management within the context of a rapidly changing climate. We examined the ecosystem-level consequences of an artisanal kelp fishery (Macrocystis pyrifera), finding small-scale harvest of this highly productive species poses minimal impacts on kelp recovery rates, survival, and biomass dynamics, and abundances of associated commercial and culturally important fish species. These results suggest that small-scale harvest poses minimal trade-offs for the other economic benefits provided by these ecosystems, and their inherent, spiritual, and cultural value to humans. However, we detected a negative impact of warmer seawater temperatures on kelp recovery rates following harvest, indicating that the viability of harvest, even at small scales, may be threatened by future increases in global ocean temperature. This suggests that negative impacts of artisanal fisheries may be more likely to arise in the context of a warming climate, further highlighting the widespread effects of global climate change on coastal fisheries and livelihoods.

  8. Strobe Light Testing and Kokanee Population Monitoring : Dworshak Dam Impacts Assessment and Fisheries Investigation Project, 97-99 : annual Progress Report for 1998.

    Energy Technology Data Exchange (ETDEWEB)

    Maiolie, Melo A.; Harryman, Bill; Ament, William J.

    1999-12-01

    We tested the response of kokanee Oncorhynchus nerka to strobe lights. Testing was conducted on wild, free-ranging fish in their natural environment (i.e., the pelagic region of two large Idaho lakes). Split-beam hydroacoustics were used to record the distance kokanee moved away from the lights as well as the density of kokanee in the area near the lights. In control tests, where the strobe lights were lowered into the lake but kept turned off, kokanee remained within a few meters of the lights. Once the lights began flashing, kokanee quickly moved away from the light source. Kokanee were found to move an average of 30 to 136 m away from the lights in waters with Secchi transparencies from 2.8 to 17.5 m (p=0.00 to p=0.04). Kokanee densities near the lights were significantly lower (p=0.00 to p=0.07) when the lights were turned on than in control samples with no lights flashing. Flash rates of 300, 360, and 450 flashes/min elicited strong avoidance responses from the fish. Kokanee remained at least 24 m away from the lights during our longest test that lasted for 5 h 50 min. Kokanee appeared to be responding to flashes that were well less than 0.00016 lux above background lighting.

  9. Fisheries Reclamation Events

    Data.gov (United States)

    Minnesota Department of Natural Resources — This layer shows waterbodies that have been treated for fish removal(i.e., reclaimed)by DNR Fisheries. Some waterbodies have had multiple treatments. Attributes...

  10. Fishery Management Report

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report is intended to summarize much of the information which has been compiled over the years for the fishery management program on Moosehorn National Wildlife...

  11. International Fisheries Agreements

    DEFF Research Database (Denmark)

    Pintassilgo, Pedro; Kronbak, Lone Grønbæk; Lindroos, Marko

    2015-01-01

    This paper surveys the application of game theory to the economic analysis of international fisheries agreements. The relevance of this study comes not only from the existence of a vast literature on the topic but especially from the specific features of these agreements. The emphasis of the survey...... and stability of international fisheries agreements. A key message that emerges from this literature strand is that self-enforcing cooperative management of internationally shared fish stocks is generally difficult to achieve. Hence, the international legal framework and regulations play a decisive role...... is on coalition games, an approach that has become prominent in the fisheries economics literature over the last decade. It is shown that coalition games were first applied to international fisheries agreements in the late 1990s addressing cooperative issues under the framework of characteristic function games...

  12. Morocco - Artisanal Fisheries

    Data.gov (United States)

    Millennium Challenge Corporation — The final performance evaluation roadmap for the Small-Scale Fisheries Project (PPA-MCC) is developed using a grid constructed around indicators relating to Project...

  13. Supply regimes in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max

    2006-01-01

    Supply in fisheries is traditionally known for its backward bending nature, owing to externalities in production. Such a supply regime, however, exist only for pure open access fisheries. Since most fisheries worldwide are neither pure open access, nor optimally managed, rather between the extremes......-economic supply model with mesh sizes is developed. It is found that in the presence of realistic management schemes, the supply curves are close to vertical in the relevant range. Also, the supply curve under open access with mesh size limitations is almost vertical in the relevant range, owing to constant...... recruitment. The implications are that the effects on supply following from e.g. trade liberalisation and reductions of subsidies are small in several and probably most fisheries worldwide. Keywords: backward-bending supply, regulated open access, regulated restricted access, mesh size regulation, Beverton...

  14. Hydro-acoustic and tsunami waves generated by the 2012 Haida Gwaii earthquake: Modeling and in situ measurements

    Science.gov (United States)

    Abdolali, Ali; Cecioni, Claudia; Bellotti, Giorgio; Kirby, James T.

    2015-02-01

    Detection of low-frequency hydro-acoustic waves as precursor components of destructive tsunamis can enhance the promptness and the accuracy of Tsunami Early Warning Systems (TEWS). We reconstruct the hydro-acoustic wave field generated by the 2012 Haida Gwaii tsunamigenic earthquake using a 2-D horizontal numerical model based on the integration over the depth of the compressible fluid wave equation and considering a mild sloped rigid seabed. Spectral analysis of the wave field obtained at different water depths and distances from the source revealed the frequency range of low-frequency elastic oscillations of sea water. The resulting 2-D numerical model gave us the opportunity to study the hydro-acoustic wave propagation in a large-scale domain with available computers and to support the idea of deep-sea observatory and data interpretation. The model provides satisfactory results, compared with in situ measurements, in the reproduction of the long-gravitational waves. Differences between numerical results and field data are probably due to the lack of exact knowledge of sea bottom motion and to the rigid seabed approximation, indicating the need for further study of poro-elastic bottom effects.

  15. 75 FR 33733 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2010-06-15

    ... Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION... as part of the live bait fishery or incidental to other fisheries; the incidental harvest of...

  16. 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.

  17. Appoach to realizing weak hydroacoustic beaconing signal based on DSP%一种基于DSP的声信标弱信号提取方法

    Institute of Scientific and Technical Information of China (English)

    李笑媛; 程晶; 那健

    2014-01-01

    介绍一种基于DSP处理模块实现声信标弱信号提取的方法。针对声信标的性能参数及其具体应用环境,采用一种在加性白噪声环境下能够使信号的输出信噪比达到最大的匹配滤波方法,并将其在DSP处理模块上实现,最终将检测结果以音频和视频的形式输出。经过实际应用测试,该方法易于实现,实时性好,在复杂的海洋背景噪声下可以较好提高声信标的作用距离。%This paper introduces a method to realize weak hydroacoustic beaconing signal detecting base on DSP. According to the capability parameters of the hydroacoustic beaconing that the subject have adopted and the application of the hydroacoustic beaconing to the specific environment, also because the matching filter is the best filter means in the condition of additive white noise, it can make the SNR of the output signal to maximize, so this paper adopted the matching filter method, and at last the subject realized weak hydroacoustic beaconing signal detecting on DSP module. After real testing, the system which is good for weak hydroacoustic beaconing signal detecting can run real-time and realize easily. After sea trials, the system using the method can quickly find the target when hydroacoustic beaconing in a long distance. The sea trials shows the method can improve detection distance and easy to use in the areas of the weak hydroacoustic beaconing signal detecting.

  18. Hydroacoustic quantification of free-gas venting offshore Svalbard, Arctic: Changes in space and time

    Science.gov (United States)

    Greinert, J.; Veloso, M.; De Batist, M. A.; Mienert, J.

    2013-12-01

    Hydroacoustic data from a seep site area offshore Spitsbergen have been collected since 2009 by RV Helmer Hanssen (U. Tromsoe) in order to monitor the dynamics of gas bubble seepage and evaluate the amount of CH4 released at the seafloor. A large number of acoustic flares have been detected during four years of data acquisition at an intensely seeping area close to the shelf edge in 240m water depth and further down-slope between 330 and 450m water depth covering the top of the gas hydrate stability zone. Water column data were collected with an EK60 split-beam echosounder system. Seep positions were determined by accounting for motion and using split-beam information to determine the ';flare spine' for seep location as accurately as possible. The inverse hydroacoustic method for flux estimation developed by Muyakshin et al. (2010) has been adapted to be used with the angle information derived from split-beam data and using gridding algorithms for generating acoustic maps for each of the four surveys. The method evaluates the flux using the backscattering volume strength (SV) above the seafloor produced by free gas release, a bubble size distribution (BSD) function obtained from video footage and models for bubble rising speed (BRS) taken from the literature. Methane flux calculations depending on these input parameters vary from 187 T/yr to 250 T/yr assuming a continuous discharge for the 240m deep shelf-edge site, when all data sets are merged. Compared to other fluxes e.g. from specific seep areas in the Black Sea (683 T/yr Greinert et al., 2010 JGR; 1376 T/yr Römer et al., 2012 MarGeo) or the Håkon Mosby mud volcano (181 T/yr Sauter et al., 2006 EPSL) the fluxes from offshore Svalbard are similar in range but on the lower end. However, studying the ';common area' which was insonified during all four years reveals a decreasing flux of about 20% although the actual seep positions have been very persistent. The reason for this is currently unknown. The

  19. Re-establishment of the IMS Hydroacoustic Station HA03, Robinson Crusoe Island, Chile

    Science.gov (United States)

    Haralabus, Georgios; Stanley, Jerry; Zampolli, Mario; Pautet, Lucie

    2015-04-01

    Water column hydrophone stations of the Comprehensive Nuclear-Test-Ban Treaty Organisation (CTBTO) International Monitoring System (IMS) comprise typically two triplets of moored hydrophones deployed on both sides of an island. Triplet distances vary approximately between 50 - 200 km from the island, with each triplet connected to the receiving shore equipment by fibre-optic submarine data cables. Once deployed, the systems relay underwater acoustic waveforms in the band 1 - 100 Hz in real time to Vienna via a shore based satellite link. The design life of hydroacoustic (HA) stations is at least 20 years, without need for any maintenance of the underwater system (UWS). The re-establishment of hydrophone station HA03 at Robinson Crusoe Island (670 km West of the Chilean mainland) is presented here. The station was destroyed in February 2010 by a Tsunami induced by an 8.8 magnitude earthquake. After a major engineering and logistical undertaking HA03 is now back in operation since April 2014. The main phases of the project are presented: (i) the installation of a shore facility for the reception of the hydrophone data from the UWS, which also relays the data back to the CTBTO International Data Center (IDC) in Vienna via a real-time satellite connection, (ii) the manufacturing and testing of the system to meet the stringent requirements of the Nuclear-Test-Ban Treaty, and (iii) the installation of the UWS with a state-of-the-art cable ship. Examples of data acquired by HA03 are also presented. These include hydroacoustic signals from the 1 April 2014 magnitude 8.2 earthquake in Northern Chile, bursting underwater bubbles from a submarine volcano near the Mariana Islands (15,000 Km away from the station), and vocalizations from the numerous marine mammals which transit in the vicinity of HA03. The use of CTBTO data for scientific purposes is possible via the virtual Data Exploitation Centre (vDEC), which is a platform that enables registered researchers to access

  20. Hydroacoustics for the discovery and quantification of Nassau grouper ( Epinephelus striatus) spawning aggregations

    Science.gov (United States)

    Egerton, J. P.; Johnson, A. F.; Le Vay, L.; McCoy, C. M.; Semmens, B. X.; Heppell, S. A.; Turner, J. R.

    2017-06-01

    Fish spawning aggregations (FSAs) are vital life-history events that need to be monitored to determine the health of aggregating populations; this is especially true of the endangered Nassau grouper ( Epinephelus striatus). Hydroacoustics were used to locate Nassau grouper FSAs at sites on the west end of Little Cayman (LCW), and east ends of Grand Cayman (GCE) and Cayman Brac (CBE). Fish abundance and biomass at each FSA were estimated via echo integration and FSA extent. Acoustic mean fish abundance estimates (±SE) on the FSA at LCW (893 ± 459) did not differ significantly from concurrent SCUBA estimates (1150 ± 75). Mean fish densities (number 1000 m-3) were significantly higher at LCW (33.13 ± 5.62) than at the other sites (GCE: 7.01 ± 2.1, CBE: 4.61 ± 1.16). We investigate different acoustic post-processing options to obtain target strength (TS), and we examine the different TS to total length (TL) formulas available. The SCUBA surveys also provided measures of TL through the use of laser callipers allowing development of an in situ TS to TL formula for Nassau grouper at the LCW FSA. Application of this formula revealed mean fish TL was significantly higher at LCW (65.4 ± 0.7 cm) than GCE (60.7 ± 0.4 cm), but not CBE (61.1 ± 2.5 cm). Use of the empirical TS to TL formula resulted in underestimation of fish length in comparison with diver measurements, highlighting the benefits of secondary length data and deriving specific TS to TL formulas for each population. FSA location examined with reference to seasonal marine protected areas (Designated Grouper Spawning Areas) showed FSAs were partially outside these areas at GCE and very close to the boundary at CBE. As FSAs often occur at the limits of safe diving operations, hydroacoustic technology provides an alternative method to monitor and inform future management of aggregating fish species.

  1. An adaptable toolkit to assess commercial fishery costs and benefits related to marine protected area network design [version 2; referees: 2 approved

    Directory of Open Access Journals (Sweden)

    Rémi M. Daigle

    2017-02-01

    Full Text Available Around the world, governments are establishing Marine Protected Area (MPA networks to meet their commitments to the United Nations Convention on Biological Diversity. MPAs are often used in an effort to conserve biodiversity and manage fisheries stocks. However, their efficacy and effect on fisheries yields remain unclear. We conducted a case-study on the economic impact of different MPA network design strategies on the Atlantic cod (Gadus morhua fisheries in Canada. The open-source R package that we developed to analyze this case study can be customized to conduct similar analyses for other systems. We used a spatially-explicit individual-based model of population growth and dispersal coupled with a fisheries management and harvesting component. We found that MPA networks that both protect the target species’ habitat and were spatially optimized to improve population connectivity had the highest net present value (i.e., were most profitable for the fishing industry. These higher profits were achieved primarily by reducing the distance travelled for fishing and reducing the probability of a moratorium event. These findings add to a growing body of knowledge demonstrating the importance of incorporating population connectivity in the MPA planning process, as well as the ability of this R package to explore ecological and economic consequences of alternative MPA network designs.

  2. Marine fisheries in Tanzania.

    Science.gov (United States)

    Jiddawi, Narriman S; Ohman, Marcus C

    2002-12-01

    Fishery resources are a vital source of food and make valuable economic contributions to the local communities involved in fishery activities along the 850 km stretch of the Tanzania coastline and numerous islands. Small-scale artisanal fishery accounts for the majority of fish catch produced by more than 43 000 fishermen in the country, mainly operating in shallow waters within the continental shelf, using traditional fishing vessels including small boats, dhows, canoes, outrigger canoes and dinghys. Various fishing techniques are applied using uncomplicated passive fishing gears such as basket traps, fence traps, nets as well as different hook and line techniques. Species composition and size of the fish varies with gear type and location. More than 500 species of fish are utilized for food with reef fishes being the most important category including emperors, snappers, sweetlips, parrotfish, surgeonfish, rabbitfish, groupers and goatfish. Most of the fish products are used for subsistence purposes. However, some are exported. Destructive fishing methods such as drag nets and dynamite fishing pose a serious problem as they destroy important habitats for fish and other organisms, and there is a long-term trend of overharvested fishery resources. However, fishing pressure varies within the country as fishery resources are utilized in a sustainable manner in some areas. For this report more than 340 references about Tanzanian fishery and fish ecology were covered. There are many gaps in terms of information needed for successful fishery management regarding both basic and applied research. Most research results have been presented as grey literature (57%) with limited distribution; only one-fifth were scientific publications in international journals.

  3. Strobe Light Testing and Kokanee Population Monitoring : Dworshak Dam Impacts Assessment and Fisheries Investigation Project, 87-99 : Annual Progress Report.

    Energy Technology Data Exchange (ETDEWEB)

    Maiolie, Melo A.; Harryman, Bill; Ament, Willaim J.

    1999-11-01

    We tested the response of kokanee Oncorhynchus nerka to strobe lights. Testing was conducted on wild, free-ranging fish in their natural environment (i.e., the pelagic region of two large Idaho lakes). Split-beam hydroacoustics were used to record the distance kokanee moved away from the lights, as well as the density of kokanee in the area near the lights. In control tests, where strobe lights were lowered into the lake but kept turned off, kokanee remained within a few meters of the lights. Once the lights began flashing, kokanee quickly moved away from the light source. Kokanee moved 20 to 40 m away from the lights in waters with Secchi transparencies from 3 to 5 m. Kokanee densities near the lights were significantly lower (p=0.07 to p=0.00) when the lights were turned on than in control samples with no lights flashing. Flash rates of 300, 360, and 450 flashes/min elicited strong avoidance responses from the fish. Kokanee remained at least 24 m from the lights during our longest test that lasted for 5 h 50 min. We also continued annual monitoring of the kokanee population in Dworshak Reservoir. Spawner counts in four tributary streams that were used as an index of the adult population reached a record low of 144 spawners. No age-1 or age-2 kokanee were caught in 15 trawl hauls used to make population estimates. The population estimate of fry was 65,000 fish, {+-} 76% (90% C.I.). Flooding during the spring of 1996 was responsible for the low kokanee population.

  4. Fishery potential of the Gulf of Kachchh

    Digital Repository Service at National Institute of Oceanography (India)

    Nair, V.R.; Govindan, K.; Ramaiah, Neelam; Gajbhiye, S.N.

    Fishery potential of the interior Gulf of Kachchh and adjacent creek regions was reported for the first time as baseline data for future ecological assessment. The experimental trawling and gill netting indicated that the inner Gulf (av. 7.8 kg...

  5. 50 CFR 300.106 - Exploratory fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Exploratory fisheries. 300.106 Section 300.106 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Antarctic Marine Living Resources § 300.106 Exploratory fisheries. (a) An exploratory fishery,...

  6. Sensitivity of fish density estimates to standard analytical procedures applied to Great Lakes hydroacoustic data

    Science.gov (United States)

    Kocovsky, Patrick M.; Rudstam, Lars G.; Yule, Daniel L.; Warner, David M.; Schaner, Ted; Pientka, Bernie; Deller, John W.; Waterfield, Holly A.; Witzel, Larry D.; Sullivan, Patrick J.

    2013-01-01

    Standardized methods of data collection and analysis ensure quality and facilitate comparisons among systems. We evaluated the importance of three recommendations from the Standard Operating Procedure for hydroacoustics in the Laurentian Great Lakes (GLSOP) on density estimates of target species: noise subtraction; setting volume backscattering strength (Sv) thresholds from user-defined minimum target strength (TS) of interest (TS-based Sv threshold); and calculations of an index for multiple targets (Nv index) to identify and remove biased TS values. Eliminating noise had the predictable effect of decreasing density estimates in most lakes. Using the TS-based Sv threshold decreased fish densities in the middle and lower layers in the deepest lakes with abundant invertebrates (e.g., Mysis diluviana). Correcting for biased in situ TS increased measured density up to 86% in the shallower lakes, which had the highest fish densities. The current recommendations by the GLSOP significantly influence acoustic density estimates, but the degree of importance is lake dependent. Applying GLSOP recommendations, whether in the Laurentian Great Lakes or elsewhere, will improve our ability to compare results among lakes. We recommend further development of standards, including minimum TS and analytical cell size, for reducing the effect of biased in situ TS on density estimates.

  7. Hydroacoustic estimation of fish biomass in the Gulf of Nicoya, Costa Rica.

    Science.gov (United States)

    Hedgepeth, J; Gallucci, V F; Campos, J; Mug, M

    2000-01-01

    A stratified sampling design was used for a hydroacoustic survey of the inner parts of the Gulf of Nicoya in 1987 and 1988. The bottom topography of the inner Gulf was modeled by introducing the concept of a topographical basin model, as the basis for the projection of the sample survey estimates to the entire inner gulf. The bottom depth contours and volumes for the basin model were constructed from nautical charts. The estimates of sample abundance were made for the fish in the inner Gulf using the acoustic methods, EMS (Expectation Maximization and Smoothing) and echo integration. The estimates of population were made by the multiplication of the topographic model's estimate of water volume and a model of fish density dependent on bottom depth. The results showed a general decrease in fish density biomass with bottom depth, and a simultaneous tendency for maximum concentrations over bottom depths of about four meters. The four meter bottom depth includes a broad expanse of the inner Gulf located south of Isla Chira. Overall estimates of volumetric density (0.269 fish/m3) and of areal densities (1.88 fish/m2) are comparable to other estuarine shallow water environments.

  8. USVI commercial fisheries cost data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — To assist the Caribbean Fishery Management Council in managing marine living resources in the United States Virgin Islands, the Southeast Fisheries Science Center...

  9. African Journals Online: Fish & Fisheries

    African Journals Online (AJOL)

    The African Journal of Marine Science provides an international forum for the ... The African Journal of Tropical Hydrobiology and Fisheries (Afr. J. Trop. ... promote the development of the fisheries profession and related disciplines in Nigeria, ...

  10. A case study on the impact of industrial effluent disposal on the fishery of Amba River Estuary, Maharashtra

    Digital Repository Service at National Institute of Oceanography (India)

    Gajbhiye, S.N.; Mehta, P.; Mustafa, S.; Nair, V.R.

    The impact of waste discharge on fishery resources is a matter of great concern. The accepted norm in all environmental impact assessment studies is to avoid areas of high fishery potential while locating a marine outfall. Contemplating...

  11. Fisheries and climate

    DEFF Research Database (Denmark)

    Brander, Keith

    2009-01-01

    Fish stocks and the fisheries based on them have always experienced variability due to climate. Changes in temperature, salinity, winds, ocean currents, oxygen, and other factors affect their distribution, growth, survival, and recruitment. Examples of such effects are given for several regions...... of the oceans and the processes are described. Poleward distribution shifts have occurred since the 1960s and can be attributed to the effects of anthropogenic climate change with a high degree of confidence. In addition to climate effects, fisheries are subjected to other anthropogenic stresses, including high...... fishing mortality, loss of habitat, pollution, and introduction of alien species. These interact and may reduce the resilience of exploited stocks, although climate change may also increase productivity in some cases. Fisheries production depends on primary production, but to date we have low confidence...

  12. Fisheries and climate

    DEFF Research Database (Denmark)

    Brander, Keith

    2009-01-01

    Fish stocks and the fisheries based on them have always experienced variability due to climate. Changes in temperature, salinity, winds, ocean currents, oxygen, and other factors affect their distribution, growth, survival, and recruitment. Examples of such effects are given for several regions...... of the oceans and the processes are described. Poleward distribution shifts have occurred since the 1960s and can be attributed to the effects of anthropogenic climate change with a high degree of confidence. In addition to climate effects, fisheries are subjected to other anthropogenic stresses, including high...... fishing mortality, loss of habitat, pollution, and introduction of alien species. These interact and may reduce the resilience of exploited stocks, although climate change may also increase productivity in some cases. Fisheries production depends on primary production, but to date we have low confidence...

  13. An Integrated Assessment Model for Helping the United States Sea Scallop (Placopecten magellanicus) Fishery Plan Ahead for Ocean Acidification and Warming

    OpenAIRE

    Sarah R Cooley; Rheuban, Jennie E.; Deborah R Hart; Victoria Luu; Glover, David M; Hare, Jonathan A.; Doney, Scott C.

    2015-01-01

    Ocean acidification, the progressive change in ocean chemistry caused by uptake of atmospheric CO2, is likely to affect some marine resources negatively, including shellfish. The Atlantic sea scallop (Placopecten magellanicus) supports one of the most economically important single-species commercial fisheries in the United States. Careful management appears to be the most powerful short-term factor affecting scallop populations, but in the coming decades scallops will be increasingly influenc...

  14. Assessment of Hydroacoustic Propagation Using Autonomous Hydrophones in the Scotia Sea

    Science.gov (United States)

    2010-09-01

    seismic stations deployed in an effort to monitor the global oceans for signs of explosive tests that may be conducted below or just above the sea surface...and South Orkney Islands; and the Antarctic Peninsula. It is a tectonic and volcanically active area, providing an abundance of sub-seafloor...Due to the surface reflected-refracted propagation style, the Scotia Volcanic Arc and the ridges that bound the Scotia Plate to the north and south

  15. A new source discriminant based on frequency dispersion for hydroacoustic phases recorded by T-phase stations

    Science.gov (United States)

    Talandier, Jacques; Okal, Emile A.

    2016-09-01

    In the context of the verification of the Comprehensive Nuclear-Test Ban Treaty in the marine environment, we present a new discriminant based on the empirical observation that hydroacoustic phases recorded at T-phase stations from explosive sources in the water column feature a systematic inverse dispersion, with lower frequencies traveling slower, which is absent from signals emanating from earthquake sources. This difference is present even in the case of the so-called `hotspot earthquakes' occurring inside volcanic edifices featuring steep slopes leading to efficient seismic-acoustic conversions, which can lead to misidentification of such events as explosions when using more classical duration-amplitude discriminants. We propose an algorithm for the compensation of the effect of dispersion over the hydroacoustic path based on a correction to the spectral phase of the ground velocity recorded by the T-phase station, computed individually from the dispersion observed on each record. We show that the application of a standard amplitude-duration algorithm to the resulting compensated time-series satisfactorily identifies records from hotspot earthquakes as generated by dislocation sources, and present a full algorithm, lending itself to automation, for the discrimination of explosive and earthquake sources of hydroacoustic signals at T-phase stations. The only sources not readily identifiable consist of a handful of complex explosions which occurred in the 1970s, believed to involve the testing of advanced weaponry, and which should be independently identifiable through routine vetting by analysts. While we presently cannot provide a theoretical justification to the observation that only explosive sources generate dispersed T phases, we hint that this probably reflects a simpler, and more coherent distribution of acoustic energy among the various modes constituting the wave train, than in the case of dislocation sources embedded in the solid Earth.

  16. Hambantota Fishery Harbour

    NARCIS (Netherlands)

    Everts, P.S.; Julianus, E.J.B.; Marijnissen, M.; Voorend, S.J.M.

    2014-01-01

    At the southern coast of Sri Lanka a small fishery harbour is located in Hambantota. Soon after construction of the harbour in 2006 the harbour started silting up at various places. From that point onwards the harbour’s basin has been dredged multiple times, but the problem turned out to be structur

  17. Hambantota Fishery Harbour

    NARCIS (Netherlands)

    Everts, P.S.; Julianus, E.J.B.; Marijnissen, M.; Voorend, S.J.M.

    2014-01-01

    At the southern coast of Sri Lanka a small fishery harbour is located in Hambantota. Soon after construction of the harbour in 2006 the harbour started silting up at various places. From that point onwards the harbour’s basin has been dredged multiple times, but the problem turned out to be

  18. STATE SUPPORT IN FISHERY

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2004-06-01

    Full Text Available By passing the law on state support in agriculture, fishery and forestry the former support system has been changed. Fishery support beneficiaries can use several kinds of support and help. Former financial stimulations for fishery regulated by law from 1995 to 1st January 2003 were settled by the production stimulation model. Besides that well received model, there are the capital investment model, the support in production insurance, the right to use blue diesel, and granting credit for production of freshwater and saltwater fry, adult fish and shells. These five models of support and help can be used by freshwater and saltwater fish and shell breeders, while for fishing the marine fish the production stimulation model is applied (fishing of small pelagic fish, as well as the capital investment model and right to use blue diesel. Marine and freshwater processors can use the production stimulation and the capital investment model. All these models have in common the fact that all physical and legal entities registered for fishing activities (having licence for commercial fishery, aquaculture (the licence for aquaculture or the one for fish and other marine organisam breeding and processing (having the regulated veterinarian and sanitary conditions, the registration document and having been registered in the List of approved facilities have the right to use them.

  19. Particle Filter Based Fault-tolerant ROV Navigation using Hydro-acoustic Position and Doppler Velocity Measurements

    DEFF Research Database (Denmark)

    Zhao, Bo; Blanke, Mogens; Skjetne, Roger

    2012-01-01

    This paper presents a fault tolerant navigation system for a remotely operated vehicle (ROV). The navigation system uses hydro-acoustic position reference (HPR) and Doppler velocity log (DVL) measurements to achieve an integrated navigation. The fault tolerant functionality is based on a modied...... particle lter. This particle lter is able to run in an asynchronous manner to accommodate the measurement drop out problem, and it overcomes the measurement outliers by switching observation models. Simulations with experimental data show that this fault tolerant navigation system can accurately estimate...

  20. Hydroacoustic Evaluation of Juvenile Salmonid Passage at The Dalles Dam Sluiceway, 2005

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Gary E.; Khan, Fenton; Hedgepeth, J; Mueller, Robert P.; Rakowski, Cynthia L.; Richmond, Marshall C.; Serkowski, John A.; Skalski, John R.

    2006-06-01

    The U.S. Army Corps of Engineers Portland District engaged the Pacific Northwest National Laboratory to evaluate fish passage at The Dalles Dam powerhouse in 2005. The goal of the study was to provide information on smolt passage that will inform decisions on long-term measures and operations to enhance sluiceway passage and reduce turbine passage to improve smolt survival at the dam. The study addressed one of the main programs dedicated to improving juvenile salmonid survival at The Dalles Dam: Surface Flow Bypass. The study objectives (see below) were met using a combination of hydroacoustic and hydraulic data. The study incorporated fixed-location hydroacoustic methods across the entire powerhouse, with especially intense sampling using multiple split-beam transducers at all sluiceway portals. We did not sample fish passage at the spillway in 2005. In the sluiceway nearfield, we used an acoustic camera to track fish movements. The fish data were interpreted with hydraulic data from a computational fluid dynamics (CFD) model. Fish passage data were collected in the framework of an “experiment” using a randomized block design (3-day treatments; two treatments) to compare two sluiceway operational configurations: Sluice 2+5 and Sluice 2+19 (six gates open for each configuration). Total project outflow was 76% of the 10-year average for spring and 71% of the 10-year average for summer. Based on these findings, we make the following recommendations: 1) The sluice should be operated 24 h/d from April until November. 2) Open six rather than three sluice gates to take advantage of the maximum hydraulic capacity of the sluiceway. 3) Open the three gates above the western-most operating main turbine unit and the three gates at MU 8 where turbine passage rates are relatively high. 4) Operate the turbine units below open sluice gates as a standard fish operations procedure. 5) Develop hydraulic and entrance enhancements to the sluiceway to tap the potential of The

  1. First hydroacoustic evidence of marine, active fluid vents in the Naples Bay continental shelf (Southern Italy)

    Science.gov (United States)

    Passaro, Salvatore; Genovese, Simona; Sacchi, Marco; Barra, Marco; Rumolo, Paola; Tamburrino, Stella; Mazzola, Salvatore; Basilone, Gualtiero; Placenti, Francesco; Aronica, Salvatore; Bonanno, Angelo

    2014-09-01

    We present the first results of a multidisciplinary research aimed at the detection and mapping of Active Fluid Vents (AFVs) at the seafloor of the Naples Bay, Italy. This segment of the Campania continental margin is characterised by severe Quaternary extension and intense volcanism at Ischia and Procida islands, the Campi Flegrei and Somma-Vesuvius volcanic complexes. High resolution hydroacoustic profilers were used to identify and localize fluid emission from the seafloor. ROV direct observation showed that each emission centre is generally composed by the coalescence of several emitting points. CTD probes showed that there are no significant gradients in temperature profiles. The results of this study include the detection and mapping of 54 fluid emission points all located in the - 71/- 158 m depth range, and spatially distributed into four main clusters. Three of the described clusters are located along the margin of a complex, toe-shaped seafloor morphology southwest of the Somma-Vesuvius, representing the shallow expression of partly buried, coalesced depositional features (namely, two flank collapses and one pyroclastic flow) associated with the Late Pleistocene activity of the volcano. The fourth AFV cluster was detected at the morphological - high, located about 8 km south of Naples (Banco della Montagna), represented by a field of volcaniclastic diapirs composed of massive pumiceous deposits originated from the Campi Flegrei intruding rising through the latest Quaternary-Holocene marine deposits. Our study suggests that the occurrence of AFV in this area could be genetically linked to the interaction between volcanic related seafloor morphologies and the main, NE striking faults present in the area, i.e. the Magnaghi-Sebeto line and the Vesuvian fault.

  2. Measuring real-time streamflow using emerging technologies: Radar, hydroacoustics, and the probability concept

    Science.gov (United States)

    Fulton, J.; Ostrowski, J.

    2008-01-01

    Forecasting streamflow during extreme hydrologic events such as floods can be problematic. This is particularly true when flow is unsteady, and river forecasts rely on models that require uniform-flow rating curves to route water from one forecast point to another. As a result, alternative methods for measuring streamflow are needed to properly route flood waves and account for inertial and pressure forces in natural channels dominated by nonuniform-flow conditions such as mild water surface slopes, backwater, tributary inflows, and reservoir operations. The objective of the demonstration was to use emerging technologies to measure instantaneous streamflow in open channels at two existing US Geological Survey streamflow-gaging stations in Pennsylvania. Surface-water and instream-point velocities were measured using hand-held radar and hydroacoustics. Streamflow was computed using the probability concept, which requires velocity data from a single vertical containing the maximum instream velocity. The percent difference in streamflow at the Susquehanna River at Bloomsburg, PA ranged from 0% to 8% with an average difference of 4% and standard deviation of 8.81 m3/s. The percent difference in streamflow at Chartiers Creek at Carnegie, PA ranged from 0% to 11% with an average difference of 5% and standard deviation of 0.28 m3/s. New generation equipment is being tested and developed to advance the use of radar-derived surface-water velocity and instantaneous streamflow to facilitate the collection and transmission of real-time streamflow that can be used to parameterize hydraulic routing models.

  3. Sparse targets in hydroacoustic surveys: Balancing quantity and quality of in situ target strength data

    Science.gov (United States)

    DuFour, Mark R.; Mayer, Christine M.; Kocovsky, Patrick; Qian, Song; Warner, David M.; Kraus, Richard T.; Vandergoot, Christopher

    2017-01-01

    Hydroacoustic sampling of low-density fish in shallow water can lead to low sample sizes of naturally variable target strength (TS) estimates, resulting in both sparse and variable data. Increasing maximum beam compensation (BC) beyond conventional values (i.e., 3 dB beam width) can recover more targets during data analysis; however, data quality decreases near the acoustic beam edges. We identified the optimal balance between data quantity and quality with increasing BC using a standard sphere calibration, and we quantified the effect of BC on fish track variability, size structure, and density estimates of Lake Erie walleye (Sander vitreus). Standard sphere mean TS estimates were consistent with theoretical values (−39.6 dB) up to 18-dB BC, while estimates decreased at greater BC values. Natural sources (i.e., residual and mean TS) dominated total fish track variation, while contributions from measurement related error (i.e., number of single echo detections (SEDs) and BC) were proportionally low. Increasing BC led to more fish encounters and SEDs per fish, while stability in size structure and density were observed at intermediate values (e.g., 18 dB). Detection of medium to large fish (i.e., age-2+ walleye) benefited most from increasing BC, as proportional changes in size structure and density were greatest in these size categories. Therefore, when TS data are sparse and variable, increasing BC to an optimal value (here 18 dB) will maximize the TS data quantity while limiting lower-quality data near the beam edges.

  4. Job Satisfaction in Fisheries Compared.

    Science.gov (United States)

    Pollnac, Richard; Bavinck, Maarten; Monnereau, Iris

    2012-10-01

    This article draws comparative lessons from seven job satisfaction studies on marine capture fishing that were recently carried out in nine countries and three geographical regions-Asia, Africa, and the Caribbean. The seven studies made use of an identical job satisfaction assessment tool and present information on a selection of métiers mainly in the small-scale and semi-industrial fishing sectors. The responses manifest statistically significant geographical variation. Multidimensional plots and cluster analyses lead the authors to identify three clusters: (1) Southeast Asian (Vietnam and Thailand); (2) Caribbean (Belize, Nicaragua, Dominican Republic) and (3) Afro-Indian (Senegal, Guinea Bissau, and India). Jamaica is a significant outlier. On a general level, the authors conclude that fishers who report that they are not interested in leaving the occupation of fishing score higher on three traditional job satisfaction scales-basic needs, social needs and self actualization. Those who say they would leave fishing for another occupation are younger, have less fishing experience and smaller households. The latter findings are of relevance with regard to the pressing need, felt by fisheries managers, to move fishers out of the fishery.

  5. 75 FR 34092 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery

    Science.gov (United States)

    2010-06-16

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-AY41 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery AGENCY: National Marine Fisheries Service (NMFS.... Such action is authorized under the Atlantic Coastal Fisheries Cooperative Management Act...

  6. 78 FR 45896 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure...

    Science.gov (United States)

    2013-07-30

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC782 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration...

  7. 76 FR 39313 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2011-07-06

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA523 Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the Directed Butterfish Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and...

  8. 78 FR 51131 - Fisheries of the Northeastern United States; Atlantic Coastal Fisheries Cooperative Management...

    Science.gov (United States)

    2013-08-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-BD45 Fisheries of the Northeastern United States; Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration...

  9. 78 FR 76759 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure...

    Science.gov (United States)

    2013-12-19

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XD024 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration...

  10. 77 FR 58969 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2012-09-25

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC235 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS..., 2012. FOR FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist,...

  11. 76 FR 74009 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2011-11-30

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA825 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS...: Carly Bari, Fishery Management Specialist, (978) 281-9224. SUPPLEMENTARY INFORMATION:...

  12. 78 FR 64199 - Fisheries of the South Atlantic; South Atlantic Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-10-28

    .... SUMMARY: The South Atlantic Fishery Management Council's (Council) Scientific and Statistical Committee... Atlantic Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries Service (NMFS...: (800) 445-8667 or (843) 308- 9330. Council address: South Atlantic Fishery Management Council,...

  13. 78 FR 48653 - Fisheries of the South Atlantic; South Atlantic Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-08-09

    ... Fishery Management Council (SAFMC) Scientific and Statistical Committee (SSC). SUMMARY: The SAFMC will... Atlantic Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries Service (NMFS...: South Atlantic Fishery Management Council, 4055 Faber Place Drive, Suite 201, N. Charleston, SC...

  14. 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...

  15. Fisheries-Independent Biological and Environmental Trawl Data from the Louisiana Department of Wildlife and Fisheries (1986-2007) as Part of the Comparative Assessment of Gulf Estuarine Systems (CAGES) Database (NODC Accession 0115183)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The CAGES program (Comparative Assessment of Gulf Estuarine Systems) is designed to examine the differences between estuarine ecosystems and investigate why some...

  16. 50 CFR 259.32 - Conditional fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Conditional fisheries. 259.32 Section 259.32 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE AID TO FISHERIES CAPITAL CONSTRUCTION FUND Capital Construction...

  17. 50 CFR 600.110 - Intercouncil fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Intercouncil fisheries. 600.110 Section 600.110 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MAGNUSON-STEVENS ACT PROVISIONS Regional Fishery Management Councils §...

  18. DEMON-type algorithms for determination of hydro-acoustic signatures of surface ships and of divers

    Science.gov (United States)

    Slamnoiu, G.; Radu, O.; Rosca, V.; Pascu, C.; Damian, R.; Surdu, G.; Curca, E.; Radulescu, A.

    2016-08-01

    With the project “System for detection, localization, tracking and identification of risk factors for strategic importance in littoral areas”, developed in the National Programme II, the members of the research consortium intend to develop a functional model for a hydroacoustic passive subsystem for determination of acoustic signatures of targets such as fast boats and autonomous divers. This paper presents some of the results obtained in the area of hydroacoustic signal processing by using DEMON-type algorithms (Detection of Envelope Modulation On Noise). For evaluation of the performance of various algorithm variations we have used both audio recordings of the underwater noise generated by ships and divers in real situations and also simulated noises. We have analysed the results of processing these signals using four DEMON algorithm structures as presented in the reference literature and a fifth DEMON algorithm structure proposed by the authors of this paper. The algorithm proposed by the authors generates similar results to those obtained by applying the traditional algorithms but requires less computing resources than those and at the same time it has proven to be more resilient to random noise influence.

  19. Overview of hydro-acoustic current-measurement applications by the U.S. geological survey in Indiana

    Science.gov (United States)

    Morlock, Scott E.; Stewart, James A.

    1999-01-01

    The U.S. Geological Survey (USGS) maintains a network of 170 streamflow-gaging stations in Indiana to collect data from which continuous records of river discharges are produced. Traditionally, the discharge record from a station is produced by recording river stage and making periodic discharge measurements through a range of stage, then developing a relation between stage and discharge. Techniques that promise to increase data collection accuracy and efficiency include the use of hydro-acoustic instrumentation to measure river velocities. The velocity measurements are used to compute river discharge. In-situ applications of hydro-acoustic instruments by the USGS in Indiana include acoustic velocity meters (AVM's) at six streamflow-gaging stations and newly developed Doppler velocity meters (DVM's) at two stations. AVM's use reciprocal travel times of acoustic signals to measure average water velocities along acoustic paths, whereas DVM's use the Doppler shift of backscattered acoustic signals to compute water velocities. In addition to the in-situ applications, three acoustic Doppler current profilers (ADCP's) are used to make river-discharge measurements from moving boats at streamflow-gaging stations in Indiana. The USGS has designed and is testing an innovative unmanned platform from which to make ADCP discharge measurements.

  20. Mechanical behavior analysis of a submerged fixed point anchoring system for a hydroacoustic signature measuring sensor for divers and ships

    Science.gov (United States)

    Slamnoiu, G.; Radu, O.; Surdu, G.; Roşca, V.; Damian, R.; Pascu, C.; Curcă, E.; Rădulescu, A.

    2016-08-01

    The paper has as its main objectives the presentation and the analysis of the numerical analysis results for the study of a fixed point anchoring system for a hydroacoustic sensor when measuring the hydroacoustic signature of divers and ships in real sea conditions. The study of the mechanical behavior of this system has as main objectives the optimization of the shape and weight of the anchorage ballast for the metallic structure while considering the necessity to maintain the sensor in a fixed point and the analysis of the sensor movements and the influences on the measurements caused by the sea current streams. The study was focused on the 3D model of metallic structure design; numerical modeling of the water flow around the sensor anchoring structure using volume of fluid analysis and the analysis of the forces and displacements using FEM when needed for the study. In this paper we have used data for the sea motion dynamics and in particular the velocity of the sea current streams as determined by experimental measurements that have been conducted for the western area of the Black Sea.

  1. The common fisheries policy of the European Union and fisheries economics

    DEFF Research Database (Denmark)

    Frost, Hans; Andersen, Peder

    2006-01-01

    with the ‘conventional’ bioeconomic theory. The purpose is to assess to what extent the lessons of the theory could be found in the Roadmap. Having in mind the complexity of the EU fisheries, the Roadmap, in particular, focuses on fleet management policy with the aim of reducing overcapacity on a community level...

  2. Green growth in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max; Ravensbeck, Lars; Nielsen, Rasmus

    2014-01-01

    Climate change and economic growth have gained a substantial amount of attention over the last decade. Hence, in order to unite the two fields of interest, the concept of green growth has evolved. The concept of green growth focuses on how to achieve growth in environment-dependent sectors, without...... harming the environment. Fishery is an environment-dependent sector and it has been argued that there is no potential for green growth in the sector owing to global overexploitation, leaving no scope for production growth. The purpose of this paper is to explain what green growth is and to develop...... a conceptual framework. Furthermore, the aim is to show that a large green growth potential actually exists in fisheries and to show how this potential can be achieved. The potential green growth appears as value-added instead of production growth. The potential can be achieved by reducing overcapacity...

  3. Economic effort management in multispecies fisheries: the FcubEcon model

    DEFF Research Database (Denmark)

    Hoff, Ayoe; Frost, Hans; Ulrich, Clara

    2010-01-01

    Applying single-species assessment and quotas in multispecies fisheries can lead to overfishing or quota underutilization, because advice can be conflicting when different stocks are caught within the same fishery. During the past decade, increased focus on this issue has resulted in the developm......Applying single-species assessment and quotas in multispecies fisheries can lead to overfishing or quota underutilization, because advice can be conflicting when different stocks are caught within the same fishery. During the past decade, increased focus on this issue has resulted...... optimal manner, in both effort-management and single-quota management settings.Applying single-species assessment and quotas in multispecies fisheries can lead to overfishing or quota underutilization, because advice can be conflicting when different stocks are caught within the same fishery. During...

  4. Synthesis of algorithms of optimization and quasioptimization of space-time noise signal processing to the correlated noise in conditions of complicated motion of aviation hydroacoustic station antenna

    Directory of Open Access Journals (Sweden)

    И. В. Чекед

    1999-09-01

    Full Text Available On the basis of earlier developed approaches to optimization of space-time processing with complicated motion of aviation hydroacoustic station antenna in space the series of space-time signal processing algorithms on a background of Gaussian correlated noise were synthesized. The signal consisted of discrete components and a continuous part of a spectrum was considered

  5. Artisanal Fishers' Use of Sustainable Fisheries Management ...

    African Journals Online (AJOL)

    Artisanal Fishers' Use of Sustainable Fisheries Management Practices in the Jebba Lake ... as key stakeholders in fisheries policy formulation, implementation and evaluation. ... Keywords: Fisheries, Policy, Environment and Management ...

  6. Fisheries management: what chance on coral reefs?

    OpenAIRE

    1996-01-01

    Failures of fishery management to control fishing effort globally and how this affects the coral reef fisheries are discussed. The use of marine reserves in coral reef fisheries management is also emphasized.

  7. Yakima Fisheries Project : Final Environmental Impact Statement.

    Energy Technology Data Exchange (ETDEWEB)

    United States. Bonneville Power Administration; Washington (State). Dept. of Fish and Wildlife; Confederated Tribes and Bands of the Yakama Nation, Washington.

    1996-01-01

    BPA proposes to fund several fishery-related activities in the Yakima River Basin. These activities, known as the Yakima Fisheries Project (YFP), would be jointly managed by the State of Washington and the Yakima Indian Nation. The YFP is included in the Northwest Power Planning Council`s (Council`s) fish and wildlife program. The Council selected the Yakima River system for attention because fisheries resources are severely reduced from historical levels and because there is a significant potential for enhancement of these resources. BPA`s proposed action is to fund (1) information gathering on the implementation of supplementation techniques and on feasibility of reintroducing coho salmon in an environment where native populations have become extinct; (2) research activities based on continuous assessment, feedback and improvement of research design and activities ({open_quotes}adaptive management{close_quotes}); and (3) die construction, operation, and maintenance of facilities for supplementing populations of upper Yakima spring chinook salmon. Examined in addition to No Action are two alternatives for action: (1) supplementation of depressed natural populations of upper Yakima spring chinook and (2) that same supplementation plus a study to determine the feasibility of reestablishing naturally spawning population and a significant fall fishery for coho in the Yakima Basin. Alternative 2 is the preferred action. A central hatchery would be built for either alternative, as well as three sites with six raceways each for acclimation and release of spring chinook smolts. Major issues examined in the Revised Draft EIS include potential impacts of the project on genetic and ecological resources of existing fish populations, on water quality and quantity, on threatened and endangered species listed under the Endangered Species Act, and on the recreational fishery.

  8. Spatio-temporal declines in Philippine fisheries and its implications to coastal municipal fishers’ catch and income

    Directory of Open Access Journals (Sweden)

    Jonathan A Anticamara

    2016-03-01

    Full Text Available The problem of overexploitation in global fisheries is well-recognized. However, published assessment of fisheries spatio-temporal trends at the national scale is lacking for many high biodiversity developing countries, which is problematic since fisheries management is often implemented at the local or national levels. Here, we present the long-term spatio-temporal trends of Philippine fisheries production based on the landed national fish catch data (1980-2012 and fishers’ interviews. We found that the total Philippine fish catch volume (Metric Tons MT of most capture fisheries throughout the country has either stagnated or declined over the last three decades. The decline is even more prominent when evaluating fisheries trends at the provincial level, suggesting spatial serial depletion of the country’s fisheries. In contrast, the total Philippine fish catch value (US Dollars US$ or Philippine Pesos PHP has continued to increase over time, despite the declining fish catch volume. However, local municipal fishers are experiencing both low fish catch and income, contributing to observable poverty in many coastal communities in the Philippines. The various stakeholders of Philippine fisheries need to recognize the depleted state of Philippine fisheries, and learn from various experiences of collapsed and recovered fisheries from around the world, in order to recover the Philippines’ capture fisheries. Lessons from the literature on collapsed fisheries offer the following options for recovery: (1 regulate or reduce fisheries exploitation and other human activities impacting the fisheries to allow fisheries to rebuild or recover, (2 enforce effective networks of marine reserves, (3 engage fishers, consumers, and other stakeholders in fisheries management, (4 improve fisheries science, monitoring, and management capacities, and (5 provide alternative livelihood, skills, and improved education to fishers and their families.

  9. 76 FR 47533 - Fisheries of the Northeastern United States; Monkfish; Framework Adjustment 7

    Science.gov (United States)

    2011-08-05

    ... 2010 stock assessment (50th Northeast Regional Stock Assessment Review Committee (SARC 50)). Framework... Fishery Management Council (Council), 50 Water Street, Newburyport, MA 01950. These documents are also... if the long-term sustainability of the monkfish fishery were affected by not establishing...

  10. Harvest Strategies for an Ecosystem Approach to Fisheries Management in Western Mediterranean Demersal Fisheries

    Directory of Open Access Journals (Sweden)

    Antoni Quetglas

    2017-04-01

    Full Text Available The serious overfishing of most Mediterranean stocks demands urgent reforms of the management measures aiming to guarantee the sustainability of resources, notably when compared with the improvement observed in other European areas. The new EU Common Fisheries Policy (CFP constitutes an excellent opportunity to introduce the changes needed for such a reform. According to this CFP, all European fish stocks should be brought to a state where they can produce at MSY by 2020 at the latest. The CFP also establishes that the objective of sustainable exploitation should be achieved through multiannual plans (MAPs adopted in consultation with relevant stakeholders having fisheries management interests such as fishermen, non-governmental organizations, and policy makers. Together with the MSY and MAP approaches, the new CFP contains several other measures, directed to guarantee the ecological and socio-economic sustainability of fisheries by means of the implementation of the ecosystem approach to fisheries management (EAFM. With this new perspective, the CFP wants to avoid past failures of fisheries management based on monospecific approaches. This study is a first step toward the application of the EAFM in the Balearic Islands by means of the development of a harvest strategy with defined objectives, targets, limits, and clear management control rules aimed at optimizing socioeconomic and ecological objectives in the framework of the new CFP. Different management scenarios designed to achieve that goal were modeled for the main demersal commercial fisheries from the study area, the bottom trawl, and small-scale fisheries. The work begins with a general description of those fisheries, their main fishing grounds, and assessments of the exploitation status of the main target stocks in order to establish the current situation. Secondly, alternative management scenarios to maximize catch and profits while considering societal objectives were evaluated by

  11. Methane flux estimation of a large seep area offshore Svalbard based on visual observations and inverse hydroacoustic modeling

    Science.gov (United States)

    Veloso, Mario; Mienert, Jurgen; De Batist, Marc; Greinert, Jens

    2014-05-01

    A seep site area at west of Prins Karl Forland (Svalbard) has been monitored since 2009 in order to evaluate its changes in space and time. Hydroacoustic data captured over four years have been used to understand the dynamic of the gas release and quantify the flow rate of gas coming from the seabed. Echograms indicate that gas release occurs between 200 and 400 mbsl and show that some of the acoustic flares reach the surface. Hydroacoustic data was captured with the EK60 echosounder system which uses a split-beam technique to determine the backscattering position inside the beam. The data obtained gives accurate information of the spatial distribution of the backscattering produced by bubble release. Gas release spot positions have been obtained using a geometrical average of spatial distribution of the backscattering, produced by the bubble cloud above the seafloor. An inverse hydroacoustic method developed by Muyakshin et al (Muyakshin et al. 2010) has been used to quantify the flow rate of the gas release. The method uses as input the backscattering volume strength (SV ) of the bubble release above the seafloor, bubble size distribution (BSD) obtained from underwater video footage and bubble rising speed (BRS) values determined by models developed by different researchers (e.g., Leifer and Patro, 2002, Woolf 1993, Mendelson 1967). Gridding and interpolation of the acoustic information obtained from Sv values has been carried out, adapting the method in order to be used over a large area. Flow rate calculations of a selected area (~220 mbsl) have been carried out (using different BRS models and merged data from different years) giving values between 220 and 347 T/yr of methane assuming continuous discharge and a bubble containing 100% of CH4. Temporal variability of methane fluxes was evaluated using the 'common' insonified areas with acoustic information of gas release over the seafloor. Comparison of calculated fluxes from common areas have shown that methane

  12. Coastal set bagnet fishery in the Payra river, Bangladesh and its impact on fisheries and biodiversity

    Directory of Open Access Journals (Sweden)

    Md. Aminul Islam

    2015-04-01

    Full Text Available Objective: To assess the catch composition and seasonal variation in catch of set bagnet fishery from the coastal Payra river, to understand the importance and impact of set bagnet fishery on biodiversity and fisheries, and to find out feasible strategies to reduce the negative impact of set bagnet fishery. Methods: The research was conducted with selection of research area, preparation of gear survey and catch assessment form, sample collection, laboratory analysis and selection of analytical methods to achieve the objectives of the study. Results: A total of 52 species belonging to 23 families were recorded from set bagnet in the Payra river. Most important commercial fishes and their annual catch by set bagnet in the study area were 51.03 MT Ilish (Tenualosa ilisha, 8.83 MT Rita (Rita rita, 6.92 MT Air (Sperata aor, 4.72 MT Chital (Chitala chitala, 2.03 MT Boal (Wallago attu, 1.84 MT Baghair (Bagarius bagarius, 3.35 MT Foli (Notopterus notopterus and 13.46 MT Golda chingri (Macrobrachium rosenbergii. All these species were mostly caught at initial stages of their life cycle, which usually move with the tidal current. Conclusions: Study suggested that set bagnet should be restricted to allowable limit with strong monitoring system for the protection and conservation of valuable fish species in the coastal areas of Bangladesh.

  13. Coastal set bagnet fishery in the Payra river, Bangladesh and its impact on fisheries and biodiversity

    Institute of Scientific and Technical Information of China (English)

    Md Aminul Islam; Md Mahfuzul Haque; Zoarder Faruque Ahmed; Sultan Mahmud; Ashfaqun Nahar; Md Emranul Ahsan; Md Moazzem Hossain

    2015-01-01

    Objective: To assess the catch composition and seasonal variation in catch of set bagnet fishery from the coastal Payra river, to understand the importance and impact of set bagnet fishery on biodiversity and fisheries, and to find out feasible strategies to reduce the negative impact of set bagnet fishery. Methods: The research was conducted with selection of research area, preparation of gear survey and catch assessment form, sample collection, laboratory analysis and selection of analytical methods to achieve the objectives of the study. Results: A total of 52 species belonging to 23 families were recorded from set bagnet in the Payra river. Most important commercial fishes and their annual catch by set bagnet in the study area were 51.03 MT Ilish (Tenualosa ilisha), 8.83 MT Rita (Rita rita), 6.92 MT Air (Sperata aor), 4.72 MT Chital (Chitala chitala), 2.03 MT Boal (Wallago attu), 1.84 MT Baghair (Bagarius bagarius), 3.35 MT Foli (Notopterus notopterus) and 13.46 MT Golda chingri (Macrobrachium rosenbergii). All these species were mostly caught at initial stages of their life cycle, which usually move with the tidal current. Conclusions: Study suggested that set bagnet should be restricted to allowable limit with strong monitoring system for the protection and conservation of valuable fish species in the coastal areas of Bangladesh.

  14. Fisheries Information Network in Indonesia.

    Science.gov (United States)

    Balachandran, Sarojini

    During the early 1980s the Indonesian government made a policy decision to develop fisheries as an important sector of the national economy. In doing so, it recognized the need for the collection and dissemination of fisheries research information not only for the scientists themselves, but also for the ultimate transfer of technology through…

  15. Fisheries Information Network in Indonesia.

    Science.gov (United States)

    Balachandran, Sarojini

    During the early 1980s the Indonesian government made a policy decision to develop fisheries as an important sector of the national economy. In doing so, it recognized the need for the collection and dissemination of fisheries research information not only for the scientists themselves, but also for the ultimate transfer of technology through…

  16. Hydro-acoustic remote sensing of benthic biological communities on the shallow South East Australian continental shelf

    Science.gov (United States)

    Rattray, Alex; Ierodiaconou, Daniel; Laurenson, Laurie; Burq, Shoaib; Reston, Marcus

    2009-09-01

    Information regarding the composition and extent of benthic habitats on the South East Australian continental shelf is limited. In this habitat mapping study, multibeam echosounder (MBES) data are integrated with precisely geo-referenced video ground-truth data to quantify benthic biotic communities at Cape Nelson, Victoria, Australia. Using an automated decision tree classification approach, 5 representative biotic groups defined from video analysis were related to hydro-acoustically derived variables in the Cape Nelson survey area. Using a combination of multibeam bathymetry, backscatter and derivative products produced highest overall accuracy (87%) and kappa statistic (0.83). This study demonstrates that decision tree classifiers are capable of integrating variable data types for mapping distributions of benthic biological assemblages, which are important in maintaining biodiversity and other system services in the marine environment.

  17. Hydroacoustic Evaluation of Juvenile Salmonid Passage and Distribution at Lookout Point Dam, 2010

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Fenton; Johnson, Gary E.; Royer, Ida M.; Hughes, James S.; Fischer, Eric S.; Trott, Donna M.; Ploskey, Gene R.

    2012-05-31

    Pacific Northwest National Laboratory evaluated juvenile salmonid passage and distribution at Lookout Point Dam (LOP) on the Middle Fork Willamette River for the U.S. Army Corps of Engineers, Portland District (USACE), to provide data to support decisions on long-term measures to enhance downstream passage at LOP and others dams in USACE's Willamette Valley Project. This study was conducted in response to the listing of Upper Willamette River Spring Chinook salmon (Oncorhynchus tshawytscha) and Upper Willamette River steelhead (O. mykiss) as threatened under the Endangered Species Act. We conducted a hydroacoustic evaluation of juvenile salmonid passage and distribution at LOP during February 2010 through January 2011. Findings from this 1 year of study should be applied carefully because annual variation can be expected due to variability in adult salmon escapement, egg-to-fry and fry-to-smolt survival rates, reservoir rearing and predation, dam operations, and weather. Fish passage rates for smolt-size fish (> {approx}90 mm and < 300 mm) were highest during December-January and lowest in mid-summer through early fall. Passage peaks were also evident in early spring, early summer, and late fall. During the entire study period, an estimated total of 142,463 fish {+-} 4,444 (95% confidence interval) smolt-size fish passed through turbine penstock intakes. Of this total, 84% passed during December-January. Run timing for small-size fish ({approx}65-90 mm) peaked (702 fish) on December 18. Diel periodicity of smolt-size fish showing crepuscular peaks was evident in fish passage into turbine penstock intakes. Relatively few fish passed into the Regulating Outlets (ROs) when they were open in summer (2 fish/d) and winter (8 fish/d). Overall, when the ROs were open, RO efficiency (RO passage divided by total project passage) was 0.004. In linear regression analyses, daily fish passage (turbines and ROs combined) for smolt-size fish was significantly related to

  18. Hydroacoustic Evaluation of Juvenile Salmonid Passage and Distribution at Detroit Dam, 2011

    Energy Technology Data Exchange (ETDEWEB)

    Khan, Fenton; Royer, Ida M.; Johnson, Gary E.; Ham, Kenneth D.

    2012-11-15

    Pacific Northwest National Laboratory evaluated juvenile salmonid passage and distribution at Detroit Dam (DET) on the North Santiam River, Oregon for the U.S. Army Corps of Engineers (USACE) to provide data to support decisions on long-term measures to enhance downstream passage at DET and others dams in USACE’s Willamette Valley Project. This study was conducted in response to regulatory requirements necessitated by the listing of Upper Willamette River Spring Chinook salmon (Oncorhynchus tshawytscha) and Upper Willamette River steelhead (O. mykiss) as threatened under the Endangered Species Act. The goal of the study was to provide information of juvenile salmonid passage and distribution at DET from February 2011 through February 2012. The results of the hydroacoustic study provide new and, in some cases, first-ever data on passage estimates, run timing, distributions, and relationships between fish passage and environmental variables at the dam. This information will inform management decisions on the design and development of surface passage and collection devices to help restore Chinook salmon populations in the North Santiam River watershed above DET. During the entire study period, an estimated total of 182,526 smolt-size fish (±4,660 fish, 95% CI) passed through turbine penstock intakes. Run timing peaked in winter and early spring months. Passage rates were highest during late fall, winter and early spring months and low during summer. Horizontal distribution for hours when both turbine units were operated simultaneously indicated Unit 2 passed almost twice as much fish as Unit 1. Diel distribution for smolt-size fish during the study period was fairly uniform, indicating fish were passing the turbines at all times of the day. A total of 5,083 smolt-size fish (± 312 fish, 95% CI) were estimated passed via the spillway when it was open between June 23 and September 27, 2011. Daily passage was low at the spillway during the June-August period, and

  19. Coexistence of fisheries with river dolphin conservation.

    Science.gov (United States)

    Kelkar, Nachiket; Krishnaswamy, Jagdish; Choudhary, Sunil; Sutaria, Dipani

    2010-08-01

    Freshwater biodiversity conservation is generally perceived to conflict with human use and extraction (e.g., fisheries). Overexploited fisheries upset the balance between local economic needs and endangered species' conservation. We investigated resource competition between fisheries and Ganges river dolphins (Platanista gangetica gangetica) in a human-dominated river system in India to assess the potential for their coexistence. We surveyed a 65-km stretch of the lower Ganga River to assess habitat use by dolphins (encounter rates) and fishing activity (habitat preferences of fishers, intensity of net and boat use). Dolphin abundance in the main channel increased from 179 (SE 7) (mid dry season) to 270 (SE 8) (peak dry season), probably as a result of immigration from upstream tributaries. Dolphins preferred river channels with muddy, rocky substrates, and deep midchannel waters. These areas overlapped considerably with fishing areas. Sites with 2-6 boats/km (moderately fished) were more preferred by dolphins than sites with 8-55 boats/km (heavily fished). Estimated spatial (85%) and prey-resource overlap (75%) between fisheries and dolphins (chiefly predators of small fish) suggests a high level of competition between the two groups. A decrease in abundance of larger fish, indicated by the fact that small fish comprised 74% of the total caught, may have intensified the present competition. Dolphins seem resilient to changes in fish community structure and may persist in overfished rivers. Regulated fishing in dolphin hotspots and maintenance of adequate dry season flows can sustain dolphins in tributaries and reduce competition in the main river. Fish-stock restoration and management, effective monitoring, curbing destructive fishing practices, secure tenure rights, and provision of alternative livelihoods for fishers may help reconcile conservation and local needs in overexploited river systems.

  20. Assessment of human health hazards associated with the dietary exposure to organic and inorganic contaminants through the consumption of fishery products in Spain

    Energy Technology Data Exchange (ETDEWEB)

    Rodríguez-Hernández, Ángel; Camacho, María; Henríquez-Hernández, Luis A.; Boada, Luis D.; Ruiz-Suárez, Norberto; Valerón, Pilar F.; Almeida González, Maira [Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria (Spain); Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria (Spain); Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria (Spain); Zaccaroni, Annalisa [Large Pelagic Vertebrate Group, Veterinary Faculty, University of Bologna, Viale Vespucci 2, Cesenatico (FC) 47042 (Italy); Zumbado, Manuel [Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria (Spain); Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria (Spain); Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria (Spain); and others

    2016-07-01

    In this work we have evaluated the potential carcinogenic and acutely toxic risks associated to the exposure to highly prevalent organic and inorganic contaminants through the consumption of fishery products by the Spanish population. The concentrations of 8 organochlorine pesticides (OCPs), 18 polychlorinated biphenils (PCBs), 7 polycyclic aromatic hydrocarbons (expressed as benzo[a]pyrene toxic equivalents (B[a]P{sub eq})), and three inorganic toxic elements [arsenic (As), cadmium (Cd), and mercury (Hg)] were determined in 93 samples of the most consumed species of white fish, blue fish, cephalopods and seafood species, which were acquired directly in markets and supermarkets in the Canary Islands, Spain. The chemical concentration data were combined with the pattern of consumption of these foodstuffs in order to calculate the daily intake of these contaminants, and on this basis the risk quotients for carcinogenicity and acute toxicity were determined for Spanish adults and children. Our results showed that the daily intake of OCPs, PCBs and B[a]P{sub eq,} which is associated to blue fish consumption was the highest within the fish group. The estimated intake of pollutants can be considered low or very low for the individual contaminants, when compared to reference values, except in the case of HCB and As. All the estimated intakes were below the reported Tolerable Daily Intakes. Considering the additive effects of multiple contaminants, the risk of acute toxic effects can also be considered as low or very low. However, our results reflect that the current consumption of white fish in adults and children, and also the blue fish in the case of adults, poses a moderate carcinogenic risk to Spanish consumers, mainly related to their concentrations of As. The conclusions of this research may be useful for the design of appropriate risk communication campaigns. - Highlights: • The daily intake of persistent pollutants through fish consumption is estimated

  1. Fisheries regulatory regimes and resilience to climate change.

    Science.gov (United States)

    Ojea, Elena; Pearlman, Isaac; Gaines, Steven D; Lester, Sarah E

    2017-05-01

    Climate change is already producing ecological, social, and economic impacts on fisheries, and these effects are expected to increase in frequency and magnitude in the future. Fisheries governance and regulations can alter socio-ecological resilience to climate change impacts via harvest control rules and incentives driving fisher behavior, yet there are no syntheses or conceptual frameworks for examining how institutions and their regulatory approaches can alter fisheries resilience to climate change. We identify nine key climate resilience criteria for fisheries socio-ecological systems (SES), defining resilience as the ability of the coupled system of interacting social and ecological components (i.e., the SES) to absorb change while avoiding transformation into a different undesirable state. We then evaluate the capacity of four fisheries regulatory systems that vary in their degree of property rights, including open access, limited entry, and two types of rights-based management, to increase or inhibit resilience. Our exploratory assessment of evidence in the literature suggests that these regulatory regimes vary widely in their ability to promote resilient fisheries, with rights-based approaches appearing to offer more resilience benefits in many cases, but detailed characteristics of the regulatory instruments are fundamental.

  2. The contribution of lakes to global inland fisheries harvest

    Science.gov (United States)

    Deines, Andrew M.; Bunnell, David B.; Rogers, Mark W.; Bennion, David; Woelmer, Whitney; Sayers, Michael J.; Grimm, Amanda G.; Shuchman, Robert A.; Raymer, Zachary B.; Brooks, Colin N.; Mychek-Londer, Justin G.; Taylor, William W.; Beard, Douglas

    2017-01-01

    Freshwater ecosystems provide numerous services for communities worldwide, including irrigation, hydropower, and municipal water; however, the services provided by inland fisheries – nourishment, employment, and recreational opportunities – are often comparatively undervalued. We provide an independent estimate of global lake harvest to improve biological and socioeconomic assessments of inland fisheries. On the basis of satellite-derived estimates of chlorophyll concentration from 80,012 globally distributed lakes, lake-specific fishing effort based on human population, and output from a Bayesian hierarchical model, we estimated that the global lake fishery harvest in the year 2011 was 8.4 million tons (mt). Our calculations excluded harvests from highly productive rivers, wetlands, and very small lakes; therefore, the true cumulative global fishery harvest from all freshwater sources likely exceeded 11 mt as reported by the Food and Agriculture Organization of the United Nations (FAO). This putative underestimate by the FAO could diminish the perceived importance of inland fisheries and perpetuate decisions that adversely affect these fisheries and millions of people.

  3. 75 FR 42610 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2010-07-22

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XX54 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine...

  4. 76 FR 58720 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2011-09-22

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XA709 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is limited...

  5. 76 FR 40836 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2011-07-12

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XA554 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine...

  6. 75 FR 59156 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2010-09-27

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XY79 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is limited...

  7. 77 FR 50952 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2012-08-23

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XC166 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine...

  8. 78 FR 51097 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2013-08-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XC783 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine...

  9. 75 FR 13731 - National Marine Fisheries Service, Pacific Fishery Management Council (Pacific Council); April 9...

    Science.gov (United States)

    2010-03-23

    ... Fisheries Service Report 2. Fishery Management Plan Amendment 2 - Annual Catch Limits and Accountability... Groundfish Fisheries 3. National Marine Fisheries Service Report 4. Part I of Management Measures for 2011... National Oceanic and Atmospheric Administration RIN 0648-XV42 National Marine Fisheries Service, Pacific...

  10. Inland capture fishery contributions to global food security and threats to their future

    Science.gov (United States)

    Youn, So-Jung; Taylor, William W.; Lynch, Abigail J.; Cowx, Ian G.; Beard, T. Douglas; Bartley, Devin; Wu, Felicia

    2014-01-01

    Inland fish and fisheries play important roles in ensuring global food security. They provide a crucial source of animal protein and essential micronutrients for local communities, especially in the developing world. Data concerning fisheries production and consumption of freshwater fish are generally inadequately assessed, often leading decision makers to undervalue their importance. Modification of inland waterways for alternative uses of freshwater (particularly dams for hydropower and water diversions for human use) negatively impacts the productivity of inland fisheries for food security at local and regional levels. This paper highlights the importance of inland fisheries to global food security, the challenges they face due to competing demands for freshwater, and possible solutions.

  11. Critical assessment of the current understanding/ knowledge of the framework of the Ecosystem Approach to Fisheries in the Mediterranean and Black Seas

    Directory of Open Access Journals (Sweden)

    Paolo Sartor

    2014-03-01

    Full Text Available A critical review was carried out involving experts from 17 countries, to identify, summarize and evaluate the current understanding related to the Ecosystem Approach to Fisheries management (EAF in the Mediterranean and Black Seas. The existing information available at country level, coming from research and monitoring projects and other types of activities, was explored. The evaluation was done following a standardized protocol and using simple semi-quantitative methods. The results highlighted an overall low-medium degree of fulfilment of the requirements of the EAF, with some differences related to the different issues considered. The highest scores were reported for the knowledge related to fleet structure/ behaviour and species/habitat distribution, whereas the lowest scores were reported for modelling, and socio-economic and management issues. Although only semi-quantitative, these results provided an initial picture at a broad regional level on the state of knowledge with a view to a proper implementation of the EAF in the Mediterranean and Black Seas, and identified gaps in scientific knowledge that should be covered.

  12. The role of genetics in fisheries management under the E.U. common fisheries policy.

    Science.gov (United States)

    Casey, J; Jardim, E; Martinsohn, J Th

    2016-12-01

    Exploitation of fish and shellfish stocks by the European Union fishing fleet is managed under the Common Fisheries Policy (CFP), which aims to ensure that fishing and aquaculture are environmentally, economically and socially sustainable and that they provide a source of healthy food for E.U. citizens. A notable feature of the CFP is its legally enshrined requirement for sound scientific advice to underpin its objectives. The CFP was first conceived in 1970 when it formed part of the Common Agricultural Policy. Its formal inception as a stand-alone regulation occurred in 1983 and since that time, the CFP has undergone reforms in 1992, 2002 and 2013, each time bringing additional challenges to the scientific advisory process as the scope of the advice increased in response to changing objectives arising from E.U. regulations and commitments to international agreements. This paper reviews the influence that genetics has had on fish stock assessments and the provision of management advice for European fisheries under successive reforms of the CFP. The developments in genetics since the inception of the CFP have given rise to a diverse and versatile set of genetic techniques that have the potential to provide significant added value to fisheries assessments and the scientific advisory process. While in some cases, notably Pacific salmon Oncorhynchus spp., genetics appear to be very well integrated into existing management schemes, it seems that for marine fishes, discussions on the use of genetics and genomics for fisheries management are often driven by the remarkable technological progress in this field, rather than imminent needs emerging from policy frameworks. An example is the recent suggestion to use environmental (e)DNA for monitoring purposes. While there is no denying that state-of-the-art genetic and genomic approaches can and will be of value to address a number of issues relevant for the management and conservation of marine renewable natural resources, a

  13. Structure and Dynamics of Fisheries in Nigeria

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The changes that have taken place in Nigerian fisheries are reviewed. Artisanal fishery has continued to dominate the fisheries, contributing over 85% of total fish production. The inland water and coastal seas are fully exploited and the increase in fishery production is not likely. Aquaculture potentials remain untapped as much as deep-sea fisheries. The combined potential of the fisheries resources-freshwater, marine and aquaculture can meet over 90% of the nation's demand for fish. Opportunities for investments, therefore, exist in the various subsectors, especially in the areas of storage, processing and preservation for the capture fishery and fish seed multiplication for aquaculture.

  14. How fisheries management can benefit from genomics?

    Science.gov (United States)

    Valenzuela-Quiñonez, Fausto

    2016-09-01

    Fisheries genomics is an emerging field that advocates the application of genomic tools to address questions in fisheries management. Genomic approaches bring a new paradigm for fisheries management by making it possible to integrate adaptive diversity to understand fundamental aspects of fisheries resources. Hence, this review is focused on the relevance of genomic approaches to solve fisheries-specific questions. Particularly the detection of adaptive diversity (outlier loci) provides unprecedented opportunity to understand bio-complexity, increased power to trace processed sample origin to allow enforcement and the potential to understand the genetic basis of micro-evolutionary effects of fisheries-induced evolution and climate change. The understanding of adaptive diversity patterns will be the cornerstone of the future links between fisheries and genomics. These studies will help stakeholders anticipate the potential effects of fishing or climate change on the resilience of fisheries stocks; consequently, in the near future, fisheries sciences might integrate evolutionary principles with fisheries management.

  15. On the sustainability of inland fisheries: Finding a future for the forgotten

    Science.gov (United States)

    Cooke, Steven J.; Allison, Edward H.; Beard, Douglas; Arlinghaus, Robert; Arthington, Angela; Bartley, Devin; Cowx, Ian G.; Fuentevilla, Carlos; Leonard, Nancy J.; Lorenzen, Kai; Lynch, Abigail; Nguyen, Vivian M.; Youn, So-Jung; Tayor, William W.; Welcomme, Robin

    2016-01-01

    At present, inland fisheries are not often a national or regional governance priority and as a result, inland capture fisheries are undervalued and largely overlooked. As such they are threatened in both developing and developed countries. Indeed, due to lack of reliable data, inland fisheries have never been part of any high profile global fisheries assessment and are notably absent from the Sustainable Development Goals. The general public and policy makers are largely ignorant of the plight of freshwater ecosystems and the fish they support, as well as the ecosystem services generated by inland fisheries. This ignorance is particularly salient given that the current emphasis on the food-water-energy nexus often fails to include the important role that inland fish and fisheries play in food security and supporting livelihoods in low-income food deficit countries. Developing countries in Africa and Asia produce about 11 million tonnes of inland fish annually, 90 % of the global total. The role of inland fisheries goes beyond just kilocalories; fish provide important micronutrients and essentially fatty acids. In some regions, inland recreational fisheries are important, generating much wealth and supporting livelihoods. The following three key recommendations are necessary for action if inland fisheries are to become a part of the food-water-energy discussion: invest in improved valuation and assessment methods, build better methods to effectively govern inland fisheries (requires capacity building and incentives), and develop approaches to managing waters across sectors and scales. Moreover, if inland fisheries are recognized as important to food security, livelihoods, and human well-being, they can be more easily incorporated in regional, national, and global policies and agreements on water issues. Through these approaches, inland fisheries can be better evaluated and be more fully recognized in broader water resource and aquatic ecosystem planning and decision

  16. On the sustainability of inland fisheries: Finding a future for the forgotten.

    Science.gov (United States)

    Cooke, Steven J; Allison, Edward H; Beard, T Douglas; Arlinghaus, Robert; Arthington, Angela H; Bartley, Devin M; Cowx, Ian G; Fuentevilla, Carlos; Leonard, Nancy J; Lorenzen, Kai; Lynch, Abigail J; Nguyen, Vivian M; Youn, So-Jung; Taylor, William W; Welcomme, Robin L

    2016-11-01

    At present, inland fisheries are not often a national or regional governance priority and as a result, inland capture fisheries are undervalued and largely overlooked. As such they are threatened in both developing and developed countries. Indeed, due to lack of reliable data, inland fisheries have never been part of any high profile global fisheries assessment and are notably absent from the Sustainable Development Goals. The general public and policy makers are largely ignorant of the plight of freshwater ecosystems and the fish they support, as well as the ecosystem services generated by inland fisheries. This ignorance is particularly salient given that the current emphasis on the food-water-energy nexus often fails to include the important role that inland fish and fisheries play in food security and supporting livelihoods in low-income food deficit countries. Developing countries in Africa and Asia produce about 11 million tonnes of inland fish annually, 90 % of the global total. The role of inland fisheries goes beyond just kilocalories; fish provide important micronutrients and essentially fatty acids. In some regions, inland recreational fisheries are important, generating much wealth and supporting livelihoods. The following three key recommendations are necessary for action if inland fisheries are to become a part of the food-water-energy discussion: invest in improved valuation and assessment methods, build better methods to effectively govern inland fisheries (requires capacity building and incentives), and develop approaches to managing waters across sectors and scales. Moreover, if inland fisheries are recognized as important to food security, livelihoods, and human well-being, they can be more easily incorporated in regional, national, and global policies and agreements on water issues. Through these approaches, inland fisheries can be better evaluated and be more fully recognized in broader water resource and aquatic ecosystem planning and decision

  17. Economic Valuation of European Commercial Fisheries under Good Environmental Status

    DEFF Research Database (Denmark)

    Goulding, Ian; Hutniczak, Barbara; Münch, Angela

    2012-01-01

    This paper focuses on assessing the economic impact of achieving Good Environmental Status in the EU’s commercial capture fisheries, being one of the descriptors listed under the MSFD in terms of landed value using 2010 prices. The approach adopted is to assess the values of landings under...

  18. Oyster Fisheries App

    Science.gov (United States)

    Perez Guerrero, Geraldo A.; Armstrong, Duane; Underwood, Lauren

    2015-01-01

    This project is creating a cloud-enabled, HTML 5 web application to help oyster fishermen and state agencies apply Earth science to improve the management of this important natural and economic resource. The Oyster Fisheries app gathers and analyzes environmental and water quality information, and alerts fishermen and resources managers about problems in oyster fishing waters. An intuitive interface based on Google Maps displays the geospatial information and provides familiar interactive controls to the users. Alerts can be tailored to notify users when conditions in specific leases or public fishing areas require attention. The app is hosted on the Amazon Web Services cloud. It is being developed and tested using some of the latest web development tools such as web components and Polymer.

  19. INTERNET IN FISHERIES

    Directory of Open Access Journals (Sweden)

    Daniel Matulić

    2006-01-01

    Full Text Available Internet is a global communication system interconnected with computer networks and intended to exchange the information of any kind. It is frequently called »network of all the networks« because it incorporates thousands and thousands of various computer networks all around the world and in order to communicate, has the same technical standards. The Internet has become an exclusive, unique source of information forever growing population. It has also become an ideal communication channel because of its dynamics, interaction, tractability and miraculously manageable updating of the content published. Nowadays, when fisheries starts playing and important role in Croatia, many people seek professional advice and guidance via Internet in order to fulfil their demanding professional tasks.

  20. Marine Ecological Footprint of Italian Mediterranean Fisheries

    Directory of Open Access Journals (Sweden)

    Federica de Leo

    2014-10-01

    Full Text Available The capacity of marine and coastal ecosystems to sustain seafood production and consumption is seldom accounted for and is not included in the signals that guide economic development. In this article, we review estimates of marine and coastal areas aimed at sustaining catches for seafood consumption. The aim of this paper is the assessment of the interactions between the environment, intended as a set of ecological subsystems in natural equilibrium, including the marine ecosystem, and the process of fisheries systems. In particular we analyze fisheries in Italy, which is the third biggest economy and the greatest consumer of seafood in the Eurozone, conducting an in-depth analysis of the Marine Ecological Footprint (MEF that evaluates the marine ecosystem area exploited by human populations to supply seafood and other marine products and services. The positioning of Italian fisheries shows a level of sustainability next to the threshold value. The analysis in the present study highlights the importance of absolute indicators in providing rough estimates about human dependence on ecological systems and recognizes the importance of those indicators, such as the Marine Footprint (expressed in % of Primary Production Required/Primary Production, in ensuring a high level of precision and accuracy in quantifying human activity impact on the environment.

  1. 78 FR 36113 - Snapper-Grouper Fishery Off the Southern Atlantic States; Regulatory Amendment 13

    Science.gov (United States)

    2013-06-17

    ... unnecessary negative socio-economic impacts to participants in the snapper-grouper fishery and fishing... environmental assessment, regulatory impact review, Regulatory Flexibility Act analysis, and fishery impact... would not have a significant economic impact on a substantial number of small entities. The...

  2. 78 FR 15707 - Gulf of Mexico Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-03-12

    ... Management Council will convene a meeting of the Standing, Special Mackerel and Ecosystem Scientific and... Integrated Ecosystems Assessment (IEA) project being conducted by the Southeast Fisheries Science Center. The... National Oceanic and Atmospheric Administration RIN 0648-XC548 Gulf of Mexico Fishery Management...

  3. Exploring optimal fishing scenarios for the multispecies artisanal fisheries of Eritrea using a trophic model

    NARCIS (Netherlands)

    Tsehaye, I.W.; Nagelkerke, L.A.J.

    2008-01-01

    This study represents the first attempt to assess the potential for fisheries in the artisanal Red Sea reef fisheries of Eritrea in an ecosystem context. We used an Ecopath with Ecosim model to integrate known aspects of the ecosystem and its inhabitants into a single framework, with the aim to gain

  4. 78 FR 35217 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery

    Science.gov (United States)

    2013-06-12

    ... Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service... for comments. SUMMARY: NMFS proposes new Federal American lobster regulations that would control lobster trap fishing effort by limiting access into the lobster trap fishery in Lobster...

  5. 78 FR 43125 - Fisheries off West Coast States; Pacific Coast Groundfish Fishery Management Plan; Commercial...

    Science.gov (United States)

    2013-07-19

    ... States; Pacific Coast Groundfish Fishery Management Plan; Commercial, Limited Entry Pacific Coast... Groundfish Fishery Management Plan (FMP). This action proposes to implement trailing actions for the program... time, the Pacific Fishery Management Council (Council) and NMFS have been addressing...

  6. 75 FR 43928 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2010-07-27

    ... review the status of the red crab fishery and recent developments in processing, marketing, and.... Thompson, Acting Director, Office of Sustainable Fisheries, National Marine Fisheries Service. BILLING...

  7. 41th Plenary Meeting Report of the Scientific, Technical and Economic Committee for Fisheries (PLEN-12-03)

    DEFF Research Database (Denmark)

    Abella, J. A.; Andersen, J.; Bailey, N.;

    The Scientific, Technical and Economic Committee for Fisheries hold its 41st plenary on 5-9 November 2012 in Brussels (Belgium). The terms of reference included both issues assessments of STECF Expert Working Group reports and additional requests submitted to the STECF by the Commission. Topics d...... dealt were inter alia assessments of Mediterranean and Black Sea stocks, evaluations of fishing effort regimes, technical measures, review of scientific advice on stocks and fisheries of EU interest, fisheries management plans evaluation issues....

  8. Hoffman etal 2016 Fisheries Data

    Data.gov (United States)

    U.S. Environmental Protection Agency — Fish collection data associated with the data analysis presented in Hoffman et al. 2016. Fisheries 41(1):26-37, DOI: 10.1080/03632415.2015.1114926. This dataset is...

  9. Does recreational catch impact the TAC for commercial fisheries?

    DEFF Research Database (Denmark)

    Eero, Margit; Strehlow, H. V.; Adams, C. M.;

    2015-01-01

    The western Baltic cod is one of the first fish stocks in Europe that, since 2013, includes recreational catches in stock assessment and fisheries management advice. In this paper, we investigate the sensitivity of the calculated commercial total allowable catch (TAC) to including recreational...... catches in stock assessment. Our results show that the most crucial aspect in terms of the impact on commercial TAC is the assumption on recreational catch dynamics relative to that of commercial fisheries used in forecast. The results were less sensitive to the information on the historical amount...... and age structure of recreational catch. Our study is intended to inform potential debates related to resource allocation between the commercial and recreational sectors and contribute to developing a general framework for incorporating recreational catches in fisheries management advice in ICES...

  10. Comparative Resilience in Five North Pacific Regional Salmon Fisheries

    Directory of Open Access Journals (Sweden)

    Xanthippe Augerot

    2010-06-01

    Full Text Available Over the past century, regional fisheries for Pacific salmon (Oncorhynchus spp. have been managed primarily for their provisioning function, not for ecological support and cultural significance. We examine the resilience of the regional salmon fisheries of Japan, the Russian Far East, Alaska, British Columbia, and Washington-Oregon-California (WOC in terms of their provisioning function. Using the three dimensions of the adaptive cycle - capital, connectedness, and resilience - we infer the resilience of the five fisheries based on a qualitative assessment of capital accumulation and connectedness at the regional scale. In our assessment, we evaluate natural capital and connectedness and constructed capital and connectedness. The Russian Far East fishery is the most resilient, followed by Alaska, British Columbia, Japan, and WOC. Adaptive capacity in the fisheries is contingent upon high levels of natural capital and connectedness and moderate levels of constructed capital and connectedness. Cross-scale interactions and global market demand are significant factors in reduced resilience. Greater attention to ecological functioning and cultural signification has the potential to increase resilience in Pacific salmon ecosystems.

  11. High-Order Hybridized Discontinuous Galerkin (HDG) Method for Wave Propagation Simulation in Complex Geophysical Media - Elastic, Acoustic and Hydro-Acoustic - an Unifying Framework to Couple Continuous Spectral Element and Discontinuous Galerkin Methods.

    Science.gov (United States)

    Sébastien, T.; Vilotte, J. P.; Guillot, L.; Mariotti, C.

    2014-12-01

    Today seismological observation systems combine broadband seismic receivers, hydrophones and micro-barometers antenna that provide complementary observations of source-radiated waves in heterogeneous and complex geophysical media. Exploiting these observations requires accurate and multi-physics - elastic, hydro-acoustic, infrasonic - wave simulation methods. A popular approach is the Spectral Element Method (SEM) (Chaljub et al, 2006) which is high-order accurate (low dispersion error), very flexible to parallelization and computationally attractive due to efficient sum factorization technique and diagonal mass matrix. However SEMs suffer from lack of flexibility in handling complex geometry and multi-physics wave propagation. High-order Discontinuous Galerkin Methods (DGMs), i.e. Dumbser et al (2006), Etienne et al. (2010), Wilcox et al (2010), are recent alternatives that can handle complex geometry, space-and-time adaptativity, and allow efficient multi-physics wave coupling at interfaces. However, DGMs are more memory demanding and less computationally attractive than SEMs, especially when explicit time stepping is used. We propose a new class of higher-order Hybridized Discontinuous Galerkin Spectral Elements (HDGSEM) methods for spatial discretization of wave equations, following the unifying framework for hybridization of Cockburn et al (2009) and Nguyen et al (2011), which allows for a single implementation of conforming and non-conforming SEMs. When used with energy conserving explicit time integration schemes, HDGSEM is flexible to handle complex geometry, computationally attractive and has significantly less degrees of freedom than classical DGMs, i.e., the only coupled unknowns are the single-valued numerical traces of the velocity field on the element's faces. The formulation can be extended to model fractional energy loss at interfaces between elastic, acoustic and hydro-acoustic media. Accuracy and performance of the HDGSEM are illustrated and

  12. 76 FR 43266 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-07-20

    ... Fisheries Service (NMFS). ACTION: Notice; Public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XA582 New England Fishery Management Council.... Howard, Executive Director, New England Fishery Management Council; telephone: (978)...

  13. Remote-sensing of Riverine Environments Utilized by Spawning Pallid Sturgeon Using a Suite of Hydroacoustic Tools and High-resolution DEMs

    Science.gov (United States)

    Elliott, C. M.; Jacobson, R. B.; DeLonay, A. J.; Braaten, P. J.

    2013-12-01

    The pallid sturgeon (Scaphirynchus albus) inhabits sandy-bedded rivers in the Mississippi River basin including the Missouri and Lower Yellowstone Rivers and has experienced decline generally associated with the fragmentation and alteration of these river systems. Knowledge gaps in the life history of the pallid sturgeon include lack of an understanding of conditions needed for successful reproduction and recruitment. We employed hydroacoustic tools to investigate habitats utilized by spawning pallid sturgeon in the Missouri River in Missouri, Kansas, Iowa, and Nebraska, and the Yellowstone River in Montana and North Dakota USA from 2008-2013. Reproductive pallid sturgeon were tracked to suspected spawning locations by field crews using either acoustic or radio telemetry, a custom mobile mapping application, and differential global positioning systems (DGPS). Female pallid sturgeon were recaptured soon after spawning events to validate that eggs had been released. Habitats were mapped at presumed spawning and embryo incubation sites using a multibeam echosounder system (MBES), sidescan sonar, acoustic Doppler current profiler, an acoustic camera and either a real-time kinematic global positioning system (RTK GPS) or DGPS. High-resolution DEM's and velocimetric maps were gridded from at a variety of scales from 0.10 to 5 meters for characterization and visualization at spawning and presumed embryo incubation sites. Pallid sturgeon spawning sites on the Missouri River are deep (6-8 meters) and have high current velocities (>1.5 meters per second). These sites are also characterized by high turbidity and high rates of bedload sediment transport in the form of migrating sand dunes. Spawning on the channelized Lower Missouri River occurs on or adjacent to coarse angular bank revetment or bedrock. Collecting biophysical information in these environmental conditions is challenging, and there is a need to characterize the substrate and substrate condition at a scale

  14. Rapid global expansion of invertebrate fisheries: trends, drivers, and ecosystem effects.

    Directory of Open Access Journals (Sweden)

    Sean C Anderson

    Full Text Available BACKGROUND: Worldwide, finfish fisheries are receiving increasing assessment and regulation, slowly leading to more sustainable exploitation and rebuilding. In their wake, invertebrate fisheries are rapidly expanding with little scientific scrutiny despite increasing socio-economic importance. METHODS AND FINDINGS: We provide the first global evaluation of the trends, drivers, and population and ecosystem consequences of invertebrate fisheries based on a global catch database in combination with taxa-specific reviews. We also develop new methodologies to quantify temporal and spatial trends in resource status and fishery development. Since 1950, global invertebrate catches have increased 6-fold with 1.5 times more countries fishing and double the taxa reported. By 2004, 34% of invertebrate fisheries were over-exploited, collapsed, or closed. New fisheries have developed increasingly rapidly, with a decrease of 6 years (3 years in time to peak from the 1950s to 1990s. Moreover, some fisheries have expanded further and further away from their driving market, encompassing a global fishery by the 1990s. 71% of taxa (53% of catches are harvested with habitat-destructive gear, and many provide important ecosystem functions including habitat, filtration, and grazing. CONCLUSIONS: Our findings suggest that invertebrate species, which form an important component of the basis of marine food webs, are increasingly exploited with limited stock and ecosystem-impact assessments, and enhanced management attention is needed to avoid negative consequences for ocean ecosystems and human well-being.

  15. Rapid global expansion of invertebrate fisheries: trends, drivers, and ecosystem effects.

    Science.gov (United States)

    Anderson, Sean C; Flemming, Joanna Mills; Watson, Reg; Lotze, Heike K

    2011-03-08

    Worldwide, finfish fisheries are receiving increasing assessment and regulation, slowly leading to more sustainable exploitation and rebuilding. In their wake, invertebrate fisheries are rapidly expanding with little scientific scrutiny despite increasing socio-economic importance. We provide the first global evaluation of the trends, drivers, and population and ecosystem consequences of invertebrate fisheries based on a global catch database in combination with taxa-specific reviews. We also develop new methodologies to quantify temporal and spatial trends in resource status and fishery development. Since 1950, global invertebrate catches have increased 6-fold with 1.5 times more countries fishing and double the taxa reported. By 2004, 34% of invertebrate fisheries were over-exploited, collapsed, or closed. New fisheries have developed increasingly rapidly, with a decrease of 6 years (3 years) in time to peak from the 1950s to 1990s. Moreover, some fisheries have expanded further and further away from their driving market, encompassing a global fishery by the 1990s. 71% of taxa (53% of catches) are harvested with habitat-destructive gear, and many provide important ecosystem functions including habitat, filtration, and grazing. Our findings suggest that invertebrate species, which form an important component of the basis of marine food webs, are increasingly exploited with limited stock and ecosystem-impact assessments, and enhanced management attention is needed to avoid negative consequences for ocean ecosystems and human well-being.

  16. Dynamic habitat models: using telemetry data to project fisheries bycatch.

    Science.gov (United States)

    Zydelis, Ramūnas; Lewison, Rebecca L; Shaffer, Scott A; Moore, Jeffrey E; Boustany, Andre M; Roberts, Jason J; Sims, Michelle; Dunn, Daniel C; Best, Benjamin D; Tremblay, Yann; Kappes, Michelle A; Halpin, Patrick N; Costa, Daniel P; Crowder, Larry B

    2011-11-01

    Fisheries bycatch is a recognized threat to marine megafauna. Addressing bycatch of pelagic species however is challenging owing to the dynamic nature of marine environments and vagility of these organisms. In order to assess the potential for species to overlap with fisheries, we propose applying dynamic habitat models to determine relative probabilities of species occurrence for specific oceanographic conditions. We demonstrate this approach by modelling habitats for Laysan (Phoebastria immutabilis) and black-footed albatrosses (Phoebastria nigripes) using telemetry data and relating their occurrence probabilities to observations of Hawaii-based longline fisheries in 1997-2000. We found that modelled habitat preference probabilities of black-footed albatrosses were high within some areas of the fishing range of the Hawaiian fleet and such preferences were important in explaining bycatch occurrence. Conversely, modelled habitats of Laysan albatrosses overlapped little with Hawaii-based longline fisheries and did little to explain the bycatch of this species. Estimated patterns of albatross habitat overlap with the Hawaiian fleet corresponded to bycatch observations: black-footed albatrosses were more frequently caught in this fishery despite being 10 times less abundant than Laysan albatrosses. This case study demonstrates that dynamic habitat models based on telemetry data may help to project interactions with pelagic animals relative to environmental features and that such an approach can serve as a tool to guide conservation and management decisions.

  17. An Evaluation of Rebuilding Policies for U.S. Fisheries.

    Science.gov (United States)

    Benson, Ashleen Julia; Cooper, Andrew B; Carruthers, Thomas R

    2016-01-01

    Rebuilding depleted fish populations is a priority of modern fisheries management. In the U.S., strong statutory mandates extend to both the goals and process by which stocks are to be rebuilt. However, the National Standard Guidelines that govern the implementation of the Magnuson-Stevens Fishery Conservation and Management Act may change to increase flexibility in rebuilding requirements. In this study we evaluate performance of the status quo approach to fish stock rebuilding in the United States against 3 alternatives that have been proposed to improve rebuilding outcomes. These alternatives either simplify the analytical requirements of rebuilding analyses or apply 'best practices' in fisheries management, thereby avoiding the need for rebuilding analyses altogether. We use a Management Strategy Evaluation framework to evaluate rebuilding options across 6 fish life history types and 5 possible real-world fishery scenarios that include options for stock assessment quality, multiple fleets, and the degree to which the stocks are overfished at the start of the analysis. We show that the status quo rebuilding plan and a harvest control rule that reduces harvest rates at low stock size generally achieve the best rebuilding outcomes across all life-history types and fishery scenarios. Both approaches constrain fishing in the short term, but achieve high catches in the medium and long term as stocks rebuild to productive levels. These results support a growing body of literature that indicates that efforts to end overfishing early pay off in the medium- to long-term with higher cumulative catches than the alternative.

  18. Projected impacts of climate change on marine fish and fisheries

    DEFF Research Database (Denmark)

    Hollowed, Anne B.; Barange, Manuel; Beamish, Richard J.;

    2013-01-01

    ) implications for food security and associated changes; and (v) uncertainty and modelling skill assessment. Climate change will impact fish and shellfish, their fisheries, and fishery-dependent communities through a complex suite of linked processes. Integrated interdisciplinary research teams are forming...... in many regions to project these complex responses. National and international marine research organizations serve a key role in the coordination and integration of research to accelerate the production of projections of the effects of climate change on marine ecosystems and to move towards a future where...

  19. Efficiency of fisheries is increasing at the ecosystem level

    DEFF Research Database (Denmark)

    Jacobsen, Nis Sand; Burgess, Matthew G; Andersen, Ken Haste

    2017-01-01

    Managing fisheries presents trade-offs between objectives, for example yields, profits, minimizing ecosystem impact, that have to be weighed against one another. These trade-offs are compounded by interacting species and fisheries at the ecosystem level. Weighing objectives becomes increasingly......-scale win-wins, especially with respect to conservation and profits, may still be common; and (iii) single-species assessment approaches may overestimate the availability of win-wins by failing to account for trade-offs across interacting species...

  20. 78 FR 57841 - Western Pacific Fishery Management Council; Public Meetings

    Science.gov (United States)

    2013-09-20

    ... Endangered or Threatened under the ESA 2. Green Turtle Status Review 3. North Pacific Humpback Whale Petition.... Draft 2013 Marine Mammal Stock Assessment Reports F. False Killer Whale Take Reduction Plan Research... Projects, Activities and Issues 1. Community Development Program Multi-fishery Proposal 2. Report on...

  1. 76 FR 13604 - Western Pacific Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-03-14

    ... National Oceanic and Atmospheric Administration RIN 0648-XA286 Western Pacific Fishery Management Council... Management Council (Council) will hold a Western Pacific Stock Assessment Review (WPSAR). DATES: The meeting... will be held at the Ilima Room, Ala Moana Hotel, 410 Atkinson Drive, Honolulu, HI 96814, telephone...

  2. 77 FR 2038 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2012-01-13

    ... paper outlining the details of a draft Fishery Management Plan Performance Evaluation process. This will... of Stock Assessment Workshop (SAW) 53 results and possibly the subsequent peer review of the Gulf of... FMP. Finally, there will be a presentation on the Rednet Project, a cooperative...

  3. 50 CFR 300.95 - Treaty Indian fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Treaty Indian fisheries. 300.95 Section 300.95 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Fraser River Sockeye and Pink Salmon Fisheries § 300.95 Treaty Indian fisheries. (a) Any...

  4. Relationships between spatial patterns of macrofauna communities, sediments and hydroacoustic backscatter data in a highly heterogeneous and anthropogenic altered environment

    Science.gov (United States)

    Gutperlet, R.; Capperucci, R. M.; Bartholomä, A.; Kröncke, I.

    2017-03-01

    A survey was conducted in the Inner Jade tidal channel, the connection between the Jade Bay and the southern North Sea, to investigate the relationships between macrofauna community structure and environmental variables in a highly heterogeneous human disturbed environment. A manual expertise based classification of sidescan sonar records was successful in confirming the general relationship between backscatter intensity and sediment grain size in weakly disturbed environments. In highly disturbed environments, instead, the classification showed the influence of the topographic roughness over the sediment roughness in backscatter intensity. Low, but significant relationships between hydroacoustic classification and macrofauna community structure, as well as sediment distribution and the macrofaunal communities were identified. The most important impact on spatial community structure was the number of days after dredging/dumping activity for the JadeWeserPort, followed by sediment characteristics. Sand dominated western stations that were dredged for the JWP exhibited a characteristic macrofaunal community. Another distinct community occurred in stations with elevated mud content within the regularly dredged old navigation channel and in the undisturbed south eastern area. The macrofaunal communities in the north eastern undisturbed area coincided with elevated gravel and shell contents. This study stresses the problems of benthic habitat mapping in such a heterogeneous area.

  5. Relationship between horizontal hydroacoustic stock estimates and gillnet catches of surface-oriented fish in shallow Lake Balaton (Hungary

    Directory of Open Access Journals (Sweden)

    György Á.I.

    2012-06-01

    Full Text Available We examined whether gillnetting and hydroacoustics provide comparable relative fish density and fish size distribution estimates in the uppermost water layer of a shallow turbid lake and whether the inclusion of environmental and stock parameters could improve comparability of data between different gears. According to gillnetting, most fish shorter than 14 cm in total length were Alburnus alburnus, and most fish longer than 14 cm were Pelecus cultratus. Size distributions and median sizes obtained from gillnetting and acoustics differed. Pure acoustics-derived density estimates accounted for only <8.8% of the variation in the gillnet catch by number and no correlation was found in biomass indices. Most variances observed in the gillnet catch-per-unit-effort data were associated with water transparency, none of the other investigated variables had significant explanatory power. We conclude that the feasibility of establishing a powerful model describing the relationship between fish density estimates of gillnetting and acoustics is low in shallow and turbid habitats, and it might be successful only if the crucial sampling and environmental parameters affecting catch efficiency of gillnets and post-processing of acoustic data are considered. This study cautions again that gillnetting should be used carefully to analyse trends of fish abundance.

  6. 78 FR 33067 - Fisheries of the United States; NOAA Fisheries Policy for Modifying Fisheries Closures in the...

    Science.gov (United States)

    2013-06-03

    ... National Oceanic and Atmospheric Administration RIN 0648-XC097 Fisheries of the United States; NOAA Fisheries Policy for Modifying Fisheries Closures in the Event of a Public Health Emergency or Oil Spill... public comment on potential adjustments to the draft policy. DATES: Written comments must be received...

  7. 76 FR 43773 - Fisheries of the Northeastern United States; Atlantic Sea Scallop Fishery; Framework Adjustment 22

    Science.gov (United States)

    2011-07-21

    ... access general category (LAGC) fleets; open area days-at-sea (DAS) and Sea Scallop Access Area (access... Part 648 Fisheries of the Northeastern United States; Atlantic Sea Scallop Fishery; Framework... 0648-BA72 Fisheries of the Northeastern United States; Atlantic Sea Scallop Fishery;...

  8. 77 FR 73433 - Appointments to a Recreational Fisheries Working Group by the Marine Fisheries Advisory Committee

    Science.gov (United States)

    2012-12-10

    ... Working Group by the Marine Fisheries Advisory Committee AGENCY: National Marine Fisheries Service (NMFS.... SUMMARY: Nominations are being solicited for appointment to a Recreational Fisheries Working Group of the... Recreational Fisheries Working Group (RFWG) in 2010, to assist it in the development of recommendations to...

  9. 75 FR 3416 - Fisheries in the Western Pacific; Pelagic Fisheries; Vessel Identification Requirements

    Science.gov (United States)

    2010-01-21

    ... National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-AX38 Fisheries in the Western Pacific; Pelagic Fisheries; Vessel Identification Requirements AGENCY: National Marine Fisheries Service... INFORMATION CONTACT: Jarad Makaiau, Sustainable Fisheries, NMFS PIR, 808-944-2108. SUPPLEMENTARY...

  10. 78 FR 54399 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2013-09-04

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC815 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS... December 31, 2013. FOR FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist,...

  11. 78 FR 64182 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2013-10-28

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC921 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS... FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist, 978-281-9224....

  12. 75 FR 74005 - Fisheries of the Northeastern United States; Monkfish Fishery; Scoping Process

    Science.gov (United States)

    2010-11-30

    ... National Oceanic and Atmospheric Administration RIN 0648-BA50 Fisheries of the Northeastern United States; Monkfish Fishery; Scoping Process AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... statement (EIS) and scoping meetings; request for comments. SUMMARY: The New England Fishery...

  13. 76 FR 53832 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Decrease...

    Science.gov (United States)

    2011-08-30

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA652 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Decrease for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration...

  14. 77 FR 76424 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2012-12-28

    ... Administration 50 CFR Part 648 [Docket No. 120201086-2418-02] RIN 0648-XC394 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS), National... FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist, 978-281-9224....

  15. 75 FR 57249 - Fisheries of the Northeastern United States; Northeast (NE) Multispecies Fishery; Charter/Party...

    Science.gov (United States)

    2010-09-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BA09 Fisheries of the Northeastern United States; Northeast (NE) Multispecies Fishery; Charter/Party Fishery Control Date AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce....

  16. 77 FR 22678 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-04-17

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648- XB145 Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the Trimester 1 Longfin Squid Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and...

  17. Fishery Management Plan : Tamarac National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Fishery Management Plan for Tamarac NWR provides an inventory of fishery resources on the Refuge including a description of the water area and fish sampling...

  18. Fisheries Management Plan : Muscatatuck National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Fisheries Management Plan for Muscatatuck NWR provides an introduction to the Refuge, summarizes the relationship of fishery management to Refuge objectives,...

  19. Observer Coverage of the Southeastern Shrimp Fisheries

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Vessel, gear and biological data collected by fishery observers from the Gulf of Mexico and South Atlantic commerical shrimp fishery.

  20. Magnuson-Stevens Fishery Conservation Act

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Magnuson-Stevens Fishery Conservation and Management Act (MSA) is the primary law governing marine fisheries management in U.S. federal waters. It has since been...

  1. 76 FR 23728 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Snapper-Grouper Fishery Off the...

    Science.gov (United States)

    2011-04-28

    ... 17A to the FMP. The intended effect of this final rule is to minimize socio-economic impacts to... environmental assessment and a regulatory impact review, may be obtained from the South Atlantic Fishery... public comments specific to the IRFA or concerning the economic impacts of the rule more generally...

  2. 75 FR 74650 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Science.gov (United States)

    2010-12-01

    ... academic institutions. Furthermore, NOAA's Southeast Fisheries Science Center reviews and certifies that.... Comments indicated a complete closure of both sectors would be more fair and that commercial fishermen... how the assessment projects the status of the stock. If these discrepancies show a more...

  3. 78 FR 14983 - Fisheries of the Gulf of Mexico; Gulf of Mexico Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-03-08

    ...Independent peer review of Gulf of Mexico Spanish Mackerel and Cobia stocks will be accomplished through written reviews because delays in completing the assessments prevented their consideration at the SEDAR 28 Review Workshop. This workshop is being held by the Gulf of Mexico Fishery Management Council to consider recommendations from the written reviews and develop recommendations for the......

  4. Trust and new modes of fisheries governance

    OpenAIRE

    Vos, de, Ans

    2011-01-01

     It is a commonplace today that many of the world’s commercial fisheries are in a state of crisis. As a response to the state of fisheries management, a large array of governance innovations has been deployed over the past two decades in many fisheries industries worldwide. In these new governance arrangements state, market, and/or civil society actors participate while striving for a more sustainable fisheries industry. These new governance arrangements influence social relations,...

  5. Economic Incentives and Global Fisheries Sustainability

    OpenAIRE

    Christopher Costello; John Lynham; Sarah E. Lester; Gaines, Steven D.

    2010-01-01

    Widespread global collapses of fisheries corroborate decades-old predictions by economists, made long before large-scale industrialization of the world's fisheries, that open access would have deleterious ecological and economic effects on fishery resources. Incentive-based alternatives (collectively called catch shares) have been shown to generate pecuniary benefits, but little empirical evidence exists for, or against, a link to global fisheries sustainability. We report and expand on an an...

  6. Technological development in fisheries management

    DEFF Research Database (Denmark)

    Eigaard, Ole Ritzau; Marchal, Paul; Gislason, Henrik

    2014-01-01

    increases by 3.2% per year due to technological developments, an increase often ignored in fisheries management. The documentation and quantification of technological creep improves the basis for successfully integrating the effects of technological development (and catchability changes) in fisheries...... management regulations and policies. Ways of counteracting the undesired effects of technological creep are discussed as are the potential management benefits from improved fishing technology. Specific suggestions are given on the selection, application, and tuning of fisheries management tools that can......Many marine fish stocks are overexploited and considerable overcapacity exists in fishing fleets worldwide. One of the reasons for the imbalance between resource availability and fishing capacity is technological development, which continuously increases the efficiency of the vessels—a mechanism...

  7. Is the Dutch shrimp fishery sustainable?

    NARCIS (Netherlands)

    Welleman, H.C.; Daan, N.

    2001-01-01

    The fishery of the brown shrimp (Crangon crangon LINNEAUS 1758) is a widespread human activity in the coastal zone. Yet management of this fishery has never been implemented. The question is raised whether an uncontrolled fishery is sustainable or the conceivable ecological stress results in

  8. Trust and new modes of fisheries governance

    NARCIS (Netherlands)

    Vos, de B.I.

    2011-01-01

     It is a commonplace today that many of the world’s commercial fisheries are in a state of crisis. As a response to the state of fisheries management, a large array of governance innovations has been deployed over the past two decades in many fisheries industries worldwide. In these new g

  9. 75 FR 23245 - American Lobster Fishery Management

    Science.gov (United States)

    2010-05-03

    ... National Oceanic and Atmospheric Administration RIN 0648-AT31 American Lobster Fishery Management AGENCY... American lobster fishery in Federal waters. The management actions are based on recommendations to NMFS by... Fishery Management Plan for American Lobster (ISFMP). Two of the three proposed management...

  10. Increased competition for aquaculture from fisheries

    DEFF Research Database (Denmark)

    Jensen, Frank; Nielsen, Max; Nielsen, Rasmus

    2014-01-01

    ; and supplies from aquaculture have grown continuously. In this paper, the impact of improved fisheries management on aquaculture growth is studied assuming perfect substitution between farmed and wild fish. We find that improved fisheries management, ceteris paribus, reduces the growth potential of global...... aquaculture in markets where wild fisheries constitute a large share of total supply....

  11. Trust and new modes of fisheries governance

    NARCIS (Netherlands)

    Vos, de B.I.

    2011-01-01

     It is a commonplace today that many of the world’s commercial fisheries are in a state of crisis. As a response to the state of fisheries management, a large array of governance innovations has been deployed over the past two decades in many fisheries industries worldwide. In these new

  12. Is the Dutch shrimp fishery sustainable?

    NARCIS (Netherlands)

    Welleman, H.C.; Daan, N.

    2001-01-01

    The fishery of the brown shrimp (Crangon crangon LINNEAUS 1758) is a widespread human activity in the coastal zone. Yet management of this fishery has never been implemented. The question is raised whether an uncontrolled fishery is sustainable or the conceivable ecological stress results in recruit

  13. Fishery potential along the Indian coastal waters between Porbandar and Ratnagiri

    Digital Repository Service at National Institute of Oceanography (India)

    Gajbhiye, S.N.; Mehta, P.; Mustafa, S.; Nair, V.R.

    As part of the ongoing marine pollution monitoring programme the coastal stretch between Porbandar and Ratnagiri was considered to assess the fishery potential. Regular experimental trawling was done off Porbandar, Veraval, Diu, Hazira, Daman...

  14. Perceptions of fish habitat conditions in Oklahoma tailwater fisheries: a survey of fisheries managers

    Science.gov (United States)

    Long, James M.

    2011-01-01

    While the downstream effects of dams on fish habitat have long been recognized, broad-scale assessments of tailwater fish habitat have rarely been conducted. In this paper, I report on the status of tailwater fisheries in Oklahoma as determined through a web-based survey of fisheries biologists with the Oklahoma Department of Wildlife Conservation conducted in July 2010. Respondents addressed 38 tailwaters, encompassing all major areas of the state. The majority of fish species comprising these fisheries included blue catfish (Ictalurus furcatus), followed by white bass (Morone chrysops), channel catfish (I. punctatus) and flathead catfish (Pylodictis olivaris). Most respondents indicated no or low concerns with fish habitat in tailwaters under their management supervision; only two tailwaters (Tenkiller Ferry and Fort Gibson) had the majority of concerns with fish habitat identified as high to moderately high. Principal components analysis and subsequent correlation analysis showed that tailwaters that scored high for issues related to shoreline erosion, change in water depth, flow fluctuations, and flow timing were associated with dams with large maximum discharge ability. No other factors related to fish habitat condition in tailwaters were found. In Oklahoma, dams with maximum discharge of at least 6,767.5 m3 sec–1 were more likely to have flow-related fish habitat concerns in the tailwater.

  15. CROATIAN FISHERY IN 2003 YEAR

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2004-12-01

    Full Text Available This work deals with the analysis and sublimation of all the relevant informations regarding fisheries in Republic of Croatia. This means that there were processed data about freshwater fisheries (farming of freshwater fish and other aquatic organisms, commercial and sports fisheries, marine fisheries (mariculture, commercial fisheries, small–scale fisheries and processing of fish products, import and export of fish and fish products as well as the financial subventions regarding fisheries. The farming of freshwater fish in 2003 is marked by the decrease of production comparing to the past 5 years. Carp is furthermore the most dominant fish species in freshwater fish farming, but it’s percentage is decreasing, and the percentage of the trout is increasing over the years. In addition to the decrease of production, the areas of production are decreasing as well, and now they are the smallest in the past decade — 6,281.97 ha. In 2003 the amount of used food is also decreased, but the amount of used fertilizers and lime is increased, that means it is the biggest in the past decade. This is caused by the bad climate conditions during the summer. Marine fisheries farming (mariculture in 2003 is in a slightly better position then the freshwater fish farming. The production of white fish species, which was reached before few years, is not changing — 2,510 tons, also the farming of oysters is stagnating, but in the past few years the farming of mussels and tuna fish is increasing. The total marine fish catch is 29,102 tons and it is performed over 34,000 km2, comparing to the 2002 it is increased by almost 49.24%. Additional to the increase of the total catch the number of commercial fishermen and fishing vessels is also increased. The number of fisherman which fish for their own consumption without the right to sell fish, that means the small–scale fishermen in 2003 is 13,500. The production of fish and fish products in 2003 is 19,000 tons

  16. Using standardized fishery data to inform rehabilitation efforts

    Science.gov (United States)

    Spurgeon, Jonathan J.; Stewart, Nathaniel T.; Pegg, Mark A.; Pope, Kevin L.; Porath, Mark T.

    2016-01-01

    Lakes and reservoirs progress through an aging process often accelerated by human activities, resulting in degradation or loss of ecosystem services. Resource managers thus attempt to slow or reverse the negative effects of aging using a myriad of rehabilitation strategies. Sustained monitoring programs to assess the efficacy of rehabilitation strategies are often limited; however, long-term standardized fishery surveys may be a valuable data source from which to begin evaluation. We present 3 case studies using standardized fishery survey data to assess rehabilitation efforts stemming from the Nebraska Aquatic Habitat Plan, a large-scale program with the mission to rehabilitate waterbodies within the state. The case studies highlight that biotic responses to rehabilitation efforts can be assessed, to an extent, using standardized fishery data; however, there were specific areas where minor increases in effort would clarify the effectiveness of rehabilitation techniques. Management of lakes and reservoirs can be streamlined by maximizing the utility of such datasets to work smarter, not harder. To facilitate such efforts, we stress collecting both biotic (e.g., fish lengths and weight) and abiotic (e.g., dissolved oxygen, pH, and turbidity) data during standardized fishery surveys and designing rehabilitation actions with an appropriate experimental design.

  17. Banks Lake Fishery Evaluation Project Annual Report : Fiscal Year 2008 (March 1, 2008 to February 1, 2009).

    Energy Technology Data Exchange (ETDEWEB)

    Polacek, Matt [Washington Department of Fish and Wildlife

    2009-07-15

    The Washington Department of Fish and Wildlife implemented the Banks Lake Fishery Evaluation Project (BLFEP) in September 2001 with funds from the Bonneville Power Administration, and continued project tasks in 2008. The objective was to evaluate factors that could limit kokanee in Banks Lake, including water quality, prey availability, harvest, and acute predation during hatchery releases. Water quality parameters were collected twice monthly from March through November. Banks Lake water temperatures began to increase in May and stratification was apparent by July. By late August, the thermocline had dropped to 15 meters deep, with temperatures of 21-23 C in the epilimnion and 16-19 C in the hypolimnion. Dissolved oxygen levels were generally above 8 mg/L until August when they dropped near or below 5 mg/L deeper than 20-meters. Secchi depths ranged from 3.2 to 6.2 meters and varied spatially and temporally. Daphnia and copepod densities were the highest in May and June, reaching densities of 26 copepods/liter and 9 Daphnia/liter. Fish surveys were conducted in July and October 2008 using boat electrofishing, gill netting, and hydroacoustic surveys. Lake whitefish (71%) and yellow perch (16%) dominated the limnetic fish assemblage in the summer, while lake whitefish (46%) and walleye (22%) were the most abundant in gill net catch during the fall survey. Piscivore diets switched from crayfish prior to the release of rainbow trout to crayfish and rainbow trout following the release. The highest angling pressure occurred in May, when anglers were primarily targeting walleye and smallmouth bass. Boat anglers utilized Steamboat State Park more frequently than any other boat ramp on Banks Lake. Shore anglers used the rock jetty at Coulee City Park 45% of the time, with highest use occurring from November through April. Ice fishing occurred in January and February at the south end of the lake. An estimated total of 4,397 smallmouth bass, 11,106 walleye, 371 rainbow trout

  18. Fisheries conservation on the high seas: linking conservation physiology and fisheries ecology for the management of large pelagic fishes.

    Science.gov (United States)

    Horodysky, Andrij Z; Cooke, Steven J; Graves, John E; Brill, Richard W

    2016-01-01

    Populations of tunas, billfishes and pelagic sharks are fished at or over capacity in many regions of the world. They are captured by directed commercial and recreational fisheries (the latter of which often promote catch and release) or as incidental catch or bycatch in commercial fisheries. Population assessments of pelagic fishes typically incorporate catch-per-unit-effort time-series data from commercial and recreational fisheries; however, there have been notable changes in target species, areas fished and depth-specific gear deployments over the years that may have affected catchability. Some regional fisheries management organizations take into account the effects of time- and area-specific changes in the behaviours of fish and fishers, as well as fishing gear, to standardize catch-per-unit-effort indices and refine population estimates. However, estimates of changes in stock size over time may be very sensitive to underlying assumptions of the effects of oceanographic conditions and prey distribution on the horizontal and vertical movement patterns and distribution of pelagic fishes. Effective management and successful conservation of pelagic fishes requires a mechanistic understanding of their physiological and behavioural responses to environmental variability, potential for interaction with commercial and recreational fishing gear, and the capture process. The interdisciplinary field of conservation physiology can provide insights into pelagic fish demography and ecology (including environmental relationships and interspecific interactions) by uniting the complementary expertise and skills of fish physiologists and fisheries scientists. The iterative testing by one discipline of hypotheses generated by the other can span the fundamental-applied science continuum, leading to the development of robust insights supporting informed management. The resulting species-specific understanding of physiological abilities and tolerances can help to improve stock

  19. Untying the Mediterranean Gordian Knot: A Twenty First Century Challenge for Fisheries Management

    Directory of Open Access Journals (Sweden)

    Ilaria Vielmini

    2017-06-01

    Full Text Available Management of fisheries in the Mediterranean basin has often been described as a unique and complex challenge, due to their multi-specificity, the diversity of gear-types, and the number of nations involved. This perspective has gone hand-in-hand for decades with a lack of strong political will from decision-makers, who have been unwilling to put Mediterranean fisheries management high on their agendas. Over time, exploitation rates of demersal stocks have increased and in 2016, 97% of shared stocks assessed in the Mediterranean were reported to be overfished. An alarm bell about the chronic overfishing of Mediterranean fish stocks was rung by European policy makers in 2015, exactly 20 years after the Code of Conduct for Responsible Fisheries adopted by the Food and Agriculture Organization mandated that states should ensure the sustainable use of fishery resources. In this perspective, we: (i review the context of fisheries management in the Mediterranean; (ii identify the potential factors that may have hindered management and; (iii discuss how the reformed European Union Common Fisheries Policy and the binding commitments laid down in its text may lead to knock-on effects for fisheries management in the international Mediterranean context, if properly implemented. In this line, we also present the example of demersal fisheries management in the Strait of Sicily, which may represent a starting point for science-based management in the Mediterranean.

  20. Global fishery prospects under contrasting management regimes

    OpenAIRE

    Costello, Christopher; Ovando, Daniel; Clavelle, Tyler; Strauss, C. Kent; Hilborn, Ray; Melnychuk, Michael C; Branch, Trevor A; Steven D Gaines; Szuwalski, Cody S.; Cabral, Reniel B.; Rader, Douglas N.; Leland, Amanda

    2016-01-01

    What would extensive fishery reform look like? In addition, what would be the benefits and trade-offs of implementing alternative approaches to fisheries management on a worldwide scale? To find out, we assembled the largest-of-its-kind database and coupled it to state-of-the-art bioeconomic models for more than 4,500 fisheries around the world. We find that, in nearly every country of the world, fishery recovery would simultaneously drive increases in food provision, fishery profits, and fis...

  1. Yakima Fisheries Project : Revised Draft Environmental Impact Statement.

    Energy Technology Data Exchange (ETDEWEB)

    United States. Bonneville Power Administration.

    1995-05-01

    BPA proposes to fund several fishery-related activities in the Yakima River Basin. The Yakima Fisheries Project (YFP), included in the Northwest Power Planning Council`s fish and wildlife program, would be jointly managed by the State of Washington and the Yakima Indian Nation. Fisheries resources in the Yakima River are severely reduced from historical levels and there is a significant potential for enhancement of these resources. BPA`s proposed action is to fund (1) information gathering on the implementation of supplementation techniques and on feasibility of reintroducing coho salmon in an environment where native populations have become extinct; (2) research activities based on continuous assessment, feedback and improvement of research design and activities ({open_quotes}adaptive management{close_quotes}); and (3) the construction, operation, and maintenance of facilities for supplementing populations of upper Yakima spring chinook salmon. The project has been considerably revised from the original proposal described in the first draft EIS. Examined in addition to No Action (which would leave present anadromous fisheries resources unchanged in the, Basin) are two alternatives for action: (1) supplementation of depressed natural populations of upper Yakima spring chinook and (2) that same supplementation plus a study to determine the feasibility of re-establishing (via stock imported from another basin) naturally spawning population and a significant fall fishery for coho in the Yakima Basin. Alternative 2 has been identified as the preferred action. Major issues examined in the Revised Draft EIS include potential impacts of the project on genetic and ecological resources of existing fish populations, on water quality and quantity, on threatened and endangered species listed under the Endangered Species Act, and on the recreational fishery.

  2. Research agenda shrimp pulse fishery

    NARCIS (Netherlands)

    Marlen, van B.; Rasenberg, M.M.M.; Verschueren, B.; Polet, H.

    2015-01-01

    In the recent decennia, many developments have taken place to improve the selectivity of the shrimp fishing gears. Recently, the development of a pulse gear for catching shrimps has taken up again as an opportunity to decrease discards, inspired by developments in the flatfish pulse fishery.

  3. New modes of fisheries governance

    NARCIS (Netherlands)

    Vos, de B.I.; Döring, R.; Aranda, M.; Buisman, F.C.; Frangoudes, K.; Goti, L.; Macher, C.; Maravelias, C.D.; Murillas-Maza, A.; Valk, van der O.; Vasilakopoulos, P.

    2016-01-01

    Fisheries policy is increasingly influenced by civil society organizations. The newest example of this is the formulation of the landing obligation, a regulation that should reduce the contested practice of discarding unwanted fish. In this paper the implementation process of the landing

  4. Solving complex fisheries management problems

    DEFF Research Database (Denmark)

    Petter Johnsen, Jahn; Eliasen, Søren Qvist

    2011-01-01

    A crucial issue for the new EU common fisheries policy is how to solve the discard problem. Through a study of the institutional set up and the arrangements for solving the discard problem in Denmark, the Faroe Islands, Iceland and Norway, the article identifies the discard problem as related...

  5. Work sharing in Kerela's fisheries

    NARCIS (Netherlands)

    Berg, van den M.M.; Lensing, B.J.

    2007-01-01

    Earlier studies suggest that once population growth and market integration reach a certain critical level, traditional practices of work sharing tend to degenerate or disappear altogether. Work sharing has, however, survived to date in small-scale fisheries in Kerala, India. Artisanal fishermen

  6. Market-Based Fisheries Management

    DEFF Research Database (Denmark)

    Høst, Jeppe Engset

    This book reveals how a privatization of fish resources has paved the way for a wide-reaching concentration and change in ownership. It is a thought-provoking contribution to the debate on the future of European fisheries and the possible solutions to overfishing in Europe. Readers will discover...

  7. Global marine primary production constrains fisheries catches.

    Science.gov (United States)

    Chassot, Emmanuel; Bonhommeau, Sylvain; Dulvy, Nicholas K; Mélin, Frédéric; Watson, Reg; Gascuel, Didier; Le Pape, Olivier

    2010-04-01

    Primary production must constrain the amount of fish and invertebrates available to expanding fisheries; however the degree of limitation has only been demonstrated at regional scales to date. Here we show that phytoplanktonic primary production, estimated from an ocean-colour satellite (SeaWiFS), is related to global fisheries catches at the scale of Large Marine Ecosystems, while accounting for temperature and ecological factors such as ecosystem size and type, species richness, animal body size, and the degree and nature of fisheries exploitation. Indeed we show that global fisheries catches since 1950 have been increasingly constrained by the amount of primary production. The primary production appropriated by current global fisheries is 17-112% higher than that appropriated by sustainable fisheries. Global primary production appears to be declining, in some part due to climate variability and change, with consequences for the near future fisheries catches.

  8. Small-scale fisheries in Greenlandic planning

    DEFF Research Database (Denmark)

    Jacobsen, Rikke Becker

    2013-01-01

    This article analyses an ongoing planning process in Greenlandic fisheries governance aiming to reform the coastal Greenland halibut fishery. It examines the way certain truths about this fishery and the need for reform are produced up to and in the final policy document ‘regulation concerning...... the coastal fishery for Greenland halibut’. Findings highlight the way the small-scale Greenland halibut fishery system becomes a particular governance problem with respect to particular contextual meanings of sustainability and long-term planning. The article then examines whether this governance problem...... could also be understood as primarily a problem to a certain ‘governmentality’ mode of governance. Whereas some fishery studies document how governmentality modes of governance in fisheries succeeds in transforming subjectivities, this study offers a view into the process that might go before successful...

  9. Lake Roosevelt Fisheries Monitoring Progam; Thyroid-Induced Chemical Imprinting in Early Life Stages and Assessment of Smoltification in Kokanee Salmon Implications for Operating Lake Roosevelt Kokanee Salmon Hatcheries; 1993 Supplement Report.

    Energy Technology Data Exchange (ETDEWEB)

    Tilson, Mary Beth; Galloway, Heather; Scholz, Allan T. (Eastern Washington University, Upper Columbia United Tribes Fisheries Research Center, Cheney, WA)

    1994-06-01

    In 1991, two hatcheries were built to provide a kokanee salmon and rainbow trout fishery for Lake Roosevelt as partial mitigation for the loss of anadromous salmon and steelhead caused by construction of Grand Coulee Dam. The Sherman Creek Hatchery, located on a tributary of Lake Roosevelt to provide an egg collection and imprinting site, is small with limited rearing capability. The second hatchery was located on the Spokane Indian Reservation because of a spring water source that supplied cold, pure water for incubating and rearing eggs.`The Spokane Tribal Hatchery thus serves as the production facility. Fish reared there are released into Sherman Creek and other tributary streams as 7-9 month old fry. However, to date, returns of adult fish to release sites has been poor. If hatchery reared kokanee imprint to the hatchery water at egg or swim up stages before 3 months of age, they may not be imprinting as 7-9 month old fry at the time of stocking. In addition, if these fish undergo a smolt phase in the reservoir when they are 1.5 years old, they could migrate below Grand Coulee Dam and out of the Lake Roosevelt system. In the present investigation, which is part of the Lake Roosevelt monitoring program to assess hatchery effectiveness, kokanee salmon were tested to determine if they experienced thyroxine-induced chemical imprinting and smoltification similar to anadromous salmonids. Determination of the critical period for olfactory imprinting was determined by exposing kokanee to different synthetic chemicals (morpholine or phenethyl alcohol) at different life stages, and then measuring the ability to discriminate the chemicals as sexually mature adults. Whole body thyroxine content and blood plasma thyroxine concentration was measured to determine if peak thyroid activity coincided with imprinting or other morphological, physiological or behavioral transitions associated with smoltification.

  10. The last glaciation and deglaciation of the Northeast Greenland continental shelf revealed by hydro-acoustic data

    Science.gov (United States)

    Arndt, Jan Erik; Jokat, Wilfried; Dorschel, Boris

    2017-03-01

    About 16% of the Greenland Ice Sheet drains in the area of the Northeast Greenland shelf between 76°N and 80.5°N via marine terminating glaciers. Most of it is via the Northeast Greenland Ice Stream, the largest ice stream of Greenland. During ice ages, the ice sheet extended onto the continental shelf and modern-day cross-shelf troughs were filled by ice streams. In this study, high-resolution hydro-acoustic data acquired during three decades of research were jointly investigated to reveal the past glacial conditions. Our data shows that Westwind Trough and Norske Trough were filled by fast flowing ice streams that extended to the shelf edge during the last glacial maximum. In between the cross-shelf troughs, ice domes resided on shallow banks that may have contributed about a decimetre to global sea level. Most probably these ice domes initiated fast ice flow through sinks in the inter-trough area. In Westwind Trough, ice sheet retreat to the inner shelf after the last glacial maximum was intermittent. In contrast, in Norske Trough the ice sheet retreat appears relatively rapid with no evidences for phases of grounding line stabilization. Probably during the Younger Dryas, the ice sheet readvanced to a mid-shelf position in both troughs documented by grounding zone wedges. During this time, a thick ice shelf was present in Norske Trough releasing tabular icebergs. Ice sheet retreat from the mid-shelf to the coastline during Holocene deglaciation was rapid.

  11. Environmental effects on cephalopod population dynamics: implications for management of fisheries.

    Science.gov (United States)

    Rodhouse, Paul G K; Pierce, Graham J; Nichols, Owen C; Sauer, Warwick H H; Arkhipkin, Alexander I; Laptikhovsky, Vladimir V; Lipiński, Marek R; Ramos, Jorge E; Gras, Michaël; Kidokoro, Hideaki; Sadayasu, Kazuhiro; Pereira, João; Lefkaditou, Evgenia; Pita, Cristina; Gasalla, Maria; Haimovici, Manuel; Sakai, Mitsuo; Downey, Nicola

    2014-01-01

    Cephalopods are a relatively small class of molluscs (~800 species), but they support some large industrial scale fisheries and numerous small-scale, local, artisanal fisheries. For several decades, landings of cephalopods globally have grown against a background of total finfish landings levelling off and then declining. There is now evidence that in recent years, growth in cephalopod landings has declined. The commercially exploited cephalopod species are fast-growing, short-lived ecological opportunists. Annual variability in abundance is strongly influenced by environmental variability, but the underlying causes of the links between environment and population dynamics are poorly understood. Stock assessment models have recently been developed that incorporate environmental processes that drive variability in recruitment, distribution and migration patterns. These models can be expected to improve as more, and better, data are obtained on environmental effects and as techniques for stock identification improve. A key element of future progress will be improved understanding of trophic dynamics at all phases in the cephalopod life cycle. In the meantime, there is no routine stock assessment in many targeted fisheries or in the numerous by-catch fisheries for cephalopods. There is a particular need for a precautionary approach in these cases. Assessment in many fisheries is complicated because cephalopods are ecological opportunists and stocks appear to have benefited from the reduction of key predator by overexploitation. Because of the complexities involved, ecosystem-based fisheries management integrating social, economic and ecological considerations is desirable for cephalopod fisheries. An ecological approach to management is routine in many fisheries, but to be effective, good scientific understanding of the relationships between the environment, trophic dynamics and population dynamics is essential. Fisheries and the ecosystems they depend on can only be

  12. 40th Plenary Meeting Report of the Scientific, Technical and Economic Committee for Fisheries (PLEN-12-02)

    DEFF Research Database (Denmark)

    Abella, J. A.; Andersen, J.; Bailey, N.;

    The Scientific, Technical and Economic Committee for Fisheries hold its 40th plenary on 9-13 July 2012 in Copenhagen (Denmark). The terms of reference included both issues assessments of STECF Expert Working Group reports and additional requests submitted to the STECF by the Commission. Topics de...... dealt with ranged from fisheries economics to management plan evaluation issues....

  13. 39th Plenary Meeting Report of the Scientific, Technical and Economic Committee for Fisheries (PLEN-12-01)

    DEFF Research Database (Denmark)

    Abella, J. A.; Andersen, J.; Bailey, N.;

    The Scientific, Technical and Economic Committee for Fisheries hold its 39th plenary on 16-20 April 2012 in Brussels (Belgium). The terms of reference included both issues assessments of STECF Expert Working Group reports and additional requests submitted to the STECF by the Commission. Topics de...... dealt with ranged from fisheries economics to management plan evaluation issues....

  14. Cooperation between scientists, NGOs and industry in support of sustainable fisheries: the South African hake Merluccius spp. trawl fishery experience.

    Science.gov (United States)

    Field, J G; Attwood, C G; Jarre, A; Sink, K; Atkinson, L J; Petersen, S

    2013-10-01

    This paper examines the increasingly close interaction between natural and social scientists, non-governmental organizations (NGO) and industry, in pursuit of responsible ecosystem-based management of fisheries. South Africa has committed to implementing an ecosystem approach to fisheries management. Management advice stems from multi-stakeholder representation on government-led scientific and management working groups. In the hake Merluccius capensis and Merluccius paradoxus fishery, the primary management measure is an annual total allowable catch (TAC), the level of which is calculated using a management procedure (MP) that is revised approximately every 4 years. Revision of the MP is a consultative process involving most stakeholders, and is based on simulation modelling of projected probable scenarios of resource and fishery dynamics under various management options. NGOs, such as the Worldwide Fund for Nature in South Africa (WWF-SA), have played an important role in influencing consumers, the fishing industry and government to develop responsible fishing practices that minimize damage to marine ecosystems. Cooperation between industry, government and scientists has helped to improve sustainability and facilitated the meeting of market-based incentives for more responsible fisheries. Research includes ecosystem modelling, spatial analysis and ecosystem risk assessment with increasing research focus on social and economic aspects of the fishery. A four-year cooperative experiment to quantify the effect of trawling on benthic community structure is being planned. The food requirements of top predators still need to be included in the TAC-setting formulae and more social and economic research is needed. This paper also demonstrates how NGO initiatives such as Marine Stewardship Council certification and the Southern African Sustainable Seafood Initiative, a traffic light system of classifying seafood for consumers, have contributed to responsible fishing

  15. Global fishery prospects under contrasting management regimes

    Science.gov (United States)

    Costello, Christopher; Ovando, Daniel; Clavelle, Tyler; Strauss, C. Kent; Hilborn, Ray; Melnychuk, Michael C.; Branch, Trevor A.; Gaines, Steven D.; Szuwalski, Cody S.; Cabral, Reniel B.; Rader, Douglas N.; Leland, Amanda

    2016-01-01

    Data from 4,713 fisheries worldwide, representing 78% of global reported fish catch, are analyzed to estimate the status, trends, and benefits of alternative approaches to recovering depleted fisheries. For each fishery, we estimate current biological status and forecast the impacts of contrasting management regimes on catch, profit, and biomass of fish in the sea. We estimate unique recovery targets and trajectories for each fishery, calculate the year-by-year effects of alternative recovery approaches, and model how alternative institutional reforms affect recovery outcomes. Current status is highly heterogeneous—the median fishery is in poor health (overfished, with further overfishing occurring), although 32% of fisheries are in good biological, although not necessarily economic, condition. Our business-as-usual scenario projects further divergence and continued collapse for many of the world’s fisheries. Applying sound management reforms to global fisheries in our dataset could generate annual increases exceeding 16 million metric tons (MMT) in catch, $53 billion in profit, and 619 MMT in biomass relative to business as usual. We also find that, with appropriate reforms, recovery can happen quickly, with the median fishery taking under 10 y to reach recovery targets. Our results show that commonsense reforms to fishery management would dramatically improve overall fish abundance while increasing food security and profits. PMID:27035953

  16. 76 FR 73911 - List of Fisheries for 2012

    Science.gov (United States)

    2011-11-29

    ... 229 List of Fisheries for 2012; Final Rule #0;#0;Federal Register / Vol. 76, No. 229 / Tuesday... Administration 50 CFR Part 229 RIN 0648-BA76 List of Fisheries for 2012 AGENCY: National Marine Fisheries Service...: The National Marine Fisheries Service (NMFS) publishes its final List of Fisheries (LOF) for 2012,...

  17. 50 CFR 665.600 - PRIA bottomfish fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false PRIA bottomfish fisheries. 665.600 Section 665.600 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Pacific Remote Island...

  18. 50 CFR 660.324 - Pacific Coast treaty Indian fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Pacific Coast treaty Indian fisheries. 660.324 Section 660.324 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES OFF WEST COAST STATES West...

  19. 50 CFR 665.640 - PRIA crustacean fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false PRIA crustacean fisheries. 665.640 Section 665.640 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Pacific Remote Island...

  20. 50 CFR 665.240 - Hawaii crustacean fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Hawaii crustacean fisheries. 665.240 Section 665.240 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC...

  1. 50 CFR 665.440 - Mariana crustacean fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Mariana crustacean fisheries. 665.440 Section 665.440 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC...

  2. 50 CFR 665.260 - Hawaii precious coral fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Hawaii precious coral fisheries. 665.260 Section 665.260 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC...

  3. 50 CFR 229.11 - Confidential fisheries data.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Confidential fisheries data. 229.11 Section 229.11 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS AUTHORIZATION FOR COMMERCIAL FISHERIES UNDER THE...

  4. 50 CFR 665.460 - Mariana precious coral fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Mariana precious coral fisheries. 665.460 Section 665.460 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC...

  5. 50 CFR 660.50 - Pacific Coast treaty Indian fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Pacific Coast treaty Indian fisheries. 660.50 Section 660.50 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES OFF WEST COAST STATES West...

  6. 50 CFR 229.8 - Publication of List of Fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Publication of List of Fisheries. 229.8 Section 229.8 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS AUTHORIZATION FOR COMMERCIAL FISHERIES UNDER THE...

  7. 50 CFR 229.5 - Requirements for Category III fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Requirements for Category III fisheries. 229.5 Section 229.5 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS AUTHORIZATION FOR COMMERCIAL FISHERIES...

  8. 50 CFR 665.400 - Mariana bottomfish fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Mariana bottomfish fisheries. 665.400 Section 665.400 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC...

  9. 50 CFR 665.660 - PRIA precious coral fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false PRIA precious coral fisheries. 665.660 Section 665.660 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Pacific...

  10. 50 CFR 665.100 - American Samoa bottomfish fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false American Samoa bottomfish fisheries. 665.100 Section 665.100 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC American...

  11. 50 CFR 665.140 - American Samoa Crustacean Fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false American Samoa Crustacean Fisheries. 665.140 Section 665.140 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC American...

  12. 50 CFR 660.383 - Open access fishery management measures.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Open access fishery management measures... West Coast Groundfish Fisheries § 660.383 Open access fishery management measures. (a) General. Groundfish species taken in open access fisheries will be managed with cumulative trip limits (see...

  13. Vulnerability of the Oceanic Whitetip Shark to Pelagic Longline Fisheries.

    Science.gov (United States)

    Tolotti, Mariana Travassos; Bach, Pascal; Hazin, Fábio; Travassos, Paulo; Dagorn, Laurent

    2015-01-01

    A combination of fisheries dependent and independent data was used to assess the vulnerability of the oceanic whitetip shark to pelagic longline fisheries. The Brazilian tuna longline fleet, operating in the equatorial and southwestern Atlantic, is used as a case study. Fisheries dependent data include information from logbooks (from 1999 to 2011) and on-board observers (2004 to 2010), totaling 65,277 pelagic longline sets. Fisheries independent data were obtained from 8 oceanic whitetip sharks tagged with pop-up satellite archival tags in the area where longline fleet operated. Deployment periods varied from 60 to 178 days between 2010 and 2012. Tagging and pop-up sites were relatively close to each other, although individuals tended to travel long distances before returning to the tagging area. Some degree of site fidelity was observed. High utilization hotspots of tagged sharks fell inside the area under strongest fishing pressure. Despite the small sample size, a positive correlation between tag recorded information and catch data was detected. All sharks exhibited a strong preference for the warm and shallow waters of the mixed layer, spending on average more than 70% of the time above the thermocline and 95% above 120 m. Results indicate that the removal of shallow hooks on longline gear might be an efficient mitigation measure to reduce the bycatch of this pelagic shark species. The work also highlights the potential of tagging experiments to provide essential information for the development of spatio-temporal management measures.

  14. Vulnerability of the Oceanic Whitetip Shark to Pelagic Longline Fisheries

    Science.gov (United States)

    Tolotti, Mariana Travassos; Bach, Pascal; Hazin, Fábio; Travassos, Paulo; Dagorn, Laurent

    2015-01-01

    A combination of fisheries dependent and independent data was used to assess the vulnerability of the oceanic whitetip shark to pelagic longline fisheries. The Brazilian tuna longline fleet, operating in the equatorial and southwestern Atlantic, is used as a case study. Fisheries dependent data include information from logbooks (from 1999 to 2011) and on-board observers (2004 to 2010), totaling 65,277 pelagic longline sets. Fisheries independent data were obtained from 8 oceanic whitetip sharks tagged with pop-up satellite archival tags in the area where longline fleet operated. Deployment periods varied from 60 to 178 days between 2010 and 2012. Tagging and pop-up sites were relatively close to each other, although individuals tended to travel long distances before returning to the tagging area. Some degree of site fidelity was observed. High utilization hotspots of tagged sharks fell inside the area under strongest fishing pressure. Despite the small sample size, a positive correlation between tag recorded information and catch data was detected. All sharks exhibited a strong preference for the warm and shallow waters of the mixed layer, spending on average more than 70% of the time above the thermocline and 95% above 120 m. Results indicate that the removal of shallow hooks on longline gear might be an efficient mitigation measure to reduce the bycatch of this pelagic shark species. The work also highlights the potential of tagging experiments to provide essential information for the development of spatio-temporal management measures. PMID:26492091

  15. Vulnerability of the Oceanic Whitetip Shark to Pelagic Longline Fisheries.

    Directory of Open Access Journals (Sweden)

    Mariana Travassos Tolotti

    Full Text Available A combination of fisheries dependent and independent data was used to assess the vulnerability of the oceanic whitetip shark to pelagic longline fisheries. The Brazilian tuna longline fleet, operating in the equatorial and southwestern Atlantic, is used as a case study. Fisheries dependent data include information from logbooks (from 1999 to 2011 and on-board observers (2004 to 2010, totaling 65,277 pelagic longline sets. Fisheries independent data were obtained from 8 oceanic whitetip sharks tagged with pop-up satellite archival tags in the area where longline fleet operated. Deployment periods varied from 60 to 178 days between 2010 and 2012. Tagging and pop-up sites were relatively close to each other, although individuals tended to travel long distances before returning to the tagging area. Some degree of site fidelity was observed. High utilization hotspots of tagged sharks fell inside the area under strongest fishing pressure. Despite the small sample size, a positive correlation between tag recorded information and catch data was detected. All sharks exhibited a strong preference for the warm and shallow waters of the mixed layer, spending on average more than 70% of the time above the thermocline and 95% above 120 m. Results indicate that the removal of shallow hooks on longline gear might be an efficient mitigation measure to reduce the bycatch of this pelagic shark species. The work also highlights the potential of tagging experiments to provide essential information for the development of spatio-temporal management measures.

  16. Challenges for Managing Fisheries on Diverse Coral Reefs

    Directory of Open Access Journals (Sweden)

    Douglas Fenner

    2012-03-01

    Full Text Available Widespread coral reef decline has included the decline of reef fish populations, and the subsistence and artisanal fisheries that depend on them. Overfishing and destructive fishing have been identified as the greatest local threats to coral reefs, but the greatest future threats are acidification and increases in mass coral bleaching caused by global warming. Some reefs have shifted from dominance by corals to macroalgae, in what are called “phase shifts”. Depletion of herbivores including fishes has been identified as a contributor to such phase shifts, though nutrients are also involved in complex interactions with herbivory and competition. The depletion of herbivorous fishes implies a reduction of the resilience of coral reefs to the looming threat of mass coral mortality from bleaching, since mass coral deaths are likely to be followed by mass macroalgal blooms on the newly exposed dead substrates. Conventional stock assessment of each fish species would be the preferred option for understanding the status of the reef fishes, but this is far too expensive to be practical because of the high diversity of the fishery and poverty where most reefs are located. In addition, stock assessment models and fisheries in general assume density dependent populations, but a key prediction that stocks recover from fishing is not always confirmed. Catch Per Unit Effort (CPUE has far too many weaknesses to be a useful method. The ratio of catch to stock and the proportion of catch that is mature depend on fish catch data, and are heavily biased toward stocks that are in good condition and incapable of finding species that are in the worst condition. Near-pristine reefs give us a reality check about just how much we have lost. Common fisheries management tools that control effort or catch are often prohibitively difficult to enforce for most coral reefs except in developed countries. Ecosystem-based management requires management of impacts of fishing

  17. Market-Based Fisheries Management

    DEFF Research Database (Denmark)

    Høst, Jeppe Engset

    This book reveals how a privatization of fish resources has paved the way for a wide-reaching concentration and change in ownership. It is a thought-provoking contribution to the debate on the future of European fisheries and the possible solutions to overfishing in Europe. Readers will discover...... a timely, critical insight into the social, cultural and economic aspects and consequences of market-based fisheries management. The privatization of fish quotas in Denmark represents one of the most far-reaching and comprehensive privatization schemes of its kind and has been widely promoted as a market......-based system with innovative social safeguards. This work critically examines this privatization of fish resources, combining quantitative and qualitative material to provide new understanding of fish quotas and their social value. Scholars with an interest in privatization and the socio-economic aspects...

  18. 75 FR 41996 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Pollock Catch Limit...

    Science.gov (United States)

    2010-07-20

    ... United States; Northeast Multispecies Fishery; Pollock Catch Limit Revisions AGENCY: National Marine... associated increases in pollock catch limits under the Northeast (NE) Multispecies Fishery Management Plan..., including Overfishing Levels (OFLs), Acceptable Biological Catches (ABCs), Annual Catch Limits (ACLs),...

  19. 75 FR 22070 - Pacific Halibut Fisheries; Guided Sport Charter Vessel Fishery for Halibut; Recordkeeping and...

    Science.gov (United States)

    2010-04-27

    ... requirements for the Pacific halibut guided sport fishery in International Pacific Halibut Commission...; Guided Sport Charter Vessel Fishery for Halibut; Recordkeeping and Reporting AGENCY: National Marine... would revise federal requirements regarding the location and time period for submission of Alaska...

  20. Follow that fish: Uncovering the hidden blue economy in coral reef fisheries.

    Science.gov (United States)

    Grafeld, Shanna; Oleson, Kirsten L L; Teneva, Lida; Kittinger, John N

    2017-01-01

    Despite their importance for human well-being, nearshore fisheries are often data poor, undervalued, and underappreciated in policy and development programs. We assess the value chain for nearshore Hawaiian coral reef fisheries, mapping post-catch distribution and disposition, and quantifying associated monetary, food security, and cultural values. We estimate that the total annual value of the nearshore fishery in Hawai'i is $10.3-$16.4 million, composed of non-commercial ($7.2-$12.9 million) and commercial ($2.97 million licensed + $148,500-$445,500 unlicensed) catch. Hawaii's nearshore fisheries provide >7 million meals annually, with most (>5 million) from the non-commercial sector. Over a third (36%) of meals were planktivores, 26% piscivores, 21% primary consumers, and 18% secondary consumers. Only 62% of licensed commercial catch is accounted for in purchase reports, leaving 38% of landings unreported in sales. Value chains are complex, with major buyers for the commercial fishery including grocery stores (66%), retailers (19%), wholesalers (14%), and restaurants (social cohesion. These small-scale coral reef fisheries provide large-scale benefits to the economy, food security, and cultural practices of Hawai'i, underscoring the need for sustainable management. This research highlights the value of information on the value chain for small-scale production systems, making the hidden economy of these fisheries visible and illuminating a range of conservation interventions applicable to Hawai'i and beyond.

  1. Management Pollution Model for Sustainability Tourism and Fisheries in Coastal Areas of Makassar City

    OpenAIRE

    Hamzah

    2012-01-01

    HAMZAH. Management Pollution Model for Sustainability Tourism and Fisheries in Coastal Areas of Makassar City. Under direction of ACHMAD FAHRUDIN, HEFNI EFFENDI, ISMUDI MUCHSIN Coastal areas of Makassar have a rapid development growth deployed with various activities including tourism and fisheries. Such resource utilizations have impacted coastal environment particularly its water quality. This research is intended to assess bio-physical condition, water quality, pollution loading, poll...

  2. Arctic marine fishes and their fisheries in light of global change

    OpenAIRE

    Jørgen S. Christiansen; Mecklenburg, Catherine W; Karamushko, Oleg V

    2013-01-01

    In light of ocean warming and loss of Arctic sea ice, harvested marine fishes of boreal origin (and their fisheries) move poleward into yet unexploited parts of the Arctic seas. Industrial fisheries, already in place on many Arctic shelves, will radically affect the local fish species as they turn up as unprecedented bycatch. Arctic marine fishes are indispensable to ecosystem structuring and functioning, but they are still beyond credible assessment due to lack of basic biological data. The ...

  3. Small-scale fisheries in Greenlandic planning

    DEFF Research Database (Denmark)

    Jacobsen, Rikke Becker

    2013-01-01

    This article analyses an ongoing planning process in Greenlandic fisheries governance aiming to reform the coastal Greenland halibut fishery. It examines the way certain truths about this fishery and the need for reform are produced up to and in the final policy document ‘regulation concerning...... governmentality: The process whereby a selected fishery becomes subjected to planned out-phasing through a combined construction of fleet and human identity....... the coastal fishery for Greenland halibut’. Findings highlight the way the small-scale Greenland halibut fishery system becomes a particular governance problem with respect to particular contextual meanings of sustainability and long-term planning. The article then examines whether this governance problem...

  4. Ocean robotics in support of fisheries research and management

    CSIR Research Space (South Africa)

    Swart, S

    2016-12-01

    Full Text Available successfully implement and demonstrate an autonomous wave glider, fitted with a hydro-acoustic sensor and compare the data to a collocated ‘traditional’ ship-based acoustics survey. In the future these autonomous systems approaches could be seen as a means...

  5. Characteristics of Beach Seine Fishery of East Java: Facing Ministerial Decree of Marine Affairs and Fisheries No. 2/2015

    Directory of Open Access Journals (Sweden)

    Dewa Gede Raka Wiadnya

    2017-07-01

    Full Text Available Catch biomass and time-trend perception of Beach seine fishery were studied during 2015, from four different sites in East Java: Padikde Madura, Santan Island Banyuwangi, Prigi Beach Trenggalek, and Dangkal Beach Pacitan. The study aimed to assess the impact of recently Ministerial Decree (No. 2/2015 on this particular fishery. Catch biomass was analyzed based on swept area method. Time trend perception was traced back from fishermen in relation to reduced catch biomass, catch size, habitat degradation, and income contribution from the fishery. The results showed that Beach Seines in East Java are considerably subsistence. It swept fixed-bottom habitats of 1–9 ha. Average catch biomass for all sites was 15±19.4 kg trip-1. With low price of fish catch, fishermen cannot place down their family income solely from this livelihood. Beach seine is more as to maintain tradition of subsistence. Fishermen clearly observed the reduced in catch biomass and catch size compared to what it used to be (±30 years ago. With very low contribution to total catch in the region, negligible impact to habitat degradation, and consumed no fuel subsidy, it is no real reason to include this gear in general ban through Ministerial Decree of Marine Affairs and Fisheries.

  6. Species distribution modelling in fisheries science

    OpenAIRE

    Paradinas, Iosu

    2017-01-01

    Latest fisheries directives propose adopting an ecosystem approach to manage fisheries \\citep{FAO-EAFM}. Such an approach aims to protect important ecosystems based on the principle that healthy ecosystems produce more and thus enhance sustainability. Unfortunately, quantifying the importance of an ecosystem is a difficult task to do due the immense number of interactions involved in marine systems. This PhD dissertation relies on the fact that good fisheries distribution maps could play ...

  7. Freedom and poverty in the fishery commons

    OpenAIRE

    Svein Jentoft; Paul Onyango; Mohammad Mahmudul Islam

    2010-01-01

    Abstract In fisheries, alleviating poverty sometimes requires strategies that are inherently in conflict. When aiming to develop a fishery as a means to reduce poverty, its common pool resource basis might be undermined, resulting in greater poverty. But poverty in fisheries is also linked to, or a part of deeper social issues and processes, for instance, the marginalization and exclusion of certain communities. Poverty also has many factors— income, health, literacy, gender, power, sec...

  8. The fishery performance indicators: a management tool for triple bottom line outcomes.

    Directory of Open Access Journals (Sweden)

    James L Anderson

    Full Text Available Pursuit of the triple bottom line of economic, community and ecological sustainability has increased the complexity of fishery management; fisheries assessments require new types of data and analysis to guide science-based policy in addition to traditional biological information and modeling. We introduce the Fishery Performance Indicators (FPIs, a broadly applicable and flexible tool for assessing performance in individual fisheries, and for establishing cross-sectional links between enabling conditions, management strategies and triple bottom line outcomes. Conceptually separating measures of performance, the FPIs use 68 individual outcome metrics--coded on a 1 to 5 scale based on expert assessment to facilitate application to data poor fisheries and sectors--that can be partitioned into sector-based or triple-bottom-line sustainability-based interpretative indicators. Variation among outcomes is explained with 54 similarly structured metrics of inputs, management approaches and enabling conditions. Using 61 initial fishery case studies drawn from industrial and developing countries around the world, we demonstrate the inferential importance of tracking economic and community outcomes, in addition to resource status.

  9. The fishery performance indicators: a management tool for triple bottom line outcomes.

    Science.gov (United States)

    Anderson, James L; Anderson, Christopher M; Chu, Jingjie; Meredith, Jennifer; Asche, Frank; Sylvia, Gil; Smith, Martin D; Anggraeni, Dessy; Arthur, Robert; Guttormsen, Atle; McCluney, Jessica K; Ward, Tim; Akpalu, Wisdom; Eggert, Håkan; Flores, Jimely; Freeman, Matthew A; Holland, Daniel S; Knapp, Gunnar; Kobayashi, Mimako; Larkin, Sherry; MacLauchlin, Kari; Schnier, Kurt; Soboil, Mark; Tveteras, Sigbjorn; Uchida, Hirotsugu; Valderrama, Diego

    2015-01-01

    Pursuit of the triple bottom line of economic, community and ecological sustainability has increased the complexity of fishery management; fisheries assessments require new types of data and analysis to guide science-based policy in addition to traditional biological information and modeling. We introduce the Fishery Performance Indicators (FPIs), a broadly applicable and flexible tool for assessing performance in individual fisheries, and for establishing cross-sectional links between enabling conditions, management strategies and triple bottom line outcomes. Conceptually separating measures of performance, the FPIs use 68 individual outcome metrics--coded on a 1 to 5 scale based on expert assessment to facilitate application to data poor fisheries and sectors--that can be partitioned into sector-based or triple-bottom-line sustainability-based interpretative indicators. Variation among outcomes is explained with 54 similarly structured metrics of inputs, management approaches and enabling conditions. Using 61 initial fishery case studies drawn from industrial and developing countries around the world, we demonstrate the inferential importance of tracking economic and community outcomes, in addition to resource status.

  10. 78 FR 61828 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Framework Adjustment 2 and...

    Science.gov (United States)

    2013-10-04

    ..., which would maintain the status quo of 106,000 mt ABC and 91,200 mt ACL for the next 3 years. Response... Amendment 15 and Framework Adjustment 22 to the Scallop Fishery Management Plan (76 FR 43746, July 21, 2011... Management Plan (Framework 2) and the 2013-2015 fishery specifications for the Atlantic herring fishery...

  11. 76 FR 19929 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2011-04-11

    ... combines the overfishing threshold from the status quo overfishing definition for open areas with a time... Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Atlantic Sea Scallop Fishery; Amendment 15 to the Atlantic Sea Scallop Fishery Management Plan AGENCY: National...

  12. 78 FR 63892 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2013-10-25

    ... catch limits for several stocks managed under the Northeast Multispecies Fishery Management Plan. The...) stocks as part of Framework Adjustment 50 to the NE Multispecies Fishery Management Plan (FMP) (78 FR... Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Monkfish...

  13. 76 FR 23940 - Fisheries of the Northeastern United States; Atlantic Sea Scallop Fishery; Framework Adjustment 22

    Science.gov (United States)

    2011-04-29

    ... (LAGC) fleets; open area days-at-sea (DAS) and Sea Scallop Access Area (access area) trip allocations... United States; Atlantic Sea Scallop Fishery; Framework Adjustment 22 AGENCY: National Marine Fisheries... 22) to the Atlantic Sea Scallop Fishery Management Plan (FMP), which was developed and adopted by...

  14. 75 FR 48874 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Specifications

    Science.gov (United States)

    2010-08-12

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-AY14 Fisheries of the Northeastern United States; Atlantic Herring Fishery; Specifications AGENCY: National Marine Fisheries Service (NMFS... announces final specifications for the 2010-2012 fishing years for the Atlantic herring (herring)...

  15. 76 FR 71501 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery

    Science.gov (United States)

    2011-11-18

    ... Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service... for comments. SUMMARY: NMFS proposes new Federal American lobster regulations that would limit entry into the lobster trap fishery in Lobster Conservation Management Area 1 (Federal inshore waters-Gulf...

  16. 77 FR 15973 - Fisheries Off West Coast States; Highly Migratory Species Fisheries; Swordfish Retention Limits

    Science.gov (United States)

    2012-03-19

    ... States; Highly Migratory Species Fisheries; Swordfish Retention Limits AGENCY: National Marine Fisheries...) to modify retention limits for swordfish harvested in the U.S. West Coast-based deep-set tuna... limits of swordfish captured in the DSLL fishery as follows: if a vessel without an observer onboard...

  17. Ecosystem services and cooperative fisheries research to address a complex fishery problem

    Science.gov (United States)

    The St. Louis River represents a complex fishery management problem. Current fishery management goals have to be developed taking into account bi-state commercial, subsistence and recreational fisheries which are valued for different characteristics by a wide range of anglers, as...

  18. 78 FR 59916 - Fisheries of the South Atlantic; South Atlantic Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-09-30

    ... Atlantic Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries Service (NMFS.... SUMMARY: The South Atlantic Fishery Management Council (SAFMC) will hold a meeting of its Scientific and... 24, 2013. ADDRESSES: ] Meeting address: The meeting will be held at the Crowne Plaza Airport Hotel...

  19. 78 FR 56641 - Fisheries Off West Coast States; Pacific Coast Groundfish Fishery Management Plan; Commercial...

    Science.gov (United States)

    2013-09-13

    ... States; Pacific Coast Groundfish Fishery Management Plan; Commercial Groundfish Fishery Management... Pacific Coast Groundfish Fishery Management Plan (FMP) by liberalizing RCA boundaries in order to improve... specifications and management measures in a proposed and final rule, 77 FR 67974, November 14, 2012 and 78 FR...

  20. 78 FR 68764 - Fisheries Off West Coast States; Pacific Coast Groundfish Fishery Management Plan; Commercial...

    Science.gov (United States)

    2013-11-15

    ... States; Pacific Coast Groundfish Fishery Management Plan; Commercial, Limited Entry Pacific Coast... fixed gear sectors managed under the Pacific Coast Groundfish Fishery Management Plan (FMP). This action... catcher/processor trawl fleets (whiting only). Since that time, the Pacific Fishery Management...

  1. 77 FR 74159 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-12-13

    ... Adjustment 7, are available from: Dr. Christopher M. Moore, Executive Director, Mid-Atlantic Fishery... Mackerel, Squid, and Butterfish (MSB) Fishery Management Plan (FMP) (75 FR 11441, March 11, 2010) as a...: December 10, 2012. Alan Risenhoover, Director, Office of Sustainable Fisheries, performing the...

  2. 76 FR 43745 - Magnuson-Stevens Fishery Conservation and Management Act (MSA) Provisions; Fisheries of the...

    Science.gov (United States)

    2011-07-21

    ... Part 648 Magnuson-Stevens Fishery Conservation and Management Act (MSA) Provisions; Fisheries of the... Administration 50 CFR Part 648 RIN 0648-BA71 Magnuson-Stevens Fishery Conservation and Management Act (MSA... with requirements of the MSA as reauthorized in 2007. Amendment 15 includes additional...

  3. The Southeast Fisheries Science Center (SEFSC)

    Data.gov (United States)

    Federal Laboratory Consortium — The Southeast Fisheries Science Center (SEFSC) is headquartered in Miami, FL. The SEFSC is responsible for scientific research on living marine resources that occupy...

  4. Emerging issues and methodological advances in fisheries reproductive biology

    DEFF Research Database (Denmark)

    Lowerre-Barbieri, Susan K.; Brown-Peterson, Nancy J.; Murua, Hilario;

    2011-01-01

    Although incorporating detailed reproductive data into all stock assessments is not a practical goal, the need to understand how reproductive biology affects population productivity is being increasingly recognized.More research focused on reproductive biology—coupled with a shift towards...... development, which is most accurately evaluated with histology. This special section of Marine and Coastal Fisheries contains contributions from a workshop on the gonadal histology of fishes that was held in Cadiz, Spain, during June 2009. These papers cover a wide range of species and reproductive topics...... a resilience perspective in fisheries science—is resulting in challenges to many long-held assumptions; the emergence of important new issues; and identification of the need to improve data and methods used in reproductive studies. Typically, data for reproductive studies are based on an assessment of gonadal...

  5. 78 FR 59917 - Caribbean Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-09-30

    ... Meeting AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration... English. However, simultaneous interpretation (English-Spanish) will be provided. Fishers and other... Fisheries, National Marine Fisheries Service. BILLING CODE 3510-22-P...

  6. 76 FR 49452 - Caribbean Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-08-10

    ... Meeting AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration... English. However, simultaneous interpretation (English-Spanish) will be provided. Fishers and other..., Acting Director, Office of Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE...

  7. 77 FR 63296 - Fisheries of the Northeast Region

    Science.gov (United States)

    2012-10-16

    ... National Oceanic and Atmospheric Administration RIN 0648-XC159 Fisheries of the Northeast Region AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce... appropriate fishery management council (Council) whenever it determines that overfishing is occurring, a...

  8. 78 FR 64480 - Fisheries of the Northeast Region

    Science.gov (United States)

    2013-10-29

    ... National Oceanic and Atmospheric Administration RIN 0648-XC866 Fisheries of the Northeast Region AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce... overfished condition. NMFS, on behalf of the Secretary, notifies the appropriate fishery management...

  9. 78 FR 31519 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-05-24

    ... England Fishery Management Council; Public Meeting AGENCY: National Marine Fisheries Service (NMFS...: The New England Fishery Management Council's (Council) Groundfish Oversight Committee will meet to... held at the Providence Biltmore Hotel, 11 Dorrance Street, Providence, RI 02903; telephone: (401) 421...

  10. 50 CFR 660.211 - Fixed gear fishery-definitions.

    Science.gov (United States)

    2010-10-01

    ... are found at § 660.11, subpart C. Daily Trip Limit (DTL) Fishery means a sablefish fishery that occurs... tier limit and when they are not eligible to fish in the DTL fishery. Sablefish primary season...

  11. 78 FR 928 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-01-07

    ... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XC428 New England Fishery Management Council... CONTACT: Paul J. Howard, Executive Director, New England Fishery Management Council; telephone: (978)...

  12. 76 FR 70420 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-11-14

    ... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XA815 New England Fishery Management Council... CONTACT: Paul J. Howard, Executive Director, New England Fishery Management Council; telephone: (978)...

  13. 75 FR 63146 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2010-10-14

    ... Administration (NOAA), Commerce. ACTION: Notice of a public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XZ64 New England Fishery Management Council.... Howard, Executive Director, New England Fishery Management Council; telephone: (978)...

  14. 76 FR 41216 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-07-13

    ... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XA561 New England Fishery Management Council... New England Fishery Management Council, 50 Water Street, Mill 2, Newburyport, MA 01950;...

  15. 77 FR 27440 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2012-05-10

    ... National Oceanic and Atmospheric Administration New England Fishery Management Council; Public Meeting...), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management Council (Council) is... INFORMATION CONTACT: Paul J. Howard, Executive Director, New England Fishery Management Council;...

  16. 75 FR 49466 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2010-08-13

    ... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XY17 New England Fishery Management Council... INFORMATION CONTACT: Paul J. Howard, Executive Director, New England Fishery Management Council;...

  17. 78 FR 53729 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-08-30

    ... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XC840 New England Fishery Management Council... INFORMATION CONTACT: Thomas A. Nies, Executive Director, New England Fishery Management Council;...

  18. 78 FR 62587 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-10-22

    ... Administration (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XC923 New England Fishery Management Council...: Thomas A. Nies, Executive Director, New England Fishery Management Council; telephone: (978)...

  19. 78 FR 48860 - New England Fishery Management Council; Public Meetings

    Science.gov (United States)

    2013-08-12

    ... Administration (NOAA), Commerce. ACTION: Notice; public meetings. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XC802 New England Fishery Management Council...: Thomas A. Nies, Executive Director, ] New England Fishery Management Council; telephone: (978)...

  20. 76 FR 64073 - New England Fishery Management Council; Public Meetings

    Science.gov (United States)

    2011-10-17

    ... Administration (NOAA), Commerce. ACTION: Notice; public meetings. SUMMARY: The New England Fishery Management... National Oceanic and Atmospheric Administration RIN 0648-XA763 New England Fishery Management Council... locations, see SUPPLEMENTARY INFORMATION. Council address: New England Fishery Management Council, 50...