WorldWideScience

Sample records for catch share fisheries

  1. Social Cultural Data - Social Impacts of Catch Shares in the West Coast Groundfish Fishery

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Catch shares are one method of catch allocation utilized by fisheries managers in the United States West Coast groundfish fishery. Catch share management results in...

  2. 78 FR 75843 - Pacific Halibut Fisheries; Catch Sharing Plan for Guided Sport and Commercial Fisheries in Alaska

    Science.gov (United States)

    2013-12-12

    ... opening for the sport fishing season. However, implementation of the annual management measures in March... annual allocations and guided sport catch limits are adopted by the Commission as annual management... Part 902 50 CFR Parts 300 and 679 Pacific Halibut Fisheries; Catch Sharing Plan for Guided Sport...

  3. 76 FR 2871 - Pacific Halibut Fisheries; Catch Sharing Plan

    Science.gov (United States)

    2011-01-18

    ... IPHC. This includes Tribal regulations and the sport fishery allocations and management measures for...://www.nwr.noaa.gov/Groundfish-Halibut/Pacific-Halibut/Index.cfm . Proposed 2011 Sport Fishery Management Measures NMFS is proposing sport fishery management measures that are necessary to implement the Plan...

  4. 75 FR 5745 - Pacific Halibut Fisheries; Catch Sharing Plan

    Science.gov (United States)

    2010-02-04

    ... IPHC. This includes tribal regulations and the sport fishery allocations and management measures for.... Proposed 2010 Sport Fishery Management Measures NMFS is proposing sport fishery management measures that... domestic management measures, ``Sport Fishing for Halibut,'' paragraph 1(a)-(b) will be updated with...

  5. 75 FR 13024 - Pacific Halibut Fisheries; Catch Sharing Plan

    Science.gov (United States)

    2010-03-18

    ... halibut fishery. Changes in subsistence and sport halibut fishery management measures are codified at 50... sport fishing season regulations. This final rule publishes the Annual Management Measures for the 2010... Commission (IPHC), publishes annual management measures promulgated as regulations by the IPHC and...

  6. 76 FR 14300 - Pacific Halibut Fisheries; Catch Sharing Plan

    Science.gov (United States)

    2011-03-16

    ... 2011. The changes to the previous IPHC regulations (75 FR 13024, March 19, 2010) include: 1. New... offloaded. Non-substantive changes to the previous IPHC regulations include minor editorial and grammatical... changes to the CSP and recreational management measures for Area 2A (76 FR 2871). The final catch...

  7. 76 FR 44155 - Pacific Halibut Fisheries; Catch Sharing Plan for Guided Sport and Commercial Fisheries in Alaska

    Science.gov (United States)

    2011-07-22

    ... Contents I. Management of the Halibut Fisheries II. History of Management in the Guided Sport Halibut... IPHC regulations were published March 16, 2011, at 76 FR 14300. IPHC regulations affecting sport... halibut fishery decreased. II. History of Management in the Guided Sport Halibut Fisheries Until...

  8. 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.

  9. Catch reconstructions reveal that global marine fisheries catches are higher than reported and declining.

    Science.gov (United States)

    Pauly, Daniel; Zeller, Dirk

    2016-01-01

    Fisheries data assembled by the Food and Agriculture Organization (FAO) suggest that global marine fisheries catches increased to 86 million tonnes in 1996, then slightly declined. Here, using a decade-long multinational 'catch reconstruction' project covering the Exclusive Economic Zones of the world's maritime countries and the High Seas from 1950 to 2010, and accounting for all fisheries, we identify catch trajectories differing considerably from the national data submitted to the FAO. We suggest that catch actually peaked at 130 million tonnes, and has been declining much more strongly since. This decline in reconstructed catches reflects declines in industrial catches and to a smaller extent declining discards, despite industrial fishing having expanded from industrialized countries to the waters of developing countries. The differing trajectories documented here suggest a need for improved monitoring of all fisheries, including often neglected small-scale fisheries, and illegal and other problematic fisheries, as well as discarded bycatch.

  10. 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...

  11. Signature of ocean warming in global fisheries catch.

    Science.gov (United States)

    Cheung, William W L; Watson, Reg; Pauly, Daniel

    2013-05-16

    Marine fishes and invertebrates respond to ocean warming through distribution shifts, generally to higher latitudes and deeper waters. Consequently, fisheries should be affected by 'tropicalization' of catch (increasing dominance of warm-water species). However, a signature of such climate-change effects on global fisheries catch has so far not been detected. Here we report such an index, the mean temperature of the catch (MTC), that is calculated from the average inferred temperature preference of exploited species weighted by their annual catch. Our results show that, after accounting for the effects of fishing and large-scale oceanographic variability, global MTC increased at a rate of 0.19 degrees Celsius per decade between 1970 and 2006, and non-tropical MTC increased at a rate of 0.23 degrees Celsius per decade. In tropical areas, MTC increased initially because of the reduction in the proportion of subtropical species catches, but subsequently stabilized as scope for further tropicalization of communities became limited. Changes in MTC in 52 large marine ecosystems, covering the majority of the world's coastal and shelf areas, are significantly and positively related to regional changes in sea surface temperature. This study shows that ocean warming has already affected global fisheries in the past four decades, highlighting the immediate need to develop adaptation plans to minimize the effect of such warming on the economy and food security of coastal communities, particularly in tropical regions.

  12. Catch, effort and bycatch of longline fishery in central Peru

    Directory of Open Access Journals (Sweden)

    Liliana Ayala

    2014-12-01

    Full Text Available The aims of this study is to report some characteristics of fishing trips, effort, catches, fishing areas and bycatch through observations on board and logbooks. 85% of sets were in the first 574 Km of distance from the coast (309 nautical miles. Farthest set was located at 1320 Km (712 nautical miles. A total of 382000 hooks were used to catch Mahi mahi, in 224 sets and 29 fishing trips, 94.6% of catch was Mahi mahi, 2.7% blue shark (Prionace glauca y 1,3% mako shark (Isurus oxyrinchus. Also, 103790 hooks were used to catch sharks, in 109 sets y 12 trips, 81.9% of catch was blue sharks and 16.8% mako sharks. Catch per Unit of Effort (CPUE for Mahi mahi shows significative difference among seasons; with a peak from November to January. CPUE for shark shows significative difference among seasons, with peaks in September and October. The Green turtle Chelonia mydas agassizii was the most caugth species and two of three were juveniles. All Loggerhead turtles, Caretta caretta, caught were juveniles. A petrel is reported as bycatch and, probably, mammal bycatch is scarce. Considering the huge effort of this fishery, it is important to monitor it and establish management actions.

  13. 78 FR 21071 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2013-04-09

    ...-ACL is set aside for research (75 FR 48874, August 12, 2010). The regulations at Sec. 648.201 require... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for Management..., acceptable biological catch, annual catch limit (ACL), optimum yield, domestic harvest and processing,...

  14. 77 FR 10668 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2012-02-23

    ... 22,146 mt, and 0 mt of the sub-ACL is set aside for research (75 FR 48874, August 12, 2010). Section... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for Management... the overfishing limit, acceptable biological catch, annual catch limit (ACL), optimum yield,...

  15. 77 FR 61299 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2012-10-09

    ... research in the 2010-2012 specifications (75 FR 48874, August 12, 2010). Section 648.201 requires the... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for Management... specification of the overfishing ] limit, acceptable biological catch, annual catch limit (ACL), optimum...

  16. 76 FR 66654 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2011-10-27

    ... 1A is 26,546 mt, and 0 mt of the sub-ACL is set aside for research (75 FR 48874, August 12, 2010... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for Management... specification of the overfishing limit, acceptable biological catch, annual catch limit (ACL), optimum...

  17. Paper Fish and Policy Conflict: Catch Shares and Ecosystem-Based Management in Maine's Groundfishery

    Directory of Open Access Journals (Sweden)

    Jennifer F. Brewer

    2011-03-01

    Full Text Available The National Oceanic and Atmospheric Administration professes support for ecosystem-based fisheries management, as mandated by Congress in the Fishery Conservation and Management Act, and as endorsed by the Obama Administration's national ocean policy. Nonetheless, driving agency policies, including catch shares and fishing quotas, focus principally on individual species, diverting attention from ecosystem considerations such as habitat, migratory patterns, trophic relationships, fishing gear, and firm-level decision making. Environmental non-governmental organization (ENGO agendas manifest similar inconsistencies. A case study of Maine's groundfishery demonstrates implications of this policy conflict at the local level. There, multigenerational fishing villages have historically pursued diversified and adaptive livelihood strategies, supported by local ecological knowledge. This tradition is increasingly eroded by regulatory constraints, including catch shares. Field observation, interviews, survey data, and archival review reveal that industry-supported, ecosystem-focused proposals have been rejected by the New England Fishery Management Council, despite the apparent failure of single-species approaches to sustain fish populations, fished ecosystems, and fishing-dependent communities. The creation of groundfishery catch share sectors is likely to perpetuate industry consolidation and political entrenchment under more mobile capital, following precedent set by days-at-sea, and making area protections and gear restrictions less likely. Pending marine spatial planning efforts could enhance social–ecological resilience by creating new opportunities for transdisciplinary decision support, and broader public participation and accountability.

  18. Rapid shifts in catch composition in the artisanal Red Sea reef fisheries of Eritrea

    NARCIS (Netherlands)

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

    2007-01-01

    Shifts in catch composition were registered in the Eritrean artisanal fisheries, which were launched into a renewed development after the end of the independence war in 1991. Our analysis of catch and effort data showed that total fishing effort as well as total annual catch increased more than two-

  19. 76 FR 21705 - Fisheries of the Exclusive Economic Zone Off Alaska; Catch Accounting in the Longline Catcher...

    Science.gov (United States)

    2011-04-18

    ... Alaska; Catch Accounting in the Longline Catcher/Processor Pacific Cod Fishery AGENCY: National Marine... Islands to support different catch accounting methods for Pacific cod catch. NMFS is considering...

  20. 76 FR 61061 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2011-10-03

    ... is 38,146 mt and 0 mt of the sub-ACL is set aside for research (75 FR 48874, August 12, 2010). The... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for Management... day until January 1, 2012, when the 2012 sub-ACL (annual catch limit) for Area 3 becomes...

  1. Artisanal Green Turtle, Chelonia mydas, fishery of Caribbean Nicaragua: I. Catch rates and trends, 1991-2011.

    Directory of Open Access Journals (Sweden)

    Cynthia J Lagueux

    Full Text Available This is the first assessment of catch rates for the legal, artisanal green turtle, Chelonia mydas, fishery in Caribbean Nicaragua. Data were collected by community members, monitoring up to 14 landing sites from 1991 to 2011. We examined take levels, and temporal and spatial variability in catch rates for the overall fishery, by region, and community using General Additive Mixed Models (GAMMs. More than 171,556 green turtles were killed during the period, with a mean estimated minimum 8,169±2,182 annually. There was a statistically significant decline in catch rates overall. Catch rates peaked in 1997 and 2002, followed by a downward trend, particularly from mid-2008 to the end of the study period. Similar downward trends were evident in both study regions. Community specific catch rate trends also indicated declines with decreases ranging from 21% to 90%. Decrease in catch rates in Nicaragua is cause for concern even though the principal source rookery at Tortuguero, Costa Rica, shows an increase in nesting activity. Explanations for the apparent discrepancy between the increasing trend at Tortuguero and decreasing catch rate trends in Nicaragua include: i an increase in reproductive output, ii insufficient time has passed to observe the impact of the fishery on the rookery due to a time lag, iii changes in other segments of the population have not been detected since only nesting activity is monitored, iv the expansive northern Nicaragua foraging ground may provide a refuge for a sufficient portion of the Tortuguero rookery, and/or v a larger than expected contribution of non-Tortuguero rookeries occurring in Nicaragua turtle fishing areas. Our results highlight the need for close monitoring of rookeries and in-water aggregations in the Caribbean. Where consumptive use still occurs, nations sharing this resource should implement scientifically based limits on exploitation to ensure sustainability and mitigate impacts to regional population

  2. The South China Sea: analyzing fisheries catch data in an ecosystem context

    OpenAIRE

    Christensen, V.; Pauly, D

    1991-01-01

    The South China Sea is an important fishing area with an annual harvest of some 5 million tonnes, or 10% of the catches jointly taken by the developing nations of the world. Details are given of a model of the area describing fisheries catches and biological interactions. The area, viewed as a large marine ecosystem, was divided into 10 subsystems; each subsystem was then linked with adjacent subsystems by predatory links, and detritus flows. An analysis was then made of catch statistics for ...

  3. From bonito to anchovy: a reconstruction of Turkey’s marine fisheries catches (1950-2010

    Directory of Open Access Journals (Sweden)

    A. ULMAN

    2013-07-01

    Full Text Available Turkey’s marine fisheries catches were estimated for the 1950-2010 time period using a reconstruction approach, which estimated all fisheries removals, including unreported landings, recreational landings and discards.  We added these estimates to the ‘official’ data, as reported in TURKSTAT, which are also available from the United Nation’s Food and Agriculture Organization (FAO.  The total reconstructed catch for the 1950-2010 time period (inclusive of the reported data is approximately 32 million t, or 74% more than the 18.4 million t of reported data. This added approximately 13.6 million t to the reported data, consisting of 6.9 million t of unreported landings, 2.6 million t of discards, 2.4 million t of recreational catches, and 1.7 million t of subsistence catches.  In 2010, total reported marine landings for Turkey were 445,680 t and the total reconstructed catch was 763,760 t, or 73% more than the reported data.   The main unreported taxon by tonnage was European anchovy (Engraulis encrasicolus due to its sheer high proportion of catch.  The major reasons for underreporting include a general distrust fishers have towards the taxing system combined with inefficient fisheries monitoring and surveillance capabilities.  Accounting for all fisheries components is crucial in understanding the development of fisheries resources, improving management, and reducing threats to the domestic food security of Turkey.

  4. Conched out: Total reconstructed fisheries catches for the Turks and Caicos Islands uncover unsustainable resource usage

    Directory of Open Access Journals (Sweden)

    Aylin eUlman

    2016-05-01

    Full Text Available The Turks and Caicos Islands’ total marine fisheries catches were estimated for 1950-2012 using a catch reconstruction approach, estimating all removals, including reported catch destined for export, and unreported domestic artisanal and subsistence catches. Total reconstructed catch for the period is approximately 2.8 times that reported by Turks and Caicos to the FAO, and 86% higher than the export-adjusted national reported baseline. The pattern of total catches (strong decline to 1970, followed by gradual increase differs distinctly from that shown by data reported to FAO. Reported landings show a steady increase from less than 1,000 t∙year-1 in the 1950s to around 6,000 t∙year-1 in the 2000s. In contrast, the total reconstructed catches suggest declines in total catches from around 20,000 t in 1950 to a low of about 5,000 t in 1970, before gradual increases to about 12 500 t·year-1 in the late 2000s. Major discrepancies between reported and reconstructed data are under-reported artisanal catches in the early decades (accounting for 86% of total catches, and the absence of subsistence catches (14% of total catches in reported data. Queen conch (Strombus gigas and Caribbean spiny lobster (Panulirus argus dominate reconstructed catches. No discards were estimated as fishing has been highly selective, carried out by hand collection (conch, trap or hook (lobster, or hook and line (finfish. New data published here from local seafood consumption surveys demonstrates that the total local consumption of conch equates to almost the entire total allowable catch, before exported amounts are even factored. Policy-makers in the Turks and Caicos need to act if the sustainability of the fisheries stock and fishing industry is to be ensured.

  5. Catch rates as indicators of ecosystem health and exploitation status in the shrimp fishery in the South China sea

    DEFF Research Database (Denmark)

    Christensen, Steen; van Thi, Dang

    2008-01-01

    Based on catch and effort data analyses covering the period 1996-2002, time series of catch rates in the trawl fisheries in the South China Sea along the coasts of Bac Lieu and Ca Mau in South East Vietnam were estimated. The indicators include catch rates for total shrimp catch, five major shrimp...... that might reflect seasonality in shrimp recruitment was found, making this resource potentially suitable for a fishery management system based on closed seasons. Further, the data indicate that the major part of the catches are comprised of low value species belonging to the genera Parapenaeopsis; whereas...... the requirement of a dynamic fishery management system....

  6. 77 FR 66746 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2012-11-07

    ... research in the 2010-2012 specifications (75 FR 48874, August 12, 2010). However, due to an over-harvest in Area 1A in 2010, the FY 2012 sub-ACL in Area 1A was revised to 24,668 mt on February 24, 2012 (77 FR... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for...

  7. 76 FR 61059 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch...

    Science.gov (United States)

    2011-10-03

    ...,362 mt and 0 mt of the sub-ACL is set aside for research (75 FR 48874, August 12, 2010). The... Northeastern United States; Atlantic Herring Fishery; Sub-ACL (Annual Catch Limit) Harvested for Management... calendar day until January 1, 2012, when the 2012 sub-ACL for Area 1B becomes available, except...

  8. Unexpectedly high catch-and-release rates in European marine recreational fisheries: implications for science and management

    DEFF Research Database (Denmark)

    Ferter, Keno; Weltersbach, Marc Simon; Strehlow, Harry Vincent;

    2013-01-01

    Unexpectedly high catch-and-release rates in European marine recreational fisheries: implications for science and management. – ICES Journal of Marine Science, 70: .While catch-and-release (C&R) is a well-known practice in several European freshwater recreational fisheries, studies on the magnitu...

  9. 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. PMID:26676971

  10. 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.

  11. Will a catch share for whales improve social welfare?

    Science.gov (United States)

    Smith, Martin D; Asche, Frank; Bennear, Lori S; Havice, Elizabeth; Read, Andrew J; Squires, Dale

    2014-01-01

    We critique a proposal to use catch shares to manage transboundary wildlife resources with potentially high non-extractive values, and we focus on the case of whales. Because whales are impure public goods, a policy that fails to capture all nonmarket benefits (due to free riding) could lead to a suboptimal outcome. Even if free riding were overcome, whale shares would face four implementation challenges. First, a whale share could legitimize the international trade in whale meat and expand the whale meat market. Second, a legal whale trade creates monitoring and enforcement challenges similar to those of organizations that manage highly migratory species such as tuna. Third, a whale share could create a new political economy of management that changes incentives and increases costs for nongovernmental organizations (NGOs) to achieve the current level of conservation. Fourth, a whale share program creates new logistical challenges for quota definition and allocation regardless of whether the market for whale products expands or contracts. Each of these issues, if left unaddressed, could result in lower overall welfare for society than under the status quo. PMID:24640530

  12. Catch-Quota Management - an example of result based fisheries management

    DEFF Research Database (Denmark)

    Kirkegaard, Eskild; Schou, Mogens; Dalskov, Jørgen

    The European Commission tabled in July 2011 a proposal for a revision of the Common Fisheries Policy (CFP). A central element of the revision is the introduction of a quota management system where all fish caught count against the quotas. The principle of full accountability of the catch...... is a complete change from present management where only the fish landed count against the quotas. The principle of full accountability opens for the introduction of a result based fisheries management strategy, where a fishery is regulated by clearly stated results and the fisher enjoys a maximum of freedom...

  13. Estimation of unreported catch in a commercial trawl fishery

    OpenAIRE

    McBride, Margaret Mary

    1991-01-01

    The Institute of Marine Research (IMR), Bergen, has carried out combined bottom trawl and acoustic surveys for cod in the Barents Sea since 1981. Commercial statistics are collected routinely for this area through the Directorate of Fisheries; the Institute collects length and age samples of these landings. Also, the Institute of Fishery Technology Research conducted studies of cod-end selectivity for Norwegian bottom trawlers in the Barents Sea during 1989. These data are read...

  14. 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.

  15. Big catch, little sharks: Insight into Peruvian small-scale longline fisheries

    OpenAIRE

    Doherty, Philip D; Alfaro-Shigueto, Joanna; David J Hodgson; Mangel, Jeffrey C; Witt, Matthew J; Godley, Brendan J.

    2014-01-01

    Shark take, driven by vast demand for meat and fins, is increasing. We set out to gain insights into the impact of small-scale longline fisheries in Peru. Onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from Ilo, southern Peru. Fishing effort is divided into two seasons: targeting dolphinfish (Coryphaena hippurus; December to February) and sharks (March to November). A total of 16,610 sharks were observed caught, with 11,166 identi...

  16. Catch, bycatch and discards of the Galapagos Marine Reserve small-scale handline fishery

    Directory of Open Access Journals (Sweden)

    Johanna S. Zimmerhackel

    2015-06-01

    Full Text Available Fisheries bycatch is a significant marine conservation issue as valuable fish are wasted and protected species harmed with potential negative ecological and socio-economic consequences. Even though there are indications that the small-scale handline fishery of the Galapagos Marine Reserve has a low selectivity, information on its bycatch has never been published. We used onboard monitoring and interview data to assess the bycatch of the Galapagos handline fishery by estimating the bycatch ratio, determining species compositions of landings and bycatch, identifying fishers’ reasons for discarding certain individuals, and revealing historical trends in the bycatch ratio. The estimated bycatch ratio as a function of biomass of 0.40 and a diverse species composition of target catch and bycatch confirmed the low selectivity of this fishery. Most individuals were not landed for economic motivations, either because species (77.4% or sizes (17.7% are unmarketable or for regulatory reasons (5.9%. We found that bycatch contributes to growth overfishing of some target species because they are discarded or used as bait before reaching their first maturity. Moreover, over half of interviewees perceived a historical decrease in bycatch ratios that was explained by a diversification of the target catch due to the reduction in abundance of the traditionally most important target species. As some target species show signs of overfishing and to date there are no specific regulations for the finfish fishery species in place, we recommend the implementation of a series of management measures to protect critical life stages of overexploited species and to improve the selectivity of the Galapagos handline fishery.

  17. Projected Scenarios for Coastal First Nations' Fisheries Catch Potential under Climate Change: Management Challenges and Opportunities.

    Science.gov (United States)

    Weatherdon, Lauren V; Ota, Yoshitaka; Jones, Miranda C; Close, David A; Cheung, William W L

    2016-01-01

    Studies have demonstrated ways in which climate-related shifts in the distributions and relative abundances of marine species are expected to alter the dynamics and catch potential of global fisheries. While these studies assess impacts on large-scale commercial fisheries, few efforts have been made to quantitatively project impacts on small-scale subsistence and commercial fisheries that are economically, socially and culturally important to many coastal communities. This study uses a dynamic bioclimate envelope model to project scenarios of climate-related changes in the relative abundance, distribution and richness of 98 exploited marine fishes and invertebrates of commercial and cultural importance to First Nations in coastal British Columbia, Canada. Declines in abundance are projected for most of the sampled species under both the lower (Representative Concentration Pathway [RCP] 2.6) and higher (RCP 8.5) emission scenarios (-15.0% to -20.8%, respectively), with poleward range shifts occurring at a median rate of 10.3 to 18.0 km decade(-1) by 2050 relative to 2000. While a cumulative decline in catch potential is projected coastwide (-4.5 to -10.7%), estimates suggest a strong positive correlation between the change in relative catch potential and latitude, with First Nations' territories along the northern and central coasts of British Columbia likely to experience less severe declines than those to the south. Furthermore, a strong negative correlation is projected between latitude and the number of species exhibiting declining abundance. These trends are shown to be robust to alternative species distribution models. This study concludes by discussing corresponding management challenges that are likely to be encountered under climate change, and by highlighting the value of joint-management frameworks and traditional fisheries management approaches that could aid in offsetting impacts and developing site-specific mitigation and adaptation strategies derived

  18. Functional diversity of catch mitigates negative effects of temperature variability on fisheries yields.

    Science.gov (United States)

    Dee, Laura E; Miller, Steve J; Peavey, Lindsey E; Bradley, Darcy; Gentry, Rebecca R; Startz, Richard; Gaines, Steven D; Lester, Sarah E

    2016-08-17

    Temperature variation within a year can impact biological processes driving population abundances. The implications for the ecosystem services these populations provide, including food production from marine fisheries, are poorly understood. Whether and how temperature variability impacts fishery yields may depend on the number of harvested species and differences in their responses to varying temperatures. Drawing from previous theoretical and empirical studies, we predict that greater temperature variability within years will reduce yields, but harvesting a larger number of species, especially a more functionally diverse set, will decrease this impact. Using a global marine fisheries dataset, we find that within-year temperature variability reduces yields, but current levels of functional diversity (FD) of targeted species, measured using traits related to species' responses to temperature, largely offset this effect. Globally, high FD of catch could avoid annual losses in yield of 6.8% relative to projections if FD were degraded to the lowest level observed in the data. By contrast, species richness in the catch and in the ecosystem did not provide a similar mitigating effect. This work provides novel empirical evidence that short-term temperature variability can negatively impact the provisioning of ecosystem services, but that FD can buffer these negative impacts. PMID:27534960

  19. 78 FR 9660 - Pacific Halibut Fisheries; Catch Sharing Plan

    Science.gov (United States)

    2013-02-11

    ... Pacific Council (60 FR 14651, March 20, 1995, as amended by 61 FR 35548). In each of the intervening years... season the final rule was published on March 22, 2012 (77 FR 16740), and the following section numbers..., and bocaccio rockfish of the Puget Sound/Georgia Basin. Area 2A partially overlaps with the...

  20. 77 FR 5473 - Pacific Halibut Fisheries; Catch Sharing Plan

    Science.gov (United States)

    2012-02-03

    ...-recommended long-term Plan (60 FR 14651, March 20, 1995). In each of the intervening years between 1995 and... through a final rule. For the 2011 fishing season the final rule was published on March 16, 2011 (76 FR... bocaccio rockfish of the Puget Sound/Georgia Basin. Area 2A partially overlaps with the Distinct...

  1. Development of new concepts for escape windows to minimise cod catches in Norway lobster fisheries

    DEFF Research Database (Denmark)

    Madsen, Niels; Frandsen, Rikke; Holst, René;

    2010-01-01

    particularly on moving the window further back, gaining more stability in the codend to avoid loss of Norway lobster through the window, making a relatively narrow section where the window is located, and testing larger mesh sizes in the window. We designed a four panel sorting section—the sorting box......—where a 300 mm window is placed at the top section at about 3–6 m from the codline. Acoustic release technology was used to avoid catch loss during gear retrieval. Sea trials were conducted in the Skagerrak and Kattegat from a commercial trawler. The sorting box yielded a high reduction of the cod catch......Gear selectivity with regard to cod (Gadus morhua) needs to be improved in the Kattegat and Skagerrak Norway lobster (Nephrops norvegicus) fishery. One way to achieve this goal is to improve the selectivity of an escape window (henceforth window) in the gear. Our gear development focused...

  2. Catch composition and management of daytime purse seine fishery on the Southern Mediterranean Sea Coast, Abu Qir Bay, Egypt

    Directory of Open Access Journals (Sweden)

    A. EL-HAWEET

    2012-12-01

    Full Text Available The present work aimed to obtain precise data on the catch of the purse seine net operating at daytime from sunrise till noon in Abu Qir Bay during 1997 and 1998. Sardine, anchovy, mullet and rabbitfish were recorded as the main target fish groups. Twenty-seven species were recorded as by-catch species. Catch per unit effort was estimated to be 93 kg/day/boat. The percentage of each target species in the catch and its length frequency distribution were presented. The length range of by-catch species and the season of catch were recorded. Daytime purse seine in Abu Qir Bay is an effective method but should regulated by directing the fishing to deeper waters outside the bay rather than the inshore coastal area to conserve many economic species of this important fishery.

  3. Big catch, little sharks: Insight into Peruvian small-scale longline fisheries.

    Science.gov (United States)

    Doherty, Philip D; Alfaro-Shigueto, Joanna; Hodgson, David J; Mangel, Jeffrey C; Witt, Matthew J; Godley, Brendan J

    2014-06-01

    Shark take, driven by vast demand for meat and fins, is increasing. We set out to gain insights into the impact of small-scale longline fisheries in Peru. Onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from Ilo, southern Peru. Fishing effort is divided into two seasons: targeting dolphinfish (Coryphaena hippurus; December to February) and sharks (March to November). A total of 16,610 sharks were observed caught, with 11,166 identified to species level. Of these, 70.6% were blue sharks (Prionace glauca), 28.4% short-fin mako sharks (Isurus oxyrinchus), and 1% were other species (including thresher (Alopias vulpinus), hammerhead (Sphyrna zygaena), porbeagle (Lamnus nasus), and other Carcharhinidae species (Carcharhinus brachyurus, Carcharhinus falciformis, Galeorhinus galeus). Mean ± SD catch per unit effort of 33.6 ± 10.9 sharks per 1000 hooks was calculated for the shark season and 1.9 ± 3.1 sharks per 1000 hooks were caught in the dolphinfish season. An average of 83.7% of sharks caught (74.7% blue sharks; 93.3% mako sharks) were deemed sexually immature and under the legal minimum landing size, which for species exhibiting k-selected life history traits can result in susceptibility to over exploitation. As these growing fisheries operate along the entire Peruvian coast and may catch millions of sharks per annum, we conclude that their continued expansion, along with ineffective legislative approaches resulting in removal of immature individuals, has the potential to threaten the sustainability of the fishery, its target species, and ecosystem. There is a need for additional monitoring and research to inform novel management strategies for sharks while maintaining fisher livelihoods. PMID:25360274

  4. Net discharge anomalies drive uncertainty in catch in the world's largest inland fishery

    Science.gov (United States)

    Sabo, J. L.

    2013-12-01

    The Mekong River is one of the world's largest rivers at more than 4,600 km long and a watershed of nearly 800,000 km2. The Tonle Sap Lake (TSL) in Cambodia is believed to be one of the most productive inland fisheries in the world because of its unique hydrologic regime and large input of nutrient-rich sediment from the Mekong. The TSL is the cornerstone of food security in Cambodia yielding ~ 15% of the estimated 2.6M tonne catch in the Mekong basin and providing key nursery habitat for fishes that constitute the catch in other parts of the basin. The TSL fishery is driven by a flood pulse that occurs during and after the SE Asian Monsoon. The timing, duration and magnitude of the monsoon is thought to be a key driver of primary and secondary (fish) production in the system. All three-timing, duration and magnitude--are likely to be different under future climate and as a result of the proposed and recently constructed dams on tributaries in Vietnam and elsewhere. Here I use spectral methods to characterize the timing and magnitude of the flood pulse. Specifically, I use the Discrete Fast Fourier Transform (DFFT) to estimate the seasonal trend in daily discharge for the past 40 years at the Stung Treng gage. The whitened time series represent departures from the long term trend--anomalies--and hence implicitly capture the timing of unusual events. I hypothesize that 'timing is everything' and hence that anomalies will capture variation in the second moment of the fishery. Using a novel metric--the net annual discharge anomaly--I show that catch is significantly more variable in years with net negative flow anomalies; and quite predictable in years with net positive flow anomalies. These results suggest that changes in timing of monsoon flows alone--due to climate change or dams--can significantly increase the uncertainty in catch of a fishery that is vital for food security in the Mekong basin.

  5. Incentivising selective fishing under catch quotas: using an FCube modelling approach to evaluate management options for North Sea mixed fisheries

    DEFF Research Database (Denmark)

    Condie, Harriet M.; Dolder, Paul J.; Catchpole, Thomas L.;

    Reforms of EU Common Fisheries Policy will make fundamental changes to European fisheries management, including a discard ban with catch quotas for regulated species and management to achieve MSY. We evaluate the impact of these changes on revenue of North Sea demersal finfish fleets and fish...... stocks. With no change in behaviour, revenue is reduced by a mean of 31% compared to current management in the first year, but partly recovers by year 3, as fishing mortality is reduced and stocks increase. There are large differences in revenue changes between fleets, varying from -99% to +36...... in revenue create a strong incentive to avoid catching the limiting species, particularly if it is not a primary target. Selectivity changes that avoid 30% cod catch reduced the economic impact for some fleets in moving to catch quotas. Increased flexibility will therefore be important in maintaining...

  6. Habitat Mapping Of Blue Shark In The Eastern Mediterranean Sea: Application Of Generalized Additive Models On Commercial Fishery By-Catch

    OpenAIRE

    DAMALAS DIMITRIOS; MEGALOFONOU Persefoni

    2012-01-01

    Blue sharks (Prionace glauca, Linnaeus 1758), are repeatedly caught in the surface drifting longline fisheries throughout the eastern Mediterranean Sea. Based on a dataset derived from the Greek and Cypriot commercial fisheries, targeting swordfish during 1998-2005, we applied an information theoretic generalized additive model approach, modeling separately: (1) the probability of making a catch and (2) the positive catch rates. Analyses suggested... (+++)

  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. 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.

  9. 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. PMID:23840590

  10. Positive Catch & Economic Benefits of Periodic Octopus Fishery Closures: Do Effective, Narrowly Targeted Actions 'Catalyze' Broader Management?

    Directory of Open Access Journals (Sweden)

    Thomas A Oliver

    Full Text Available Eight years of octopus fishery records from southwest Madagascar reveal significant positive impacts from 36 periodic closures on: (a fishery catches and (b village fishery income, such that (c economic benefits from increased landings outweigh costs of foregone catch. Closures covered ~20% of a village's fished area and lasted 2-7 months.Octopus landings and catch per unit effort (CPUE significantly increased in the 30 days following a closure's reopening, relative to the 30 days before a closure (landings: +718%, p<0.0001; CPUE: +87%, p<0.0001; n = 36. Open-access control sites showed no before/after change when they occurred independently of other management ("no ban", n = 17/36. On the other hand, open-access control sites showed modest catch increases when they extended a 6-week seasonal fishery shutdown ("ban", n = 19/36. The seasonal fishery shutdown affects the entire region, so confound all potential control sites.In villages implementing a closure, octopus fishery income doubled in the 30 days after a closure, relative to 30 days before (+132%, p<0.001, n = 28. Control villages not implementing a closure showed no increase in income after "no ban" closures and modest increases after "ban" closures. Villages did not show a significant decline in income during closure events.Landings in closure sites generated more revenue than simulated landings assuming continued open-access fishing at that site (27/36 show positive net earnings; mean +$305/closure; mean +57.7% monthly. Benefits accrued faster than local fishers' time preferences during 17-27 of the 36 closures. High reported rates of illegal fishing during closures correlated with poor economic performance.We discuss the implications of our findings for broader co-management arrangements, particularly for catalyzing more comprehensive management.

  11. Moving beyond catch in allocation approaches for internationally shared fish stocks

    NARCIS (Netherlands)

    Bailey, M.L.; Ishimura, G.; Paisley, R.; Rashid Sumaila, U.

    2013-01-01

    Allocation schemes are one way to combat the tragedy of the commons, the situation whereby individual users of a shared resource put their own interests above the collective good. In the case of shared fisheries, developing equitable and transparent allocation schemes can help to ensure stable coope

  12. Trade-offs among catch, bycatch, and landed value in the American Samoa longline fishery.

    Science.gov (United States)

    Watson, Jordan T; Bigelow, Keith A

    2014-08-01

    The interspecific preferences of fishes for different depths and habitats suggest fishers could avoid unwanted catches of some species while still effectively targeting other species. In pelagic longline fisheries, albacore (Thunnus alalunga) are often caught in relatively cooler, deeper water (>100 m) than many species of conservation concern (e.g., sea turtles, billfishes, and some sharks) that are caught in shallower water (Carcharhinus falciformis), and 42.6% (n = 150) of oceanic whitetip shark (C. longimanus) were caught on the 3 shallowest hooks. Eleven percent (n = 20,435) of all tuna and 8.5% (n = 10,374) of albacore were caught on the 3 shallowest hooks. Hook elimination reduced landed value by 1.6-9.2%, and redistribution of hooks increased average annual landed value relative to the status quo by 5-11.7%. Based on these scenarios, redistribution of hooks to deeper depths may provide an economically feasible modification to longline gear that could substantially reduce bycatch for a suite of vulnerable species. Our results suggest that this method may be applicable to deep-set pelagic longline fisheries worldwide. PMID:24628499

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

    OpenAIRE

    Lilia Dmitrieva; Andrey A Kondakov; Eugeny Oleynikov; Aidyn Kydyrmanov; Kobey Karamendin; Yesbol Kasimbekov; Mirgaliy Baimukanov; Susan Wilson; 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 occu...

  14. Catch-quota balancing in mixed-fisheries: a bio-economic modelling approach applied to the New Zealand hoki (Macruronus novaezelandiae) fishery

    OpenAIRE

    Marchal, Paul; Francis, Chris; Lallemand, Philippe; Lehuta, Sigrid; Mahevas, Stephanie; Stokes, Kevin; Vermard, Youen

    2009-01-01

    Managing adequately the exploitation of commercial species subject to technical interactions is a key step towards the ecosystem approach to fisheries. We evaluate here, using a bio-economic modelling approach building on the ISIS-Fish simulation platform, the relative impact of total allowable commercial catches (TACC) and of taxes applicable to over-quota landings (deemed value) on the sustainability of a selection of species exploited by the New Zealand hoki (Macruronus novaezelandiae) fis...

  15. Recreational fishery catch and effort estimates for large pelagic species from Maine through Virginia from 2002-06-01 to 2014-10-31 (NCEI Accession 0137959)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — On the Atlantic Coast from Maine to Virginia, NOAA Fisheries uses the Large Pelagics Survey (LPS) to measure the total recreational catch of large pelagics fish...

  16. River lamprey, Lampetra fluviatilis L., fishery in Latvia – insight into the origin of catch statistics data

    Directory of Open Access Journals (Sweden)

    Abersons Kaspar

    2014-09-01

    Full Text Available Most research to date on the status of the river lamprey, Lampetra fluviatilis L. in Latvia has been done based on catch statistics data. The aim of this study was to explore the present status of the river lamprey fishery in Latvia to improve the understanding of catch statistics data. Currently, river lamprey fishing in Latvia is carried out at 24 fishing grounds located on 17 rivers. The most popular fishing gear is the lamprey fyke net, but lamprey weirs and lamprey trammel nets are also used. The type and design of the fishing gear depends on the parameters of the fishing ground. The catch size is highly variable and is greatly affected by the number of non-resources related circumstances, such as fishing regulations and meteorological factors determining the intensity of lamprey migration during the fishing season and opportunities for fishing during periods of the most intense migration. The fishing effort and the type of fishing gear have also largely changed since the 1960s and 1970s. Therefore, the fluctuation in both the long- and short-term catch data may not correspond to changes in the actual status of the lamprey population.

  17. Identification of factors influencing shark catch and mortality in the Marshall Islands tuna longline fishery and management implications.

    Science.gov (United States)

    Bromhead, D; Clarke, S; Hoyle, S; Muller, B; Sharples, P; Harley, S

    2012-04-01

    Recent average annual catches of sharks by tuna longline vessels fishing in the Republic of the Marshall Islands (RMI) are estimated to be between 1583 and 2274 t. Although 22 shark species have been recorded by the observer programme for this fishery, 80% of the annual catch comprises only five species: blue shark Prionace glauca, silky shark Carcharhinus falciformis, bigeye thresher shark Alopias superciliosus, pelagic thresher shark Alopias pelagicus and oceanic whitetip shark Carcharhinus longimanus. Wire leaders (i.e. branch lines or traces) were also used by nearly all observed vessels. Generalized additive model (GAM)-based analyses of catch rates indicated that P. glauca and A. superciliosus are caught in higher numbers when vessels fish in relatively cooler waters, at night, close to the full moon, when the 27° C thermocline is close to the surface and during El Niño conditions. In contrast, C. falciformis, A. pelagicus and C. longimanus are caught in higher numbers when shark lines are used (all three species) or hooks are set at a shallow depth (A. pelagicus and C. longimanus and, also, P. glauca). These findings are generally consistent with current knowledge of these species' habitat preferences, movement and distribution. The results of these analyses were combined with information pertaining to shark condition and fate upon capture to compare the likely effectiveness of a range of potential measures for reducing shark mortality in the longline fishery. Of the options considered, the most effective would be to combine measures that reduce the catch rate (e.g. restrictions on the use of wire leaders, shark baits and shark lines) with measures that increase survival rates after post-capture release (e.g. finning bans). PMID:22497410

  18. Time series analyses reveal environmental and fisheries controls on Atlantic horse mackerel (Trachurus trachurus) catch rates

    Science.gov (United States)

    Leitão, Francisco

    2015-12-01

    Time-series models (Dynamic factorial analyses and; Min/max autocorrelation factor analysis) were used to explore the relative influences of environmental variables and fishing pressure of trawl, seine and artisanal fleets on catch rates on Trachurus trachurus in ICES IXa sub-divisions (IXaCN-North coast; IXa- CS-South coast; IXaS-Algarve, South coast, Algarve). Fishing effort influenced catch rates in all areas with a 2 year lag and fishing pressure for each area was related to specific fleet sectors effort. In IXaCN, winter upwelling (spawning peak) and both summer northerly wind and wind magnitude (outside of the spawning peak) were strongly correlated with catch rates. In IXaCS summer/autumn westerly winds were related with catch rates. Northerly winds in spring, upwelling and SST (winter and autumn) were related with catch rates in IXaS-Algarve. For species with a long spawning season such as horse mackerel, seasonal analyses at broad regional scales can detract from a better understanding of variability in short term sub-stock catch rates. Favorable environmental conditions, even during seasons with low spawning activity can positively affect catch rates. Ignoring the role of regional oceanographic features on the spatial distribution of the sub-stocks when analysing variability in catch rates can lead to poor inferences about the productivity of the populations.

  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. 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.

  1. Does by-catch pose a threat for the conservation of seabird populations in the southern Ionian Sea (eastern Mediterranean? A questionnaire based survey of local fisheries

    Directory of Open Access Journals (Sweden)

    G. KARRIS

    2013-07-01

    Full Text Available A significant number of studies worldwide have shown that incidental catches (by-catch of seabirds in fishing gear might pose a considerable risk for the conservation of their populations. Nevertheless reliable data on by-catch rates of seabirds in European marine ecosystems are patchy and need to be improved. This study constitutes a first attempt at the evaluation of by-catch rates in the southern Ionian Sea. Data were obtained by distributing a specific questionnaire to the fishers of Zakynthos Island. 150 professional fishers (representing 90% of the local fishing fleet participated in the research, and were interviewed during July-December 2010. The information collected showed that commercial longline and (to a lesser extent gillnet fishery gears caused incidental catches mostly of Scopoli’s Shearwater and Mediterranean Shag. The temporal analysis of the incidental bird mortality showed that seabirds were more susceptible to be trapped in fishery gears set around sunrise during spring and summer whereas spatial analysis of by-catch data indicated variations in the number of seabirds caught in different fishery areas.

  2. Present and Future Potential Habitat Distribution of Carcharhinus falciformis and Canthidermis maculata By-Catch Species in the Tropical Tuna Purse-Seine Fishery under Climate Change

    OpenAIRE

    Lezama-Ochoa, Nerea; Murua, Hilario; Chust, Guillem; van Loon, Emiel; Ruiz, Jon; Hall, Martin; Chavance, Pierre; Delgado De Molina, Alicia; Villarino, Ernesto

    2016-01-01

    By-catch species from tropical tuna purse seine fishery have been affected by fishery pressures since the last century; however, the habitat distribution and the climate change impacts on these species are poorly known. With the objective of predicting the potential suitable habitat for a shark (Carcharhinus falciformis) and a teleost (Canthidermis maculata) in the Indian, Atlantic and Eastern Pacific Oceans, a MaxEnt species distribution model (SDM) was developed using data collected by obse...

  3. Present and future potential habitat distribution of Carcharhinus falciformis and Canthidermis maculata by-catch species in the tropical tuna purse-seine fishery under climate change

    OpenAIRE

    Nerea eLezama Ochoa; Hilario eMurua; Guillem eChust; Emiel eVan Loon; Jon eRuiz; Martin eHall; Pierre eChavance; Alicia eDelgado de Molina; Ernesto eVillarino

    2016-01-01

    By-catch species from tropical tuna purse seine fishery have been affected by fishery pressures since the last century; however, the habitat distribution and the climate change impacts on these species are poorly known. With the objective of predicting the potential suitable habitat for a shark (Carcharhinus falciformis) and a teleost (Canthidermis maculata) in the Indian, Atlantic and Eastern Pacific Oceans, a MaxEnt species distribution model (SDM) was developed using data collected by obse...

  4. Understanding fisheries credit systems: potentials and pitfalls of managing catch efficiency

    NARCIS (Netherlands)

    Riel, van M.C.; Bush, S.R.; Zwieten, van P.A.M.; Mol, A.P.J.

    2015-01-01

    Following implementation in a range of other resource sectors, a number of credit-like systems have been proposed for fisheries. But confusion exists over what constitutes these nascent ‘fisheries credit’ systems and how they operate. Based on a review of credit systems in other sectors, this study

  5. 78 FR 63406 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-Annual Catch Limit...

    Science.gov (United States)

    2013-10-24

    ... Administration (NOAA), Commerce. ACTION: Temporary rule; closure. SUMMARY: Effective 1200 hr, October 24, 2013... (October 4, 2013, 78 FR 61828). The regulations at Sec. 648.201 require that when the Administrator... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC906 Fisheries of...

  6. 77 FR 10977 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Sub-Annual Catch Limit...

    Science.gov (United States)

    2012-02-24

    ... Administration (NOAA), Commerce. ACTION: Temporary rule; closure. SUMMARY: NMFS announces that, effective 0001 hr... specifications (75 FR 48874, August 12, 2010). However, due to an over- harvest in Area 1B in 2010, the FY 2012... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA971 Fisheries of...

  7. Do North Sea cod (Gadus morhua) fisheries maintain high catch rates at low stock size?

    DEFF Research Database (Denmark)

    Rindorf, Anna; Andersen, Bo Sølgaard

    2008-01-01

    This study presents all investigation of the relationship between stock size of North Sea cod (Gadus morhua) and catch rates in seven commercial fishing fleets. The shape of the relationship was estimated using a model allowing both density-dependent changes in catchability and bias in the assess......This study presents all investigation of the relationship between stock size of North Sea cod (Gadus morhua) and catch rates in seven commercial fishing fleets. The shape of the relationship was estimated using a model allowing both density-dependent changes in catchability and bias......, the change was insufficient to compensate for the decrease in stock size, and catch rates of all fleets decreased. Two factors that could lead to nonconstant catchability were investigated: (i) the presence of decoupling between stock size and density ill high-density areas and (ii) the presence...

  8. Fish catches from Lake Tanganyika mainly reflect changes in fishery practices, not climate

    NARCIS (Netherlands)

    Sarvala, J.; Langenberg, V.T.; Salonen, K.; Chitamwebwa, D.; Coulter, G.W.; Huttula, T.; Kanyaru, R.; Kotilainen, P.; Makasa, S.; Mulimbwa, N.; Molsa, H.

    2006-01-01

    Recently it was claimed that an increase in regional temperature, related to global climate change, has resulted in substantial decline in the pelagic fish catches from Lake Tanganyika, East Africa. Surface temperatures of Tanganyika indeed show warming trends, but evidence for decreased productivit

  9. Effects of trawling on the diets of common demersal fish by-catch of a tropical prawn trawl fishery.

    Science.gov (United States)

    Dell, Q; Griffiths, S P; Tonks, M L; Rochester, W A; Miller, M J; Duggan, M A; van der Velde, T D; Pillans, R D; Coman, G J; Bustamante, R H; Milton, D A

    2013-03-01

    The ecological effect of prawn trawling on the benthos of the Gulf of Carpentaria, northern Australia, was investigated by examining stomach contents of common demersal fishes incidentally caught as by-catch in the fishery. Fishes were collected from high and low fishing intensity sites in three regions based on vessel monitoring system data. The diets of eight species of benthic fish predators were compared between regions and fishing intensities. A regional effect on diet was evident for seven species. Only one generalist species had no significant difference in diet among the three regions. For the comparisons within each region, five predator species had significantly different diet between high and low fishing intensities in at least one region. Across the three regions, high fishing intensity sites had predators that consumed a greater biomass of crustaceans, molluscs and echinoderms. At low fishing intensity sites, predators had diets comprising a greater biomass of cnidarians and teleosts, and a different assemblage of molluscs, crustaceans and fishes. These changes in diet suggest that there may have been a shift in the structure of the benthic community following intensive fishing. Analysis of predator diets is a useful tool to help identify changes in the benthic community composition after exposure to fishing. This study also provided valuable diet information on a range of abundant generalist benthic predators to improve the ecosystem modelling tools needed to support ecosystem-based fisheries management.

  10. 77 FR 6019 - Western Pacific Fisheries; 2012 Annual Catch Limits and Accountability Measures

    Science.gov (United States)

    2012-02-07

    ... from the Western Pacific Fishery Management Council (Council), 1164 Bishop St., Suite 1400, Honolulu....regulations.gov , or Michael D. Tosatto, Regional Administrator, NMFS Pacific Islands Region (PIR), 1601... for public comments (77 FR 66) on proposed specifications that are finalized here....

  11. 78 FR 15885 - Western Pacific Fisheries; 2013 Annual Catch Limits and Accountability Measures

    Science.gov (United States)

    2013-03-13

    ... from the Western Pacific Fishery Management Council (Council), 1164 Bishop St., Suite 1400, Honolulu... available from www.regulations.gov , or from Michael D. Tosatto, Regional Administrator, NMFS Pacific... Monument, typically within about 50 nm of shore (Presidential Proclamation 8336, January 12, 2009, 74...

  12. 76 FR 37285 - Fisheries in the Western Pacific; Mechanism for Specifying Annual Catch Limits and Accountability...

    Science.gov (United States)

    2011-06-27

    ... in a fishery management plan as ``ecosystem component species,'' which are generally non-target... Pacific MUS that the Council has identified to be, generally, a non-target species, not determined to be... Responses On March 31, 2011, NMFS published a proposed rule and request for public comment (76 FR...

  13. The accuracy of self-reported fisheries data: Oregon trawl logbook fishing locations and retained catches

    OpenAIRE

    SAMPSON DAVID

    2011-01-01

    Self-reporting of information is an inexpensive means for collecting data on fishing or other human activities, but the accuracy of self-reported data can be difficult to measure. Logbooks that record fishing activities are a common form of self-reporting that can provide vast amounts of information about a fishery. Using logbook data from trawlers from Oregon ports operating along the US Pacific coast during 1987–2001, this study examined (a) the consistency of reported tow locat...

  14. Utilization of fisheries by-catch and processing wastes for lactic acid fermented silage and evaluation of degree of protein hydrolysis and in vitro digestibility

    OpenAIRE

    J. C. Ramírez- Ramírez; Huerta, S; Arias, L.; Prado, A.; Shirai, K.

    2008-01-01

    The purpose of this study was to produce protein hydrolysates from lactic acid fermentation of three sources of fish wastes: Shrimp by catch (SC), Sphyraena ensis wastes (SB) and mixture of fisheries processing wastes from several species (MixW). MixW were added with several sugar cane molasses concentrations as the carbon source, 180 g.kg-1 of sugar molasses gave the fastest acidification. The maximum concentration of lactic acid (Pmax) was significantly higher with Lactobacillus sp. B2 than...

  15. Sharing responsibilities in fisheries management; Part 2 - Annex: case studies

    NARCIS (Netherlands)

    Hoof, van L.J.W.; Hoefnagel, E.W.J.; Schans, van der J.W.; Nielsen, J.R.; Christensen, A.; Sverdrup-Jensen, S.; Delaney, A.; Jentoft, S.; Mikalsen, K.; Karlsen, G.R.; Bodiguel, C.; Catanzano, J.; Suarez de Vivero, J.L.; Alba, I.M.; Dominquez, S.F.; Rommel, D.

    2005-01-01

    This report focuses on the evaluation of the process of devolution of responsibilities in the current institutional landscape in European fisheries management. In particular the analysis focuses on how the present management systems contribute to good governance. We follow the criteria as suggested

  16. Sharing responsibilities in fisheries management; Part 1 - Final Report

    NARCIS (Netherlands)

    Hoof, van L.J.W.; Hoefnagel, E.W.J.; Schans, van der J.W.; Nielsen, J.R.; Christensen, A.; Sverdrup-Jensen, S.; Delaney, A.; Jentoft, S.; Mikalsen, K.; Karlsen, G.R.; Bodiguel, C.; Catanzano, J.; Suarez de Vivero, J.L.; Alba, I.M.; Domingues, S.R.; Rommel, D.

    2005-01-01

    This report focuses on the evaluation of the process of devolution of responsibilities in the current institutional landscape in European fisheries management. In particular the analysis focuses on how the present management systems contribute to good governance. We follow the criteria as suggested

  17. Incidental catch of marine turtles by the artisanal fisheries on Santa Catarina Island, SC, Brazil

    Directory of Open Access Journals (Sweden)

    Natalia Hanazaki

    2006-12-01

    Full Text Available The five species of sea turtles, which inhabit the Brazilian shore, have a wordwide distribution and are threatened with extinction. The south of Brazil is characterized as a feeding and breeding area of at least three of these species. The presence of turtles close to the shore and their incidental catch are occurrences reported by artisan fishermen of the Island of Santa Catarina in this work. The study was based on a questionnaire, applied to fishermen and fishfarmers at selected spots on the island. Scientific and popular names were matched using illustrations. The spots with the highest number of events and captures were close to the islands, rocky coasts and stony grounds, i.e. areas related with the foraging habits of the most abundant species, Chelonia mydas. The place, depth and size of the net are characteristics, which influence the capture. The time the net remains in the water is a factor which is fundamental to the survival of the captured turtles. The flesh of the turtle is used as an occasional feeding resource. Capacitation programs and training applied to the communities involved are recommended.

  18. Changes in Patterns of Seasonality Shown by Migratory Fish under Global Warming: Evidence from Catch Data of Taiwan’s Coastal Fisheries

    Directory of Open Access Journals (Sweden)

    Ching-Hsien Ho

    2016-03-01

    Full Text Available In this study, we analyzed the fish species composition data of coastal capture fisheries in Taiwan between 1963 and 2010. The purpose of the analysis was to understand the long-term changes in marine ecosystems. A ratio-to-moving average method was used in conjunction with adjusted seasonal indices to determine the seasonality of individual catch items and to examine the trends shown by the species with the same seasonality. Over the 48-year timespan of the data, 31 species, i.e., 64% of the total number of species, were identified as seasonal migrants. The catch ratio for species showing a single peak in the spring increased steadily over time; however, those species with a single peak in the winter decreased. The catch ratio for those species with dual peaks in both summer and fall varied greatly before 1978. Increasing trends began in the 1980s and accelerated until 1998. As a result of this increase, the previous concentration of the fishing season in the winter months became highly diffuse. Additionally, the winter and/or spring species continued to decrease year after year as the summer and/or autumn species gradually came to dominate the catch. This change in fishing seasonality is likely not an anthropogenic effect. However, the change coincides with trends in sea surface temperature fluctuations. Such variation may not only cause structural change in marine ecosystems but can also significantly impact the economy and the livelihoods of those associated with the fishing trade.

  19. 50 CFR 300.63 - Catch sharing plan and domestic management measures in Area 2A.

    Science.gov (United States)

    2010-10-01

    ... Federal Register the final rule governing sport fishing in area 2A. Annual management measures may be...) Flexible Inseason Management Provisions for Sport Halibut Fisheries in Area 2A. (1) The Regional... unused quota to another Oregon sport subarea. (2) Flexible inseason management provisions include,...

  20. 78 FR 39121 - Pacific Halibut Fisheries; Catch Sharing Plan for Guided Sport and Commercial Fisheries in Alaska

    Science.gov (United States)

    2013-06-28

    ...) and approved status quo management measures for Area 3A for 2013 (78 FR 16423, March 15, 2013... the status quo charter management measures in Area 2C for the 2013 season. At its annual meeting in... (357.4 mt). The IPHC unanimously recommended status quo management (i.e., the U45/O68 reverse...

  1. Present and future potential habitat distribution of Carcharhinus falciformis and Canthidermis maculata by-catch species in the tropical tuna purse-seine fishery under climate change

    Directory of Open Access Journals (Sweden)

    Nerea eLezama Ochoa

    2016-03-01

    Full Text Available By-catch species from tropical tuna purse seine fishery have been affected by fishery pressures since the last century; however, the habitat distribution and the climate change impacts on these species are poorly known. With the objective of predicting the potential suitable habitat for a shark (Carcharhinus falciformis and a teleost (Canthidermis maculata in the Indian, Atlantic and Eastern Pacific Oceans, a MaxEnt species distribution model (SDM was developed using data collected by observers in tuna purse seiners. The relative percentage of contribution of some environmental variables (depth, sea surface temperature, salinity and primary production and the potential impact of climate change on species habitat by the end of the century under the A2 scenario (scenario with average concentrations of carbon dioxide of 856 ppm by 2100 were also evaluated. Results showed that by-catch species can be correctly modelled using observed occurrence records and few environmental variables with SDM. Results from projected maps showed that the equatorial band and some coastal upwelling regions were the most suitable areas for both by-catch species in the three oceans in concordance with the main fishing grounds. Sea surface temperature was the most important environmental variable which contributed to explain the habitat distribution of the two species in the three oceans in general. Under climate change scenarios, the largest change in present habitat suitability is observed in the Atlantic Ocean (around 16% of the present habitat suitability area of Carcharhinus falciformis and Canthidermis maculata, respectively whereas the change is less in the Pacific (around 10% and 8% and Indian Oceans (around 3% and 2 %. In some regions such as Somalia, the Atlantic equatorial band or Peru’s coastal upwelling areas, these species could lose potential habitat whereas in the south of the equator in the Indian Ocean, the Benguela System and in the Pacific coast of

  2. Fishery of the Uçá Crab Ucides Cordatus (Linnaeus, 1763 in a Mangrove Area in Cananéia, State of São Paulo, Brazil: Fishery Performance, Exploitation Patterns and Factors Affecting the Catches

    Directory of Open Access Journals (Sweden)

    Luis Felipe de Almeida Duarte

    2014-09-01

    Full Text Available The fishery of the mangrove crab (Ucides cordatus is one of the oldest sources of food, income and extractive activity in the estuarine systems of Brazil. The state of São Paulo has the largest population of any Brazilian state, and the city of Cananéia, in the Brazilian southeast has the highest recorded level of exploitation of the uçá-crab. Since 1990, this species has been under intense exploitation pressure due to the unauthorized use of a type of trap called 'redinha'. This type of fishing gear is considered harmful and is prohibited by Brazilian law, although its use is very common throughout the country. This study aims to evaluate the exploitation patterns of U. cordatus based on landing data and monitoring of the crab fishermen to verify the population structure of the crab stock and to identify the factors that influence the catches. A general view of the sustainability of the fishery for this resource is also provided for five defined mangrove sectors (areas A to E at Cananéia. For this purpose, fishery data were recorded during 2009-2010 by the Instituto de Pesca (APTA/SAA-SP, and monitoring of the capture procedures used by two fishermen was conducted to obtain biometry data (CW, carapace width and gender data for the captured crabs. The redinha trap was very efficient (86.4% and produced sustainable catches because the trapped crabs were legal-sized males (CW>60 mm, although some traps are lost or remain in the mangrove swamps and can cause pollution by introducing plastic debris. The fishery data were evaluated with a General Linear Model (GLM based on six factors: the characteristics of the crab fishermen, the time of capture (by month and year, the lunar phase, the productive sector and the reproductive period. The individual crab fishermen's empirical knowledge, the year of capture and the productive sector were the strongest influences on the crab catch per unit effort (CPUE. Differing extraction patterns were found in

  3. Fish diversity in central and southern California using fish catch and effort data from the Recreational Fisheries Information Network

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset was provided by the Recreational Fisheries Information Network (RecFIN), and contained GPS coordinates for 680 CPFV trips during 1999 and 2001 at...

  4. Fish assemblages in central and southern California using fish catch and effort data from the Recreational Fisheries Information Network

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset was provided by the Recreational Fisheries Information Network (RecFIN), and contained GPS coordinates for 680 CPFV trips during 1999 and 2001 at...

  5. AKRO/SF: Catch Accounting System (CAS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Catch Accounting System (CAS) creates total catch estimates for the groundfish fisheries in the Bering Sea/Aleutian Islands and Gulf of Alaska. Each year,...

  6. Characteristics of the shark fisheries of Fiji

    Science.gov (United States)

    Glaus, Kerstin B. J.; Adrian-Kalchhauser, Irene; Burkhardt-Holm, Patricia; White, William T.; Brunnschweiler, Juerg M.

    2015-12-01

    Limited information is available on artisanal and subsistence shark fisheries across the Pacific. The aim of this study was to investigate Fiji’s inshore fisheries which catch sharks. In January and February 2013, 253 semi-directive interviews were conducted in 117 villages and at local harbours on Viti Levu, Vanua Levu, Taveuni, Ovalau and a number of islands of the Mamanuca and Yasawa archipelagos. Of the 253 interviewees, 81.4% reported to presently catch sharks, and 17.4% declared that they did not presently catch any sharks. Of the 206 fishers that reported to catch sharks, 18.4% targeted sharks and 81.6% caught sharks as bycatch. When targeted, primary use of sharks was for consumption or for sale. Sharks caught as bycatch were frequently released (69.6%), consumed (64.9%) or shared amongst the community (26.8%). Fishers’ identification based on an identification poster and DNA barcoding revealed that at least 12 species of elasmobranchs, 11 shark and one ray species (Rhynchobatus australiae) were caught. This study, which is the first focused exploration of the shark catch in Fiji’s inshore fisheries, suggests that the country’s artisanal shark fisheries are small but have the potential to develop into larger and possibly more targeted fisheries.

  7. Characteristics of the shark fisheries of Fiji.

    Science.gov (United States)

    Glaus, Kerstin B J; Adrian-Kalchhauser, Irene; Burkhardt-Holm, Patricia; White, William T; Brunnschweiler, Juerg M

    2015-12-02

    Limited information is available on artisanal and subsistence shark fisheries across the Pacific. The aim of this study was to investigate Fiji's inshore fisheries which catch sharks. In January and February 2013, 253 semi-directive interviews were conducted in 117 villages and at local harbours on Viti Levu, Vanua Levu, Taveuni, Ovalau and a number of islands of the Mamanuca and Yasawa archipelagos. Of the 253 interviewees, 81.4% reported to presently catch sharks, and 17.4% declared that they did not presently catch any sharks. Of the 206 fishers that reported to catch sharks, 18.4% targeted sharks and 81.6% caught sharks as bycatch. When targeted, primary use of sharks was for consumption or for sale. Sharks caught as bycatch were frequently released (69.6%), consumed (64.9%) or shared amongst the community (26.8%). Fishers' identification based on an identification poster and DNA barcoding revealed that at least 12 species of elasmobranchs, 11 shark and one ray species (Rhynchobatus australiae) were caught. This study, which is the first focused exploration of the shark catch in Fiji's inshore fisheries, suggests that the country's artisanal shark fisheries are small but have the potential to develop into larger and possibly more targeted fisheries.

  8. The effect of rights-based fisheries management on risk taking and fishing safety.

    Science.gov (United States)

    Pfeiffer, Lisa; Gratz, Trevor

    2016-03-01

    Commercial fishing is a dangerous occupation despite decades of regulatory initiatives aimed at making it safer. We posit that rights-based fisheries management (the individual allocation of fishing quota to vessels or fishing entities, also called catch shares) can improve safety by solving many of the problems associated with the competitive race to fish experienced in fisheries around the world. The competitive nature of such fisheries results in risky behavior such as fishing in poor weather, overloading vessels with fishing gear, and neglecting maintenance. Although not necessarily intended to address safety issues, catch shares eliminate many of the economic incentives to fish as rapidly as possible. We develop a dataset and methods to empirically evaluate the effects of the adoption of catch shares management on a particularly risky type of behavior: the propensity to fish in stormy weather. After catch shares was implemented in an economically important US West Coast fishery, a fisherman's probability of taking a fishing trip in high wind conditions decreased by 82% compared with only 31% in the former race to fish fishery. Overall, catch shares caused the average annual rate of fishing on high wind days to decrease by 79%. These results are evidence that institutional changes can significantly reduce individual, voluntary risk exposure and result in safer fisheries.

  9. The effect of rights-based fisheries management on risk taking and fishing safety.

    Science.gov (United States)

    Pfeiffer, Lisa; Gratz, Trevor

    2016-03-01

    Commercial fishing is a dangerous occupation despite decades of regulatory initiatives aimed at making it safer. We posit that rights-based fisheries management (the individual allocation of fishing quota to vessels or fishing entities, also called catch shares) can improve safety by solving many of the problems associated with the competitive race to fish experienced in fisheries around the world. The competitive nature of such fisheries results in risky behavior such as fishing in poor weather, overloading vessels with fishing gear, and neglecting maintenance. Although not necessarily intended to address safety issues, catch shares eliminate many of the economic incentives to fish as rapidly as possible. We develop a dataset and methods to empirically evaluate the effects of the adoption of catch shares management on a particularly risky type of behavior: the propensity to fish in stormy weather. After catch shares was implemented in an economically important US West Coast fishery, a fisherman's probability of taking a fishing trip in high wind conditions decreased by 82% compared with only 31% in the former race to fish fishery. Overall, catch shares caused the average annual rate of fishing on high wind days to decrease by 79%. These results are evidence that institutional changes can significantly reduce individual, voluntary risk exposure and result in safer fisheries. PMID:26884188

  10. 75 FR 29725 - Mid-Atlantic Fishery Management Council; Public Hearings

    Science.gov (United States)

    2010-05-27

    ... management process; the biological and socio-economic outcomes of a catch share system and how such outcomes... National Oceanic and Atmospheric Administration RIN 0648-XW67 Mid-Atlantic Fishery Management Council... Administration (NOAA), Commerce. ACTION: Notice of public meetings. SUMMARY: The Mid-Atlantic Fishery...

  11. 78 FR 79388 - Western Pacific Pelagic Fisheries; Catch and Effort Limits for the U.S. Participating Territories

    Science.gov (United States)

    2013-12-30

    ... comments. Mail: Send written comments to Michael D. Tosatto, Regional Administrator, NMFS Pacific Islands....regulations.gov or the Council, 1164 Bishop St., Suite 1400, Honolulu, HI 96813, tel 808-522-8220, fax 808-522... (December 7, 2009, 74 FR 63999). This limit applied only to the Hawaii-based longline fisheries or...

  12. 76 FR 66021 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Generic Annual Catch Limits...

    Science.gov (United States)

    2011-10-25

    ..., sand perch, dwarf sand perch, blackline tilefish, schoolmaster, red hind, rock hind, dog snapper, and..., red hind, rock hind, misty grouper, schoolmaster, dog snapper, and mahogany snapper, sand perch and...) to the Reef Fish Resources, Red Drum, Shrimp, and Coral and Coral Reefs Fishery Management Plans...

  13. Incidental catch and estimated discards of pelagic sharks from the swordfish and tuna fisheries in the Mediterranean Sea

    OpenAIRE

    MEGALOFONOU Persefoni

    2005-01-01

    Large pelagic sharks are caught incidentally in the swordfish and tuna fisheries of the Mediterranean Sea. In our study, twelve shark species were documented as bycatch over three years from 1998 to 2000. Blue shark (Prionace glauca) was the predominant species in all gears and areas examined. Shortfin mako (Isurus oxyrinchus), common thresher shark (Alopias vulpinus), and tope shark (Galeorhinus galeus) were the next most abundant shark species—found in more than half of the areas samp...

  14. 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...

  15. A LATITUDINAL GRADIENT OF BETA DIVERSITY IN BY CATCH OF MARINE SHRIMPS FISHERIES IN BRAZILIAN NORTH COAST

    Directory of Open Access Journals (Sweden)

    Breno Portilho Maia

    2016-03-01

    Full Text Available Industrial shrimp fisheries in northern Brazil use vessels equipped with trawls of low selectivity that capture considerable amounts of non-target bycatch species, and consequently, generate fauna biomass. In this study, we aimed to examine the composition and distribution of ichthyofaunal bycatches associated with pink shrimp industrial fishery between May 2010 and June 2011. Seven vessels were monitored for a period of151 travel days, during which trawls were towed 461 times. The northern coast was subdivided into the Pará Continental Platform, Amazonas River Estuary (ARE, and Amapá Continental Platform (ACP. Perciformes was the most abundant order (68.91%; Sciaenidae, the most abundant family (55.89%; and Macrodon ancylodon, the most abundant species (23,48%. ARE and ACP are regions with high biological diversity and density of species and similar ichthyofauna. The similarities between ARE and ACP regions can be attributed to the Guiana Current, which carries most of the water drained from the rivers of the Amazon Basin along the coast of Amapá; it promotes the high productivity of these regions. Monitoring of shrimp trawl fishing in the northern coast of Brazil can contribute to the preservation of populations of endemic animal species such as Macrodon ancylodon and Stellifer rastrifer, which are frequently associated with shrimp bycatch and therefore, particularly affected by this type of fishing. Keywords: Farfantepenaeus subtilis; fish; Sciaenidae; industrial fishing.

  16. Descartes da pesca do camarão sete-barbas como fonte de alimento para aves marinhas Sea-bob-shrimp fishery's by-catch as a feeding source for seabirds

    Directory of Open Access Journals (Sweden)

    Joaquim Olinto Branco

    2001-03-01

    Full Text Available From July 1996 to June 1997, in Armação do Itapocoroy, Penha, Santa Catarina State, Brazil, monthly census were done in three areas of traditional fishery and Itacolomis islands. A total of 10021 seabirds were registered, belonging to eight species, five genus and four families. The average number of seabirds per dragging varied between 80,2 and 113,6. Sterna spp, appeared at first in 43,3% of the released by-catch, followed by Larus dominicanus Lichtenstein, 1823, Fregata magnificens Matheus, 1914, Phalacrocorax brasilianus (Humboldt, 1805 and Sula leucogaster Boddaert, 1783. The average size of the fish consumed by the seabirds oscillated from 8,3 cm (Sterna spp. to 18,5 cm (F. magnificens, with an average time from 6,12 to 7,55 minutes per by-catch released. In general, seabirds use 84,0% of the by-catch fish as a feeding source.

  17. Métiers, effort and catches of a Mediterranean small-scale coastal fishery: The case of the Côte Bleue Marine Park

    OpenAIRE

    Leleu, Kevin; Pelletier, Dominique; Charbonnel, Eric; Letourneur, Yves; Alban, Frederique; Bachet, Frederic; Boudouresque, Charles F.

    2014-01-01

    The overexploitation of fishery resources has led to a major fisheries crisis. In this context, artisanal fisheries, and in particular small-scale coastal fisheries, appear as relevant alternatives for a sustainable use of coastal resources. Marine Protected Areas (MPA) are more and more used as management tools for these fisheries, as protection effects and targeted access regulations may benefit to commercial fishers. Managers and scientists need then quantitative information not only to ad...

  18. Fisheries productivity and its effects on the consumption of animal protein and food sharing of fishers' and non-fishers' families.

    Science.gov (United States)

    da Costa, Mikaelle Kaline Bezerra; de Melo, Clarissy Dinyz; Lopes, Priscila Fabiana Macedo

    2014-01-01

    This study compared the consumption of animal protein and food sharing among fishers' and non-fishers' families of the northeastern Brazilian coast. The diet of these families was registered through the 24-hour-recall method during 10 consecutive days in January (good fishing season) and June (bad fishing season) 2012. Fish consumption was not different between the fishers' and non-fishers' families, but varied according to fisheries productivity to both groups. Likewise, food sharing was not different between the two groups, but food was shared more often when fisheries were productive. Local availability of fish, more than a direct dependency on fisheries, determines local patterns of animal protein consumption, but a direct dependency on fisheries exposes families to a lower-quality diet in less-productive seasons. As such, fisheries could shape and affect the livelihoods of coastal villages, including fishers' and non-fishers' families.

  19. Descarte de peixes na pesca comercial em Tefé, médio Solimões, Amazônia Central = Discarded catches from commercial fisheries in the middle Solimões river, Central Amazon region

    Directory of Open Access Journals (Sweden)

    Vandick da Silva Batista

    2008-01-01

    Full Text Available Descartes são comuns na pesca comercial, sendo avaliados para apoiar o manejo da pesca na região. Por meio de acompanhamentos diários das pescarias da frota comercial de Tefé, foi descrito o descarte de pescado no médio Solimões. Utilizando análises de correlação e covariância, foram avaliados fatores que determinam o descarte com três modalidades distintas de pesca. Os pescadores selecionaram o pescado no momento da captura por espécie e tamanho. As espécies de pescados mais descartados foram jaraquis, tucunarés e branquinhas, porém os mais freqüentes, no descarte, foram espécies dos Siluriformes. Os apetrechos de pesca analisados apresentaram diferenças nas características de seu descarte. O descarte foi menor na enchente-cheia (5-17% da captura, conforme apetrecho que durante a vazante-seca (20-62%, conforme apetrecho. Discards are common in commercial fishery, and are evaluated in order to support fisheries management in the region. Fish discards in themiddle Solimões River were described through daily monitoring of fishing activities by the commercial fleet of the town of Tefé. By making use of analyses of correlation and covariance, determinant factors for discards in three different types of fisheries wereevaluated. The crew selected the fish at the moment of capture, by species and size. Among the most discarded fish species were jaraquis Semaprochilodus spp., tucunarés Cichla spp. and branquinhas Curimatidae; however, the most frequently discarded were Siluriform species. The fishing gear analyzed featured differences in their discarding characteristics. Discard was lower during the flood period (5-17% of catches, depending on gear than during the dry season (20-62% of catches, depending on gear.

  20. Dispersal of grouper larvae drives local resource sharing in a coral reef fishery

    KAUST Repository

    Almany, Glenn R.

    2013-04-01

    In many tropical nations, fisheries management requires a community-based approach because small customary marine tenure areas define the spatial scale of management [1]. However, the fate of larvae originating from a community\\'s tenure is unknown, and thus the degree to which a community can expect their management actions to replenish the fisheries within their tenure is unclear [2, 3]. Furthermore, whether and how much larval dispersal links tenure areas can provide a strong basis for cooperative management [4, 5]. Using genetic parentage analysis, we measured larval dispersal from a single, managed spawning aggregation of squaretail coral grouper (Plectropomus areolatus) and determined its contribution to fisheries replenishment within five community tenure areas up to 33 km from the aggregation at Manus Island, Papua New Guinea. Within the community tenure area containing the aggregation, 17%-25% of juveniles were produced by the aggregation. In four adjacent tenure areas, 6%-17% of juveniles were from the aggregation. Larval dispersal kernels predict that 50% of larvae settled within 14 km of the aggregation. These results strongly suggest that both local and cooperative management actions can provide fisheries benefits to communities over small spatial scales. © 2013 Elsevier Ltd.

  1. Discarding in UK Commercial Fisheries

    OpenAIRE

    Condie, Harriet

    2013-01-01

    Discarding, or returning unwanted catch to the sea, is a common feature of European fisheries, and is widely acknowledged as morally wrong. It wastes food and economic resources, and has contributed to overfishing in EU stocks. However, under the current Common Fisheries Policy (CFP), catch that is below minimum landings sizes, exceeds quota, or does not match catch composition regulations must be discarded. The high profile of discarding in recent years has put pressure on the...

  2. Clean catch urine sample

    Science.gov (United States)

    Urine culture - clean catch; Urinalysis - clean catch; Clean catch urine specimen; Urine collection - clean catch ... lips" (labia). You may be given a special clean-catch kit that contains sterile wipes. Sit on ...

  3. The Lake Albert light fishery

    OpenAIRE

    2009-01-01

    Fishing using light to attract fish (The light fishery) was introduced on Lake AIbert from Lake Victoria where it is used to catch mukene Rastrineobola argentea. The light fishery on Lake Albert targets ragoge brycinus nurse and mukene/muziri (Neobola bredoi), These species species now contribute to more than 50% of the catches from this lake. Ragoge and muziri were until the early 1990's not important in the commercial fishery but only served as food to the large predatory fis...

  4. 50 CFR 679.84 - Rockfish Program recordkeeping, permits, monitoring, and catch accounting.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Rockfish Program recordkeeping, permits, monitoring, and catch accounting. 679.84 Section 679.84 Wildlife and Fisheries FISHERY CONSERVATION AND..., permits, monitoring, and catch accounting. (a) Recordkeeping and reporting. See § 679.5(r). (b)...

  5. 50 CFR 679.93 - Amendment 80 Program recordkeeping, permits, monitoring, and catch accounting.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Amendment 80 Program recordkeeping, permits, monitoring, and catch accounting. 679.93 Section 679.93 Wildlife and Fisheries FISHERY... recordkeeping, permits, monitoring, and catch accounting. (a) Recordkeeping and reporting. See § 679.5(s)....

  6. Comparison of modern and historical fish catches (AD 750-1400) to inform goals for marine protected areas and sustainable fisheries.

    Science.gov (United States)

    McClanahan, Timothy R; Omukoto, Johnstone O

    2011-10-01

    We tested the unsustainable fishing hypothesis that species in assemblages of fish differ in relative abundance as a function of their size, growth rates, vagility, trophic level, and diet by comparing species composition in historical bone middens, modern fisheries, and areas closed to fishing. Historical data came from one of the earliest and most enduring Swahili coastal settlements (approximately AD 750-1400). Modern data came from fisheries near the archeological site and intensively harvested fishing grounds in southern Kenya. The areas we sampled that were closed to fishing (closures) were small (unsustainable fishing hypothesis. Fishes represented in the early midden assemblages from AD 750 to 950 had longer life spans, older age at maturity, and longer generation times than fish assemblages after AD 950, when the abundance of species with longer maximum body lengths increased. Changes in fish life histories during the historical period were, however, one-third smaller than differences between the historical and modern assemblages. Fishes in the modern assemblage had smaller mean body sizes, higher growth and mortality rates, a higher proportion of microinvertivores, omnivores, and herbivores, and higher rates of food consumption, whereas the historical assemblage had a greater proportion of piscivores and macroinvertivores. Differences in fish life histories between modern closures and modern fishing grounds were also small, but the life histories of fishes in modern closures were more similar to those in the midden before AD 950 because they had longer life spans, older age at maturity, and a higher proportion of piscivores and macroinvertivores than the modern fisheries. Modern closures and historical fish assemblages were considerably different, although both contained species with longer life spans. PMID:21676028

  7. Catch Chain

    OpenAIRE

    Talbert, Robert

    2010-01-01

    Catch Chain is a book of poems that traces the journey of a Corrections Officer who attempts to combat issues of isolation, inhumane treatment of inmates and societal rejection in jails by embarking upon a cross-country road trip. However, the same issues the officer initially wrestled with begin cropping up in different cities, on various highways and in a multitude of states. The excitement and adventure of the open road runs parallel to the recurring imprisonment of the guard's mind.

  8. 1996 fisheries statistics, Lake Kariba - Zimbabwe shore

    OpenAIRE

    Karenge, L.; Mugwagwa, M.

    1997-01-01

    The report provides catch records for the Kapenta and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1996. Kapenta usually constitute about 90% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. Whereas kapenta represent a unit stock which is harvested by both Zimbabwe and Zambia, the artisanal fishery exploits inshore species which generally occupy water less than ...

  9. 1995 fisheries statistics, Lake Kariba - Zimbabwe shore

    OpenAIRE

    Karenge, L.; Ncube, L.D.; Mugwagwa, M.

    1996-01-01

    The report provides catch records for the Kapenta and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1995. Kapenta usually constitute about 90% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. Whereas kapenta represent a unit stock which is harvested by both Zimbabwe and Zambia, the artisanal fishery exploits inshore species which generally occupy water less than ...

  10. 1994 fisheries statistics, Lake Kariba - Zimbabwe shore

    OpenAIRE

    Karenge, L.; Mugwagwa, M.; Muchabaiwa, L.D.

    1995-01-01

    The report provides catch records for the Kapenta and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1994. Kapenta usually constitute about 90% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. Whereas kapenta represent a unit stock which is harvested by both Zimbabwe and Zambia, the artisanal fishery exploits inshore species which generally occupy water less than ...

  11. By-catch composition of the Patagonian scallop fishery: the fishes Composición de la captura incidental en la pesquería de vieira patagónica: los peces

    Directory of Open Access Journals (Sweden)

    Laura Schejter

    2012-11-01

    Full Text Available An inventory of 24 fish species incidentally caught by the Patagonian scallop fleet in the SW Atlantic Ocean is provided for the first time. The most frequent species were Psammobatis spp. (81.4%, Bathyraja brachyurops (75.1%, B. macloviana (73.5%, Patagonotothen ramsayi (66.1%, Merluccius hubbsi (53.7% and B. albomaculata (50.3%. Many of the recorded chondrichthyes are considered vulnerable or endangered species. The number of taxa (fishes + invertebrates that conforms the by-catch of the fishery was increased and updated to nearly 200 species.Este estudio presenta por primera vez un inventario con 24 especies de peces registradas en la captura incidental de la pesca de la vieira patagónica en el Océano Atlántico sudoccidental por la flota pesquera comercial. Las especies más frecuentes fueron Psammobatis spp. (81,4%, Bathyraja brachyurops (75,1%, B. macloviana (73,5%, Patagonotothen ramsayi (66,1%, Merluccius hubbsi (53,7% y B. albomaculata (50,3%. Muchos de los condrictios registrados se encuentran actualmente considerados como especies vulnerables o en peligro. El número de taxa (peces + invertebrados que conforman la captura incidental de esta pesquería se incrementó y actualizó con estos resultados a aproximadamente 200 especies.

  12. Fishery of the Uçá Crab Ucides Cordatus (Linnaeus, 1763) in a Mangrove Area in Cananéia, State of São Paulo, Brazil: Fishery Performance, Exploitation Patterns and Factors Affecting the Catches

    OpenAIRE

    Luis Felipe de Almeida Duarte; Ricardo Santos Duran; Jocemar Tomasino Mendonça; Marcelo Antonio Amaro Pinheiro

    2014-01-01

    The fishery of the mangrove crab (Ucides cordatus) is one of the oldest sources of food, income and extractive activity in the estuarine systems of Brazil. The state of São Paulo has the largest population of any Brazilian state, and the city of Cananéia, in the Brazilian southeast has the highest recorded level of exploitation of the uçá-crab. Since 1990, this species has been under intense exploitation pressure due to the unauthorized use of a type of trap called 'redinha'. This type of fis...

  13. The influence of hook type, angler experience, and fish size on injury rates and the duration of capture in an Alaskan catch-and-release rainbow trout fishery

    Science.gov (United States)

    Meka, J.M.

    2004-01-01

    Owing to concerns about the high incidence of past hooking injuries in Alagnak River rainbow trout Oncorhynchus mykiss, fish were captured with spin- and fly-fishing gear with barbed and barbless circle and "J" hooks to determine gear types contributing to injury. Landing and hook removal times were measured for a portion of fish captured, and the anatomical hooking location, hooking scar locations, bleeding intensity, angler experience, and fish size were recorded for all captured fish. Approximately 62% of fish captured experienced at least one new hooking injury, and 29% of fish had at least one past hooking injury. Small fish sustained higher new injury and bleeding rates, but large fish had higher past injury rates. Injury rates were higher for barbed J hooks, barbed J hooks took longer to remove, and fish caught by spin-fishing were injured more frequently than fish caught by fly-fishing. Fewer fly-fishing-caught fish were injured using circle hooks, and circle hooks tended to hook fish in only one location, generally in the jaw. Barbed J hooks were more efficient at landing fish, and J hooks were more efficient at landing fish than circle hooks. Novice anglers injured proportionally more fish than experienced anglers, primarily during hook removal. Landing time was positively correlated with fish size, and experienced anglers took longer to land fish than novices because they captured larger fish. These results suggest that a reduction in hooking injuries may be achieved by using circle hooks as an alternative to J hooks and barbless J hooks to reduce injury and handling time, yet catch efficiency for both methods would be reduced. Although fish captured with barbless J hooks and circle hooks had fewer injuries, it is important to note that each hook type also caused significant injury, and angler education is recommended to promote proper hook removal techniques.

  14. A probability-based approach to setting annual catch levels.

    OpenAIRE

    Shertzer, Kyle W.; Prager, Michael H.; Williams, Erik H.

    2008-01-01

    The requirement of setting annual catch limits to prevent overfishing has been added to the Magnuson-Stevens Fishery Conservation and Management Reauthorization Act of 2006 (MSRA). Because this requirement is new, a body of applied scientific practice for deriving annual catch limits and accompanying targets does not yet exist. This article demonstrates an approach to setting levels of catch that is intended to keep the probability of future overfishing at a preset low level. The proposed fra...

  15. Shark Bycatch - Small Scale Tuna Fishery Interactions along the Kenyan Coast.

    OpenAIRE

    Kiilu, B.K.; Ndegwa, S.

    2013-01-01

    In Kenya and to a great extent most parts of the WIO region, shark catches majorly occur as by-catch in artisanal tuna fisheries and prawn trawls, including sport fishing activities. However, the extent to which these various fisheries catch sharks is not known but may be significant. The species structure, distribution, catch rates and levels of fisheries-shark interactions are not well documented. This information is, however, necessary to assess exploitation levels of shark spe...

  16. Where the waters meet: sharing ideas and experiences between inland and marine realms to promote sustainable fisheries management

    Science.gov (United States)

    Cooke, Steven J.; Arlinghaus, Robert; Bartley, Devin M.; Beard, T. Douglas; Cowx, Ian G.; Essington, Timothy E.; Jensen, Olaf P.; Lynch, Abigail J.; Taylor, William W.; Watson, Reg

    2014-01-01

    Although inland and marine environments, their fisheries, fishery managers, and the realm-specific management approaches are often different, there are a surprising number of similarities that frequently go unrecognized. We contend that there is much to be gained by greater cross-fertilization and exchange of ideas and strategies between realms and the people who manage them. The purpose of this paper is to provide examples of the potential or demonstrated benefits of working across aquatic boundaries for enhanced sustainable management of the world’s fisheries resources. Examples include the need to (1) engage in habitat management and protection as the foundation for fisheries, (2) rethink institutional arrangements and management for open-access fisheries systems, (3) establish “reference points” and harvest control rules, (4) engage in integrated management approaches, (5) reap conservation benefits from the link to fish as food, and (6) reframe conservation and management of fish to better engage the public and industry. Cross-fertilization and knowledge transfer between realms could be realized using environment-independent curricula and symposia, joint scientific advisory councils for management, integrated development projects, and cross-realm policy dialogue. Given the interdependence of marine and inland fisheries, promoting discussion between the realms has the potential to promote meaningful advances in managing global fisheries.

  17. 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.

  18. The Mekong Fish Network: expanding the capacity of the people and institutions of the Mekong River Basin to share information and conduct standardized fisheries monitoring

    Science.gov (United States)

    Patricio, Harmony C.; Ainsley, Shaara M.; Andersen, Matthew E.; Beeman, John W.; Hewitt, David A.

    2012-01-01

    The Mekong River is one of the most biologically diverse rivers in the world, and it supports the most productive freshwater fisheries in the world. Millions of people in the Lower Mekong River Basin (LMB) countries of the Union of Myanmar (Burma), Lao People’s Democratic Republic, the Kingdom of Thailand, the Kingdom of Cambodia, and the Socialist Republic of Vietnam rely on the fisheries of the basin to provide a source of protein. The Mekong Fish Network Workshop was convened in Phnom Penh, Cambodia, in February 2012 to discuss the potential for coordinating fisheries monitoring among nations and the utility of establishing standard methods for short- and long-term monitoring and data sharing throughout the LMB. The concept for this network developed out of a frequently cited need for fisheries researchers in the LMB to share their knowledge with other scientists and decisionmakers. A fish monitoring network could be a valuable forum for researchers to exchange ideas, store data, or access general information regarding fisheries studies in the LMB region. At the workshop, representatives from governments, nongovernmental organizations, and universities, as well as participating foreign technical experts, cited a great need for more international cooperation and technical support among them. Given the limited staff and resources of many institutions in the LMB, the success of the proposed network would depend on whether it could offer tools that would provide benefits to network participants. A potential tool discussed at the workshop was a user-friendly, Web-accessible portal and database that could help streamline data entry and storage at the institutional level, as well as facilitate communication and data sharing among institutions. The workshop provided a consensus to establish pilot standardized data collection and database efforts that will be further reviewed by the workshop participants. Overall, workshop participants agreed that this is the type of

  19. CROATIAN FISHERIES IN 2007

    Directory of Open Access Journals (Sweden)

    Ante Mišura

    2008-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. The total freshwater fish production in 2007 was 5,797 tons (4,151 tons of warm–water species and 1,646 tons of cold–water species. Total areas and production areas in 2007 was 5,558.66. Total catch of freshwater fish in 2007 was 697 tons. The total marine fish species production in 2007 was 4,000 tons, production of tuna 4,180 tons, mussels 3,000 tons and oysters 1,000,000 pieces. The catch of marine fish was increased by 6.09% comparing to 2006 (increase was noticed for white and blue fish species. During 2007 there were no significant changes regarding the number of commercial fishermen comparing to the last two years, while the number of small–scale fishermen increased 0.4 % comparing to the last year. The total production of fish products in 2007 was 15,349 tons, which is 11.6 % less comparing to 2006.

  20. 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.

  1. 78 FR 26171 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2013-05-03

    ... based on the 2012 TRAC assessment, and concluded that this ABC represented a status quo catch limit... 648 Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the Northeastern... Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Northeast...

  2. Composición de especies, tasas de captura y estructura de tamaño de peces capturados en la pesquería espinelera artesanal de rayas en la zona sur-austral de Chile Species composition, catch rates, and size structures of fishes caught in the small-scale longline skate fishery off southern Chile

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quiroz

    2008-01-01

    Full Text Available En los últimos diez años los desembarques de rayas en la pesquería espinelera artesanal se han incrementado aceleradamente en la zona sur-austral de Chile y actualmente se desconocen características fundamentales para la descripción de la dinámica poblacional, como es la composición de especies, tasas de capturas y estructura de tamaño. En este estudio se exploraron estas características mediante información biológico-pesquera obtenida en un programa de moni toreo experimental desarrollado entre febrero 2003 y agosto 2004. Se analizaron 403 lances de pesca donde se registró información operational (fecha, profundidad, tiempo de reposo, número de anzuelos, captura total y zona de pesca y biológica (identificación de especies, número de especies, peso, sexo y longitud total. Se examinó por zona de pesca la composición de un grupo de 16 especies correspondientes al 98% de la captura total. Las capturas estuvieron constituidas principalmente por raya volantín (Dipturus chilensis y congrio dorado (Genypterus blacodes, que en conjunto representaron el 87,8% de la captura total, mientras que la importancia del resto de las especies de elasmobranquios incidentales no superó el 9%. Adicionalmente, se obtuvo la estructura de tamaño y tasas de captura de congrio dorado y de las únicas dos especies de rajiformes reportadas en las capturas, raya volantín y raya espinuda (Dipturus trachyderma. En estas tres especies, la estructura de tamaño evidenció cambios significativos (p Landings of the small-scale longline skate fishery have increased rapidly off southern Chile during the last ten years. At present, the fundamental characteristics for describing the population dynamics (e.g., species composition, catch rates, size structures are not known. The present study explored these characteristics using biological-fishery information coming from an experimental sampling program carried out between February 2003 and August 2004. A total

  3. 50 CFR 679.32 - Groundfish and halibut CDQ catch monitoring.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Groundfish and halibut CDQ catch monitoring. 679.32 Section 679.32 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL... § 679.32, see the List of CFR Sections Affected, which appears in the Finding Aids section of...

  4. Guam Commercial Fisheries BioSampling (CFBS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Guam Commercial Fisheries Biosampling program, which collects length and weight frequency data for whole commercial catches, and samples 4-8 species for...

  5. More to fisheries than catch limits

    OpenAIRE

    CASEY JOHN; Martinsohn, Jann,; DOERNER Hendrik

    2016-01-01

    The Nature Editorial “Fishy limits” (Nature 528, 435 (24 December 2015) doi:10.1038/528435a) asserts that the European Union has set a worrying trend by ignoring scientific advice on overfishing. In doing so, the editorial tells only part of the story and misses important aspects.

  6. SIS - Annual Catch Limit

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Annual Catch Limit (ACL) dataset within the Species Information System (SIS) contains information and data related to management reference points and catch data.

  7. Managing Uncertainty for an Integrated Fishery

    OpenAIRE

    MB Hasan

    2012-01-01

    This paper investigates ways to deal with the uncertainties in fishing trawler scheduling and production planning in a quota-based integrated commercial fishery. A commercial fishery faces uncertainty mainly from variation in catch rate, which may be due to weather, and other environmental factors. The firm tries to manage this uncertainty through planning co-ordination of fishing trawler scheduling, catch quota, processing and labour allocation, and inventory control. Scheduling must necessa...

  8. 1997 fisheries statistics, Lake Kariba - Zimbabwe shore

    OpenAIRE

    Songore, N.; Mugwagwa, M.; Moyo, A.

    1998-01-01

    The report provides catch records for the kapenta (Limnothrissa miodon) and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1997. Kapenta usually constitute about 94% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. The kapenta, which occupy the open pelagic waters of the lake, represent a unit stock which is harvested by both Zimbabwe and Zambia; the artisanal fis...

  9. Summary of fishery statistics 1989

    OpenAIRE

    1990-01-01

    This fisheries report summarises developments of the year 1989 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are...

  10. Summary of fishery statistics 1990

    OpenAIRE

    1991-01-01

    This fisheries report summarises developments of the year 1990 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are...

  11. Summary of fishery statistics, 1982

    OpenAIRE

    1983-01-01

    This fisheries report summarises developments of the year 1982 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  12. Summary of fishery statistics, 1986

    OpenAIRE

    1987-01-01

    This fisheries report summarises developments of the year 1986 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  13. Summary of fishery statistics, 1983

    OpenAIRE

    1984-01-01

    This fisheries report summarises developments of the year 1983 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  14. Summary of fishery statistics, 1984

    OpenAIRE

    1985-01-01

    This fisheries report summarises developments of the year 1984 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  15. Summary of fishery statistics, 1981

    OpenAIRE

    1981-01-01

    This fisheries report summarises developments of the year 1981 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  16. Summary of fishery statistics, 1985

    OpenAIRE

    1986-01-01

    This fisheries report summarises developments of the year 1985 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  17. Summary of fishery statistics, 1980

    OpenAIRE

    1981-01-01

    This fisheries report summarises developments of the year 1980 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  18. Descarte de peixes na pesca comercial em Tefé, médio Solimões, Amazônia Central - DOI: 10.4025/actascibiolsci.v30i1.1471 Discarded catches from commercial fisheries in the middle Solimões river, Central Amazon region - DOI: 10.4025/actascibiolsci.v30i1.1471

    Directory of Open Access Journals (Sweden)

    Wuerles Bessa Barbosa

    2008-03-01

    Full Text Available Descartes são comuns na pesca comercial, sendo avaliados para apoiar o manejo da pesca na região. Por meio de acompanhamentos diários das pescarias da frota comercial de Tefé, foi descrito o descarte de pescado no médio Solimões. Utilizando análises de correlação e covariância, foram avaliados fatores que determinam o descarte com três modalidades distintas de pesca. Os pescadores selecionaram o pescado no momento da captura por espécie e tamanho. As espécies de pescados mais descartados foram jaraquis, tucunarés e branquinhas, porém os mais freqüentes, no descarte, foram espécies dos Siluriformes. Os apetrechos de pesca analisados apresentaram diferenças nas características de seu descarte. O descarte foi menor na enchente-cheia (5-17% da captura, conforme apetrecho que durante a vazante-seca (20-62%, conforme apetrechoDiscards are common in commercial fishery, and are evaluated in order to support fisheries management in the region. Fish discards in the middle Solimões River were described through daily monitoring of fishing activities by the commercial fleet of the town of Tefé. By making use of analyses of correlation and covariance, determinant factors for discards in three different types of fisheries were evaluated. The crew selected the fish at the moment of capture, by species and size. Among the most discarded fish species were silver prochilodus, peacock bass, and curimata inormata; however, the most frequently discarded were Siluriform species. The fishing gear analyzed featured differences in their discarding characteristics. Discard was lower during the flood period (5-17% of catches, depending on gear than during the dry season (20-62% of catches, depending on gear

  19. 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

    2016-05-01

    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

  20. Of Fish and Fishermen: Shifting Societal Baselines to Reduce Environmental Harm in Fisheries

    Directory of Open Access Journals (Sweden)

    Mimi E. Lam

    2012-12-01

    Full Text Available If reasonable fishery harvests and environmental harms are specified in new regulations, policies, and laws governing the exploitation of fish for food and livelihoods, then societal baselines can shift to achieve sustainable fisheries and marine conservation. Fisheries regulations can limit the environmental and social costs or harms caused by fishing by requiring the fishing industry to pay for the privilege to fish, via access fees for the opportunity to catch fish and extraction fees for fish caught; both fees can be combined with a progressive environmental tax to discourage overcapitalization and overfishing. Fisheries policies can be sustainable if predicated on an instrumental and ethical harm principle to reduce fishing harm. To protect the public trust in fisheries, environmental laws can identify the unsustainable depletion of fishery resources as ecological damage and a public nuisance to bind private fishing enterprises to a harm principle. Collaborative governance can foster sustainable fisheries if decision-making rights and responsibilities of marine stewardship are shared among government, the fishing industry, and civil society. As global food security and human welfare are threatened by accelerating human population growth and environmental impacts, decisions of how to use and protect the environment will involve collective choices in which all citizens have a stake - and a right.

  1. Trophic dynamics and fishery potentials of the Indian Occean - critical assessment

    Digital Repository Service at National Institute of Oceanography (India)

    Dalal, S.G.; Parulekar, A.H.

    A critical review of the status of the Indian Ocean marine fisheries reveals that the presently exploited annual catch is less than one third of the projected potentials as estimated from the biological productivity and exploratory fishery survey...

  2. 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%).

  3. Characterization and management of the commercial sector of the Pohnpei coral reef fishery, Micronesia

    Science.gov (United States)

    Rhodes, K. L.; Tupper, M. H.; Wichilmel, C. B.

    2008-06-01

    Commercial coral reef fisheries in Pohnpei (Micronesia) extract approximately 1,521 kg of reef fish daily (˜500 MT year-1) from 152 km2 of surrounding reef. More than 153 species were represented during surveys, with 25 species very common or common within combined-gear catch. Acanthurids contributed the greatest to catch volume, with bluespine unicornfish, Naso unicornis, and orangespine unicornfish, Naso lituratus, among the most frequently observed herbivores. Nighttime spearfishing was the dominant fishing method and inner lagoon areas were primarily targeted. A seasonal sales ban (March April), intended to reduce pressure on reproductively active serranids, significantly increased the capture volume of other families. Catch was significantly greater during periods of low lunar illumination, suggesting higher fishing success or greater effort, or both. The marketed catch was dominated by juveniles and small adults, based on fishes of known size at sexual maturity. Artificially depressed market prices appear to be catalyzing (potential or realized) overfishing by increasing the volume of fish needed to offset rising fuel prices. These results support the need for comprehensive fisheries management that produces sustainable fishing and marketing practices and promotes shared management and enforced responsibilities between communities and the state. To be effective, management should prohibit nighttime spearfishing.

  4. AFSC/FMA/NPRB Alternative Catch Monitoring Table and ccolumn Definitions

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data arise from a field study of groundfish catch monitoring in Kodiak, AK trawl fisheries. Two monitoring components were included in the study: 1) at-sea...

  5. Diversity, occurrence and socio-economic aspects of snappers and job fish (Family: Lutjanidae) fisheries from Gulf of Mannar region, south-east coast of India.

    Digital Repository Service at National Institute of Oceanography (India)

    Murugan, A.; Vinod, K.; Saravanan, K.R.; Anbalagan, T.; Saravanan, R.; Sanaye, S.V.; Mojjada, S.K.; Rajagopal, S.; Balasubramanian, T.

    for fishes caught from these fishing gears (trap, bottom set gill net and hook and line). The domestic village market is active for 3-4 hours and the time duration depend upon the fishing practices. The fisher mostly sells their catch to fish traders... varies since the selling of fishes is done by auction mode. The snappers like Lutjanus argentimaculatus, L. malabaricus, L. rivulatus and L. stellatus fetched good income when compared to other species. The sharing pattern of the fishery...

  6. CROATIAN FISHERIES IN 2006.

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2007-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (freshwater fish farming in 2005 there have been noticed production increase in coldwater fish species. The total freshwater fish production in 2006 was 6,328 tons (4,599 tons of warm–water species and 1,729 tons of cold–water species. Total areas and production areas were decreased comparing to 2005 in all categories of production areas. Total catch of freshwater fish in 2006 was 674 tons. The total marine fish species production in 2006 was 3,500 tons, production of tuna 6,700 tons, mussels 3,500 tons and oysters 1,000,000 pieces. The catch of marine fish was increased by 9.21% comparing to 2005 (increase was noticed for white and blue fish species. During 2006 there were no significant changes regarding the number of commercial fishermen comparing to the last two years, while the number of small–scale fishermen decreased 1% comparing to the last year. The total production of fish products in 2006 was 17,362 tons, which is 2.46% more comparing to 2005.

  7. Tragedy of the Commons Fisheries Management Simulation Game

    Science.gov (United States)

    Prothero, W. A.

    2011-12-01

    The goal of the "Fishing Game" is that students will understand some of the issues that occur when multiple stakeholders share, and profit from, common and finite resources. Garrett Hardin described this as "The Tragedy of the Commons." The global fisheries provide a timely example of the over-exploitation of a shared resource. The forests, our water supplies, and atmosphere are other examples of "commons" that we must manage effectively. The "Fishing Game" is loosely based on the "Fishbanks Game" of Dennis Meadows. The student plays against two virtual fishing companies in an effort to make as much money as possible, while exploring the management issues that arise when trying to sustain the fish population for future profits. The player selects each of four realistic management scenarios. These are 1) free for all, 2) limited fishing season, 3) marine reserves, and 4) catch shares. For each scenario the student makes decisions about how many ships to build and how many to send to each of two fishing areas. A simple population model works in the background to determine the catch and number of new fish that are added to the population through birth each year. The student sets the management parameters for each of the scenarios. A modeling tool is used to determine the optimum parameters for each management scenario. The player will quickly find that a single aggressive player whose profit motive trumps concern over the sustainability of the population will almost always win under all scenarios except the 4'th. When the season is limited, everybody fishes harder. With marine reserves, catches will drop, but the population will not disappear completely. Only catch shares sustain the population while providing reasonable long term profit for the fishing companies. For each management scenario, the player is asked a pre and a post play thought question. After all scenarios are played, the student can edit the post versions of the thought questions, plus several added

  8. Salmonid & freshwater Fisheries statistics England & Wales 1996

    OpenAIRE

    1997-01-01

    This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1996 produced by the Environment Agency in 1997. The principal aim of the Environment Agency in respect of fisheries is to maintain improve and develop fish stocks, the basic fisheries resource, in order to optimise the social and economic benefits from their sustainable exploitation. This report is the second collation of salmon and migratory trout catch statistics for England and Wales produced by the Environment Ag...

  9. CROATIAN FISHERIES IN 2004

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2005-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (freshwater fish farming in 2004 there have been noticed slight changes comparing to 2003. The total freshwater fish production in 2004 was 5,618 tons (4,259 tons of warm–water species and 1,359 tons of cold–water species. Total areas and production areas were increased comparing to 2003 (total areas 1.94% and production areas 5.42%. Total catch of freshwater fish in 2004 was 567 tons. The total marine fish species production was increased cca. 20% comparing to 2003. Mussels farming, which is slightly increasing since 1999, during 2004 was decreased, while oysters farming were stagnating. The catch of marine fish was increased by 9.74% comparing to 2003. The biggest increase is noticed regarding catch of demersal and other fish species. As well as the increase of the total catch, the number of commercial fishermen and fishing vessels was also increased in 2003. The number of fishermen who fish for their own consumption (without the right to sell fish–small scale fishermen in 2004 was 13,700. The total production of fish products in 2004 was 14,270 tons, which is 24.89% less comparing to 2003. Along this decrease, there has been also noticed an increasing trend of the production assortments, specially salted anchovy. The value of import in 2004 was higher than the value of export, although the export/import balance was higher in amount on the import side. Financial subventions payments in 2004 were 67.21% higher comparing to the first year of payments (1997

  10. Deriving acceptable biological catch from the overfishing limit: implications for assessment models

    OpenAIRE

    Prager, Michael H.; Shertzer, Kyle W.

    2010-01-01

    The recently revised Magnuson–Stevens Fishery Conservation and Management Act requires that U.S. fishery management councils avoid overfishing by setting annual catch limits (ACLs) not exceeding recommendations of the councils’ scientific advisers. To meet that requirement, the scientific advisers will need to know the overfishing limit (OFL) estimated in each stock assessment, with OFL being the catch available from applying the limit fishing mortality rate to current or projected stock b...

  11. The use of at‐sea‐sampling data to dissociate environmental variability in Norway lobster (Nephrops norvegicus) catches to improve resource exploitation efficiency within the Skagerrak/Kattegat trawl fishery

    DEFF Research Database (Denmark)

    Feekings, Jordan P.; Christensen, Asbjørn; Jonsson, Patrik;

    2015-01-01

    Research into the influence of environmental variables on the behaviour of Norway lobster (Nephrops norvegicus), and hence catch rates, dates back to the 1960s (e.g., Höglund and Dybern, Diurnal and seasonal variations in the catch‐composition of Nephrops norvegicus (L.) at the Swedish west coast...

  12. Sustainable use of flatfish resources: addressing the credibility crisis in miced fisheries management

    NARCIS (Netherlands)

    Rijnsdorp, A.D.; Daan, N.; Dekker, W.; Poos, J.J.; Densen, van W.L.T.

    2007-01-01

    Many flatfish species are caught in mixed demersal trawl fisheries and managed by Total Allowable Catch (TAC). Despite decades of fisheries management, several major stocks are severely depleted. Using the Common Fisheries Policy (CFP) as an example, the failure of mixed-fisheries management is anal

  13. Catch-In-Areas Main

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Catch-In-Areas database integrates catch data from the Catch Accounting System (which has the spatial resolution of a NMFS Reporting Area) into a database that...

  14. 76 FR 54739 - Pacific Halibut Fishery; Guideline Harvest Levels for the Guided Sport Fishery for Pacific...

    Science.gov (United States)

    2011-09-02

    ... NMFS' authority to take action at any time to limit the guided sport angler catch to the GHL (74 FR... the guided sport halibut fishery in Areas 2C and 3A on January 5, 2010 (75 FR 554). As of February 1... guided sport and commercial fisheries in Areas 2C and 3A (76 FR 44156). If approved by the Secretary...

  15. 78 FR 33020 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Amendment 5

    Science.gov (United States)

    2013-06-03

    ... time. Recognizing these funding challenges, the Council recommended status quo observer coverage levels... Fishery Management Plan (FMP). Amendment 5 was developed by the New England Fishery Management Council... sampling of catch at-sea; and address bycatch issues through responsible management. The proposed...

  16. 77 FR 67305 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-11-09

    ... that fishery to 3,165 mt (a 720-mt increase from status quo). Recently available data indicate that the... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Specifications and Management Measures... Management Plan. This action raises the butterfish acceptable biological catch (ABC) to 4,200 mt (from...

  17. 76 FR 11969 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Annual Specifications

    Science.gov (United States)

    2011-03-04

    ... decrease the future stock of the species, as well as harvest limits, thereby reducing future potential... States; Coastal Pelagic Species Fisheries; Annual Specifications AGENCY: National Marine Fisheries... this species on July 1, 2011. Vessels with Pacific sardine catch must be at shore and in the process...

  18. 50 CFR 648.53 - Target total allowable catch, DAS allocations, and individual fishing quotas.

    Science.gov (United States)

    2010-10-01

    ... allocations, and individual fishing quotas. 648.53 Section 648.53 Wildlife and Fisheries FISHERY CONSERVATION... Target total allowable catch, DAS allocations, and individual fishing quotas. (a) Target total allowable... include the TAC for all scallop vessels fishing in open areas and Sea Scallop Access Areas, but...

  19. Catch a Star!

    Science.gov (United States)

    2006-11-01

    ESO and the European Association for Astronomy Education are launching today the 2007 edition of 'Catch a Star!', their international astronomy competition for school students. Now in its fifth year, the competition offers students the chance to win a once-in-a-lifetime trip to ESO's flagship observatory in Chile, as well as many other prizes. Students are invited to 'become astronomers' and embark on a journey to explore the Universe. ESO PR Photo 42/06 The competition includes separate categories - 'Catch a Star Researchers' and 'Catch a Star Adventurers' - to ensure that every student, whatever their level, has the chance to enter and win exciting prizes. For the artistically minded, 'Catch a Star!' also includes an artwork competition, 'Catch a Star Artists'. "'Catch a Star!' offers a unique opportunity for students to learn more about astronomy and about the methods scientists use to discover new things about the Universe", said Douglas Pierce-Price, Education Officer at ESO. In teams, students choose an astronomical topic to study and produce an in-depth report. An important part of the project for 'Catch a Star Researchers' is to think about how ESO's telescopes or a telescope of the future can contribute to their investigations of the subject. As well as the top prize - a trip to one of ESO's observatory sites in Chile - visits to observatories in Germany, Austria and Spain, and many other prizes are also available to be won. 'Catch a Star Researchers' winners will be chosen by an international jury, and 'Catch a Star Adventurers' will be awarded further prizes by lottery. Entries for 'Catch a Star Artists' will be displayed on the web and winners chosen with the help of a public online vote. The first editions of 'Catch a Star!' have attracted several hundred entries from more than 25 countries worldwide. Previous winning entries have included "Star clusters and the structure of the Milky Way" (Budapest, Hungary), "Vega" (Acqui Terme, Italy) and "Venus

  20. 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...

  1. Total catch of a red-listed marine species is an order of magnitude higher than official data.

    Science.gov (United States)

    Kleiven, Alf Ring; Olsen, Esben Moland; Vølstad, Jon Helge

    2012-01-01

    Accurate information on total catch and effort is essential for successful fisheries management. Officially reported landings, however, may be underestimates of total catch in many fisheries. We investigated the fishery for the nationally red-listed European lobster (Homarus gammarus) in south-eastern Norway. Probability-based strip transect surveys were used to count buoys in the study area in combination with catch per unit effort data obtained independently from volunteer catch diaries, phone interviews, and questionnaires. We estimate that recreational catch accounts for 65% of total catch in the study area. Moreover, our results indicate that only a small proportion (24%) of lobsters landed commercially were sold through the legal market and documented. Total estimated lobster catch was nearly 14 times higher than reported officially. Our study highlights the need for adequate catch monitoring and data collection efforts in coastal areas, presents a clear warning to resource managers that illegal, unreported and unregulated (IUU) fisheries in coastal areas should not be ignored, and shows the potential impact of recreational fisheries. PMID:22363583

  2. Total catch of a red-listed marine species is an order of magnitude higher than official data.

    Directory of Open Access Journals (Sweden)

    Alf Ring Kleiven

    Full Text Available Accurate information on total catch and effort is essential for successful fisheries management. Officially reported landings, however, may be underestimates of total catch in many fisheries. We investigated the fishery for the nationally red-listed European lobster (Homarus gammarus in south-eastern Norway. Probability-based strip transect surveys were used to count buoys in the study area in combination with catch per unit effort data obtained independently from volunteer catch diaries, phone interviews, and questionnaires. We estimate that recreational catch accounts for 65% of total catch in the study area. Moreover, our results indicate that only a small proportion (24% of lobsters landed commercially were sold through the legal market and documented. Total estimated lobster catch was nearly 14 times higher than reported officially. Our study highlights the need for adequate catch monitoring and data collection efforts in coastal areas, presents a clear warning to resource managers that illegal, unreported and unregulated (IUU fisheries in coastal areas should not be ignored, and shows the potential impact of recreational fisheries.

  3. The impact of artisanal fishery on a tropical intertidal benthic fish community

    NARCIS (Netherlands)

    de Boer, WF; van Schie, AMP; Jocene, DF; Mabote, ABP; Guissamulo, A

    2001-01-01

    We examined the benthic fishes and artisanal fishery in the intertidal flats of Inhaca Island, Mozambique. Results of a questionnaire indicated that catches had decreased, and that piscivorous fish have disappeared. Results of a catch sampling study indicated that current catch rates are low, <2 kg

  4. Leadership, social capital and incentives promote successful fisheries.

    Science.gov (United States)

    Gutiérrez, Nicolás L; Hilborn, Ray; Defeo, Omar

    2011-02-17

    One billion people depend on seafood as their primary source of protein and 25% of the world's total animal protein comes from fisheries. Yet a third of fish stocks worldwide are overexploited or depleted. Using individual case studies, many have argued that community-based co-management should prevent the tragedy of the commons because cooperative management by fishers, managers and scientists often results in sustainable fisheries. However, general and multidisciplinary evaluations of co-management regimes and the conditions for social, economic and ecological success within such regimes are lacking. Here we examine 130 co-managed fisheries in a wide range of countries with different degrees of development, ecosystems, fishing sectors and type of resources. We identified strong leadership as the most important attribute contributing to success, followed by individual or community quotas, social cohesion and protected areas. Less important conditions included enforcement mechanisms, long-term management policies and life history of the resources. Fisheries were most successful when at least eight co-management attributes were present, showing a strong positive relationship between the number of these attributes and success, owing to redundancy in management regulations. Our results demonstrate the critical importance of prominent community leaders and robust social capital, combined with clear incentives through catch shares and conservation benefits derived from protected areas, for successfully managing aquatic resources and securing the livelihoods of communities depending on them. Our study offers hope that co-management, the only realistic solution for the majority of the world's fisheries, can solve many of the problems facing global fisheries.

  5. 热带大西洋金枪鱼延绳钓兼捕鲨鱼种类组成和渔获率及其与表温的关系%Species composition and catch rate of bycatch sharks captured by tuna longline fishery and their relationship with sea surface temperature in the tropical Atlantic Ocean

    Institute of Scientific and Technical Information of China (English)

    姜润林; 戴小杰; 许柳雄

    2009-01-01

    根据2007年12月~2008年3月采集的热带大西洋(05°37′~12°01′N、29°00′~36°51′W)金枪鱼延绳钓渔获物数据,分析了金枪鱼延绳钓兼捕鲨鱼的种类组成、渔获量、渔获率及其与表温的关系.本次调查共捕获鲨鱼8种,隶属3目7科7属, 总渔获尾数为633 ind,总渔获量达26 837.4 kg, 其中大青鲨为主要兼捕种类.各种鲨鱼渔获率平均值在0.003~1.524 ind/1 000 hooks之间, 其中大青鲨最高, 其值为1.524 ind/1 000 hooks,大眼砂锥齿鲨最低,其值为0.003 ind/1 000 hooks.各种鲨鱼渔获率月变化不明显(ANOVA, P=0.901).鲨鱼总渔获率和大青鲨渔获率与表温都呈显著性负相关.大青鲨主要出现渔场的表温范围为24.6~25.8 ℃.%Based on catch data collected in the tropical Atlantic Ocean (05°37′N-12°01′N, 29°00′W-36°51′W) from December 2007 to March 2008, the species composition, catch, catch rate of bycatch sharks captured by tuna longline fishery and their relationship with sea surface temperature (SST) are analyzed. Altogether 633 individuals of fish are captured, which belong to 3 orders, 7 families, 7 genera and 8 fish species. The total weight of bycatch sharks is 26837.4kg. And the dominant bycatch shark is blue shark ( Prionace glauca ). Average catch rate of bycatch sharks is 0.003-1.524 individual per 1 000 hooks, of which blue shark is the highest, 1.524 individual per 1 000 hooks, and bigeye sand shark( Odontaspis noronhai ) lowest, 0.003 individual per 1 000 hooks. Catch rate of bycatch sharks shows no obvious monthly fluctuation (ANOVA, P=0.901). An obvious negative correlation is found between SST and catch rate of total bycatch shark and blue shark. The range of SST in the dominant fishing ground where blue sharks appear is 24.6-25.8℃.

  6. Fisheries and Management Status of Pechiparai Reservoir in Tamil Nadu

    Directory of Open Access Journals (Sweden)

    C. Lloyd Chrispin1,

    2016-04-01

    Full Text Available The study attempts to give a comprehensive account of socio-economic and ecological aspects of the fisheries and management in Pechiparai reservoir of Kanyakumari district, Tamil Nadu by analysing the data obtained both using primary and from secondary sources. It is unique in terms of demographics - sparsely populated reservoir periphery, very low primary productivity, relatively less diversity in fish species and a typical institutional arrangement for benefit sharing and marketing (share system. Increase in fish seed stocking and fishing effort through share fishing system has increased the total fish catch of the reservoir from an average of 3.5 kg/hectare/year (1962-1980 to an average of 13 kg/hectare/year (1981 to 2015 due to considerable contribution by stocked varieties especially Indian Major Carps. However, regression analysis revealed that there is no significant relationship between fish seed stocking and fish catch in the reservoir. Underlining the limitations of present stock enhancement program, the study emphasises the possibilities of eco-tourism and sport fishing, for creating sustainable livelihoods based on further detailed scientific investigations on the socio-ecology of the reservoir region.

  7. Mitigating by-catch of diamondback terrapins in crab pots

    Science.gov (United States)

    Hart, Kristen M.; Crowder, Larry B.

    2011-01-01

    Chronic by-catch of diamondback terrapins (Malaclemys terrapin) in blue crab (Callinectes sapidus) pots is a concern for terrapin conservation along the United States Atlantic and Gulf of Mexico coasts. Despite the availability of by-catch reduction devices (BRDs) for crab pots, adoption of BRDs has not been mandated and by-catch of terrapins continues. We conducted experimental fishing studies in North Carolina's year-round blue crab fishery from 2000 to 2004 to evaluate the ability of various BRDs to reduce terrapin by-catch without a concomitant reduction in the catch of blue crabs. In 4,822 crab pot days fished, we recorded only 21 terrapin captures. Estimated capture rates were 0.003 terrapins/pot per day in hard crab experimental fishing and 0.008 terrapins/pot per day in peeler experimental fishing. All terrapin captures occurred from April to mid-May within 321.4 m of the shoreline. Longer soak times produced more dead terrapins, with 4 live and 4 dead during hard crab experimental fishing and 11 live and 2 dead during peeler experimental fishing. The 4.0-cm BRDs in fall and 4.5-cm and 5.0-cm BRDs in spring reduced the catch of legal-sized male hard crabs by 26.6%, 21.2%, and 5.7%, respectively. Only the 5.0-cm BRDs did not significantly affect the catch of legal-sized hard male crabs. However, BRDs had no measurable effect on catch of target crabs in the peeler crab fishery. Our results identify 3 complementary and economically feasible tools for blue crab fishery managers to exclude terrapins from commercially fished crab pots in North Carolina: 1) gear modifications (e.g., BRDs); 2) distance-to-shore restrictions; and 3) time-of-year regulations. These measures combined could provide a reduction in terrapin by-catch of up to 95% without a significant reduction in target crab catch.

  8. 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.

  9. Estimates of total fisheries removal for the Balearic Isalands (1950-2010)

    OpenAIRE

    M. Carreras; Coll, Marta; Quetglas, A.; Goni, R.; Pastor, X.; Cornax, M.J.; Iglesia, M.; Massuti, E.; Oliver, P; Aguilar, R.; Au, A.; Zylich, K.; Pauly, D

    2015-01-01

    For effective fisheries management to be able to act, realistic fisheries removal data are needed, so as to assess exploitation levels and the impact of fisheries on the ecosystem. Unfortunately, official statistics underestimate catches in most countries and regions. In the Balearic Islands (Western Mediterranean), where artisanal fishing and industrial bottom trawling are the most important fishing activities, unreported catches are common. They consist of landings at ‘black market...

  10. Characteristics of the shark fisheries of Fiji

    OpenAIRE

    Glaus, Kerstin B. J.; Irene Adrian-Kalchhauser; Patricia Burkhardt-Holm; White, William T.; Juerg M. Brunnschweiler

    2015-01-01

    Limited information is available on artisanal and subsistence shark fisheries across the Pacific. The aim of this study was to investigate Fiji’s inshore fisheries which catch sharks. In January and February 2013, 253 semi-directive interviews were conducted in 117 villages and at local harbours on Viti Levu, Vanua Levu, Taveuni, Ovalau and a number of islands of the Mamanuca and Yasawa archipelagos. Of the 253 interviewees, 81.4% reported to presently catch sharks, and 17.4% declared that th...

  11. Catch composition of the EU pelagic fleet in Mauritania during the year 2002: results of the Scientific Observer Program

    NARCIS (Netherlands)

    Hofstede, ter R.

    2003-01-01

    This report describes the total catches of the EU pelagic fleet in the Mauritanian Exclusive Economic Zone during the year 2002. Data have been obtained by the 'Scientific Observer Program', which monitors the catch (both landings and discards) of the EU fishery for small pelagics in Mauritania. The

  12. Research progress in application of mean trophic level of catch in assessing fishery sustainability%渔获物平均营养级在渔业可持续性 评价中的应用研究进展

    Institute of Scientific and Technical Information of China (English)

    丁琪; 陈新军; 李纲; 方舟

    2016-01-01

    Owing to the high levels of fishing efforts and ineffective fishery management,traditional fishery resources have been collapsing all over the world.As an ecosystem-based approach,the indicator of mean trophic level of fisheries catches (MTL)uses readily available data and is quick and easy to calculate.In addition,MTL is very sensitive to the dynamics of fish community.MTL has been widely used to assess the impact of fishing by many international bodies,including the Convention on Biological Diversity,European Union,and Caribbean Large Marine Ecosystem and Adjacent Project.The paper reviewed research progress of MTL as an indicator of fishery sustainability based on extensive collection of related literatures at home and abroad .Analysis showes that MTL is a promising tool to assess fishery sustainability,and there are at least two ways to lead a decreasing MTL trend.The first is through the sequential replacement of long-lived,high trophic level species with short-lived,low trophic level species as the former are depleted to economic extinction,it is termed"fishing down marine food webs";the second is through the sequential addition of low trophic level fisheries within an ecosystem,and it is called"fishing through marine food webs".Besides,the underlying ecological effects associated with different mechanisms showed significant differences,and different governance responses should be employed for each mechanism.Considering the factors of using landing data as ecosystem indicators,trophic level changing with body length,quality of fishery statistics data,harvesting too much low TL species and eutrophication,we should combine MTL with other trophic indicators such as cutMTL and FIB (Fishing-in-balance)index to provide a whole analysis.Furthermore,intergrating trophic indicators with other indexes such as catch composition,pelagic(P)to demersal(D)fish biomass ratio (P/D index)in fishery landings and market price will contribute to determining the cause of changing

  13. CROATIAN FISHERIES IN 2005

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2006-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (freshwater fish farming in 2005. there have been noticed slight production increase (both warmwater and coldwater fish species. The total freshwater fish production in 2005. was 6,199 tons (4,776 tons of warm–water species and 1,423 tons of cold–water species. Total areas and production areas were decreased comparing to 2004. (in all categories of production areas except for consum–fish production areas, where a slight increase has been noticed. Total catch of freshwater fish in 2005. was 656 tons. The total marine fish species production in 2005. was 3,000 tons, production of tuna 4,000 tons, mussels 2,500 tons and oysters 800,000 pieces. In mariculture sector there has been noticed the biggest increase in fish–fry production (43.39% comparing to 2004., in 2005. it was 10,000,000 pieces. The catch of marine fish was increased by 8.50% comparing to 2004. (increase was noticed for white and blue fish species. During 2005. there were no significant changes regarding the number of commercial fishermen comparing to the last two years, while the number of small–scale fishermen decreased 3.80% comparing to the last year. The total production of fish products in 2005. as 16,945 tons, which is 31.65% more comparing to 2004. In this sector the most significant is the increase of salted fish production, which was 56.11% more than 2004. The value of import in 2005. was higher than the value of export, which represents the only exception in last decade. The

  14. On the management of a tropical reservoir fishery.

    NARCIS (Netherlands)

    Pet, J.S.

    1995-01-01

    The major factor in the development of Sri Lankan inland fisheries was the introduction, in 1952, of the exotic cichlid Oreochromis mossambicus (Peters) which dominated the catch ever since. The most important water bodies for the inland fisheries are the larger (>100 ha) man-made reservoirs in the

  15. Monitoring fisheries in data-limited situations : a case study of the artisanal reef fisheries of Eritrea

    NARCIS (Netherlands)

    Tsehaye, I.W.

    2007-01-01

    Elucidating trends in catch rate and composition is important to evaluate the impact of fishing on fish stocks, and thereby guide fisheries management action. Since major changes in fish community structure can take place even at the initial stages in the development of fisheries, the onset of reef

  16. Catch Hilton Beijing

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Ready to spice up Beijing's nightlife? Come on to Zeta Bars, Hilton! If sneak previews are anything to go by, it's clear that The Third Ring will consistently perform to sellout crowds keen to catch a glimpse of the stunningly redesigned restaurants and bars that line the tri-level

  17. Profitability of Small-Scale Fisheries in Elmina, Ghana

    Directory of Open Access Journals (Sweden)

    Isaac Okyere

    2012-10-01

    Full Text Available In order to achieve sustainable fishing livelihoods in coastal communities, data on profitability of small-scale fisheries relative to fish species caught and gear types used by fishermen is required as part of a broader fisheries management strategy. This study was undertaken with this in mind. Interviews were conducted among 60 fishermen between February and March 2010. Economic assessment of small-scale fishing activities were done using questionnaires based on direct market pricing and contingent valuation methods. The results indicate that highly profitable fish species include Epinephelus aeneus, Sparus caeruleostictus, Dentex angolensis and Lutjanus goreensis valued at US$2.97, US$2.87, US$2.85 and US$2.63 per kilogram respectively. The less profitable species include Dasyatis margarita, Caranx crysos and Sardinella aurita valued at US$0.34, US$0.66 and US$ 0.85 per kilogram respectively. Although Sardinella aurita was among the less valuable fish species, it was the main species driving profits for the fishermen due to its high share volume among the fish catches. Findings from this study suggest high rates of exploitation, in that stocks generally cannot provide for increased economic return in the face of increased investment. This is a clear indicator that the open-access nature of Ghanaian fisheries is not sustainable, and management reform is well overdue.

  18. Summary of fishery statistics, 1987

    OpenAIRE

    1988-01-01

    This fisheries report summarises developments of the year 1987 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the Riv...

  19. Summary of fishery statistics, 1988

    OpenAIRE

    1989-01-01

    This fisheries report summarises developments of the year 1988 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the Riv...

  20. Summary of fishery statistics, 1979

    OpenAIRE

    1980-01-01

    This fisheries report summarises developments of the year 1979 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

  1. Keeping Food on the Table: Human Responses and Changing Coastal Fisheries in Solomon Islands.

    Directory of Open Access Journals (Sweden)

    Simon Albert

    Full Text Available Globally the majority of commercial fisheries have experienced dramatic declines in stock and catch. Likewise, projections for many subsistence fisheries in the tropics indicate a dramatic decline is looming in the coming decades. In the Pacific Islands coastal fisheries provide basic subsistence needs for millions of people. A decline in fish catch would therefore have profound impacts on the health and livelihoods of these coastal communities. Given the decrease in local catch rates reported for many coastal communities in the Pacific, it is important to understand if fishers have responded to ecological change (either by expanding their fishing range and/or increasing their fishing effort, and if so, to evaluate the costs or benefits of these responses. We compare data from fish catches in 1995 and 2011 from a rural coastal community in Solomon Islands to examine the potentially changing coastal reef fishery at these time points. In particular we found changes in preferred fishing locations, fishing methodology and catch composition between these data sets. The results indicate that despite changes in catch rates (catch per unit effort between data collected in 2011 and 16 years previously, the study community was able to increase gross catches through visiting fishing sites further away, diversifying fishing methods and targeting pelagic species through trolling. Such insight into local-scale responses to changing resources and/or fisheries development will help scientists and policy makers throughout the Pacific region in managing the region's fisheries in the future.

  2. Keeping Food on the Table: Human Responses and Changing Coastal Fisheries in Solomon Islands.

    Science.gov (United States)

    Albert, Simon; Aswani, Shankar; Fisher, Paul L; Albert, Joelle

    2015-01-01

    Globally the majority of commercial fisheries have experienced dramatic declines in stock and catch. Likewise, projections for many subsistence fisheries in the tropics indicate a dramatic decline is looming in the coming decades. In the Pacific Islands coastal fisheries provide basic subsistence needs for millions of people. A decline in fish catch would therefore have profound impacts on the health and livelihoods of these coastal communities. Given the decrease in local catch rates reported for many coastal communities in the Pacific, it is important to understand if fishers have responded to ecological change (either by expanding their fishing range and/or increasing their fishing effort), and if so, to evaluate the costs or benefits of these responses. We compare data from fish catches in 1995 and 2011 from a rural coastal community in Solomon Islands to examine the potentially changing coastal reef fishery at these time points. In particular we found changes in preferred fishing locations, fishing methodology and catch composition between these data sets. The results indicate that despite changes in catch rates (catch per unit effort) between data collected in 2011 and 16 years previously, the study community was able to increase gross catches through visiting fishing sites further away, diversifying fishing methods and targeting pelagic species through trolling. Such insight into local-scale responses to changing resources and/or fisheries development will help scientists and policy makers throughout the Pacific region in managing the region's fisheries in the future. PMID:26158694

  3. 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....

  4. Improving the size- and species selectivity of cod (Gadus morhua) in demersal mixed-species trawl fisheries

    DEFF Research Database (Denmark)

    Krag, Ludvig Ahm

    reduce the catch of cod without simultaneously reduce the catch of the target species. To optimise the trade-off between discard and loss of marketable catch, solutions have to be specific to particular fisheries or populations of fish. Papers 1 and 3 provide specific examples of how size- and species...

  5. 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...... 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...... 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...

  6. A cost-benefit analysis of improving trawl selectivity in the case of discards: The Nephrops norvegicus fishery in the Bay of Biscay

    OpenAIRE

    Macher, Claire; Guyader, Olivier; Talidec, Catherine; Bertignac, Michel

    2008-01-01

    The Nephrops trawl fishery is one of the most important fisheries in the Bay of Biscay. The fishery management essentially relies on conservation measures, a total at I owed catch (TAC) for Nephrops together with a mini mum landing size (MLS) and minimum trawl mesh size (70 mm stretched mesh). These measures have failed to prevent high discard levels of many species that characterize the fishery. Nephrops trawlers thus discard about half of their Nephrops catches in numbers (a third in weight...

  7. Cockles in custody: the role of common property arrangements in the ecological sustainability of mangrove Fisheries on the Ecuadorian Coast

    Directory of Open Access Journals (Sweden)

    Christine M. Beitl

    2011-09-01

    Full Text Available Scholars of common property resource theory (CPR have long asserted that certain kinds of institutional arrangements based on collective action result in successful environmental stewardship, but feedback and the direct link between social and ecological systems remains poorly understood. This paper investigates how common property institutional arrangements contribute to sustainable mangrove fisheries in coastal Ecuador, focusing on the fishery for the mangrove cockle (Anadara tuberculosa and A. similis, a bivalve mollusk harvested from the roots of mangrove trees and of particular social, economic, and cultural importance for the communities that depend on it. Specifically, this study examines the emergence of new civil society institutions within the historical context of extensive mangrove deforestation for the expansion of shrimp farming, policy changes in the late 1990s that recognized “ancestral” rights of local communities to mangrove resources, and how custodias, community-managed mangrove concessions, affect the cockle fishery. Findings from interviews with shell collectors and analysis of catch-per-unit-effort (CPUE indicate that mangrove concessions as common property regimes promote community empowerment, local autonomy over resources, mangrove conservation and recovery, higher cockle catch shares, and larger shell sizes, but the benefits are not evenly distributed. Associations without custodias and independent cockle collectors feel further marginalized by the loss of gathering grounds, potentially deflecting problems of overexploitation to “open-access” areas, in which mangrove fisheries are weakly managed by the State. Using Ostrom’s Institutional Analysis and Development (IAD framework, the explicit link between social and ecological systems is studied at different levels, examining the relationship between collective action and the environment through quantitative approaches at the fishery level and qualitative

  8. Reconciling single-species TACs in the North Sea demersal fisheries using the Fcube mixed-fisheries advice framework

    DEFF Research Database (Denmark)

    Ulrich, Clara; Reeves, Stuart A.; Vermard, Youen;

    2011-01-01

    catch potentials for distinct fleets (groups of vessels) and métiers (type of activity), and hence quantifying the risks of over- and underquota utilization for the various stocks. This method, named Fcube (Fleet and Fisheries Forecast), was applied successfully to international demersal fisheries......Single-species management is a cause of discarding in mixed fisheries, because individual management objectives may not be consistent with each other and the species are caught simultaneously in relatively unselective fishing operations. As such, the total allowable catch (TAC) of one species may...... in the North Sea and shaped into the advice framework. The substantial overquota catches of North Sea cod likely under the current fisheries regimes are quantified, and it is estimated that the single-species management targets for North Sea cod cannot be achieved unless substantial reductions in TACs of all...

  9. Management implications of the biodiversity and socio-economic impacts of shrimp trawler by-catch in Bahía de Kino, Sonora, México.

    Science.gov (United States)

    Meltzer, Lorayne; Blinick, Naomi S; Fleishman, Abram B

    2012-01-01

    The shrimp fishery is the most economically important fishery in Mexico. The trawler-based portion of this fishery results in high rates of by-catch. This study quantifies and describes the biodiversity of by-catch associated with trawling in the Bahía de Kino region of Sonora, Mexico. Data were collected from 55 trawls, on six boats, over 14 nights, during November of 2003, 2004, 2006-2009. By-catch rates within trawl samples averaged 85.9% measured by weight. A total of 183 by-catch species were identified during the course of this study, including 97 species of bony fish from 43 families, 19 species of elasmobranchs from 12 families, 66 species of invertebrates from eight phyla, and one species of marine turtle; seven of the documented by-catch species are listed on the IUCN Red List, CITES, or the Mexican NOM-059-ECOL-2010; 35 species documented in the by-catch are also targeted by local artisanal fishers. Some of the species frequently captured as juveniles in the by-catch are economically important to small-scale fishers in the region, and are particularly sensitive to overexploitation due to their life histories. This study highlights the need for further research quantifying the impacts of high levels of by-catch upon small-scale fishing economies in the region and presents strong ecological and economic rationale for by-catch management within the shrimp fishery of the Gulf of California. Site-specific by-catch management plans should be piloted in the Bahía de Kino region to address the growing momentum in national and international fisheries policy regimes toward the reduction of by-catch in shrimp fisheries.

  10. How flowers catch raindrops

    OpenAIRE

    Amador, Guillermo; Yamada, Yasukuni; Hu, David

    2011-01-01

    Several species of plants have raindrop-sized flowers that catch raindrops opportunistically in order to spread their 0.3-mm seeds distances of over 1 m. In the following fluid dynamics video, we show examples of these plants and some of the high speed videography used to visualize the splash dynamics responsible for raindrop-driven seed dispersal. Experiments were conducted on shape mimics of the plants' fruit bodies, fabricated using a 3D printer. Particular attention was paid to optimizing...

  11. Caracterización preliminar de los invertebrados bentónicos capturados accidentalmente en la pesca de camarones en el norte del estado de Río de Janeiro, sudeste de Brasil Preliminary characterization of benthic invertebrates caught as by-catch in the shrimp fishery in the north of the Rio de Janeiro State, southeastern Brazil

    Directory of Open Access Journals (Sweden)

    Igor David da Costa

    2009-01-01

    Full Text Available Para caracterizar la biodiversidad de invertebrados bentónicos que componen la fauna asociada a la pesca de camarones en el puerto del Farol de Sao Thomé, costa norte del estado de Río de Janeiro, se realizaron 11 pescas mensuales en el año 2004 con redes de arrastre de fondo, cuya área de operaciones comprende 3-5 mn desde la línea de costa, entre 22°00'S y 22°20'S. Los datos registrados de cada taxon y/o especie se refieren a la frecuencia de ocurrencia, frecuencia numérica, biomasa, índice de Importancia Relativa y abundancia. En total se registraron 27 especies de invertebrados bentónicos de Porifera, Cnidaria, Mollusca, Annelida, Crustácea, Echinodermata y Bryozoa. Crustácea fue el más representativo, tanto en número de ejemplares de Petrochirus diogenes, Hepatus pudibundus y Callinectes ornatos, como en biomasa de P. diogenes y H. pudibundas. En términos de frecuencia de ocurrencia en los muéstreos, 11 especies (40,7% fueron constantes; 6 (22,2% accesorias y 10 (37,0% accidentales.In order to characterize the biodiversity of the benthic invertebrate by-catch associated with the shrimp fishery at Farol de Sao Thome harbor, northern Rio de Janeiro State, Brazil, in 2004, 11 monthly trawls were conducted using bottom trawl nets between 22°00'S and 22°20'S and from 3 to 5 nm from the shoreline. The analyzed data for each talon and/or species include frequency of occurrence, numeric frequency, biomass, index of Relative Importance, and abundance. In total, 27 benthic invertebrate species were recorded, including Peripheral, Cnidarians, Mollusk, Annelid, Crustacea, Echinodermata, and Bryozoa. The most representative group was Crustacea, both in number of specimens (Petrochirus diogenes, Hepatus pudibundus, Callinectes ornatus and in biomass (P. diogenes, H. pudibundus. In terms of the frequency of occurrence in the samples, 11 species (40.7% were constant, 6 species (22.2% were accessories, and 10 species (37.0% were by-catch.

  12. A Bird’s Eye View of Discard Reforms: Bird-Borne Cameras Reveal Seabird/Fishery Interactions

    OpenAIRE

    Votier, Stephen C.; Bicknell, Anthony; Cox, Samantha L.; Scales, Kylie L.; Patrick, Samantha C

    2013-01-01

    Commercial capture fisheries produce huge quantities of offal, as well as undersized and unwanted catch in the form of discards. Declines in global catches and legislation to ban discarding will significantly reduce discards, but this subsidy supports a large scavenger community. Understanding the potential impact of declining discards for scavengers should feature in an eco-system based approach to fisheries management, but requires greater knowledge of scavenger/fishery interactions. Here w...

  13. Trolling may intensify exploitation in crappie fisheries

    Science.gov (United States)

    Meals, K. O.; Dunn, A. W.; Miranda, Leandro E.

    2012-01-01

    In some parts of the USA, anglers targeting crappies Pomoxis spp. are transitioning from mostly stationary angling with a single pole around submerged structures to using multiple poles while drifting with the wind or under power. This shift in fishing methods could result in a change in catch efficiency, possibly increasing exploitation rates to levels that would be of concern to managers. We studied the catch statistics of anglers fishing while trolling with multiple poles (trollers) and those fishing with single poles (polers) in Mississippi reservoirs. Specifically, we tested whether (1) various catch statistics differed between trollers and polers, (2) catch rates of trollers were related to the number of poles fished, and (3) trollers could raise exploitation rates to potentially unsustainable levels. Results showed that participation in the crappie fisheries was about equally split between polers and trollers. In spring, 90% of crappie anglers were polers; in summer, 85% of crappie anglers were trollers. The size of harvested crappies was similar for the two angler groups, but the catch per hour was almost three times higher for trollers than for polers. Catch rates by trollers were directly correlated to the number of poles fished, although the relationship flattened as the number of poles increased. The average harvest rate for one troller fishing with three poles was similar to the harvest rate obtained by one poler. Simulations predicted that at the existing mix of about 50% polers and 50% trollers and with no restrictions on the number of poles used by trollers, exploitation of crappies is about 1.3 times higher than that in a polers-only fishery; under a scenario in which 100% of crappie anglers were trollers, exploitation was forecasted to increase to about 1.7 times the polers-only rate. The efficiency of trolling for crappies should be of concern to fishery managers because crappie fisheries are mostly consumptive and may increase exploitation

  14. Behavioral inferences from the statistical distribution of commercial catch: patterns of targeting in the landings of the Dutch beam trawler fleet

    NARCIS (Netherlands)

    Gillis, D.M.; Rijnsdorp, A.D.; Poos, J.J.

    2008-01-01

    The objective identification of targeting behavior in multispecies fisheries is critical to the development and evaluation of management measures. Here, we illustrate how the statistical distribution of commercial catches can provide information on species preference that is consistent with economic

  15. 75 FR 51001 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Snapper and Grouper Off the...

    Science.gov (United States)

    2010-08-18

    ..., and South Atlantic; Snapper and Grouper Off the Southern Atlantic States AGENCY: National Marine... catch and discard mortality within the South Atlantic commercial hook-and-line snapper-grouper fishery... CFR 622 implementing the Fishery Management Plan for the Snapper-Grouper Fishery of the South...

  16. Projected change in global fisheries revenues under climate change.

    Science.gov (United States)

    Lam, Vicky W Y; Cheung, William W L; Reygondeau, Gabriel; Sumaila, U Rashid

    2016-09-07

    Previous studies highlight the winners and losers in fisheries under climate change based on shifts in biomass, species composition and potential catches. Understanding how climate change is likely to alter the fisheries revenues of maritime countries is a crucial next step towards the development of effective socio-economic policy and food sustainability strategies to mitigate and adapt to climate change. Particularly, fish prices and cross-oceans connections through distant water fishing operations may largely modify the projected climate change impacts on fisheries revenues. However, these factors have not formally been considered in global studies. Here, using climate-living marine resources simulation models, we show that global fisheries revenues could drop by 35% more than the projected decrease in catches by the 2050 s under high CO2 emission scenarios. Regionally, the projected increases in fish catch in high latitudes may not translate into increases in revenues because of the increasing dominance of low value fish, and the decrease in catches by these countries' vessels operating in more severely impacted distant waters. Also, we find that developing countries with high fisheries dependency are negatively impacted. Our results suggest the need to conduct full-fledged economic analyses of the potential economic effects of climate change on global marine fisheries.

  17. Projected change in global fisheries revenues under climate change

    Science.gov (United States)

    Lam, Vicky W. Y.; Cheung, William W. L.; Reygondeau, Gabriel; Sumaila, U. Rashid

    2016-09-01

    Previous studies highlight the winners and losers in fisheries under climate change based on shifts in biomass, species composition and potential catches. Understanding how climate change is likely to alter the fisheries revenues of maritime countries is a crucial next step towards the development of effective socio-economic policy and food sustainability strategies to mitigate and adapt to climate change. Particularly, fish prices and cross-oceans connections through distant water fishing operations may largely modify the projected climate change impacts on fisheries revenues. However, these factors have not formally been considered in global studies. Here, using climate-living marine resources simulation models, we show that global fisheries revenues could drop by 35% more than the projected decrease in catches by the 2050 s under high CO2 emission scenarios. Regionally, the projected increases in fish catch in high latitudes may not translate into increases in revenues because of the increasing dominance of low value fish, and the decrease in catches by these countries’ vessels operating in more severely impacted distant waters. Also, we find that developing countries with high fisheries dependency are negatively impacted. Our results suggest the need to conduct full-fledged economic analyses of the potential economic effects of climate change on global marine fisheries.

  18. Projected change in global fisheries revenues under climate change

    Science.gov (United States)

    Lam, Vicky W. Y.; Cheung, William W. L.; Reygondeau, Gabriel; Sumaila, U. Rashid

    2016-01-01

    Previous studies highlight the winners and losers in fisheries under climate change based on shifts in biomass, species composition and potential catches. Understanding how climate change is likely to alter the fisheries revenues of maritime countries is a crucial next step towards the development of effective socio-economic policy and food sustainability strategies to mitigate and adapt to climate change. Particularly, fish prices and cross-oceans connections through distant water fishing operations may largely modify the projected climate change impacts on fisheries revenues. However, these factors have not formally been considered in global studies. Here, using climate-living marine resources simulation models, we show that global fisheries revenues could drop by 35% more than the projected decrease in catches by the 2050 s under high CO2 emission scenarios. Regionally, the projected increases in fish catch in high latitudes may not translate into increases in revenues because of the increasing dominance of low value fish, and the decrease in catches by these countries’ vessels operating in more severely impacted distant waters. Also, we find that developing countries with high fisheries dependency are negatively impacted. Our results suggest the need to conduct full-fledged economic analyses of the potential economic effects of climate change on global marine fisheries. PMID:27600330

  19. Projected change in global fisheries revenues under climate change.

    Science.gov (United States)

    Lam, Vicky W Y; Cheung, William W L; Reygondeau, Gabriel; Sumaila, U Rashid

    2016-01-01

    Previous studies highlight the winners and losers in fisheries under climate change based on shifts in biomass, species composition and potential catches. Understanding how climate change is likely to alter the fisheries revenues of maritime countries is a crucial next step towards the development of effective socio-economic policy and food sustainability strategies to mitigate and adapt to climate change. Particularly, fish prices and cross-oceans connections through distant water fishing operations may largely modify the projected climate change impacts on fisheries revenues. However, these factors have not formally been considered in global studies. Here, using climate-living marine resources simulation models, we show that global fisheries revenues could drop by 35% more than the projected decrease in catches by the 2050 s under high CO2 emission scenarios. Regionally, the projected increases in fish catch in high latitudes may not translate into increases in revenues because of the increasing dominance of low value fish, and the decrease in catches by these countries' vessels operating in more severely impacted distant waters. Also, we find that developing countries with high fisheries dependency are negatively impacted. Our results suggest the need to conduct full-fledged economic analyses of the potential economic effects of climate change on global marine fisheries. PMID:27600330

  20. 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.

  1. 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.

  2. 76 FR 53832 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Decrease...

    Science.gov (United States)

    2011-08-30

    ... limit for GOM cod is 500 lb (226.8 kg) per day-at-sea (DAS), up to 2,000 lb (907.2 kg) per trip (76 FR... (76 FR 30035; May 24, 2011). As of August 11, 2011, based on the best available catch information... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA652 Fisheries of...

  3. 76 FR 57945 - Fisheries Off West Coast States; West Coast Salmon Fisheries; Notice of Availability for...

    Science.gov (United States)

    2011-09-19

    ... approve Amendment 16 to the FMP. On January 16, 2009 (74 FR 3178), NMFS adopted revisions to its... intended to prevent and end overfishing and rebuild fisheries through implementation of status determination criteria, overfishing limits, annual catch limits, and accountability measures. Amendment 16...

  4. 77 FR 15991 - Fisheries of the Northeastern United States; Proposed 2012 Spiny Dogfish Fishery Specifications

    Science.gov (United States)

    2012-03-19

    .... Christopher M. Moore, Executive Director, Mid Atlantic Fishery Management Council, Suite 201, 800 N. State St... Annual Catch Limit (ACL) and Accountability Measures Omnibus Amendment process (September 29, 2011; 76 FR.... Authority: 16 U.S.C. 1801 et seq. Dated: March 13, 2012. Alan D. Risenhoover, Action Deputy...

  5. Catch composition of the Dutch pelagic fleet in the Mauritanian Exclusive Economic Zone during the year 2003: results of the scientific observer program

    NARCIS (Netherlands)

    Hofstede, ter R.

    2004-01-01

    This report describes the total catches of the Dutch pelagic fleet in the Mauritanian Exclusive Economic Zone during the year 2003. Data have been obtained by the 'Scientific Observer Program', which monitors the catch (both landings and discards) of the Dutch fishery for small pelagics in Mauritani

  6. Subsidies and their Implications on Fisheries Management in St. Lucia

    Directory of Open Access Journals (Sweden)

    Kaitlan Lay

    2011-04-01

    Full Text Available Worldwide, fisheries subsidies contribute to fleet overcapacity, overfishing, and to the decimation of the marine environment.  Despite the fact that small-scale fisheries catch roughly the same amount of edible fish while causing less overall environmental damage, government preference for subsidy allotment continues to be in favor of industrial fisheries.  St. Lucia is a Caribbean island which is recognized as a small vulnerable economy that relies heavily on its small-scale fisheries for economic and social development.  The island nation has become largely dependent on foreign subsidies towards its fishery sector, with the majority of the subsidies designated to capacity enhancing programs, which lead to resource overexploitation.  This report discusses the importance of directing subsidies away from programs that negatively impact the fishery and moving them towards beneficial programs, with a focus on the development and implementation of effective fisheries management systems for St. Lucia.

  7. COMMERCIAL FRESHWATER FISHERIES IN REPUBLIC OF CROATIA IN 2009 AND 2010

    Directory of Open Access Journals (Sweden)

    Josip Suić

    2011-12-01

    Full Text Available Commercial freshwater fisheries in Republic of Croatia is regulated according to the Freshwater Fisheries Act (2001 and special sub-acts regarding commercial freshwater fisheries, as well as other sub-laws which deal with fish sizes, no-fishing periods and estimation of damages on fish stocks. Subjects of regulations are the areas for commercial fisheries, commercial fishermen exams, fishing permits, fishing tools and gear, yearly allowed catch quotas and catch data delivery. All the sub-acts are presented, as well the explanations of the key terminology and activities. The commercial fisheries catch data for 2009 were collected, analyzed and finally interacted to the yearly allowed catch quotas. According to the results of the analysis of particular interactions of catch/total catch, as well as the interaction between particular fish species and yearly allowed catch quotas, it is obvious that only the amount of carp catch on the Dunav in 2009 goes beyond the yearly allowed catch quota. According to the vast lack of inspectors, on local and state level as well, it is expected that after accepting of the new inspection regulations and competences, as well the lifting of the ban of recruiting state employees, it would be possible to ensure the more efficient surveillance and control of whole fisheries sector, also markets and restaurants. This will surely help decreasing of the black market. Also, according to the new Freshwater Fisheries Act, which is in the process of adoption, new regulations that relate to fish market will be accepted (landing places, first sell, first buyer.

  8. Hawaii DAR Fisherman Reporting System Data (Catch)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains the catch data from fishers who take marine life for commercial purposes and report their catch, effort, and sales on a commercial catch...

  9. How flowers catch raindrops

    CERN Document Server

    Amador, Guillermo; Hu, David

    2011-01-01

    Several species of plants have raindrop-sized flowers that catch raindrops opportunistically in order to spread their 0.3-mm seeds distances of over 1 m. In the following fluid dynamics video, we show examples of these plants and some of the high speed videography used to visualize the splash dynamics responsible for raindrop-driven seed dispersal. Experiments were conducted on shape mimics of the plants' fruit bodies, fabricated using a 3D printer. Particular attention was paid to optimizing flower geometries and drop impact parameters to propel seeds the farthest distance. We find off-center impacts are the most effective for dispersing seeds. Such impacts amplify the raindrop's speed, encapsulate seeds within drops, and direct the seed trajectory at angles optimal for long-distance dispersal.

  10. 75 FR 9157 - Proposed Information Collection; Comment Request; Alaska Region Scale and Catch Weighing...

    Science.gov (United States)

    2010-03-01

    ... requirements address performance standards designed to ensure that all catch delivered to the processor is... series of design criteria. Because of the wide variations in factory layout for inshore processors, NMFS... Community Development Quota Program (CDQ) catcher/processors, American Fisheries Act (AFA)...

  11. 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

  12. A spatially distinct history of the development of california groundfish fisheries.

    Science.gov (United States)

    Miller, Rebecca R; Field, John C; Santora, Jarrod A; Schroeder, Isaac D; Huff, David D; Key, Meisha; Pearson, Don E; MacCall, Alec D

    2014-01-01

    During the past century, commercial fisheries have expanded from small vessels fishing in shallow, coastal habitats to a broad suite of vessels and gears that fish virtually every marine habitat on the globe. Understanding how fisheries have developed in space and time is critical for interpreting and managing the response of ecosystems to the effects of fishing, however time series of spatially explicit data are typically rare. Recently, the 1933-1968 portion of the commercial catch dataset from the California Department of Fish and Wildlife was recovered and digitized, completing the full historical series for both commercial and recreational datasets from 1933-2010. These unique datasets include landing estimates at a coarse 10 by 10 minute "grid-block" spatial resolution and extends the entire length of coastal California up to 180 kilometers from shore. In this study, we focus on the catch history of groundfish which were mapped for each grid-block using the year at 50% cumulative catch and total historical catch per habitat area. We then constructed generalized linear models to quantify the relationship between spatiotemporal trends in groundfish catches, distance from ports, depth, percentage of days with wind speed over 15 knots, SST and ocean productivity. Our results indicate that over the history of these fisheries, catches have taken place in increasingly deeper habitat, at a greater distance from ports, and in increasingly inclement weather conditions. Understanding spatial development of groundfish fisheries and catches in California are critical for improving population models and for evaluating whether implicit stock assessment model assumptions of relative homogeneity of fisheries removals over time and space are reasonable. This newly reconstructed catch dataset and analysis provides a comprehensive appreciation for the development of groundfish fisheries with respect to commonly assumed trends of global fisheries patterns that are typically

  13. LPS Catch and Effort Estimation

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Data collected from the LPS dockside (LPIS) and the LPS telephone (LPTS) surveys are combined to produce estimates of total recreational catch, landings, and...

  14. BIOGAS PRODUCTION FROM CATCH CROPS

    DEFF Research Database (Denmark)

    Molinuevo-Salces, Beatriz; Larsen, Søren U.; Ahring, Birgitte Kiær;

    2014-01-01

    Catch crop cultivation combined with its use for biogas production would increase renewable energy production in the form of methane, without interfering with the production of food and fodder crops. The low biomass yield of catch crops is the main limiting factor for using these crops as co......-substrate in manure-based biogas plants and the profit obtained from the sale of biogas barely compensates for the harvest costs. A new agricultural strategy to harvest catch crops together with the residual straw of the main crop was investigated to increase the biomass and thereby the methane yield per hectare...... biomass. Leaving the straw on the field until harvest of the catch crop in the autumn could benefit biogas production due to the organic matter degradation of the straw taking place on the field during the autumn months. This new agricultural strategy may be a good alternative to achieve economically...

  15. Multi-national industry capacity in the North Sea fishery

    DEFF Research Database (Denmark)

    Lindebo, Erik

    2005-01-01

    Fisheries managers often see the management of regional fisheries as a more pertinent approach than managing separate national fleet units that exploit numerous fish stocks. This article considers an industry approach, using data envelopement analysis (DEA), to shed light on the exploitation of t...... insight is also given to surplus and optimal vessels in terms of catches and vessel characteristics. Simulations of the impact of possible quota reductions and restrictions of equal capacity reduction across nations are also considered....

  16. The future prospects for the Lake Victoria fishery

    OpenAIRE

    Kudhongania, A.W.

    1990-01-01

    The annual fish yields from Lake Victoria have been increasing when the species diversity was dramatically declining. The new fishery is dominated by the introduced predator (Lates niloticus Linne), the exotic herbivore (Oreochromis niloticus Linne) and an indigenous zooplanktivore (Rastrineobola argentea Pellegrin). While the three predominant fish species could sustain the high catch levels, the future viability for the fishery will depend on prudent exploitation regimes and effective manag...

  17. Managing Uncertainty for an Integrated Fishery

    Directory of Open Access Journals (Sweden)

    MB Hasan

    2012-06-01

    Full Text Available This paper investigates ways to deal with the uncertainties in fishing trawler scheduling and production planning in a quota-based integrated commercial fishery. A commercial fishery faces uncertainty mainly from variation in catch rate, which may be due to weather, and other environmental factors. The firm tries to manage this uncertainty through planning co-ordination of fishing trawler scheduling, catch quota, processing and labour allocation, and inventory control. Scheduling must necessarily be done over some finite planning horizon, and the trawler schedule itself introduces man-made variability, which in turn induces inventory in the processing plant. This induced inventory must be managed, complicated by the inability to plan easily beyond the current planning horizon. We develop a surprisingly simple innovation in inventory, which we have not seen in other papers on production management, which of requiring beginning inventory to equal ending inventory. This tool gives management a way to calculate a profit-maximizing safety stock that counter-acts the man-made variability due to the trawler scheduling. We found that the variability of catch rate had virtually no effects on the profitability with inventory. We report numerical results for several planning horizon models, based on data for a major New Zealand fishery.

  18. Deepening Thermocline Displaces Salmon Catch On The Oregon Coast

    Science.gov (United States)

    Harrison, C. S.; Lawson, P.

    2015-12-01

    Establishing a linkage between fish stock distributions and physical oceanography at a fine scale provides insights into the dynamic nature of near-shore ocean habitats. Characterization of habitat preferences adds to our understanding of the ecosystem, and may improve forecasts of distribution for harvest management. The Project CROOS (Collaborative Research on Oregon Ocean Salmon) Chinook salmon catch data set represents an unprecedented high-resolution record of catch location and depth, with associated in-situ temperature measurements and stock identification derived from genetic data. Here we connect this data set with physical ocean observations to gain understanding of how circulation affects salmon catch distributions. The CROOS observations were combined with remote and in situ observations of temperature, as well as a data assimilative regional ocean model that incorporates satellite and HF radar data. Across the CROOS data set, catch is primarily located within the upwelling front over the seamounts and reef structures associated with Heceta and Stonewall Banks along the shelf break. In late September of 2014 the anomalously warm "blob" began to arrive on the Oregon coast coincident with a strong downwelling event. At this time the thermocline deepened from 20 to 40 m, associated with a deepening of salmon catch depth. A cold "bulb" of water over Heceta Bank may have provided a thermal refuge for salmon during the initial onshore movement of the anomalously warm water. These observations suggest that a warming ocean, and regional warming events in particular, will have large effects on fish distributions at local and regional scales, in turn impacting fisheries.

  19. Factors affecting purse seine catches: an observer-based analysis

    Directory of Open Access Journals (Sweden)

    E.V. TSITSIKA

    2012-12-01

    Full Text Available A total of 72 fi shing trips were carried out by fi shery scientists onboard a purse seiner in the Pagasitikos Gulf (Greece in an attempt to identify factors affecting total and individual species’ catches. As trawling is completely banned in the study area, purse seining is the main fi shing method. It was found that month, water depth and fi shing area affected total and Trachurus spp. catches of the purse seine fi shery, with month and water depth alone explaining 77.8% and 6.4% respectively of the total variation of the data. Signifi cant interactions observed indicate that the fl uctuations in total catches differed by month and fi shing area as well as fi shing area and water depth. Fishing area and water depth interaction were found to affect Trachurus spp. catches signifi cantly. Results also suggested that generalized linear modelling of the purse seine catches can be used to obtain representative abundance indices by reducing the observed variability. Fishery scientists’ onboard observations alongside fi sh market recordings during the same period confi rmed that each fi sher has developed an individual decision-making fi shing process. Fisher’s trip choice behaviour was found to be modulated by several factors, such as distance of fi shing grounds from the port, market demands (both in terms of species and market prices, weather conditions, alternative fi shing strategies, previously gathered information, economic pressure and personal skills. These fi ndings are discussed in the light of the need to incorporate additional quantitative information to stock abundance estimates if improved fi sheries management scenarios are to be advanced.

  20. FISHERY MANAGEMENT IN THE DANUBE CATCHMENT AREA

    Directory of Open Access Journals (Sweden)

    Tomislav Treer

    1999-12-01

    Full Text Available There are three successive regions of the Danube, each of which has to deal with its own problems in fisheries. Sport fishing and ecological recontruction problem matters predominate in the upper flow. These problems also characterize the middle flow, where to a certain extent, commercial fishery is coming into view, while the lower flow has to deal with commercial fishery problems to full extent. The difference is not so much due to the morphometry as to the development and state of the economy of the countries in the river basin, their legislation on fishery and the manner in which the legislation is applied. Numerous dams of the upper flow of the Danube (29 in Germany, 9 in Austria, influence significantly the ichthyocenoses. An extreme example of that is Gabčikovo dam at the Slovak-Hungarian border where fish catch decreased to one fourth. In the lower segment of the Danube fish catch falls down to one third and is followed, by a drastically negative change of fish species composition. The records show that highly valued species as sturgeons, pike and tench are in drastic decline over the last few years. The changes were caused by physical barriers, like dams and weirs, by water pollution, by increasing concentration of nutrients and heavy metals, by poaching and by overexploitation. For all those alarming reasons, some legal interventions in commercial fishery must be undertaken. In the middle flow, where the Danube flows through Croatian territory, there have also been declining trends of bentivore and phytophyl species respectively. The law supports the coexistence of sport and commercial fishery in this area and although sport fishing should be given the advantage, commercial fishing should be rigorously supervised and allowed only when there is a naturally produced surplus. Because of fish migrations and political frontiers of Danube area, it is essential that the neighboring countries coordinate their efforts in managing fisheries

  1. Of Fish and Fishermen: Shifting Societal Baselines to Reduce Environmental Harm in Fisheries

    OpenAIRE

    Mimi E. Lam

    2012-01-01

    If reasonable fishery harvests and environmental harms are specified in new regulations, policies, and laws governing the exploitation of fish for food and livelihoods, then societal baselines can shift to achieve sustainable fisheries and marine conservation. Fisheries regulations can limit the environmental and social costs or harms caused by fishing by requiring the fishing industry to pay for the privilege to fish, via access fees for the opportunity to catch fish and extraction fees for ...

  2. Project Catch: A space based solution to combat illegal, unreported and unregulated fishing. Part I: Vessel monitoring system

    Science.gov (United States)

    Detsis, Emmanouil; Brodsky, Yuval; Knudtson, Peter; Cuba, Manuel; Fuqua, Heidi; Szalai, Bianca

    2012-11-01

    Space assets have a unique opportunity to play a more active role in global resource management. There is a clear need to develop resource management tools in a global framework. Illegal, Unregulated and Unreported (IUU) fishing is placing pressure on the health and size of fishing stocks around the world. Earth observation systems can provide fishery management organizations with cost effective monitoring of large swaths of ocean. Project Catch is a fisheries management project based upon the complimentary, but independent Catch-VMS and Catch-GIS systems. Catch-VMS is a Vessel Monitoring System with increased fidelity over existing offerings. Catch-GIS is a Geographical Information System that combines VMS information with existing Earth Observation data and other data sources to identify Illegal, Unregulated and Unreported (IUU) fishing. Project Catch was undertaken by 19 Masters students from the 2010 class of the International Space University. In this paper, the space-based system architecture of Project Catch is presented and analyzed. The rationale for the creation of the system, as well as the engineering trade-off studies in its creation, are discussed. The Catch-VMS proposal was envisaged in order to address two specific problems: (1) the expansion of illegal fishing to high-latitude regions where existing satellite systems coverage is an issue and (2) the lack of coverage in remote oceanic regions due to reliance on coastal-based monitoring. Catch-VMS utilizes ship-borne transponders and hosted-payload receivers on a Global Navigation Satellite System in order to monitor the position and activity of compliant fishing vessels. Coverage is global and continuous with multiple satellites in view providing positional verification through multilateration techniques. The second part of the paper briefly describes the Catch-GIS system and investigates its cost of implementation.

  3. 76 FR 4092 - Fisheries of the South Atlantic and Gulf of Mexico; South Atlantic Fishery Management Council...

    Science.gov (United States)

    2011-01-24

    ... catch share amendments, discuss the development of annual advisory panel reports, and discuss methodologies for predicting future catch levels for use in amendment analyses. The meeting will be held in.... Requests for sign language interpretation or other auxiliary aids should be directed to the Council...

  4. 75 FR 43149 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2010-07-23

    ... items of discussion in the committee's agenda are as follows: The Committee will continue development of... Accommodations This meeting is physically accessible to people with disabilities. Requests for sign language... flounder it is predicted it will catch, and defining the General Category IFQ fishery as a separate...

  5. 75 FR 8674 - Western Pacific Fishery Management Council; Public Meetings

    Science.gov (United States)

    2010-02-25

    ... Archipelago 1. Tsunami Impacts on Nearshore Ecosystems D. Hawaii Archipelago 1. Options for Refining Essential... in the Marianas and highlights of the Hawaii and American Samoa courses and videos. Students will be.... Pelagic Fisheries A. Hawaii Longline Bigeye Tuna Management Under a Catch Limit B. Options to...

  6. 75 FR 7234 - South Atlantic Fishery Management Council; Public Meetings

    Science.gov (United States)

    2010-02-18

    ... recommendations from the Gulf of Mexico Fishery Management Council regarding Amendment 18 (being developed jointly with the Gulf Council) outlining Annual Catch Limits (ACLs) and Accountability Measures for king... Eat Lionfish Campaign, review draft policy on invasive species, and receive an ecosystem update....

  7. 75 FR 61639 - Fisheries of the Exclusive Economic Zone Off Alaska; Skate Management in the Groundfish Fisheries...

    Science.gov (United States)

    2010-10-06

    ... considered decision. The action should be disapproved in favor of the status quo. Response: This action must... Economic Zone Off Alaska; Skate Management in the Groundfish Fisheries of the Bering Sea and Aleutian Islands; Groundfish Annual Catch Limits for the Bering Sea and Aleutian Islands Management Area and...

  8. 77 FR 10463 - Fisheries of the Northeastern United States; Proposed 2012-2013 Northeast Skate Complex Fishery...

    Science.gov (United States)

    2012-02-22

    ...), reflecting the higher coefficients of variation (i.e., variability in catch between individual survey tows... the skate fisheries. Amendment 3 to the Skate FMP was implemented in July 2010 (75 FR 34049, June 16... (76 FR 28328, May 17, 2011). In June 2011, the SSC gave the Council a new recommendation for skate...

  9. Discriminación de variables ambientales que influencian la captura por unidad de esfuerzo: el caso de la pesquería de krill antártico Discrimination of environmental variables that influence the catch per unit effort: the case of the Antarctic krill fishery

    Directory of Open Access Journals (Sweden)

    Juan Carlos Quiroz

    2011-01-01

    Full Text Available Para emplear la captura por unidad de esfuerzo (CPUE como índice de abundancia se debe realizar normalmente un proceso de estandarización que consiste en aislar desde las series de tiempo de CPUE todos aquellos efectos exógenos a las variaciones temporales de la abundancia. Dentro del conjunto de efectos exógenos, como aquellos generados por modificaciones en la eficiencia de las embarcaciones pesqueras, variaciones en las estrategias de pesca y variaciones ambientales, la elección de estos últimos ha sido considerada una de las etapas más difícil, arbitraria y menos documentada, debido a que los efectos ambientales varían en diferentes escalas temporales de forma autocorrelacionada y no aleatoria, influenciando a la CPUE por medio de un proceso causa-efecto. Los modelos de función de transferencia (MFT fueron construidos para describir estadísticamente la relación causa-efecto entre dos series de tiempo y se proponen en este artículo como una herramienta valida para i discriminar efectos ambientales que influencian la CPUE y ii describir la forma en que estos efectos deben ser incluidos en un modelo lineal generalizado (MLG. Se analizó la CPUE de krill antartico para el período agosto 1989-julio 1999, y como posibles efectos causales el índice de Oscilación Antartico (IOA y las Presiones Atmosféricas al Nivel del Mar (PANM. El MFT muestra que las PANM bajo un desfase anual (PANM12, influencian la CPUE de krill antartico; mientras que la IAO no tiene un efecto significativo. La utilización de la PANM12 en un MLG incrementó en 31% la explicación de la devianza respecto a la serie sin desfase. Se concluye que los MFT son herramientas promisorias para incluir efectos ambientales en la estandarización de la CPUE resultando en índices de abundancia menos sesgados y más precisos.The use of the catch per unit effort (CPUE as an index of abundance usually requires a standardization process consisting of isolating all those

  10. Fishprint of Coastal Fisheries in Jalisco, Mexico

    Directory of Open Access Journals (Sweden)

    Myrna Leticia Bravo-Olivas

    2014-12-01

    Full Text Available Coastal fisheries contribute to global food security, since fish are an important source of protein for many coastal communities in the world. However, they are constrained by problems, such as weak management of fisheries and overfishing. Local communities perceive that they are fishing less, as in other fisheries in the world. The aim of this study was to evaluate the fisheries sustainability in the Jalisco coast through the fishing footprint, or fishprint (FP, based on the primary productivity required (PPR and the appropriated surface by the activity (biocapacity. The total catch was 20,448.2 metric tons from 2002–2012, and the average footprint was calculated to be 65,458 gha/year, a figure that quadrupled in a period of 10 years; the biocapacity decreased, and the average trophic level of catches was 3.1, which implies that it has remained at average levels, resulting in a positive balance between biocapacity and ecological footprint. Therefore, under this approach, the fishing activity is sustainable along the coast of Jalisco.

  11. Factors of Ukrainian fisheries deterioration in terms of industrial enterprises mechanism of management formation

    Directory of Open Access Journals (Sweden)

    Natalia Yarkina

    2013-05-01

    Full Text Available Analysis of factors predetermining the crisis situation of Ukrainian fisheries from the point of view of the appropriate areas of fishing activities, namely: aquaculture, fishery in the Black Sea and the Sea of Azov basin, ocean fishery is described in this article. Along with the transition period, common economical reasons which stipulated crisis tendencies of national fisheries development, certain industrial sectors were characterized by specifically industrial factors of fish catching volume reduction. Particularly, reasons of fish farming commodity production decreasing were such as: business environment changes; inadequate privatization; deterioration of fish farming technology; deterioration of Ukrainian market situation for national fish producer. In addition, fishery resources depletion reaching critical point also affected negatively the fish catching volume from inland water bodies. Reasons of catastrophic situation in national oceanic fishing are following: modifications of juridical and international legal terms in fishery; fishery monitoring by international fishery regional agencies; steady growth of world oil and oil products prices; quantitative and qualitative deterioration of ocean fleet bases. It is stated that resolution of the problems related to both the stagnation of national fishery and putting industrial enterprises out of crisis is basically outside the specific business entity competence and requires an immediate governmental interference. The set of measures of governmental support for revival and development of Ukrainian fisheries as a strategically important branch of national economy which was worked out with regard to identified factors of Ukrainian fisheries deterioration is to become one of key elements of fish industry enterprises mechanism of management

  12. Challenges of Freshwater Fisheries in Nepal: A Short Overview

    Directory of Open Access Journals (Sweden)

    Nawaraj Gautam

    2015-12-01

    Full Text Available Abundant freshwater resources originated from Himalayas and high geographical variations in Nepal are two factors which might be positive benefits to improve the aquaculture in land locked country. Low labor cost is also another plus point to get better management in fisheries sector. Freshwater fisheries in Nepal are mostly dominated by catch up fisheries of indigenous fish species available in rivers, lakes and paddy fields but exotic and sophisticated species been also introduced in small scales. Beside these, poly cultural pond fish farming is most viable. Carp fishes are the major species and uncontrolled unmanaged capture fisheries dominants over systematic aquaculture. Poor technological implementations, poor budgetary plan, not proper management strategies, lack of quality fish feed and fingerlins, lower market availability are some of the major challenges of Nepalese freshwater fisheries. Long-term sustainable plan, scientific and technological study on indigenous fish species, proper hygiene management and better disease control might improve the current aquaculture status of Nepal.

  13. CROATIAN FRESHWATER FISHERIES IN 1996.

    Directory of Open Access Journals (Sweden)

    Mirko Turk

    1997-07-01

    Full Text Available Data on the production and fish catch according to species, on the surface of the fish ponds, on the means of fish catching and on the distribution of the production and the catch in 1996 is presented. The surface area used for production of fish has decreased by 1357 ha or 11.99%. The total fish amount has decreased by 1,921.00 tons or 29.76%. The feeding coefficient is 4 kg (33.33% bigger compared to the previous year. The amount of the fertilizer used has decreased by 18.79%. The fry carp growing ponds make up 5.99% of the total fish pond surfaces, the young carp ponds 21.13%, and the ponds with consumption fish 71.53%. The total fish amount in the carp ponds was 376 kg/ha, and in the trout ponds it was 146.6 tons/ha. The most produced fish species is the carp with 82.21 %, followed by the trout with 8.57%, the herbivorous fish with 4.78%, while all the other fish species make up 4.44% of the entire production. In the structure of herbivorous fish the grass carp is leading with 64,28%, followed by the big head carp with 26.02% and the silver carp with 9.70%. Compared to the previous year the production of the trout and tench has somewhat increased, while the production of all the other species of fish has decreased. Fish catch in open waters has increased by 19.23% in comparison to the previous year. In the production and catch of the total freshwater fish, carp made up 77.46%, the herbivorous fish made up 4.32%, trout 4.32%, sheat fish, pike perch and pike 2.99% and all other fish species 7.36%. As far as the distribution of production and catch is concerned, 46.91% were sold on the market, 39.19% were used for reproduction (stocking the fish farms, mortalities were 6.23%, and for personal use (sports fishing 7.67% was used. The number of fisheries workers has decreased by 17.75%, and the production per worker has also decreased by 26.62%, compared to the previous year. Average production per worker was 5.87 tons of fish.

  14. CROATIAN FRESHWATER FISHERIES IN 1997

    Directory of Open Access Journals (Sweden)

    Mirko Turk

    1998-10-01

    Full Text Available Data on the production and fish catch according to species, on the surface of the fish ponds, on the means of fish catching and on the distribution of the production and the catch in 1997 is presented. The surface area used for production of fish has decreased for 836 ha or 8.40%. The total fish amount was bigger for 477 tons, or 10,52%. The feeding coefficient is 2.6 kg decreased 35% for in comparison to the bigger compared to the previous year. The amount of the fertilizer used is bigger for 37.30%. The fry carp growing ponds make up 6.50% of the total fish pond surfaces, the young carp ponds 22.04/0, and the ponds with consumption fish 70.31%. The total amount in the carp ponds was 446 kg/ha, and in the trout ponds it was 160.8 tons/ha. The most produced fish species is the carp with 79.32%, followed by the trout with 11.50%, the herbivorous fish with 4.25%, while all the other fish species make up 4.93% of the entire production. In the structure of herbivorous fish the grass carp is leading with 69,23%, followed by the big head carp with 29.74% and the silver carp with 1.03%. Compared to the previous year the production of the carp, grass carp and tench is increased. Fish catch in open waters has decreased by 5.53% in comparison to the previous year. In the production and catch of the total freshwater fish, carp made up 75.34%, herbivorous fish made up 3.89%, trout 10.66%, sheat fish, pike perch and pike 2.70% and all other fish species 7.41%. As far as the distribution of production and catch of fish is concerned, 52,80% were sold on the market, 37.94% were used for reproduction (stocking the fish farms, mortality was 1.43%, and for personal use (sports fishing 7.83%. The number of fisheries workers has decreased for 8.17%, and the production per worker is bigger for 22.25%, compared to the previous year. Average production per worker was 7.17% tons of fish.

  15. Passing and Catching in Rugby.

    Science.gov (United States)

    Namudu, Mike M.

    This booklet contains the fundamentals for rugby at the primary school level. It deals primarily with passing and catching the ball. It contains instructions on (1) holding the ball for passing, (2) passing the ball to the left--standing, (3) passing the ball to the left--running, (4) making a switch pass, (5) the scrum half's normal pass, (6) the…

  16. MSY from catch and resilience

    DEFF Research Database (Denmark)

    Jørgensen, Ole A; Chrysafi, Anna

    A simple Schaefer model was tested on the Greenland halibut stock offshore in NAFO SA 0 and 1. The minimum data required for this model is a catch time series and a measure of the resilience of the species. Other input parameters that had to be guessed were the carrying capacity, the biomass...

  17. Catching up on conventions grammar lessons for middle school writers

    CERN Document Server

    Francois, Chantal

    2009-01-01

    Are Chantal Francois and Elisa Zonana's students like yours? Economically, linguistically, and culturally diverse; excited to write; yet underprepared for the kinds of writing demanded in middle school and beyond? For success in school, Standard English grammar isn't optional-it's an option every student must have. Don't be daunted. Francois and Zonana found a solution, and in Catching Up on Conventions they share lessons that help kids quickly master Standard English grammar.

  18. Relationships among fisheries exploitation, environmental conditions, and ecological indicators across a series of marine ecosystems

    Science.gov (United States)

    Fu, Caihong; Large, Scott; Knight, Ben; Richardson, Anthony J.; Bundy, Alida; Reygondeau, Gabriel; Boldt, Jennifer; van der Meeren, Gro I.; Torres, Maria A.; Sobrino, Ignacio; Auber, Arnaud; Travers-Trolet, Morgane; Piroddi, Chiara; Diallo, Ibrahima; Jouffre, Didier; Mendes, Hugo; Borges, Maria Fatima; Lynam, Christopher P.; Coll, Marta; Shannon, Lynne J.; Shin, Yunne-Jai

    2015-08-01

    Understanding how external pressures impact ecosystem structure and functioning is essential for ecosystem-based approaches to fisheries management. We quantified the relative effects of fisheries exploitation and environmental conditions on ecological indicators derived from two different data sources, fisheries catch data (catch-based) and fisheries independent survey data (survey-based) for 12 marine ecosystems using a partial least squares path modeling approach (PLS-PM). We linked these ecological indicators to the total biomass of the ecosystem. Although the effects of exploitation and environmental conditions differed across the ecosystems, some general results can be drawn from the comparative approach. Interestingly, the PLS-PM analyses showed that survey-based indicators were less tightly associated with each other than the catch-based ones. The analyses also showed that the effects of environmental conditions on the ecological indicators were predominantly significant, and tended to be negative, suggesting that in the recent period, indicators accounted for changes in environmental conditions and the changes were more likely to be adverse. Total biomass was associated with fisheries exploitation and environmental conditions; however its association with the ecological indicators was weak across the ecosystems. Knowledge of the relative influence of exploitation and environmental pressures on the dynamics within exploited ecosystems will help us to move towards ecosystem-based approaches to fisheries management. PLS-PM proved to be a useful approach to quantify the relative effects of fisheries exploitation and environmental conditions and suggest it could be used more widely in fisheries oceanography.

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

    DEFF Research Database (Denmark)

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

    2015-01-01

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

  20. Discarding in the shrimp fisheries in Skagerrak and the Norwegian Deep (ICES Divs. IIIa and IVa east)

    DEFF Research Database (Denmark)

    Munch-Petersen, Sten; Ulmestrand, Mats; Søvik, Guldborg;

    by TACs and subsequent national quotas. Estimates of the total amount of discards in the shrimp fisheries in IIIa and IVa east are based both on onboard sampling of catches (Denmark and Sweden) and indirect estimates (Norway). In fisheries management in the North Atlantic discarding has become...

  1. 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

  2. Physiological response of some economically important freshwater salmonids to catch-and-release fishing

    Science.gov (United States)

    Wedemeyer, G.A.; Wydoski, R.S.

    2008-01-01

    Catch-and-release fishing regulations are widely used by fishery resource managers to maintain both the quantity and quality of sport fish populations. We evaluated blood chemistry disturbances in wild brook trout Salvelinus fontinalis, brown trout Salmo trutta, cutthroat trout Oncorhynchus clarkii, and Arctic grayling Thymallus arcticus that had been hooked and played for 1-5 min in waters of the intermountain western United States. A hatchery stock of brown trout was included for comparison. To assess time needed for recovery, additional test groups were played for 5 min and then released into net-pens, where they were held for up to 72 h. The osmoregulatory and metabolic disturbances associated with catch-and-release fishing under the conditions we tested were minimal and judged to be well within normal physiological tolerance limits. In fish that were held for recovery, the blood chemistry alterations that did occur appeared to be related to stress from confinement in the net-pens. Our results confirm the results of previous studies, showing that prerelease air exposure and handling cause more physiological stress than does either hooking per se or playing time. Fishery managers must be aware of the differences in the perceptions, attitudes, and values of different societal groups, some of which feel that catch-and-release fishing should be banned because it is cruel to the animals. On the basis of brain anatomy, it seems highly unlikely that fish experience pain in the same manner as humans experience it, because fish lack a neocortex, the brain structure that enables the sensation of pain in higher vertebrates. However, independent of the neurobiological argument, our results indicate that under conditions similar to those tested, fish subjected to catch and release are neither suffering nor particularly stressed. Improved education programs about the relatively benign physiological effects of catch-and-release fishing as a fishery management practice would

  3. Portuguese commercial fisheries of swordfish, Xiphias gladius

    Directory of Open Access Journals (Sweden)

    André Roxo Nunes

    2014-05-01

    Full Text Available Swordfish has an important role in Portuguese fisheries. Portuguese commercial swordfish landings were analyzed from 1986 to 2012. Commercial landings of five incidental catches of pelagic sharks (Alopias superciliosus, Alopias vulpinus, Isurus oxyrinchus, Prionace glauca and Sphryna zygaena were also evaluated for the same period. A total of 3.653 landings of swordfish (12.625 t were observed in 62 ports. Annual landings for the fishery generally decreased over time, with a corresponding increase in price per kilogram. The most fished shark was blue shark with 12.715 t in 48 ports. It was followed by shortfin mako, thresher, smooth hammerhead and bigeye thresher (with 5.113 t, 672 t, 19 t and 0,45 t, respectively. The lowest landings of swordfish were observed in the first semester of each years while catch levels of blue sharks were high. Shortfin mako catches raised only since 2005. The remaining species studies always displayed lower landings, suggesting that most of them are bycaught.

  4. Biogas production from catch crops

    DEFF Research Database (Denmark)

    Molinuevo-Salces, Beatriz; Larsen, Søren U.; Ahring, Birgitte Kiær;

    2013-01-01

    Manure-based biogas plants in Denmark are dependent on high yielding biomass feedstock in order to secure economically feasible operation. The aim of this study was to investigate the potential of ten different catch crop species or mixtures as feedstock for biogas production in co......, being in the ranges of 1.4–3.0 t ha−1 and 0.3–1.7 t ha−1 for Holstebro and Aabenraa, respectively. Specific methane yields were in the range of 229–450 m3 t−1 of VS. Methane yields per hectare of up to 800 m3 ha−1 were obtained, making catch crops a promising source of feedstock for manure-based biogas...

  5. 50 CFR 85.40 - Cost sharing.

    Science.gov (United States)

    2010-10-01

    ... Use/Acceptance of Funds § 85.40 Cost sharing. (a) The Federal share shall not exceed 75% of total costs approved in the grant agreement. (b) The provisions of 43 CFR 12.64 apply to cost sharing or... 50 Wildlife and Fisheries 6 2010-10-01 2010-10-01 false Cost sharing. 85.40 Section 85.40...

  6. Indigenous community-based fisheries in Australia.

    Science.gov (United States)

    Carter, Jennifer; Hill, Greg

    2007-12-01

    The commercial sea cucumber species known as Sandfish (Holothuria scabra) occurs intertidally and subtidally in the Northern Territory of Australia, on or adjacent to Aboriginal land. A 4-yr program of community-based fisheries research with Aboriginal Australians was implemented to assess the viability of indigenous Australians' involvement in the wild-stock fishery. The research involved extensive and intensive indigenous participation, unusual in Australian biophysical sciences research, during field survey and habitat mapping, complemented by commercial catch data modelling and discussion of its implications. Field surveys produced Sandfish distribution and site-specific density, and revealed some areas that were not commercially fished. Catch data modelling results suggested that no additional effort could be sustained, however commercial fishers increased their effort, expanding their operations into the newly mapped areas. These actions effectively precluded indigenous peoples' aspirations of entry into the commercial fishery. The efficacy and outcomes of participatory program design with indigenous Australians need critique in the absence of the political will and statutory backing to provide equitable access to resources. PMID:17175093

  7. 76 FR 23962 - Fisheries Off West Coast States; Highly Migratory Species Fisheries; Annual Catch Limits and...

    Science.gov (United States)

    2011-04-29

    ... currently MUS, plus pelagic sting ray (Dasyetis violacea), wahoo (Acathocybium solandri), common mola (Mola... Guidelines (50 CFR 600.310) (see: 74 FR 3178, January 16, 2009). The Guidelines are intended to help...

  8. 76 FR 56327 - Fisheries Off West Coast States; Highly Migratory Species Fisheries; Annual Catch Limits and...

    Science.gov (United States)

    2011-09-13

    ... yield and optimal yield, and specify status determination criteria so that overfishing and overfished... that ``Conservation and management measures shall prevent overfishing while achieving, on a continuing...) and specifies status determination criteria (SDC) so that overfishing and overfished...

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

    Directory of Open Access Journals (Sweden)

    Eric Gilman

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

  10. Fisheries and reproductive biology of Octopus vulgaris (Mollusca: Cephalopoda) in the Gulf of Alicante (Northwestern Mediterranean)

    OpenAIRE

    Gonzalez, M; E. BARCALA; J.L. PEREZ-GIL; M.N. CARRASCO; M. C. Garcia-Martinez

    2012-01-01

    The common octopus Octopus vulgarisCuvier, 1797 is the most fished cephalopod species along the Spanish coasts. Its catches are highly fluctuating due to the short life cycle of the species and to the annual variability of the recruitment pattern, strongly dependent on the environmental conditions affecting the eggs and paralarvae. This study examines the common octopus fishery, the catch composition, and the main features of the reproductive biology of this species in the Gulf of Alicante (S...

  11. Detecting Lagrangian fronts with favourable fishery conditions

    CERN Document Server

    Prants, S V; Uleysky, M Yu

    2012-01-01

    Lagrangian fronts in the ocean delineate boundaries between surface waters with different Lagrangian properties. They can be accurately detected in a given velocity field by computing synoptic maps of the drift of synthetic tracers, their Lyapunov exponents, and other Lagrangian indicators. Using Russian ship's catch and location data for a number of commercial fishing seasons in the region of the northwest Pacific with one of the richest fishery in the world, it is shown that the saury fishing grounds with maximal catches are located mainly along those Lagrangian fronts where productive cold waters of the Oyashio Current, warmer waters of the southern branch of the Soya Current, and waters of warm-core Kuroshio rings converge. Computation of those fronts with the altimetric geostrophic velocity fields both in the years with the First and Second Oyashio Intrusions shows that in spite of different oceanographic conditions in both the cases the front locations may serve good indicators of potential fishing grou...

  12. Creel survey sampling designs for estimating effort in short-duration Chinook salmon fisheries

    Science.gov (United States)

    McCormick, Joshua L.; Quist, Michael C.; Schill, Daniel J.

    2013-01-01

    Chinook Salmon Oncorhynchus tshawytscha sport fisheries in the Columbia River basin are commonly monitored using roving creel survey designs and require precise, unbiased catch estimates. The objective of this study was to examine the relative bias and precision of total catch estimates using various sampling designs to estimate angling effort under the assumption that mean catch rate was known. We obtained information on angling populations based on direct visual observations of portions of Chinook Salmon fisheries in three Idaho river systems over a 23-d period. Based on the angling population, Monte Carlo simulations were used to evaluate the properties of effort and catch estimates for each sampling design. All sampling designs evaluated were relatively unbiased. Systematic random sampling (SYS) resulted in the most precise estimates. The SYS and simple random sampling designs had mean square error (MSE) estimates that were generally half of those observed with cluster sampling designs. The SYS design was more efficient (i.e., higher accuracy per unit cost) than a two-cluster design. Increasing the number of clusters available for sampling within a day decreased the MSE of estimates of daily angling effort, but the MSE of total catch estimates was variable depending on the fishery. The results of our simulations provide guidelines on the relative influence of sample sizes and sampling designs on parameters of interest in short-duration Chinook Salmon fisheries.

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

    Directory of Open Access Journals (Sweden)

    P. Satheeshkumar

    2013-05-01

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

  14. 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.

  15. Southeast Region Headboat Survey-Catch Records

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Southeast Region Headboat Survey (SRHS), administered by National Marine Fisheries Service (NMFS) Southeast Fisheries Science Center (SEFSC) personnel based at...

  16. Large-scale expansion of no-take closures within the Great Barrier Reef has not enhanced fishery production.

    Science.gov (United States)

    Fletcher, W J; Kearney, R E; Wise, B S; Nash, W J

    2015-07-01

    A rare opportunity to test hypotheses about potential fishery benefits of large-scale closures was initiated in July 2004 when an additional 28.4% of the 348 000 km2 Great Barrier Reef (GBR) region of Queensland, Australia was closed to all fishing. Advice to the Australian and Queensland governments that supported this initiative predicted these additional closures would generate minimal (10%) initial reductions in both catch and landed value within the GBR area, with recovery of catches becoming apparent after three years. To test these predictions, commercial fisheries data from the GBR area and from the two adjacent (non-GBR) areas of Queensland were compared for the periods immediately before and after the closures were implemented. The observed means for total annual catch and value within the GBR declined from preclosure (2000-2003) levels of 12780 Mg and Australian $160 million, to initial post-closure (2005-2008) levels of 8143 Mg and $102 million; decreases of 35% and 36% respectively. Because the reference areas in the non-GBR had minimal changes in catch and value, the beyond-BACI (before, after, control, impact) analyses estimated initial net reductions within the GBR of 35% for both total catch and value. There was no evidence of recovery in total catch levels or any comparative improvement in catch rates within the GBR nine years after implementation. These results are not consistent with the advice to governments that the closures would have minimal initial impacts and rapidly generate benefits to fisheries in the GBR through increased juvenile recruitment and adult spillovers. Instead, the absence of evidence of recovery in catches to date currently supports an alternative hypothesis that where there is already effective fisheries management, the closing of areas to all fishing will generate reductions in overall catches similar to the percentage of the fished area that is closed.

  17. Dynamics of fisheries, and the flexibility of vessel activity in Denmark between 1989 and 2001

    DEFF Research Database (Denmark)

    Ulrich, Clara; Andersen, Bo Sølgaard

    2004-01-01

    the activity of individual fishing vessels between 1989 and 2001. Initially, a typology of fisheries (classification of fishing trips) and vessel groups (classification of fishing vessels) was established through multivariate analyses of catch and effort data for 1999. In all, 54 fisheries and 25 vessel groups...... were identified. These typologies were then applied to all data for the whole time period, and the dynamics of fisheries and vessel groups investigated. The dynamics of vessels groups are studied both within groups (main and secondary fisheries, changes in activity patterns) and between groups...... (tracking of vessels shifting between groups). Results show average stability of vessel activity in terms of the main fishery, along with a great diversity of secondary fisheries and some possibilities for shifting between gears and areas. We conclude that the level of technical interactions is high...

  18. The cooperation between the Chinese Bureau of Fisheries and the Norwegian Directorate of fisheries%中挪渔业管理部门的合作

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@Activities 1994 In 1994 Peter Gullestad(Present Director General of Fisheries in Bergen) headed a Norwegian delegation visiting China. In his presentation of “The Norwegian experience in fisheries management and control” -he stressed the fact that overcapacity is “the root of all evil”. He also underlined that it is important not only to set up a legal system for fisheries management but also to establish reliable catch statistics. He further more pointed out that good scientific advice is the basic input for the management system.

  19. Improving the reliability of fishery predictions under climate change

    DEFF Research Database (Denmark)

    Brander, Keith

    2015-01-01

    The increasing number of publications assessing impacts of climate change on marine ecosystems and fisheries attests to rising scientific and public interest. A selection of recent papers, dealing more with biological than social and economic aspects, is reviewed here, with particular attention...... to the reliability of projections of climate impacts on future fishery yields. The 2014 Intergovernmental Panel on Climate Change (IPCC) report expresses high confidence in projections that mid- and high-latitude fish catch potential will increase by 2050 and medium confidence that low-latitude catch potential...... will decline. These levels of confidence seem unwarranted, since many processes are either absent from or poorly represented in the models used, data are sparse and, unlike terrestrial crop projections, there are no controlled experiments.This review discusses methodological issues that affect our...

  20. Trophodynamic indicators for an ecosystem approach to fisheries

    DEFF Research Database (Denmark)

    Cury, P. M.; Shannon, L. J.; Roux, J. P.;

    2005-01-01

    trophodynamic indicators derived from models, as well as from emergent patterns such as trophic cascades and regime shifts. From 46 indicators identified in the literature, six (catch or biomass ratios, primary production required to support catch, production or consumption ratios and predation mortality...... is evaluated to depict drastic and contrasted ecosystem changes. A few complementary indicators are suggested as needed to detect the trophodynamic impacts of fisheries and ecosystem changes. Trends in indicators are sensitive to the choice of trophic level made for certain species. Trophodynamic indicators...... appear to be conservative, because they respond slowly to large structural changes in an ecosystem. Application of the selected indicators to other marine ecosystems is encouraged so as to evaluate fully their usefulness to an ecosystem approach to fisheries, and to establish international comparability...

  1. Marine Stewardship Council certification of fisheries in Russia: a current status and prospects

    Directory of Open Access Journals (Sweden)

    Dmitry Liudvigovich Lajus

    2015-11-01

    Full Text Available Russia supports the sixth largest fisheries worldwide, which grew 25% during the last decade and is forecasted to grow 40% more up to 2020. Such voluminous and fast growing fisheries cause challenges for their sustainability. Marine Stewardship Council (MSC voluntary certification is now the most recognized system aimed to achieve sustainability of fisheries through informed choice of consumers. The certified fisheries benefit through recognition of MSC logo by consumers. The certificate is awarded to fisheries with a good status of target species and limited impact to structure and function of ecosystems, and to protected species. The recent research showed that MSC certified fisheries in average refer to healthier stocks than non-certified ones. Russia entered the program in the second half of the 2000s, and the first certificate was awarded in 2009. Now the MSC process in Russia is very intensive and currently involves thirteen fisheries, seven of them already are certified. The certified fisheries can be subdivided into three groups: (i set net Pacific salmon fisheries of the Far East, (ii bottom trawl codfish fisheries in the Barents Sea, and (iii pelagic trawl Alaska pollock fisheries in the Sea of Okhotsk. The total catch of fisheries involved in the MSC program now is about one-third for Pacific salmon, most of codfish and about a half for Alaska pollock. Process of MSC certifications in Russia faces various problems, caused by differences between western and Russian traditions of fishery management, difficulties of access to scientific information, insufficient support from governmental institutions, illegal fishing, insufficient independent observance, influence of hatcheries on salmon wild stocks and others. We believe that to improve sustainability of Russian fisheries, it is needed to demonstrate economical benefits of certification for those fisheries which are not involved in the program, to involve new fisheries in the process

  2. Commercial coral-reef fisheries across Micronesia: A need for improving management

    Science.gov (United States)

    Houk, P.; Rhodes, K.; Cuetos-Bueno, J.; Lindfield, S.; Fread, V.; McIlwain, J. L.

    2012-03-01

    A dearth of scientific data surrounding Micronesia's coral-reef fisheries has limited their formal assessment and continues to hinder local and regional management efforts. We approach this problem by comparing catch-based datasets from market landings across Micronesia to evaluate fishery status in the Commonwealth of the Northern Mariana Islands (CNMI), Guam, Yap, and Pohnpei. Initial examinations found that calm weather and low lunar illumination predicted between 6% (Yap) and 30% (CNMI) of the variances in daily commercial landings. Both environmentally driven catch success and daily catch variability increased in accordance with reef-fish demand indices. Subsequent insight from species composition and size-at-capture data supported these findings, highlighting reduced trophic levels and capture sizes where higher human-population-per-reef-area existed. Among the 12-15 target species and/or species complexes that accounted for 70% of the harvest biomass, capture sizes were consistently smallest for CNMI and Guam, often below the reported mean reproductive sizes. Comparatively, Pohnpei has the greatest potential for reef fisheries, with a large reef area (303 km2) and a moderate human population (34,000 people). However, the estimated harvest volume of 476 mt year-1 was 8-9 times higher than other jurisdictions. Even on Yap where the reef-fish demand index was lowest (67.7 people km-2 reef habitat), many target fish were harvested below their mean reproductive sizes, including the iconic green bumphead parrotfish and humphead wrasse, as well as several other herbivores. We discuss our results with respect to the contemporary doctrine surrounding size-spectra, catch composition, and catch frequencies that afford insight into fishery pressure and status. We posit that regional catch-based policies (initially) instituted at the market level, combined with area and gear-based restrictions, represent plausible vectors for improving Micronesian fisheries.

  3. Dynamic catch trends in the history of recreational spearfishing in Australia.

    Science.gov (United States)

    Young, Matthew A L; Foale, Simon; Bellwood, David R

    2015-06-01

    The sustained decline in marine fisheries worldwide underscores the need to understand and monitor fisheries trends and fisher behavior. Recreational fisheries are unique in that they are not subject to the typical drivers that influence commercial and artisanal fisheries (e.g., markets or food security). Nevertheless, although exposed to a different set of drivers (i.e., interest or relaxation), recreational fisheries can contribute to fishery declines. Recreational fisheries are also difficult to assess due to an absence of past monitoring and traditional fisheries data. Therefore, we utilized a nontraditional data source (a chronology of spearfishing publications) to document historical trends in recreational spearfishing in Australia between 1952 and 2009. We extracted data on reported fish captures, advertising, and spearfisher commentary and used regression models and ordination analyses to assess historical change. The proportion of coastal fish captures reported declined approximately 80%, whereas the proportion of coral reef and pelagic fish reports increased 1750% and 560%, respectively. Catch composition shifted markedly from coastal temperate or subtropical fishes during the 1950s to 1970s to coral reef and pelagic species in the 1990s to 2000s. Advertising data and commentary by spearfishers indicated that pelagic fish species became desired targets. The mean weight of trophy coral reef fishes also declined significantly over the study period (from approximately 30-8 kg). Recreational fishing presents a highly dynamic social-ecological interface and a challenge for management. Our results emphasize the need for regulatory agencies to work closely with recreational fishing bodies to observe fisher behavior, detect shifts in target species or fishing intensity, and adapt regulatory measures. PMID:25627009

  4. A mixed integer linear program for an integrated fishery

    OpenAIRE

    MB Hasan; JF Raffensperger

    2006-01-01

    In this paper fishing trawler scheduling and production planning for a quota-based integrated commercial fishery is modelled mathematically. The catch capacity of fishing trawlers and the capacity of processing firms are two major factors which influence the scheduling of fishing trawlers. Production planning in fish processing firms depends on steady supply of fresh fish from the fishing trawlers to the processing firms. We develop a mixed integer linear programming (MILP) model to co-ordina...

  5. The History and Characteristics of the Mobulid Ray Fishery in the Bohol Sea, Philippines

    Science.gov (United States)

    Tull, Malcolm

    2016-01-01

    The fishery for mobulid rays, also known as devil rays, has been practiced in the Bohol Sea for over a century yet very little is known about its history and characteristics. This study provides the first detailed description of the mobulid ray fishery in the Bohol Sea, Philippines. It describes the history and evolution of the fishery from the 19th century to 2013. It characterizes the fishery based on the species targeted, gears used, the organization, catch distribution, processing, monetary value, and the market of its by-products. This paper also analyses the changes that occurred through time, the management of the fishery and the drivers of the fishery. A multi-disciplinary approach was employed by combining ethno-historical research methods and catch landing monitoring in four primary sites within the Bohol Sea. This fishery began as an artisanal fishery using sail and row boats equipped with harpoons and gaff hooks practiced in at least four coastal villages in Bohol, Camiguin and Limasawa. The fishing fleet has decreased since the beginning of the 20th century however, with the motorization of the fishery and shift to the use of gillnets, the extent of the fishing grounds and market of the products have expanded. Four species of mobulid rays are caught in the Bohol Sea: Manta birostris, Mobula japanica, Mobula thurstoni and Mobula tarapacana. A fifth species, targeted by a fishing community off Dinagat as an off-shoot of the Bohol fishery is most likely the Manta alfredi. Currently, the fishery for mobulids is centered in Bohol Province where it has been practiced longest. The monetary value of mobulids in this region has increased and the dependence of fishing communities for their livelihood is significant. The unique characteristics of this fishery and the socio-cultural context within which it operates merits a thorough investigation in order to design the appropriate management strategy. PMID:27575536

  6. The History and Characteristics of the Mobulid Ray Fishery in the Bohol Sea, Philippines.

    Science.gov (United States)

    Acebes, Jo Marie V; Tull, Malcolm

    2016-01-01

    The fishery for mobulid rays, also known as devil rays, has been practiced in the Bohol Sea for over a century yet very little is known about its history and characteristics. This study provides the first detailed description of the mobulid ray fishery in the Bohol Sea, Philippines. It describes the history and evolution of the fishery from the 19th century to 2013. It characterizes the fishery based on the species targeted, gears used, the organization, catch distribution, processing, monetary value, and the market of its by-products. This paper also analyses the changes that occurred through time, the management of the fishery and the drivers of the fishery. A multi-disciplinary approach was employed by combining ethno-historical research methods and catch landing monitoring in four primary sites within the Bohol Sea. This fishery began as an artisanal fishery using sail and row boats equipped with harpoons and gaff hooks practiced in at least four coastal villages in Bohol, Camiguin and Limasawa. The fishing fleet has decreased since the beginning of the 20th century however, with the motorization of the fishery and shift to the use of gillnets, the extent of the fishing grounds and market of the products have expanded. Four species of mobulid rays are caught in the Bohol Sea: Manta birostris, Mobula japanica, Mobula thurstoni and Mobula tarapacana. A fifth species, targeted by a fishing community off Dinagat as an off-shoot of the Bohol fishery is most likely the Manta alfredi. Currently, the fishery for mobulids is centered in Bohol Province where it has been practiced longest. The monetary value of mobulids in this region has increased and the dependence of fishing communities for their livelihood is significant. The unique characteristics of this fishery and the socio-cultural context within which it operates merits a thorough investigation in order to design the appropriate management strategy. PMID:27575536

  7. Wild Estonian and Russian sea trout (Salmo trutta) in Finnish coastal sea trout catches: results of genetic mixed-stock analysis.

    Science.gov (United States)

    Koljonen, Marja-Liisa; Gross, Riho; Koskiniemi, Jarmo

    2014-12-01

    For responsible fisheries management of threatened species, it is essential to know the composition of catches and the extent to which fisheries exploit weak wild populations. The threatened Estonian, Finnish and Russian sea trout populations in the Gulf of Finland are targets of mixed-stock fisheries. The fish may originate from rivers with varying production capacities, from different countries, and they may also have either a wild or hatchery origin. In order to resolve the composition of Finnish coastal sea trout catches, we created a standardized baseline dataset of 15 DNA microsatellite loci for 59 sea trout populations around the Gulf of Finland and tested its resolution for mixed-stock analysis of 1372 captured fish. The baseline dataset provided sufficient resolution for reliable mixture analysis at regional group level, and also for most of the individual rivers stocks. The majority (76-80%) of the total catch originated from Finnish sea trout populations, 6-9% came from Russian and 12-15% from Estonian populations. Nearly all Finnish trout in the catch were of hatchery origin, while the Russian and Estonian trout were mostly of wild origin. The proportion of fish in the Finnish catches that originated from rivers with natural production was at least one fifth (22%, 19-23%). Two different spotting patterns were observed among the captured trout, with a small and sparsely spotted form being markedly more common among individuals of Russian (28%) and Estonian origin (22%) than among fish assigned to a Finnish origin (0.7%).

  8. The Mediterranean and Black Sea fisheries at risk from overexploitation.

    Directory of Open Access Journals (Sweden)

    Athanassios C Tsikliras

    Full Text Available The status of the Mediterranean and Black Sea fisheries was evaluated for the period 1970-2010 on a subarea basis, using various indicators including the temporal variability of total landings, the number of recorded stocks, the mean trophic level of the catch, the fishing-in-balance index and the catch-based method of stock classification. All indicators confirmed that the fisheries resources of the Mediterranean and Black Sea are at risk from overexploitation. The pattern of exploitation and the state of stocks differed among the western (W, central (C and eastern (E Mediterranean subareas and the Black Sea (BS, with the E Mediterranean and BS fisheries being in a worst shape. Indeed, in the E Mediterranean and the BS, total landings, mean trophic level of the catch and fishing-in-balance index were declining, the cumulative percentage of overexploited and collapsed stocks was higher, and the percentage of developing stocks was lower, compared to the W and C Mediterranean. Our results confirm the need for detailed and extensive stock assessments across species that will eventually lead to stocks recovering through conservation and management measures.

  9. Artisanal fisheries of the Xingu River basin in Brazilian Amazon.

    Science.gov (United States)

    Isaac, V J; Almeida, M C; Cruz, R E A; Nunes, L G

    2015-08-01

    The present study characterises the commercial fisheries of the basin of the Xingu River, a major tributary of the Amazon River, between the towns of Gurupá (at the mouth of the Amazon) and São Félix do Xingu. Between April, 2012, and March, 2014, a total of 23,939 fishing trips were recorded, yielding a total production of 1,484 tons of fish, harvested by almost three thousand fishers. The analysis of the catches emphasizes the small-scale and artisanal nature of the region's fisheries, with emphasis on the contribution of the motorised canoes powered by "long-tail" outboard motors. Larger motorboats operate only at the mouth of the Xingu and on the Amazon. Peacock bass (Cichla spp.), croakers (Plagioscion spp.), pacu (a group containing numerous serrasalmid species), aracu (various anostomids), and curimatã (Prochilodus nigricans) together contributed more than 60% of the total catch. Mean catch per unit effort was 18 kg/fisher-1.day-1, which varied among fishing methods (type of vessel and fishing equipment used), river sections, and time of the year. In most cases, yields varied little between years (2012 and 2013). The technical database provided by this study constitutes an important resource for the regulation of the region's fisheries, as well as for the evaluation of future changes resulting from the construction of the Belo Monte dam on the Xingu River.

  10. The Mediterranean and Black Sea fisheries at risk from overexploitation.

    Science.gov (United States)

    Tsikliras, Athanassios C; Dinouli, Anny; Tsiros, Vasileios-Zikos; Tsalkou, Eleni

    2015-01-01

    The status of the Mediterranean and Black Sea fisheries was evaluated for the period 1970-2010 on a subarea basis, using various indicators including the temporal variability of total landings, the number of recorded stocks, the mean trophic level of the catch, the fishing-in-balance index and the catch-based method of stock classification. All indicators confirmed that the fisheries resources of the Mediterranean and Black Sea are at risk from overexploitation. The pattern of exploitation and the state of stocks differed among the western (W), central (C) and eastern (E) Mediterranean subareas and the Black Sea (BS), with the E Mediterranean and BS fisheries being in a worst shape. Indeed, in the E Mediterranean and the BS, total landings, mean trophic level of the catch and fishing-in-balance index were declining, the cumulative percentage of overexploited and collapsed stocks was higher, and the percentage of developing stocks was lower, compared to the W and C Mediterranean. Our results confirm the need for detailed and extensive stock assessments across species that will eventually lead to stocks recovering through conservation and management measures. PMID:25793975

  11. CROATIAN FRESHWATER FISHERIES IN 1994

    Directory of Open Access Journals (Sweden)

    Mirko Turk

    1995-09-01

    Full Text Available Data on the production and catch of fish according to species, on the surface of the fish ponds, on the means of fish catching and on the distribution of the product and catch in 1994 is presented. The surface area used for production of fish has decreased by 274 ha or 2,51%. The total amount of fish has decreased by 1.263 tons or 14,78%. The highest production of fish was reached by the fish farm Donji Miholjac with 1.231 kg/ha. The feeding coefficient is 3,10 kg. Only on one fish farm was the feeding coefficient less than 2.0 kg (1,40 and on two large farms this coefficient was greater than 5,00 kg. The main fish food is still wheat followed by corn. The amount of fertilizer used was decreased by 14,40%. The fry carp growing ponds make up 0,92% of the surface area of the entire fish farm, the young carp ponds 21,77% and the culturing ponds for consumption fish 76,55%. The total amount of fish in the carp ponds was 660 kg/ha, and in the trout ponds it was 123.4 tons/ha. The carp is the highest produced fish with 80, 35%, then the herbivorous fish with 5,65 and all other fish make up 14% of the total production. In the structure of herbivorous fish the grass carp is leading with 54, 70%, followed by the big head carp with 25,54% and the silver carp with 19,76%. In comparison with the previous year the production of "all other fish- has significantly increased (287%, and sheat fish 18,90%, while the production of trench has decreased (71%. Fish catch in open waters has increased by 20,57% in comparison to the previous year. Carp made up 78,07% of the total production and catch of freshwater fish, the herbivorous fish made up 5,40%, trout 4,38%, the sheat fish, pike perch and pike 2,86% and all other fish species 9,28%. As far as the distribution of production and catch, 51,60% were sold on the market, 37,54% were used for reproduction (stocking the fish farms , mortalities were 6,35% and for personal use (sports fishing 4,50% was used. The number

  12. Nineteenth-century Ship-based Catches of Gray Whales, Eschrichtius robustus, in the Eastern North Pacific

    OpenAIRE

    Reeves, Randall R.; Smith, Tim D.; Lund, Judith N.; Lebo, Susan A.; Josephson , Elizabeth A.

    2010-01-01

    The 19th century commercial ship-based fishery for gray whales, Eschrichtius robustus, in the eastern North Pacific began in 1846 and continued until the mid 1870’s in southern areas and the 1880’s in the north. Henderson identified three periods in the southern part of the fishery: Initial, 1846–1854; Bonanza, 1855–1865; and Declining, 1866–1874. The largest catches were made by “lagoon whaling” in or immediately outside the whale population’s main wintering areas in Mexico—Magdalena Bay, Sc...

  13. 26 CFR 1.414(v)-1 - Catch-up contributions.

    Science.gov (United States)

    2010-04-01

    ...(v)-1 Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED) INCOME TAX (CONTINUED) INCOME TAXES Pension, Profit-Sharing, Stock Bonus Plans, Etc. § 1.414(v)-1 Catch-up contributions... applicable employer plan to comply with the universal availability requirement of section 414(v)(4)....

  14. 75 FR 55305 - Proposed Information Collection; Comment Request; Social Impacts of the Implementation of a Catch...

    Science.gov (United States)

    2010-09-10

    ... future assessments of fishermen and cover (1) Participation in sectors and the management process, (2... Conservation and Management Act (16 U.S.C. 1801 et seq.). The required information is used to evaluate the... the relative impacts of different management measures. Catch shares are being highly encouraged as...

  15. Maximum sustainable yield of Greater lizardfish Sauridatumbil fishery in Pakistan using the CEDA and ASPIC packages

    Institute of Scientific and Technical Information of China (English)

    KALHORO Muhsan Ali; LIU Qun; MEMON Khadim Hussain; WARYANI Baradi; SOOMRO Shamsher Hyder

    2015-01-01

    The catch and effort data analysis (CEDA) and ASPIC (a stock assessment production model incorporating covariat-es) computer software packages were used to estimate the maximum sustainable yield (MSY) from the catch and effort data of Greater lizardfish Saurida tumbil fishery of Pakistan from 1986 to 2009. In CEDA three surplus produc-tion models of Fox, Schaefer and Pella-Tomlinson were used. Here initial proportion (IP) of 0.5 was used because the starting catch was roughly 50%of the maximum catch. With IP=0.5, the estimated MSY from Fox model were 20.59 mt and 38.16 mt for normal and log-normal error assumptions, while the MSY from Schaefer and Pella-Tomlinson were 60.40, 60.40 and 60.40 mt, for normal, log-normal and gamma error assumptions respectively. The MSY values from Schaefer and Pella-Tomlinson models of three error assumptions were the same. The R2 values from those three models were above 0.6. When IP=0.5, the MSY values estimated from ASPIC from Fox were 132 mt, and from logistic model were 69.4 mt, with R2 value above 0.8. Therefore we suggest the MSY of S. tumbil fishery from Pakistan to be 60–70 mt, which is higher than the latest catch, thus we would recommend that the fishing efforts for this fishery may be kept at the current level.

  16. Fishery-induced changes in the subtropical Pacific pelagic ecosystem size structure: observations and theory.

    Directory of Open Access Journals (Sweden)

    Jeffrey J Polovina

    Full Text Available We analyzed a 16-year (1996-2011 time series of catch and effort data for 23 species with mean weights ranging from 0.8 kg to 224 kg, recorded by observers in the Hawaii-based deep-set longline fishery. Over this time period, domestic fishing effort, as numbers of hooks set in the core Hawaii-based fishing ground, has increased fourfold. The standardized aggregated annual catch rate for 9 small (15 kg it decreased about 50% over the 16-year period. A size-based ecosystem model for the subtropical Pacific captures this pattern well as a response to increased fishing effort. Further, the model projects a decline in the abundance of fishes larger than 15 kg results in an increase in abundance of animals from 0.1 to 15 kg but with minimal subsequent cascade to sizes smaller than 0.1 kg. These results suggest that size-based predation plays a key role in structuring the subtropical ecosystem. These changes in ecosystem size structure show up in the fishery in various ways. The non-commercial species lancetfish (mean weight 7 kg has now surpassed the target species, bigeye tuna, as the species with the highest annual catch rate. Based on the increase in snake mackerel (mean weight 0.8 kg and lancetfish catches, the discards in the fishery are estimated to have increased from 30 to 40% of the total catch.

  17. School students "Catch a Star"!

    Science.gov (United States)

    2007-04-01

    School students from across Europe and beyond have won prizes in an astronomy competition, including the trip of a lifetime to one of the world's most powerful astronomical observatories, on a mountaintop in Chile. ESO, the European Organisation for Astronomical Research in the Southern Hemisphere, together with the European Association for Astronomy Education (EAAE), has just announced the winners of the 2007 "Catch a Star!" competition. ESO PR Photo 21/07 "Catch a Star!" is an international astronomy competition for school students, in which students are invited to 'become astronomers' and explore the Universe. The competition includes two categories for written projects on astronomical themes, to ensure that every student, whatever their level, has the chance to enter and win exciting prizes. For the artistically minded, "Catch a Star!" also includes an astronomy-themed artwork competition. Students from 22 countries submitted hundreds of written projects and pieces of artwork. "The standard of entries was most impressive, and made the jury's task of choosing winners both enjoyable and difficult! We hope that everyone, whether or not they won a prize, had fun taking part, and learnt some exciting things about our Universe", said Douglas Pierce-Price, Education Officer at ESO. The top prize, of a week-long trip to Chile to visit the ESO Very Large Telescope (VLT) on Paranal, was won by students Jan Mestan and Jan Kotek from Gymnazium Pisek in the Czech Republic, together with their teacher Marek Tyle. Their report on "Research and Observation of the Solar Eclipse" told how they had studied solar eclipses, and involved their fellow students in observations of an eclipse from their school in 2006. The team will travel to Chile and visit the ESO VLT - one of the world's most powerful optical/infrared telescopes - where they will meet astronomers and be present during a night of observations on the 2600m high Paranal mountaintop. "It's fantastic that we will see the

  18. 2004年北太平洋柔鱼钓产量分析及作业渔场与表温的关系%The Catch Distribution of Ommastrephes batramii in Squid Jigging Fishery and the Relationship between Fishing Ground and SST in the North Pacific Ocean in 2004

    Institute of Scientific and Technical Information of China (English)

    陈新军; 刘必林

    2006-01-01

    Neon flying squid Ommastrephes batramii is widely distributed in the North Pacific Ocean, which has become the main fishing species for Chinese squid jigging fleets since 1993. Many authors have made the studies on the fields of fishing ground and its environment conditions. However, the squid catch per fishing vessel attained the highest level of about 550 t in 2004. In this paper, the catch and its distribution in 2004 would be compared with the previous year. Based on the catch data from Chinese squid jigging vessels and sea surface temperature with the format of 1°latitude by 1°longitude from May to November in 2004, the distribution maps were drawn by Marine explorer 4.0. The results show that the production in the east waters to 160°E was low during May and July. During October and November, the production in the waters from 150°E to 160°E was relatively higher, which occupied 62.5 percent of the total catch. During November, the production in the west waters to 150°E was also low. The highest CPUE area located in the west waters to 150°E, the next was the area from 150°E to 160°E and the lowest CPUE area located in the east waters to 160°E. The SST in the fishing ground seems to change seasonally. The suitable SST for each month is as follows: 12-14 ℃ in May, 15 ℃ - 16 ℃ in June, 14 ℃ - 16 ℃ in July, 18 ℃ - 19 ℃ in August, 16 ℃ -17 ℃ in September, 15 ℃- 16 ℃ in October and 12 ℃ - 13 ℃ in November. The result of K-S test shows that the above monthly suitable SST is considered as the indicator of looking for the main fishing ground.%根据2004年5 - 11月我国鱿钓船在北太平洋生产数据,结合表温资料,按经纬度1°×1°的格式,利用Marine explorer 4.0 软件作图进行分析.结果表明,5 - 7月在160°E以东海域作业,产量较低;8 - 10月在150°- 160°E海域作业,为生产作业的产量高峰期,占总产量的62.5%;11月在150oE以西海域作业,产量也较低.在150

  19. Climate modulates the effects of Sardinella aurita fisheries off Northwest Africa

    NARCIS (Netherlands)

    Zeeberg, J.J.; Corten, A.; Tjoe-Awie, P.; Coca, J.; Hamady, B.

    2008-01-01

    The fluctuating abundance of round sardinella (Sardinella aurita) in Mauritanian waters over the past ca. 20 years can be related to environmental dynamics off Northwest Africa. Trends in the fishery are evaluated using FAO data, acoustic surveys, and catch statistics from the EU fleet (1996-2006).

  20. 77 FR 65534 - Magnuson-Stevens Act Provisions; General Provisions for Domestic Fisheries; Application for...

    Science.gov (United States)

    2012-10-29

    ... means to achieve the annual catch limit (ACL) for a rebuilt, but largely inaccessible, redfish resource...) process and marketing; and (6) outreach and implementation. Components one and two have been completed... fishery (see the Notice and Request for Comments from March 8, 2011 (76 FR 12716)). This EFP, which...

  1. Fishing power increases from technological development in the Faroe Islands longline fishery

    NARCIS (Netherlands)

    Eigaard, O.R.; Thomsen, B.; Hovgaard, H.; Nielsen, A.; Rijnsdorp, A.D.

    2011-01-01

    During an effort-regulated period from 1996 to 2002, unregistered annual increases of 0.3% of hooks fished per day were demonstrated for the Faroe Islands longline fishery. However, annual increases were higher (1.5%) during a preceding total allowable catch regulated period, thereby invalidating an

  2. 76 FR 65662 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Coastal Migratory Pelagic...

    Science.gov (United States)

    2011-10-24

    ..., which would be inconsistent with the Magnuson-Stevens Act National Standard 1 guidelines (74 FR 3178... intent of this rule is to specify ACLs for species not undergoing overfishing while maintaining catch... fisheries determined by the Secretary of Commerce (Secretary) to not be subject to overfishing, ACLs and...

  3. Climate modulates the effects of Sardinella aurita fisheries off Northwest Africa

    NARCIS (Netherlands)

    Zeeberg, J.J.; Corten, A.A.H.M.; Tjoe-Awie, P.J.; Coca, J.; Hamady, H.

    2008-01-01

    The fluctuating abundance of round sardinella (Sardinella aurita) in Mauritanian waters over the past ca. 20 years can be related to environmental dynamics off Northwest Africa. Trends in the fishery are evaluated using FAO data, acoustic surveys, and catch statistics from the EU fleet (1996¿2006).

  4. 76 FR 34903 - Revisions to Framework Adjustment 45 to the Northeast Multispecies Fishery Management Plan and...

    Science.gov (United States)

    2011-06-15

    ... operations plans and allocating ACE to sectors for FY 2011 (76 FR 23076; ``sector rule''). The sector rule... requested comments on this definition (76 FR 23076), as well as comments on the final sector rosters... Adjustment 45 to the Northeast Multispecies Fishery Management Plan and Sector Annual Catch...

  5. Why are prices in wild catch and aquaculture industries so different?

    Science.gov (United States)

    Villasante, Sebastián; Rodríguez-González, David; Antelo, Manel; Rivero-Rodríguez, Susana; Lebrancón-Nieto, Joseba

    2013-12-01

    Through a comparative analysis of prices in capture fisheries and aquaculture sectors, the objectives of this paper are a) to investigate three the trends in prices of forage catches to feed the aquaculture species, b) to analyze the amount of fish species need to feed aquaculture species in order to assess the level of efficiency in resource use, and c) to examine the degree of economic concentration either in wild-catch industry and aquaculture sectors. The results show that prices of cultivated species are higher than prices of the same species when harvested from the sea. We explain this fact by the interplay of three forces. First, the amount of wild fish to feed aquaculture species continues to improve over time. Second, the pressure of fishing activities has not been reduced since catches of most forage fishes are declining, which induce higher prices of capture species that feed aquaculture production. Third, the level of seafood market concentration is significantly higher in aquaculture than in wild catches, which generates higher prices in aquaculture.

  6. Jointness through fishing days input in a multi-species fishery

    DEFF Research Database (Denmark)

    Hansen, Lars Gårn; Jensen, Carsten Lynge

    are targeted individually and by-catch is negligible, but over the fishing season the same boat chooses to target several species with varying intensity which also results in a sort of jointness. Both types of fisheries are typically modelled using standard multi-input multi-output profit function forms (e.......g. translog, normalized quadratic). In this paper we argue that jointness in the latter, essentially separable fishery is caused by allocation of fishing days input among harvested species. We developed a structural model of a multi-species fishery where the allocation of fishing days input causes production...

  7. Fishery and Aquaculture Relationship in the Mediterranean: Present and Future

    Directory of Open Access Journals (Sweden)

    G. RELINI

    2012-12-01

    Full Text Available Although the Mediterranean represents only 0.8% of the world seas, it is the site of a very long-established fishing activity, characterized mainly by multispecific catch and by artisanal or coastal activity, resulting from a mosaic of very diversified structures and gears, along more than 45,000 km of coastline. Two main biological features of this sea are the occurrence of a large richness of species (it represents 5.5% - 7% of world marine fauna and 16.6% of macrophyta, which stands in contrast with its ‘trophic poverty’ and the absence of large monospecific fishery, except for some small and large pelagic fish. Another biological characteristic of Mare Nostrumis the high invasion of exotic species, some exploited by fishery and aquaculture, some others quite dangerous. For the entire Mediterranean and Black Sea, the production (catch + aquaculture had been steadily increasing over the period 1972-1988 from 1,140,000 t to 2,080,000 t . The period 1988-1991 has shown a drastic drop in catches (in 1991: 1,400,000 t. From 1990 to 1995 the total catch increased to 1,701,379 t then decreased and in 2000 reached 1,485,046 t . In 2000 Turkey had the first place with 496,174 t, 26.9% of the total value (1,846,026 t, including fishing and aquaculture, followed by Italy with 25%, Greece 9%, Spain 7.6% and Algeria 5.4%. As in many parts of the world, aquaculture production in the Mediterranean is rapidly expanding. In 1970 the total aquaculture production was about 18,297 t of which 74.3% produced in Italy. In 2000 a value of 358,614 t was reached, about 1/4 of the total fishery catch, while the world aquaculture production corresponds to half of the world total catch. Italy is still the main producer with 46.7% , followed by Greece with 21.5%, Turkey 9.9% and France 6.7%. A sharp drop in the production of the European eel ( Anguilla anguilla and of the European flat oyster ( Ostrea edulis is recorded. Positive and negative interactions between

  8. A mixed integer linear program for an integrated fishery

    Directory of Open Access Journals (Sweden)

    MB Hasan

    2006-06-01

    Full Text Available In this paper fishing trawler scheduling and production planning for a quota-based integrated commercial fishery is modelled mathematically. The catch capacity of fishing trawlers and the capacity of processing firms are two major factors which influence the scheduling of fishing trawlers. Production planning in fish processing firms depends on steady supply of fresh fish from the fishing trawlers to the processing firms. We develop a mixed integer linear programming (MILP model to co-ordinate trawler scheduling, fishing, processing, and labour allocation of quota based integrated fisheries. We demonstrate the workability of our model with a numerical example and sensitivity analysis based on data obtained from one of the major fisheries in New Zealand.

  9. Linking effort and fishing mortality in a mixed fisheries model

    DEFF Research Database (Denmark)

    Thøgersen, Thomas Talund; Hoff, Ayoe; Frost, Hans Staby

    2012-01-01

    Since the implementation of the Common Fisheries Policy of the European Union in 1983, the management of EU fisheries has been enormously challenging. The abundance of many fish stocks has declined because too much fishing capacity has been utilised on healthy fish stocks. Today, this decline...... fisheries), while simultaneously optimising the overall economic performance of the fleets. The so-called FcubEcon model, in particular, has elucidated both the biologically and economically optimal method for allocating catches—and thus effort—between fishing fleets, while ensuring that the quotas...... the biological catch equation with the economic production function. Furthermore, the SOMER model relaxes the assumption of the joint production of fishing metiers, unique and separately defined sub-fleets, to allow for more detail regarding the flexibility to target specific groups of species. Thereby...

  10. The good, the bad and the ugly of marine reserves for fishery yields.

    Science.gov (United States)

    De Leo, Giulio A; Micheli, Fiorenza

    2015-11-01

    Marine reserves (MRs) are used worldwide as a means of conserving biodiversity and protecting depleted populations. Despite major investments in MRs, their environmental and social benefits have proven difficult to demonstrate and are still debated. Clear expectations of the possible outcomes of MR establishment are needed to guide and strengthen empirical assessments. Previous models show that reserve establishment in overcapitalized, quota-based fisheries can reduce both catch and population abundance, thereby negating fisheries and even conservation benefits. By using a stage-structured, spatially explicit stochastic model, we show that catches under quota-based fisheries that include a network of MRs can exceed maximum sustainable yield (MSY) under conventional quota management if reserves provide protection to old, large spawners that disproportionally contribute to recruitment outside the reserves. Modelling results predict that the net fishery benefit of MRs is lost when gains in fecundity of old, large individuals are small, is highest in the case of sedentary adults with high larval dispersal, and decreases with adult mobility. We also show that environmental variability may mask fishery benefits of reserve implementation and that MRs may buffer against collapse when sustainable catch quotas are exceeded owing to stock overestimation or systematic overfishing. PMID:26460129

  11. Identification and evaluation of shark bycatch in Georgia's commercial shrimp trawl fishery with implications for management

    Science.gov (United States)

    Belcher, C.N.; Jennings, C.A.

    2011-01-01

    Many US states have recreational and commercial fisheries that occur in nursery areas occupied by subadult sharks and can potentially affect their survival. Georgia is one of few US states without a directed commercial shark fishery, but the state has a large, nearshore penaeid shrimp trawl fishery in which small sharks occur as bycatch. During our 1995–1998 investigation of bycatch in fishery-dependent sampling events, 34% of 127 trawls contained sharks. This bycatch totalled 217 individuals from six species, with Atlantic sharpnose shark, Rhizoprionodon terraenovae (Richardson), the most common and finetooth shark, Carcharhinus isodon (Müller & Henle) and spinner shark, Carcharhinus brevipinna (Müller & Henle), the least common. The highest catch rates for sharks occurred during June and July and coincided with the peak months of the pupping season for many species. Trawl tow speed and tow time did not significantly influence catch rates for shark species. Gear configurations [net type, turtle excluder device (TED), bycatch reduction device] affected catch rates for shark species. Results of this study indicate gear restrictions, a delayed season opening, or reduced bar spacing on TEDs may reduce shark bycatch in this fishery.

  12. Supply regimes in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max

    2006-01-01

    -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......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......, the traditional understanding of supply regimes in fisheries needs modification. This paper identifies through a case study of the East Baltic cod fishery supply regimes in fisheries, taking alternative fisheries management schemes and mesh size limitations into account. An age-structured Beverton-Holt based bio...

  13. Social and Ecological Dynamics of Small-Scale Fisheries

    Science.gov (United States)

    Stevens, K.; Kramer, D.; Frank, K.

    2012-12-01

    Globalization's reach is rapidly extending to touch some of the most remote communities of the world, but we have yet to understand its scale and impact. On Nicaragua's previously remote Miskitu Coast, the introduction of new markets and global demand for seafood has resulted in changes in fishermen's harvest behavior manifested within the local fishery. Small-scale fisheries are a significant component in sustaining global fish trade, ensuring food security, and alleviating poverty, but because the fishermen are disperse, numerous and located in remote areas, the social and ecological dynamics of the system are poorly understood. Previous work has indicated a decline in fish abundance as a result of connection to markets, yet fishermen's response to this decline and the resulting shift in harvest strategy requires further examination. I identify the ecological and social factors that explain changes in fishermen behavior and use an innovative application of social network analysis to understand these changes. I also use interviews with fishermen and fishery-dependent surveys to measure catch and release behavior and seasonal gear use. Results demonstrate multiple cliques within a community that mitigate the response of fishermen to changes in the fishery. This research applies techniques in social science to address challenges in sustainable management of fisheries. As fisheries managers consider implementing new regulations, such as seasonal restrictions on gear, it is essential to understand not just how this might impact fish abundance, but how and why human systems respond as they do.

  14. Management of and economic returns from selected fisheries in the Nordic Countries

    DEFF Research Database (Denmark)

    Nielsen, Max; Flaaten, Ola; Waldö, Staffan

    2012-01-01

    There is potential to increase the economic returns in many fisheries by improving fisheries management. In this article, maximum and estimated current resource rents are analyzed using a standardized methodology for five case studies of fisheries with different management regimes: individual...... characteristics other than management might influence the estimated resource rent, and the results are discussed in relation to biological sustainability. The method used across fisheries and countries for the estimation of the current economic rent, based on standardized opportunity costs of labor and capital...... quotas (Norway), individual transferable quotas (Iceland), co-management (Denmark), vessel catch limits (Sweden), and tradable days-at-sea regulation (Faroe Islands). The Danish co-managed fishery had the highest estimated current rent, corresponding to 51% of landing value compared to a maximum rent...

  15. The spatial expansion and ecological footprint of fisheries (1950 to present.

    Directory of Open Access Journals (Sweden)

    Wilf Swartz

    Full Text Available Using estimates of the primary production required (PPR to support fisheries catches (a measure of the footprint of fishing, we analyzed the geographical expansion of the global marine fisheries from 1950 to 2005. We used multiple threshold levels of PPR as percentage of local primary production to define 'fisheries exploitation' and applied them to the global dataset of spatially-explicit marine fisheries catches. This approach enabled us to assign exploitation status across a 0.5° latitude/longitude ocean grid system and trace the change in their status over the 56-year time period. This result highlights the global scale expansion in marine fisheries, from the coastal waters off North Atlantic and West Pacific to the waters in the Southern Hemisphere and into the high seas. The southward expansion of fisheries occurred at a rate of almost one degree latitude per year, with the greatest period of expansion occurring in the 1980s and early 1990s. By the mid 1990s, a third of the world's ocean, and two-thirds of continental shelves, were exploited at a level where PPR of fisheries exceed 10% of PP, leaving only unproductive waters of high seas, and relatively inaccessible waters in the Arctic and Antarctic as the last remaining 'frontiers.' The growth in marine fisheries catches for more than half a century was only made possible through exploitation of new fishing grounds. Their rapidly diminishing number indicates a global limit to growth and highlights the urgent need for a transition to sustainable fishing through reduction of PPR.

  16. 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.

  17. Biodiveristy and Stability of Aboriginal Salmon Fisheries in the Fraser River Watershed

    Science.gov (United States)

    Nesbitt, H. K.; Moore, J.

    2015-12-01

    Natural watersheds are hierarchical networks that may confer stability to ecosystem functions through integration of upstream biodiversity, whereby upstream asset diversification stabilizes the aggregate downstream through the portfolio effect. Here we show that riverine structure and its associated diversity confer stability of salmon catch and lengthened fishing seasons for Aboriginal fisheries on the Fraser River (1370km) in BC, Canada, the second longest dam-free salmon migration route in North America. In Canada, Aboriginal people have rights to fish for food, social, and ceremonial (FSC) purposes. FSC fisheries are located throughout the Fraser watershed and have access to varying levels of salmon diversity based on their location. For instance, fisheries at the mouth of the river have access to all of the salmon that spawn throughout the entire watershed, thus integrating across the complete diversity profile of the entire river. In contrast, fisheries in the headwaters have access to fewer salmon species and populations and thus fish from a much less diverse portfolio. These spatial gradients of diversity within watersheds provide a natural contrast for quantifying the effects of different types of diversity on interannual resource stability and seasonal availability. We acquired weekly and yearly catch totals from 1983 to 2012 (30 years) for Chinook, chum, coho, pink, and sockeye salmon for 21 FSC fishing sites throughout the Fraser River watershed from Fisheries and Oceans Canada. We examined how both population- and species-level diversity affects catch stability and season length at each site by quantifying year-to-year variability and within-year season length respectively. Salmon species diversity made fisheries up to 28% more stable in their catch than predicted with 3.7 more weeks to fish on average. Fisheries with access to high population diversity had up to 3.8 times more stable catch and 3 times longer seasons than less diverse fisheries. We

  18. A corporate-crime perspective on fisheries

    DEFF Research Database (Denmark)

    Jensen, Frank; Nøstbakken, Linda

    2016-01-01

    The existing fisheries economics literature analyzes compliance problems by treating the fishing firm as one cohesive unit, but in many cases violations are committed by agents acting on behalf of a firm. To account for this, we analyze the principal–agent relationship within the fishing firm...... efficient fisheries policy. We show that without wage frictions, it does not matter who is held liable. However, under the commonly used share systems of remuneration, crew liability generally yields a more efficient outcome than firm liability. Furthermore, asset restrictions may affect the outcome under...

  19. Comparative evaluation of a mixed-fisheries effort-management system based on the Faroe Islands example

    DEFF Research Database (Denmark)

    Baudron, Alan; Ulrich, Clara; Nielsen, J. Rasmus;

    2010-01-01

    Total allowable catch (TAC) management has in many fisheries, especially mixed fisheries, failed to meet conservation objectives. For instance, for the Faroe Plateau mixed demersal fisheries, the TAC system failed to achieve the objective of an average annual fishing mortality of 0.45 for the three...... gadoid stocks cod (Gadus morhua), haddock (Melanogrammus aeglefinus), and saithe (Pollachius virens). Therefore, in 1996, an effort-regulation system with individual transferable effort quotas was introduced to manage the fisheries. Experience has shown that effort management without additional stock......-specific measures may not be appropriate for such fisheries. A management strategy evaluation model was developed to compare an effort-management system based on the Faroese example with a TAC system as currently applied in EU fisheries. Results show that when stocks are considered in isolation, a total allowable...

  20. Muskie Lunacy: does the lunar cycle influence angler catch of muskellunge (Esox masquinongy?

    Directory of Open Access Journals (Sweden)

    Mark R Vinson

    Full Text Available We analyzed angling catch records for 341,959 muskellunge (Esox masquinongy from North America to test for a cyclic lunar influence on the catch. Using periodic regression, we showed that the number caught was strongly related to the 29-day lunar cycle, and the effect was consistent across most fisheries. More muskellunge were caught around the full and new moon than at other times. At night, more muskellunge were caught around the full moon than the new moon. The predicted maximum relative effect was ≈5% overall. Anglers fishing exclusively on the peak lunar day would, on average, catch 5% more muskellunge than anglers fishing on random days. On some lakes and at night, the maximum relative effect was higher. We obtained angler effort data for Wisconsin, Mille Lacs (MN, and Lake Vermilion (MN. For Lake Vermilion there was a significant effect of the lunar cycle on angler effort. We could therefore not conclude that the lunar effect on catch was due to an effect on fish behavior alone. Several factors affected the amount of variation explained by the lunar cycle. The lunar effect was stronger for larger muskellunge (>102 cm than for smaller fish, stronger in midsummer than in June or October, and stronger for fish caught at high latitudes (>48°N than for fish caught further south. There was no difference in the lunar effect between expert and novice muskellunge anglers. We argue that this variation is evidence that the effect of the lunar cycle on catch is mediated by biological factors and is not due solely to angler effort and reflects lunar synchronization in feeding. This effect has been attributed to variation among moon phases in lunar illumination, but our results do not support that hypothesis for angler-caught muskellunge.

  1. Analysis on Marine Fishery Industrial Structure Evolution of the blue economic zone of Shandong peninsula-Based on Shift-share Method%基于偏离份额模型的山东半岛蓝区海洋渔业产业结构演进分析

    Institute of Scientific and Technical Information of China (English)

    于谨凯; 朱小苏

    2015-01-01

    Based on Shift -share Method ,this paper analyses the three indicators - regional growth share、industrial structure share and regional shift -share of the Marine fishery industry from to in the blue economic zone of Shandong peninsula with China as the reference district .The results show that it is still in the“primary、secondary、tertiary” starting stage of its industrial structure evolution :the pro‐portion of the primary industry in Marine fishery industry in Shandong Province declines steadily ,but the proportion of marine fishing industry in it remains high ;Though the proportion of the secondary industry gradually increases ,there is much room for adjusting the internal structure ;The tertiary in‐dustry develops slowly and is lack of competitiveness .Based on the problems referred ,there are several measures to optimize the industrial structure of Marine fishery :Adhere to the “Mari culture-based”policy ;Optimize the structure of Marine fishing industry ;Develop the advanced processing industry of aquatic products ;Improve the development of the tertiary industry .%运用偏离份额模型,以全国为参考大区,分析了1993-2012年山东半岛蓝区海洋渔业的份额分量N、竞争力偏离分量P、结构偏离分量D。研究结果表明,蓝区海洋渔业仍处于结构演进的“一、二、三”起步阶段:第一产业比重稳步下降,但其中海洋捕捞所占比重依然过大;第二产业比重逐步提高,但产业内部结构存在调整空间;第三产业发展缓慢,缺乏竞争力。根据上述问题,建议通过坚持“以养为主”方针,优化海洋捕捞生产结构,加快发展水产品后续深度加工工业,稳步推进第三产业发展,最终实现海洋渔业产业结构优化。

  2. Toward fisheries sustainability in North America: Issues, challenges, and strategies for action

    Science.gov (United States)

    MacDonald, D.D.; Knudsen, E.E.

    2004-01-01

    Many fisheries in North America are severely depleted and trending downwards. In an effort to find ways of reversing this disturbing situation, the American Fisheries Society and the Sustainable Fisheries Foundation invited leading experts in fisheries science and aquatic resource management to share their thoughts and insights in this book. These experts were asked to identify the factors that are currently impairing our ability to effectively manage fisheries resources and propose creative solutions for addressing the most challenging issues affecting fisheries sustainability. Based on the information that was provided by the experts (i.e., as presented in the earlier chapters of this book), it is apparent that a wide range of human activities are adversely affecting our shared fisheries resources and the aquatic habitats upon which they depend. The most challenging problems stem from causes that are largely beyond the scope of traditional fisheries management (e.g., human population growth, resource consumption patterns, global climate change, broad land-use patterns). It is also apparent that resolution of these challenges will require a new approach to fisheries management - one that effectively integrates economic, social, and environmental interests into a decision-making framework that supports fisheries sustainability. The key strategies for supporting such a transition toward a more holistic and comprehensive approach to managing the human activities that influence fisheries and aquatic resources are summarized in this chapter. ?? 2004 by the American Fisheries Society.

  3. 50 CFR 80.12 - Cost sharing.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 6 2010-10-01 2010-10-01 false Cost sharing. 80.12 Section 80.12 Wildlife... WILDLIFE RESTORATION AND DINGELL-JOHNSON SPORT FISH RESTORATION ACTS § 80.12 Cost sharing. Federal participation is limited to 75 percent of eligible costs incurred in the completion of approved work or...

  4. California Pelagic Longline Fishery

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains catch and effort, landings, and observer data from longline vessels fishing in the North Pacific outside the U.S. west coast EEZ. Logbooks...

  5. [Effects of macro-jellyfish abundance dynamics on fishery resource structure in the Yangtze River estuary and its adjacent waters].

    Science.gov (United States)

    Shan, Xiu-Juan; Zhuang, Zhi-Meng; Jin, Xian-Shi; Dai, Fang-Qun

    2011-12-01

    Based on the bottom trawl survey data in May 2007 and May and June 2008, this paper analyzed the effects of the abundance dynamics of macro-jellyfish on the species composition, distribution, and abundance of fishery resource in the Yangtze River estuary and its adjacent waters. From May 2007 to June 2008, the average catch per haul and the top catch per haul of macro-jellyfish increased, up to 222.2 kg x h(-1) and 1800 kg x h(-1) in June 2008, respectively. The macro-jellyfish were mainly distributed in the areas around 50 m isobath, and not beyond 100 m isobath where was the joint front of the coastal waters of East China Sea, Yangtze River runoff, and Taiwan Warm Current. The main distribution area of macro-jellyfish in June migrated northward, as compared with that in May, and the highest catches of macro-jellyfish in May 2007 and May 2008 were found in the same sampling station (122.5 degrees E, 28.5 degrees N). In the sampling stations with higher abundance of macro-jellyfish, the fishery abundance was low, and the fishery species also changed greatly, mainly composed by small-sized species (Trachurus japonicus, Harpadon nehereus, and Acropoma japonicum) and pelagic species (Psenopsis anomala, Octopus variabilis) and Trichiurus japonicus, and P. anomala accounted for 23.7% of the total catch in June 2008. Larimichthys polyactis also occupied higher proportion of the total catch in sampling stations with higher macro-jellyfish abundance, but the demersal species Lophius litulon was not found, and a few crustaceans were collected. This study showed that macro-jellyfish had definite negative effects on the fishery community structure and abundance in the Yangtze River estuary fishery ecosystem, and further, changed the energy flow patterns of the ecosystem through cascading trophic interactions. Therefore, macro-jellyfish was strongly suggested to be an independent ecological group when the corresponding fishery management measures were considered.

  6. 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.

  7. 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).

  8. Interactions between harbour seals (Phoca vitulina and coastal fisheries along the Swedish west coast: an overview

    Directory of Open Access Journals (Sweden)

    Karl Lundström

    2010-09-01

    Full Text Available The conflicts between seals and fisheries along the Swedish west coast have intensified during the last decades, concurrently with the increase in the harbour seal population size. This study presents published information about interactions between harbour seals and fisheries in the Kattegat-Skagerrak, in addition to new information on the seal by-catch rate and an overview of fisheries suffering from seal damage. Several fisheries have reported interactions with seals, principally fisheries with fyke nets, gill nets and static gear. Development of mitigation measures has been focused on the eel fishery with fyke nets, in which the use of stronger net material has significantly decreased the damage frequency from seals and has yet maintained the catches at satisfactory levels. Under-water filming at fyke nets together with studies of the prey preferences of seals has shown individual specializations in certain foraging techniques. For example, eel may not be a common prey for harbour seals in general, but, it was chosen in preference to other species by seals attacking fyke nets. There is a lack of current data concerning the diet of harbour seals. Previous studies, based on material from the 1970s and 1980s, have shown that locally and seasonally abundant prey is preferred. Due to the non-existent information about the foodchoice, current assessments of the ecological role of harbour seals in Sweden cannot be evaluated.

  9. 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

  10. Sustainable Fisheries in Southeast Asia

    OpenAIRE

    Melda Kamil Ariadno

    2011-01-01

    Fisheries activity has increased significantly in number. As a result, we might see high investment in fisheries is due to the high demand for fish and fisheries products. Therefore, marine resources as well as other living resources are at risk in being harmed by excessive fisheries activities, for example: the use of trawl. Indonesia, as a Maritime State, need to impose sustainable fisheries because the principle of utilizing sustainable fisheries resources as adopted in the Law on Fish...

  11. Marine mammal impacts in exploited ecosystems: would large scale culling benefit fisheries?

    Science.gov (United States)

    Morissette, Lyne; Christensen, Villy; Pauly, Daniel

    2012-01-01

    Competition between marine mammals and fisheries for marine resources-whether real or perceived-has become a major issue for several countries and in international fora. We examined trophic interactions between marine mammals and fisheries based on a resource overlap index, using seven Ecopath models including marine mammal groups. On a global scale, most food consumed by marine mammals consisted of prey types that were not the main target of fisheries. For each ecosystem, the primary production required (PPR) to sustain marine mammals was less than half the PPR to sustain fisheries catches. We also developed an index representing the mean trophic level of marine mammal's consumption (TL(Q)) and compared it with the mean trophic level of fisheries' catches (TL(C)). Our results showed that overall TL(Q) was lower than TL(C) (2.88 versus 3.42). As fisheries increasingly exploit lower-trophic level species, the competition with marine mammals may become more important. We used mixed trophic impact analysis to evaluate indirect trophic effects of marine mammals, and in some cases found beneficial effects on some prey. Finally, we assessed the change in the trophic structure of an ecosystem after a simulated extirpation of marine mammal populations. We found that this lead to alterations in the structure of the ecosystems, and that there was no clear and direct relationship between marine mammals' predation and the potential catch by fisheries. Indeed, total biomass, with no marine mammals in the ecosystem, generally remained surprisingly similar, or even decreased for some species.

  12. Marine mammal impacts in exploited ecosystems: would large scale culling benefit fisheries?

    Directory of Open Access Journals (Sweden)

    Lyne Morissette

    Full Text Available Competition between marine mammals and fisheries for marine resources-whether real or perceived-has become a major issue for several countries and in international fora. We examined trophic interactions between marine mammals and fisheries based on a resource overlap index, using seven Ecopath models including marine mammal groups. On a global scale, most food consumed by marine mammals consisted of prey types that were not the main target of fisheries. For each ecosystem, the primary production required (PPR to sustain marine mammals was less than half the PPR to sustain fisheries catches. We also developed an index representing the mean trophic level of marine mammal's consumption (TL(Q and compared it with the mean trophic level of fisheries' catches (TL(C. Our results showed that overall TL(Q was lower than TL(C (2.88 versus 3.42. As fisheries increasingly exploit lower-trophic level species, the competition with marine mammals may become more important. We used mixed trophic impact analysis to evaluate indirect trophic effects of marine mammals, and in some cases found beneficial effects on some prey. Finally, we assessed the change in the trophic structure of an ecosystem after a simulated extirpation of marine mammal populations. We found that this lead to alterations in the structure of the ecosystems, and that there was no clear and direct relationship between marine mammals' predation and the potential catch by fisheries. Indeed, total biomass, with no marine mammals in the ecosystem, generally remained surprisingly similar, or even decreased for some species.

  13. Storage of catch crops to produce biogas

    DEFF Research Database (Denmark)

    Molinuevo-Salces, Beatriz; Ahring, Birgitte Kiær; Uellendahl, Hinrich

    2014-01-01

    Catch crop biomass is a promising co-substrate for manure-based biogas plants in Denmark since the cultivation of catch crops is mandatory to retain nutrients in the soil, contributing to protect the aquatic environment. In general, the growth period for catch crops is from harvest of the previous...... crop in July-August to the end of the growing season and harvest in late October. Hence, for use of the biomass in biogas production there is a need for storage of the biomass. Storage as silage would guarantee the availability of the feedstock for biogas production during the whole year. A proper...... ensiling process determines the storage loss and the quality of the final silage and, thus, the possible use of it as a substrate for biogas production. Moreover, silage has been considered as a pre-treatment since it partially hydrolyses organic matter improving cellulose convertibility. Since a large...

  14. Improving electrofishing catch consistency by standardizing power

    Science.gov (United States)

    Burkhardt, Randy W.; Gutreuter, Steve

    1995-01-01

    The electrical output of electrofishing equipment is commonly standardized by using either constant voltage or constant amperage, However, simplified circuit and wave theories of electricity suggest that standardization of power (wattage) available for transfer from water to fish may be critical for effective standardization of electrofishing. Electrofishing with standardized power ensures that constant power is transferable to fish regardless of water conditions. The in situ performance of standardized power output is poorly known. We used data collected by the interagency Long Term Resource Monitoring Program (LTRMP) in the upper Mississippi River system to assess the effectiveness of standardizing power output. The data consisted of 278 electrofishing collections, comprising 9,282 fishes in eight species groups, obtained during 1990 from main channel border, backwater, and tailwater aquatic areas in four reaches of the upper Mississippi River and one reach of the Illinois River. Variation in power output explained an average of 14.9% of catch variance for night electrofishing and 12.1 % for day electrofishing. Three patterns in catch per unit effort were observed for different species: increasing catch with increasing power, decreasing catch with increasing power, and no power-related pattern. Therefore, in addition to reducing catch variation, controlling power output may provide some capability to select particular species. The LTRMP adopted standardized power output beginning in 1991; standardized power output is adjusted for variation in water conductivity and water temperature by reference to a simple chart. Our data suggest that by standardizing electrofishing power output, the LTRMP has eliminated substantial amounts of catch variation at virtually no additional cost.

  15. To fish or not to fish: factors at multiple scales affecting artisanal fishers' readiness to exit a declining fishery.

    Directory of Open Access Journals (Sweden)

    Tim M Daw

    Full Text Available Globally, fisheries are challenged by the combined impacts of overfishing, degradation of ecosystems and impacts of climate change, while fisheries livelihoods are further pressured by conservation policy imperatives. Fishers' adaptive responses to these pressures, such as exiting from a fishery to pursue alternative livelihoods, determine their own vulnerability, as well as the potential for reducing fishing effort and sustaining fisheries. The willingness and ability to make particular adaptations in response to change, such as exiting from a declining fishery, is influenced by economic, cultural and institutional factors operating at scales from individual fishers to national economies. Previous studies of exit from fisheries at single or few sites, offer limited insight into the relative importance of individual and larger-scale social and economic factors. We asked 599 fishers how they would respond to hypothetical scenarios of catch declines in 28 sites in five western Indian Ocean countries. We investigated how socioeconomic variables at the individual-, household- and site-scale affected whether they would exit fisheries. Site-level factors had the greatest influence on readiness to exit, but these relationships were contrary to common predictions. Specifically, higher levels of infrastructure development and economic vitality - expected to promote exit from fisheries - were associated with less readiness to exit. This may be due to site level histories of exit from fisheries, greater specialisation of fishing households, or higher rewards from fishing in more economically developed sites due to technology, market access, catch value and government subsidies. At the individual and household scale, fishers from households with more livelihood activities, and fishers with lower catch value were more willing to exit. These results demonstrate empirically how adaptive responses to change are influenced by factors at multiple scales, and

  16. An Evaluation of Rebuilding Policies for U.S. Fisheries.

    Directory of Open Access Journals (Sweden)

    Ashleen Julia Benson

    Full Text Available 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.

  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. PMID:26761442

  18. 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.

  19. Characterization of artisanal fishery with camboa net at the Cassurubá Extractive Reserve, Bahia, Brazil

    Directory of Open Access Journals (Sweden)

    Matheus Oliveira Freitas

    2013-06-01

    Full Text Available Regarded as relevant nursery areas for fishes, the estuarine systems shelter many commercially important species. From October 2008 to November 2009, we investigated the ichthyofaunal composition and described the routine of artisanal fishing with camboa net in the estuary at the Cassurubá Extractive Reserve, Bahia, Brazil. Samplings were conducted in three rivers, during the new and full moons. A total of 1,074 fishes were caught in 17 fisheries with nets, belonging to 26 species and 17 families, with a total biomass of 378.4 kg. The Gerreidae and Centropomidae families were the most abundant ones, and there was a predominance of catches. Out of the total, 50% of individuals which were at the first gonadal maturation (L50 described in the literature had a size less than the expected one, indicating growth overfishing. We recommends the establishment of management systems shared between the actors involved in this fishing art and the Cassurubá Extractive Reserve managers, in order to reduce the capture of individuals below the first gonadal maturation size.

  20. The impact of predation by marine mammals on patagonian toothfish longline fisheries.

    Directory of Open Access Journals (Sweden)

    Marta Söffker

    Full Text Available Predatory interaction of marine mammals with longline fisheries is observed globally, leading to partial or complete loss of the catch and in some parts of the world to considerable financial loss. Depredation can also create additional unrecorded fishing mortality of a stock and has the potential to introduce bias to stock assessments. Here we aim to characterise depredation in the Patagonian toothfish (Dissostichus eleginoides fishery around South Georgia focusing on the spatio-temporal component of these interactions. Antarctic fur seals (Arctocephalus gazella, sperm whales (Physeter macrocephalus, and orcas (Orcinus orca frequently feed on fish hooked on longlines around South Georgia. A third of longlines encounter sperm whales, but loss of catch due to sperm whales is insignificant when compared to that due to orcas, which interact with only 5% of longlines but can take more than half of the catch in some cases. Orca depredation around South Georgia is spatially limited and focused in areas of putative migration routes, and the impact is compounded as a result of the fishery also concentrating in those areas at those times. Understanding the seasonal behaviour of orcas and the spatial and temporal distribution of "depredation hot spots" can reduce marine mammal interactions, will improve assessment and management of the stock and contribute to increased operational efficiency of the fishery. Such information is valuable in the effort to resolve the human-mammal conflict for resources.

  1. Trends in trawl and purse seine catch rates in the north-eastern Mediterranean

    Directory of Open Access Journals (Sweden)

    A. MACHIAS

    2012-12-01

    Full Text Available Data on fishing effort expressed in vessel days at sea and corresponding landing/day for a large number of species have been collected by the Institute of Marine Biological Resources (IMBR since the second half of 1995. Data were collected over a grid of 21 stations throughout the Greek seas. In the present study we analyzed the monthly days at sea as well as catch per day for trawlers and purse seiners from 1996 to 2000, by general linear models and trend analysis. The following vessel size groups per gear were considered: (a trawlers smaller and larger than 20m; (b purse-seiners smaller and larger than 15m. Collected data were also aggregated for five fishing sub-areas: the North Aegean, the Central Aegean, the South Aegean, Cretan waters and the Ionian Sea. Trend analysis of landing/day time series indicated that demersal and pelagic resources are declining in the main fishing grounds. Declining landing/day trends are regarded as indicators of overfishing, especially in the light of the fact that high catch rates are maintained by fishing in ‘hot spots’. The results of the present analysis provide, for the first time, important information on the sustainability of the fisheries in the north-eastern Mediterranean, an area characterized by a complete lack of accurate long-term data on effort and catch per effort

  2. Sardine fishery in Kenya

    OpenAIRE

    Wakwabi, E.

    1986-01-01

    This paper gives an overview on the Kenya sardine fishery as a research area for the future development and management of marine resources. The fishery is viewed in the context of an industry and the need for research into it as an ecological indicator and for commercial exploitation is emphasized.

  3. CPS Trawl Life History Haul Catch Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Weight in kilograms for all species (identified to lowest taxonomic criteria) caught during SWFSC-FRD fishery independent surveys (including DEPM, ATM, SaKe) of...

  4. Ecomorphology as a tool in fisheries: identification and ecotyping of Lake Tana barbs (Barbus intermedius complex), Ethiopia.

    NARCIS (Netherlands)

    Sibbing, F.A.; Nagelkerke, L.A.J.; Osse, J.W.M.

    1994-01-01

    Fisheries development of Lake Tana, Ethiopia, urgently requires the identification of its unknown units of fish stock. A diversity of large barbs (up to 80 cm SL), lumped into one species Barbus intermedius and contributing over 35% of the annual catch, consists of at least thirteen distinct morphot

  5. Influence of twin and multi-rig trawl systems on CPUE in the Danish Norway lobster (Nephrops norvegicus) fishery

    DEFF Research Database (Denmark)

    Feekings, Jordan P.; Berg, Casper Willestofte; Krag, Ludvig Ahm;

    2016-01-01

    One of the most effective ways to alter catch and length compositions in trawls is to adjust the meshsize or add selective devices such as sorting grids and selective netting panels. These changes are oftenintroduced into the fishery in a top down manner whereby fishermen are forced to comply with...

  6. 75 FR 76352 - Fisheries of the Exclusive Economic Zone Off Alaska; Gulf of Alaska; Proposed 2011 and 2012...

    Science.gov (United States)

    2010-12-08

    ... development of this data base will require the cooperation of several agencies including NMFS, the Alaska... and survey data. NMFS stock assessment scientists believe that unbiased commercial fishery catch-per... final rule to implement Amendment 87 to the FMP on October 6, 2010 (75 FR 61639), effective November...

  7. An analysis of the impacts of climatic variability and hydrology on the coastal fisheries, Engraulis encrasicolus and Sepia officinalis, of Portugal

    OpenAIRE

    Ullah, Hadayet; Leitao, F.; Baptista, Vânia; Chícharo, Luís

    2012-01-01

    The notion that climate change may impact coastal fish production suggests a need to understand how climatic variables may influence fish catches at different time scales. Evidence suggests that the effect of climatic variability and fishing effort on landed catches (as proxy of fish abundance) may vary at the regional scale. This study aims to assess the sensibility of two commercial species with a short life cycle (Engraulis encrasicolus and Sepia officinalis) to climatic and fisheries effe...

  8. Hundred and eighty years of fleet dynamics in the Belgian sea fisheries

    OpenAIRE

    Lescrauwaet, A.-K.; Fockedey, N.; Debergh, H.; Vincx, M.; Mees, J.

    2013-01-01

    Understanding the impact of fisheries on the commercial fish stocks requires detailed catch statistics and data on the dynamics of fleet and catch effort, at least before industrial fishing started. Most time-series on the fleet dynamics start after the 1980s, at times when major changes in fleet characteristics had already taken place. In the present paper, the results of the integration of data on fleet size (from 1830), tonnage (from 1842) and engine power (kW, from 1912) of the Belgian se...

  9. Sustainable Fisheries in Southeast Asia

    Directory of Open Access Journals (Sweden)

    Melda Kamil Ariadno

    2011-09-01

    Full Text Available Fisheries activity has increased significantly in number. As a result, we might see high investment in fisheries is due to the high demand for fish and fisheries products. Therefore, marine resources as well as other living resources are at risk in being harmed by excessive fisheries activities, for example: the use of trawl. Indonesia, as a Maritime State, need to impose sustainable fisheries because the principle of utilizing sustainable fisheries resources as adopted in the Law on Fisheries (Law No. 31 Year 2004 as amended by Law No. 45 Year 2009 to control fishery activities.Fishery activities are regulated not only by the Law on Fisheries but also international regulation adopted worldwide such as the Code of Conduct for Responsible Fisheries (CCRF. CCRF was prepared to include primary principles to elaborate the mechanism of fishery activities which is designated not to cost harmful damages in fisheries activities. CCRF is also accompanied by several technical guidelines that provide certain procedures to be applied to (1 fishing operations; (2 the precautionary approach as applied to capture fisheries and species introductions; (3 integrating fisheries into coastal area management; (4 fisheries management; (5 aquaculture development; and (6 inland fisheries. Consequently, CCRF is intended to cover any kind of fishery anywhere in the world not just marine capture fisheries, but also freshwater fisheries as well as aquaculture both marine and freshwater aquaculture. Excessive fishery activities would then not be harmful if Indonesia is willing to impose regulation which is significantly and effectively to manage these kind of fishery activities. Along with the fact that Indonesia is recognized as a Marine State, there is no reason to hold back in addressing this situation.

  10. The Path towards Endangered Species: Prehistoric Fisheries in Southeastern Brazil.

    Science.gov (United States)

    Lopes, Mariana Samôr; Bertucci, Thayse Cristina Pereira; Rapagnã, Luciano; Tubino, Rafael de Almeida; Monteiro-Neto, Cassiano; Tomas, Acácio Ribeiro Gomes; Tenório, Maria Cristina; Lima, Tânia; Souza, Rosa; Carrillo-Briceño, Jorge Domingo; Haimovici, Manuel; Macario, Kita; Carvalho, Carla; Aguilera Socorro, Orangel

    2016-01-01

    Brazilian shellmounds are archaeological sites with a high concentration of marine faunal remains. There are more than 2000 sites along the coast of Brazil that range in age from 8,720 to 985 cal BP. Here, we studied the ichthyoarchaeological remains (i.e., cranial/postcranial bones, otoliths, and teeth, among others) at 13 shellmounds on the southern coast of the state of Rio de Janeiro, which are located in coastal landscapes, including a sandy plain with coastal lagoons, rocky islands, islets and rocky bays. We identified patterns of similarity between shellmounds based on fish diversity, the ages of the assemblages, littoral geomorphology and prehistoric fisheries. Our new radiocarbon dating, based on otolith samples, was used for fishery characterization over time. A taxonomical study of the ichthyoarchaeological remains includes a diversity of 97 marine species, representing 37% of all modern species (i.e., 265 spp.) that have been documented along the coast of Rio de Janeiro state. This high fish diversity recovered from the shellmounds is clear evidence of well-developed prehistoric fishery activity that targeted sharks, rays and finfishes in a productive area influenced by coastal marine upwelling. The presence of adult and neonate shark, especially oceanic species, is here interpreted as evidence of prehistoric fisheries capacity for exploitation and possibly overexploitation in nursery areas. Various tools and strategies were used to capture finfish in seasonal fisheries, over rocky reef bottoms and in sandy littoral environments. Massive catches of whitemouth croaker, main target dermersal species of South Atlantic coast, show evidence of a reduction in body size of approximately 28% compared with modern fisheries. Fishery activity involving vulnerable species, especially in nursery areas, could mark the beginning of fish depletion along the southeastern Brazilian coast and the collapse of natural fish populations. PMID:27355355

  11. The Path towards Endangered Species: Prehistoric Fisheries in Southeastern Brazil.

    Directory of Open Access Journals (Sweden)

    Mariana Samôr Lopes

    Full Text Available Brazilian shellmounds are archaeological sites with a high concentration of marine faunal remains. There are more than 2000 sites along the coast of Brazil that range in age from 8,720 to 985 cal BP. Here, we studied the ichthyoarchaeological remains (i.e., cranial/postcranial bones, otoliths, and teeth, among others at 13 shellmounds on the southern coast of the state of Rio de Janeiro, which are located in coastal landscapes, including a sandy plain with coastal lagoons, rocky islands, islets and rocky bays. We identified patterns of similarity between shellmounds based on fish diversity, the ages of the assemblages, littoral geomorphology and prehistoric fisheries. Our new radiocarbon dating, based on otolith samples, was used for fishery characterization over time. A taxonomical study of the ichthyoarchaeological remains includes a diversity of 97 marine species, representing 37% of all modern species (i.e., 265 spp. that have been documented along the coast of Rio de Janeiro state. This high fish diversity recovered from the shellmounds is clear evidence of well-developed prehistoric fishery activity that targeted sharks, rays and finfishes in a productive area influenced by coastal marine upwelling. The presence of adult and neonate shark, especially oceanic species, is here interpreted as evidence of prehistoric fisheries capacity for exploitation and possibly overexploitation in nursery areas. Various tools and strategies were used to capture finfish in seasonal fisheries, over rocky reef bottoms and in sandy littoral environments. Massive catches of whitemouth croaker, main target dermersal species of South Atlantic coast, show evidence of a reduction in body size of approximately 28% compared with modern fisheries. Fishery activity involving vulnerable species, especially in nursery areas, could mark the beginning of fish depletion along the southeastern Brazilian coast and the collapse of natural fish populations.

  12. The Path towards Endangered Species: Prehistoric Fisheries in Southeastern Brazil.

    Science.gov (United States)

    Lopes, Mariana Samôr; Bertucci, Thayse Cristina Pereira; Rapagnã, Luciano; Tubino, Rafael de Almeida; Monteiro-Neto, Cassiano; Tomas, Acácio Ribeiro Gomes; Tenório, Maria Cristina; Lima, Tânia; Souza, Rosa; Carrillo-Briceño, Jorge Domingo; Haimovici, Manuel; Macario, Kita; Carvalho, Carla; Aguilera Socorro, Orangel

    2016-01-01

    Brazilian shellmounds are archaeological sites with a high concentration of marine faunal remains. There are more than 2000 sites along the coast of Brazil that range in age from 8,720 to 985 cal BP. Here, we studied the ichthyoarchaeological remains (i.e., cranial/postcranial bones, otoliths, and teeth, among others) at 13 shellmounds on the southern coast of the state of Rio de Janeiro, which are located in coastal landscapes, including a sandy plain with coastal lagoons, rocky islands, islets and rocky bays. We identified patterns of similarity between shellmounds based on fish diversity, the ages of the assemblages, littoral geomorphology and prehistoric fisheries. Our new radiocarbon dating, based on otolith samples, was used for fishery characterization over time. A taxonomical study of the ichthyoarchaeological remains includes a diversity of 97 marine species, representing 37% of all modern species (i.e., 265 spp.) that have been documented along the coast of Rio de Janeiro state. This high fish diversity recovered from the shellmounds is clear evidence of well-developed prehistoric fishery activity that targeted sharks, rays and finfishes in a productive area influenced by coastal marine upwelling. The presence of adult and neonate shark, especially oceanic species, is here interpreted as evidence of prehistoric fisheries capacity for exploitation and possibly overexploitation in nursery areas. Various tools and strategies were used to capture finfish in seasonal fisheries, over rocky reef bottoms and in sandy littoral environments. Massive catches of whitemouth croaker, main target dermersal species of South Atlantic coast, show evidence of a reduction in body size of approximately 28% compared with modern fisheries. Fishery activity involving vulnerable species, especially in nursery areas, could mark the beginning of fish depletion along the southeastern Brazilian coast and the collapse of natural fish populations.

  13. The Path towards Endangered Species: Prehistoric Fisheries in Southeastern Brazil

    Science.gov (United States)

    Lopes, Mariana Samôr; Bertucci, Thayse Cristina Pereira; Rapagnã, Luciano; Tubino, Rafael de Almeida; Monteiro-Neto, Cassiano; Tomas, Acácio Ribeiro Gomes; Tenório, Maria Cristina; Lima, Tânia; Souza, Rosa; Carrillo-Briceño, Jorge Domingo; Haimovici, Manuel; Macario, Kita; Carvalho, Carla; Aguilera Socorro, Orangel

    2016-01-01

    Brazilian shellmounds are archaeological sites with a high concentration of marine faunal remains. There are more than 2000 sites along the coast of Brazil that range in age from 8,720 to 985 cal BP. Here, we studied the ichthyoarchaeological remains (i.e., cranial/postcranial bones, otoliths, and teeth, among others) at 13 shellmounds on the southern coast of the state of Rio de Janeiro, which are located in coastal landscapes, including a sandy plain with coastal lagoons, rocky islands, islets and rocky bays. We identified patterns of similarity between shellmounds based on fish diversity, the ages of the assemblages, littoral geomorphology and prehistoric fisheries. Our new radiocarbon dating, based on otolith samples, was used for fishery characterization over time. A taxonomical study of the ichthyoarchaeological remains includes a diversity of 97 marine species, representing 37% of all modern species (i.e., 265 spp.) that have been documented along the coast of Rio de Janeiro state. This high fish diversity recovered from the shellmounds is clear evidence of well-developed prehistoric fishery activity that targeted sharks, rays and finfishes in a productive area influenced by coastal marine upwelling. The presence of adult and neonate shark, especially oceanic species, is here interpreted as evidence of prehistoric fisheries capacity for exploitation and possibly overexploitation in nursery areas. Various tools and strategies were used to capture finfish in seasonal fisheries, over rocky reef bottoms and in sandy littoral environments. Massive catches of whitemouth croaker, main target dermersal species of South Atlantic coast, show evidence of a reduction in body size of approximately 28% compared with modern fisheries. Fishery activity involving vulnerable species, especially in nursery areas, could mark the beginning of fish depletion along the southeastern Brazilian coast and the collapse of natural fish populations. PMID:27355355

  14. Liberal Arts Catch-Up Revisited

    Science.gov (United States)

    Goyder, John

    2014-01-01

    This paper replicates the work of Giles and Drewes from the 1990s. They showed a catch-up effect whereby graduates of liberal arts undergraduate programs, although at an early-career disadvantage compared with graduates of applied programs, had higher incomes by mid-career. Working with the Panel 5 Survey of Labour and Income Dynamics (2005-2010),…

  15. Hunting the Shadow, Catching the Light

    DEFF Research Database (Denmark)

    Toft, Anne Elisabeth; Nielsen, Torben

    2009-01-01

    From 28 October to 6 November 2009 twenty-one 3rd year students in interior design from Central Academy of Fine Arts (CAFA), School of Architecture, Beijing participated in the workshop Hunting the Shadow - Catching the Light. The workshop was conceived and led by the Danish architects Torben Nie...

  16. Catching up with the Future of Physics

    CERN Multimedia

    2008-01-01

    With most of the high-energy physics world on tenterhooks waiting for the startup of the Large Hadron Collider in Switzerland later this year, it's a good time to catch up (if you haven't already) on what all the excitement is about.

  17. Going Dutch : Catch-All Insider Trading

    NARCIS (Netherlands)

    Groenhuijsen, M.S.; Kristen, F.G.H.

    1999-01-01

    In the Netherlands new legislation has come into force in order to deal with insider trading. The legislator followed a new strategy. This time, instead of a provision with well-defined criteria, a sort of a catch all-provision was created. The aim was to avoid difficulties in proving the offence. A

  18. Consumer Information Sharing : Understanding Psychological Drivers of Social Transmission

    NARCIS (Netherlands)

    E. Akpinar (Ezgi)

    2013-01-01

    textabstractConsumers often share experiences, opinions or certain content with others. For example, they suggest restaurants, recommend article posts, share online videos, pass along rumors and complain about customer services. Such word of mouth determines what catches on and become popular among

  19. Employment Assimilation of Immigrants in the Netherlands: Catching Up and the Irrelevance of Education

    OpenAIRE

    Zorlu, Aslan; Hartog, Joop

    2008-01-01

    Using two Dutch labour force surveys, employment assimilation of immigrants is examined. We observe marked differences between immigrants by source country. Non-western immigrants never reach parity with native Dutch. Even second generation immigrants never fully catch up. Caribbean immigrants, who share a colonial history with the Dutch, assimilate relatively quick compared to other non-western immigrants but they still suffer from high unemployment. The study also documents that the quality...

  20. Migration and fisheries of North East Atlantic mackerel (Scomber scombrus) in autumn and winter

    DEFF Research Database (Denmark)

    Jansen, Teunis; Campbell, A.; Kelly, C.;

    2012-01-01

    It has been suggested that observed spatial variation in mackerel fisheries, extending over several hundreds of kilometers, is reflective of climate-driven changes in mackerel migration patterns. Previous studies have been unable to clearly demonstrate this link. In this paper we demonstrate corr...... to understand the migration through large parts of the life of adult mackerel and for the management of this major international fishery......It has been suggested that observed spatial variation in mackerel fisheries, extending over several hundreds of kilometers, is reflective of climate-driven changes in mackerel migration patterns. Previous studies have been unable to clearly demonstrate this link. In this paper we demonstrate...... correlation between temperature and mackerel migration/distribution as proxied by mackerel catch data from both scientific bottom trawl surveys and commercial fisheries. We show that mackerel aggregate and migrate distances of up to 500 km along the continental shelf edge from mid-November to early March...

  1. The Ecuadorian Artisanal Fishery for Large Pelagics: Species Composition and Spatio-Temporal Dynamics.

    Directory of Open Access Journals (Sweden)

    Jimmy Martínez-Ortiz

    Full Text Available The artisanal fisheries of Ecuador operate within one of the most dynamic and productive marine ecosystems of the world. This study investigates the catch composition of the Ecuadorian artisanal fishery for large pelagic fishes, including aspects of its spatio-temporal dynamics. The analyses of this study are based on the most extensive dataset available to date for this fishery: a total of 106,963 trip-landing inspection records collected at its five principal ports during 2008 ‒ 2012. Ecuadorian artisanal fisheries remove a substantial amount of biomass from the upper trophic-level predatory fish community of the eastern tropical Pacific Ocean. It is estimated that at least 135 thousand metric tons (mt (about 15.5 million fish were landed in the five principal ports during the study period. The great novelty of Ecuadorian artisanal fisheries is the "oceanic-artisanal" fleet component, which consists of mother-ship (nodriza boats with their towed fiber-glass skiffs (fibras operating with pelagic longlines. This fleet has fully expanded into oceanic waters as far offshore as 100°W, west of the Galapagos Archipelago. It is estimated that nodriza operations produce as much as 80% of the total catches of the artisanal fishery. The remainder is produced by independent fibras operating in inshore waters with pelagic longlines and/or surface gillnets. A multivariate regression tree analysis was used to investigate spatio-environmental effects on the nodriza fleet (n = 6,821 trips. The catch species composition of the nodriza fleet is strongly influenced by the northwesterly circulation of the Humboldt Current along the coast of Peru and its associated cold waters masses. The target species and longline gear-type used by nodrizas change seasonally with the incursion of cool waters (< 25°C from the south and offshore. During this season, dolphinfish (Coryphaena hippurus dominates the catches. However, in warmer waters, the fishery changes to tuna

  2. The Ecuadorian Artisanal Fishery for Large Pelagics: Species Composition and Spatio-Temporal Dynamics

    Science.gov (United States)

    Martínez-Ortiz, Jimmy; Aires-da-Silva, Alexandre M.; Lennert-Cody, Cleridy E.; Maunder, Mark N.

    2015-01-01

    The artisanal fisheries of Ecuador operate within one of the most dynamic and productive marine ecosystems of the world. This study investigates the catch composition of the Ecuadorian artisanal fishery for large pelagic fishes, including aspects of its spatio-temporal dynamics. The analyses of this study are based on the most extensive dataset available to date for this fishery: a total of 106,963 trip-landing inspection records collected at its five principal ports during 2008 ‒ 2012. Ecuadorian artisanal fisheries remove a substantial amount of biomass from the upper trophic-level predatory fish community of the eastern tropical Pacific Ocean. It is estimated that at least 135 thousand metric tons (mt) (about 15.5 million fish) were landed in the five principal ports during the study period. The great novelty of Ecuadorian artisanal fisheries is the “oceanic-artisanal” fleet component, which consists of mother-ship (nodriza) boats with their towed fiber-glass skiffs (fibras) operating with pelagic longlines. This fleet has fully expanded into oceanic waters as far offshore as 100°W, west of the Galapagos Archipelago. It is estimated that nodriza operations produce as much as 80% of the total catches of the artisanal fishery. The remainder is produced by independent fibras operating in inshore waters with pelagic longlines and/or surface gillnets. A multivariate regression tree analysis was used to investigate spatio-environmental effects on the nodriza fleet (n = 6,821 trips). The catch species composition of the nodriza fleet is strongly influenced by the northwesterly circulation of the Humboldt Current along the coast of Peru and its associated cold waters masses. The target species and longline gear-type used by nodrizas change seasonally with the incursion of cool waters (< 25°C) from the south and offshore. During this season, dolphinfish (Coryphaena hippurus) dominates the catches. However, in warmer waters, the fishery changes to tuna

  3. Identification and evaluation of shark bycatch in Georgia’s commercial shrimp trawl fishery with implications for management

    Science.gov (United States)

    Belcher, C.N.; Jennings, Cecil A.

    2011-01-01

    Many US states have recreational and commercial fisheries that occur in nursery areas occupied by subadult sharks and can potentially affect their survival. Georgia is one of few US states without a directed commercial shark fishery, but the state has a large, nearshore penaeid shrimp trawl fishery in which small sharks occur as bycatch. During our 1995-1998 investigation of bycatch in fishery-dependent sampling events, 34% of 127 trawls contained sharks. This bycatch totalled 217 individuals from six species, with Atlantic sharpnose shark, Rhizoprionodon terraenovae (Richardson), the most common and finetooth shark, Carcharhinus isodon (Müller & Henle) and spinner shark, Carcharhinus brevipinna (Müller & Henle), the least common. The highest catch rates for sharks occurred during June and July and coincided with the peak months of the pupping season for many species. Trawl tow speed and tow time did not significantly influence catch rates for shark species. Gear configurations [net type, turtle excluder device (TED), bycatch reduction device] affected catch rates for shark species. Results of this study indicate gear restrictions, a delayed season opening, or reduced bar spacing on TEDs may reduce shark bycatch in this fishery.

  4. Analyses on fishing ground and catch composition of large-scale light falling-net fisheries in South China Sea%南海区大型灯光罩网渔场渔期和渔获组成分析

    Institute of Scientific and Technical Information of China (English)

    张鹏; 曾晓光; 杨吝; 彭昌瀚; 张旭丰; 杨生; 谭永光; 杨炳忠; 晏磊

    2013-01-01

    根据2005年8月~2010年5月“琼文昌33180”渔船的生产监测记录,分析了南海区大型灯光罩网渔业的渔场渔期分布和主要渔获组成.结果显示,鸢乌贼(Sthenoteuthis oualaniensis)、鲹科(Carangidae)、带鱼(Trichiurus japonicus)、枪乌贼(Loligo)和舵鲣(Auxis)等为主要渔获种类,分别占总产量的40.94%、21.92%、13.56%、10.17%和6.21%;作业渔场可分为西、中沙邻近深水海域(Ⅰ区)、珠江口外大陆架海域(Ⅱ区)、北部湾大陆架海域(Ⅲ区)3个区域;Ⅰ区主捕鸢乌贼(91.10%),大型金枪鱼类也占0.83%的比例;Ⅱ区主捕鲹科(42.88%)、枪乌贼(20.34%)和带鱼(14.52%);Ⅲ区主捕带鱼(45.06%)、鲹科(22.16%)和枪乌贼(14.58%).3月~5月主要在Ⅰ区生产,8月~9月和12月~翌年2月主要在Ⅱ区生产,10月~11月主要在Ⅲ区生产.外海(Ⅰ区)作业天数的年度波动较大,建议调整罩网外海休渔制度.%Based on the monitoring data of “QIONG WEN CHANG NO · 33180” from August 2005 to May 2010,we analyzed the fishing grounds,fishing season and dominant species of large-scale light falling-net fisheries in South China Sea.Results show that the dominant species are Sthenoteuthis oualaniensis,Carangidae,Trichiurns japonicus,Loligo and Auxis,which account for 40.94%,21.92%,13.56%,10.17% and 6.21% of the total,respectively.We divide the fishing grounds into three areas:area Ⅰ,which is located in deep waters close to Xisha & Zhongsha Islands ; area Ⅱ,located in continental shelf waters outside Pearl River estuary ;and area Ⅲ,located in continental shelf waters in Beibu Gulf.Dominant species of area Ⅰ is S.oualaniensi,which account for 91.10% of total landings,and the second most species is large tunas (Thunnus albacares,T.obesus),making up 0.83%.Dominant species of area Ⅱ are Carangidae,Loligo and T.japonicus,which account for 42.88%,20.34% and 14.52%,respectively.Dominant species of

  5. Multispecies Fisheries in the Lower Amazon River and Its Relationship with the Regional and Global Climate Variability.

    Science.gov (United States)

    Pinaya, Walter Hugo Diaz; Lobon-Cervia, Francisco Javier; Pita, Pablo; Buss de Souza, Ronald; Freire, Juan; Isaac, Victoria Judith

    2016-01-01

    This paper aims to describe the spatial-temporal variability in catch of the main fishery resources of the Amazon River and floodplain lakes of the Lower Amazon, as well as relating the Catch per Unit of Effort with anomalies of some of the Amazon River, atmosphere and Atlantic Ocean system variables, determining the influence of the environment on the Amazonian fishery resources. Finfish landings data from the towns and villages of the Lower Amazon for the fisheries of three sites (Óbidos, Santarém and Monte Alegre), were obtained for the period between January 1993 and December 2004. Analysis of variance, detrended correspondence analysis, redundancy analysis and multiple regression techniques were used for the statistical analysis of the distinct time series. Fisheries production in the Lower Amazon presents differences between the Amazon River and the floodplain lakes. Production in the Amazon River is approximately half of the one of the floodplain lakes. This variability occurs both along the Lower Amazon River region (longitudinal gradient) and laterally (latitudinal gradient) for every fishing ground studied here. The distinct environmental variables alone or in association act differently on the fishery stocks and the success of catches in each fishery group studied here. Important variables are the flooding events; the soil the sea surface temperatures; the humidity; the wind and the occurence of El Niño-Southern Oscillation events. Fishery productivity presents a large difference in quantity and distribution patterns between the river and floodplain lakes. This variability occurs in the region of the Lower Amazon as well as laterally for each fishery group studied, being dependent on the ecological characteristics and life strategies of each fish group considered here. PMID:27314951

  6. Multispecies Fisheries in the Lower Amazon River and Its Relationship with the Regional and Global Climate Variability.

    Directory of Open Access Journals (Sweden)

    Walter Hugo Diaz Pinaya

    Full Text Available This paper aims to describe the spatial-temporal variability in catch of the main fishery resources of the Amazon River and floodplain lakes of the Lower Amazon, as well as relating the Catch per Unit of Effort with anomalies of some of the Amazon River, atmosphere and Atlantic Ocean system variables, determining the influence of the environment on the Amazonian fishery resources. Finfish landings data from the towns and villages of the Lower Amazon for the fisheries of three sites (Óbidos, Santarém and Monte Alegre, were obtained for the period between January 1993 and December 2004. Analysis of variance, detrended correspondence analysis, redundancy analysis and multiple regression techniques were used for the statistical analysis of the distinct time series. Fisheries production in the Lower Amazon presents differences between the Amazon River and the floodplain lakes. Production in the Amazon River is approximately half of the one of the floodplain lakes. This variability occurs both along the Lower Amazon River region (longitudinal gradient and laterally (latitudinal gradient for every fishing ground studied here. The distinct environmental variables alone or in association act differently on the fishery stocks and the success of catches in each fishery group studied here. Important variables are the flooding events; the soil the sea surface temperatures; the humidity; the wind and the occurence of El Niño-Southern Oscillation events. Fishery productivity presents a large difference in quantity and distribution patterns between the river and floodplain lakes. This variability occurs in the region of the Lower Amazon as well as laterally for each fishery group studied, being dependent on the ecological characteristics and life strategies of each fish group considered here.

  7. Multispecies Fisheries in the Lower Amazon River and Its Relationship with the Regional and Global Climate Variability.

    Science.gov (United States)

    Pinaya, Walter Hugo Diaz; Lobon-Cervia, Francisco Javier; Pita, Pablo; Buss de Souza, Ronald; Freire, Juan; Isaac, Victoria Judith

    2016-01-01

    This paper aims to describe the spatial-temporal variability in catch of the main fishery resources of the Amazon River and floodplain lakes of the Lower Amazon, as well as relating the Catch per Unit of Effort with anomalies of some of the Amazon River, atmosphere and Atlantic Ocean system variables, determining the influence of the environment on the Amazonian fishery resources. Finfish landings data from the towns and villages of the Lower Amazon for the fisheries of three sites (Óbidos, Santarém and Monte Alegre), were obtained for the period between January 1993 and December 2004. Analysis of variance, detrended correspondence analysis, redundancy analysis and multiple regression techniques were used for the statistical analysis of the distinct time series. Fisheries production in the Lower Amazon presents differences between the Amazon River and the floodplain lakes. Production in the Amazon River is approximately half of the one of the floodplain lakes. This variability occurs both along the Lower Amazon River region (longitudinal gradient) and laterally (latitudinal gradient) for every fishing ground studied here. The distinct environmental variables alone or in association act differently on the fishery stocks and the success of catches in each fishery group studied here. Important variables are the flooding events; the soil the sea surface temperatures; the humidity; the wind and the occurence of El Niño-Southern Oscillation events. Fishery productivity presents a large difference in quantity and distribution patterns between the river and floodplain lakes. This variability occurs in the region of the Lower Amazon as well as laterally for each fishery group studied, being dependent on the ecological characteristics and life strategies of each fish group considered here.

  8. Multispecies Fisheries in the Lower Amazon River and Its Relationship with the Regional and Global Climate Variability

    Science.gov (United States)

    Buss de Souza, Ronald; Freire, Juan; Isaac, Victoria Judith

    2016-01-01

    This paper aims to describe the spatial-temporal variability in catch of the main fishery resources of the Amazon River and floodplain lakes of the Lower Amazon, as well as relating the Catch per Unit of Effort with anomalies of some of the Amazon River, atmosphere and Atlantic Ocean system variables, determining the influence of the environment on the Amazonian fishery resources. Finfish landings data from the towns and villages of the Lower Amazon for the fisheries of three sites (Óbidos, Santarém and Monte Alegre), were obtained for the period between January 1993 and December 2004. Analysis of variance, detrended correspondence analysis, redundancy analysis and multiple regression techniques were used for the statistical analysis of the distinct time series. Fisheries production in the Lower Amazon presents differences between the Amazon River and the floodplain lakes. Production in the Amazon River is approximately half of the one of the floodplain lakes. This variability occurs both along the Lower Amazon River region (longitudinal gradient) and laterally (latitudinal gradient) for every fishing ground studied here. The distinct environmental variables alone or in association act differently on the fishery stocks and the success of catches in each fishery group studied here. Important variables are the flooding events; the soil the sea surface temperatures; the humidity; the wind and the occurence of El Niño-Southern Oscillation events. Fishery productivity presents a large difference in quantity and distribution patterns between the river and floodplain lakes. This variability occurs in the region of the Lower Amazon as well as laterally for each fishery group studied, being dependent on the ecological characteristics and life strategies of each fish group considered here. PMID:27314951

  9. The Donegal Mackerel Fishery

    OpenAIRE

    Molloy, J; Kennedy, T. D.

    1980-01-01

    Irish Mackerel landings have increased dramatically, from less than 2,000 tonnes in 1970 to nearly 30,000 tonnes in 1978. The development of this fishery can be ensured only if a satisfactory management plan is drawn up. To provide the basis for such a plan a major investigation of the Donegal stocks was launched by the Department of Fisheries in 1978 and will continue for some years. At the same time the fishery scientists of other countries are studying other parts of the same mackerel stoc...

  10. Development of international fisheries for the eastern Baltic cod ( Gadus morhua ) from the late 1880s until 1938

    DEFF Research Database (Denmark)

    Eero, Margit; MacKenzie, Brian; Karlsdottir, H.M.;

    2007-01-01

    The paper provides an overview of eastern Baltic cod (Gadus morhua) fisheries from the end of the 1880s until 1938, in order to improve the knowledge of long-term stock dynamics. The data compiled and included in the study comprise catches and economic values of exploited fish species, time series...... of indicators of fishing effort and qualitative information on developments in fishing technology. This information has been assembled for different countries and locations in the Baltic Sea. We first summarize the multi-decadal development of national cod fisheries and their relative importance during...... of the variations in the catches of different countries (e.g. decline in the late 1920s; increase in the late 1930s) were caused by factors other than fishery developments. These factors probably include ecosystem-induced variations in cod population dynamics and need further investigation. (c) 2007 Elsevier B...

  11. Mathematics and fisheries: Match or mismatch?

    Directory of Open Access Journals (Sweden)

    Jon T. Schnute

    2005-04-01

    Full Text Available Mathematics plays a major role in contemporary fisheries management. Stock assessments often depend on elaborate models used to set catch levels and address other policy objectives. In recent years, the collapse of various important fish stocks has caused some critics to suggest that mathematical models actually obscure the truth by narrowing scientific understanding to the realm of quantifiable events. In the words of one fisherman, ``Mathematics has highjacked the definition and position of real science.'' In this paper, I present a number of typical fishery models, examine their limitations, discuss controversies about their use, and explore possible alternatives. I draw on examples from economics and investment theory to illustrate the problem of making credible predictions about an uncertain future. The constraints of the real world, where people care deeply about policy consequences, have altered my scientific perspective as an applied mathematician. This paper reflects the evolution of thought that has accompanied my experience working for 28 years at the Pacific Biological Station in Nanaimo, B.C., the host city for this conference.

  12. Potential impacts of climate change on the distribution of longline catches of yellowfin tuna (Thunnus albacares) in the Tasman sea

    Science.gov (United States)

    Dell, James T.; Wilcox, Chris; Matear, Richard J.; Chamberlain, Matthew A.; Hobday, Alistair J.

    2015-03-01

    The spatial distribution of living marine resources in the Tasman Sea is expected to shift due to the impacts of global climate change. Understanding the most likely future locations of valuable pelagic species will inform the sustainable harvest and management of species such as yellowfin tuna (YFT; Thunnus albacares). We estimate future upper ocean structure in the Tasman Sea, using both historical data and dynamically downscaled ocean projections for the 2060s, and apply a catch distribution model to estimate possible changes to the YFT catch in the eastern Australia domestic longline fishery. Both approaches project that locations with concentrated YFT catch in the Tasman Sea will shift poleward in response to likely climate change. By the 2060s, the core fishing areas are projected to have shifted both poleward and offshore of existing high catch areas. Shifts in the distribution and hence availability of this species may require future domestic fishing vessels to modify their fishing behaviors, which in turn may require social and economic adjustments.

  13. Effect of block net use and time of sampling on backpack electrofishing catches in three Kansas reservoirs

    Science.gov (United States)

    Schoenebeck, C.W.; Strakosh, T.R.; Guy, C.S.

    2005-01-01

    Using backpack electrofishing in three Kansas reservoirs, we investigated the need for block nets when estimating density (fish/ha) and species diversity and determined whether time of sampling affected catch rates (fish/h) of age-0 largemouth bass Micropterus salmoides and age-0 Lepomis spp. and species diversity. Block nets were used to enclose or buoys were used to mark the boundaries of 149 m2 of reservoir surface area. Species richness, diversity, and density of age-0 largemouth bass and Lepomis spp. did not differ significantly between areas enclosed with block nets and areas marked with buoys, but species richness, diversity, and catch rates differed significantly between day and night sampling. Age-0 largemouth bass and Lepomis spp. catch rates, species richness, and species diversity were all significantly higher during night sampling. Our results indicate that use of block nets may not be necessary to estimate age-0 largemouth bass and Lepomis spp. densities, species richness, or diversity in reservoir littoral areas. We recommend night sampling because of significantly higher catch rates and better representation of the littoral fish assemblage. ?? Copyright by the American Fisheries Society 2005.

  14. Analyzing fish stocks dynamics using CPUE and PRCF:a new approach for the fishery management

    Institute of Scientific and Technical Information of China (English)

    G Vzquez-Prada

    2014-01-01

    Catch per unit effort has been used in many fisheries researches worldwide like an abundance or density index. Parallel to this issue, partial ratio correlation function is a technique used to identify the density dependent structure underlying ecological time series. Although partial ratio correlation function is widely used in ecological fields, it has not been much used in fisheries and aquatic sciences. In this synthesis, a new combination of statistical techniques is proposed to diagnose the order of the population dynamic of fish stocks, as the first knowledge of the type of factors that may be regulating them, included human predation as an exogenous factor.

  15. Morocco - Artisanal Fisheries

    Data.gov (United States)

    Millenium 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...

  16. 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...

  17. Fisheries 2016 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...

  18. Green growth in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max; Ravensbeck, Lars; Nielsen, Rasmus

    2014-01-01

    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......, investing in the rebuilding of fish stocks and a coordinated regulation of marine activities that interact with fisheries. Incentive-based regulation of fisheries that counterbalances services of the ecosystems is an important instrument to achieve green growth....

  19. 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...

  20. A baseline survey of water quality, invertebrates, fisheries and socioeconomics on Lake Edward for proposed seismic surveys in block 4B : Final report

    OpenAIRE

    2008-01-01

    The National Fisheries Resources Research Institute (NaFIRRI) on behalf of OPEP Consult Ltd undertook a baseline survey of the transition zone (basically along the shoreline) and near shore habitats of the Uganda apart of Lake Edward and Kazinga channel during December 2007 to January 2008. A major objective of the baseline survey was to generate baseline information on the aquatic ecosystem features related to the fisheries and socio-economics of the fish catch including issues raised by res...

  1. Catch bond mechanism in Dynein motor driven collective transport

    CERN Document Server

    Nair, Anil; Mitra, Mithun K; Muhuri, Sudipto; Chaudhuri, Abhishek

    2016-01-01

    Recent experiments have demonstrated that dynein motor exhibits catch bonding behaviour, in which the unbinding rate of a single dynein decreases with increasing force, for a certain range of force. Motivated by these experiments, we propose a model for catch bonding in dynein using a threshold force bond deformation (TFBD) model wherein catch bonding sets in beyond a critical applied load force. We study the effect of catch bonding on unidirectional transport properties of cellular cargo carried by multiple dynein motors within the framework of this model. We find catch bonding can result in dramatic changes in the transport properties, which are in sharp contrast to kinesin driven unidirectional transport, where catch bonding is absent. We predict that, under certain conditions, the average velocity of the cellular cargo can actually increase as applied load is increased. We characterize the transport properties in terms of a velocity profile phase plot in the parameter space of the catch bond strength and ...

  2. Catch and size selectivity of small-scale fishing gear for the smooth-hound shark Mustelus mustelus (Linnaeus, 1758 (Chondrichthyes: Triakidae from the Aegean Turkish coast

    Directory of Open Access Journals (Sweden)

    T. CEYHAN

    2012-12-01

    Full Text Available Catch rate, CPUE, biomass ratios and size selectivity from traditional longline and trammel nets of Turkish coastal small-scale fisheries were investigated in order to describe the Smooth-hound shark (Mustelus mustelus fishery. The SELECT method was used to estimate the selectivity parameters of a variety of models for the trammel nets inner panel of 150 and 170 mm mesh sizes. Catch composition and proportion of the species were significantly different in longline and trammel nets. While mean CPUE of longline was 119.2±14.3 kg/1000 hooks, these values for 150 and 170 mm trammel nets were 5.3±1.2 kg/1000 m of net and 12.7±3.9 kg/1000 m of net, respectively. Biomass ratios of the by catch to Smooth-hound catch were found to be 1:0.32 for 150 mm trammel net, 1:0.65 for longline and 1:0.73 for 170 mm trammel net. The estimated modal lengths and spreads were found to be 91.1 and 16.2 cm for 150 mm and 103.2 and 18.4 cm for 170 mm, respectively. The modal lengths of the species as well as the spread values increased with mesh size.

  3. 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...

  4. Vision Algorithms Catch Defects in Screen Displays

    Science.gov (United States)

    2014-01-01

    Andrew Watson, a senior scientist at Ames Research Center, developed a tool called the Spatial Standard Observer (SSO), which models human vision for use in robotic applications. Redmond, Washington-based Radiant Zemax LLC licensed the technology from NASA and combined it with its imaging colorimeter system, creating a powerful tool that high-volume manufacturers of flat-panel displays use to catch defects in screens.

  5. 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

  6. 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.

  7. Towards an ecosystem approach to small island fisheries: A preliminary study of a balanced fishery in Kotania Bay (Seram Island, Indonesia

    Directory of Open Access Journals (Sweden)

    B.G. Hutubessy

    2014-12-01

    Full Text Available The Ecosystem Approach to Fisheries (EAF is a holistic one as EAF considers all species as important elements within the eco-system. An EAF requires that community and ecosystem structure should be maintained by harvesting fish communities in proportion to their natural productivity, thereby sustaining the balance of species and sizes in a community. This article draws from research on the reef fish community and catch in Kotania Bay on Seram Island in Maluku, Indonesia, an area of approximately 6000 ha. Based on the trophic guild (ie the aggregation of species utilizing similar food resources on the reef, the biomass of predator fish currently being captured now represents 40.4% of the total catch biomass. Members of the grouper family, the humphead wrasse (Cheilinus undulatus and trevally (Caranx melampygus in particular, have become targeted for sale in fish markets. If these predators are selectively targeted and exploited, the overall reef fishery and the human populations that depend on it may become imperilled, given these species’ significant roles in controlling those lower in the food chain. This study thereby emphasizes the need for balanced fisheries informed by the EAF model in small island fisheries management in order to sustain food security in such regions.

  8. Crawling to collapse: ecologically unsound ornamental invertebrate fisheries.

    Directory of Open Access Journals (Sweden)

    Andrew Rhyne

    Full Text Available BACKGROUND: Fishery management has historically been an inexact and reactionary discipline, often taking action only after a critical stock suffers overfishing or collapse. The invertebrate ornamental fishery in the State of Florida, with increasing catches over a more diverse array of species, is poised for collapse. Current management is static and the lack of an adaptive strategy will not allow for adequate responses associated with managing this multi-species fishery. The last decade has seen aquarium hobbyists shift their display preference from fish-only tanks to miniature reef ecosystems that include many invertebrate species, creating increased demand without proper oversight. The once small ornamental fishery has become an invertebrate-dominated major industry supplying five continents. METHODOLOGY/PRINCIPAL FINDINGS: Here, we analyzed the Florida Marine Life Fishery (FLML landing data from 1994 to 2007 for all invertebrate species. The data were organized to reflect both ecosystem purpose (in the wild and ecosystem services (commodities for each reported species to address the following question: Are ornamental invertebrates being exploited for their fundamental ecosystem services and economic value at the expense of reef resilience? We found that 9 million individuals were collected in 2007, 6 million of which were grazers. CONCLUSIONS/SIGNIFICANCE: The number of grazers now exceeds, by two-fold, the number of specimens collected for curio and ornamental purposes altogether, representing a major categorical shift. In general, landings have increased 10-fold since 1994, though the number of licenses has been dramatically reduced. Thus, despite current management strategies, the FLML Fishery appears to be crawling to collapse.

  9. A dynamic predator - prey model for fishery resources: a case of Lake Kasumigaura

    OpenAIRE

    Y Kitabatake

    1982-01-01

    A dynamic model for fishery resources with predator - prey relationships is constructed based on observational data and research findings for Lake Kasumigaura, Japan. The analysis of the stationary state as well as the sensitivity analysis shows that the use of diesel-powered trawling, which enables the large-scale catch of prey species in comparison with the traditional method of sailing trawling, may lead to the extinction of predator as well as prey species once the trawling efficiency in ...

  10. Sharing Economy

    DEFF Research Database (Denmark)

    Marton, Attila; Constantiou, Ioanna; Thoma, Antonela

    De spite the hype the notion of the sharing economy is surrounded by, our understanding of sharing is surprisingly undertheorized. In this paper, we make a first step towards rem edying this state of affairs by analy sing sharing as a s ocial practice. Based on a multi ple - case study, we analys...

  11. Shared pledge shared vision

    International Nuclear Information System (INIS)

    The New Partnership for Africa's Development (NEPAD) is a pledge by African leaders to eradicate poverty and to promote sustainable growth and development. NEPAD is a 'new framework of interaction with the rest of the world, including the industrialised countries and multilateral organizations.' The agenda is based on regional priorities and development plans and its implementation relies on African ownership and management. As a UN system organisation, the IAEA strongly supports the priorities identified in the Millennium Declaration and the New Partnership for Africa's Development. As a technical agency, the IAEA shares its recognized core competencies and technical expertise in support of NEPAD goals. Efforts aim at strengthening institutional capacity building in nuclear sciences and technology and promoting the sustainable application of nuclear techniques for social and economic development. The IAEA has a membership of 34 African countries. The Agency supports them under its technical cooperation programme through provision of expertise, training opportunities and equipment in priority areas identified by the countries themselves. For many African Member States, meeting basic human needs through the implementation of poverty alleviation strategies remains the top priority on the agenda for national development plans and international cooperation programmes. In the context of sustainable development, special attention is being paid to enlarging the contribution of isotopes and nuclear techniques in major areas of economic and social significance and to promoting regional cooperation in nuclear science and technology related fields. As a partner in development, the Agency has promoted and undertaken programmes to support African countries' efforts to address priority development issues particularly in the areas of health care, food and agriculture and water resources development. The IAEA technical cooperation mechanism includes support to the African Regional

  12. Self-reporting bias in Chinook salmon sport fisheries in Idaho: implications for roving creel surveys

    Science.gov (United States)

    McCormick, Joshua L.; Quist, Michael C.; Schill, Daniel J.

    2013-01-01

    Self-reporting bias in sport fisheries of Chinook Salmon Oncorhynchus tshawytscha in Idaho was quantified by comparing observed and angler-reported data. A total of 164 observed anglers fished for 541 h and caught 74 Chinook Salmon. Fifty-eight fish were harvested and 16 were released. Anglers reported fishing for 604 h, an overestimate of 63 h. Anglers reported catching 66 fish; four less harvested and four less released fish were reported than observed. A Monte Carlo simulation revealed that when angler-reported data were used, total catch was underestimated by 14–15 fish (19–20%) using the ratio-of-means estimator to calculate mean catch rate. Negative bias was reduced to six fish (8%) when the means-of-ratio estimator was used. Multiple linear regression models to predict reporting bias in time fished had poor predictive value. However, actual time fished and a categorical covariate indicating whether the angler fished continuously during their fishing trip were two variables that were present in all of the top a priori models evaluated. Underreporting of catch and overreporting of time fished by anglers present challenges when managing Chinook Salmon sport fisheries. However, confidence intervals were near target levels and using more liberal definitions of angling when estimating effort in creel surveys may decrease sensitivity to bias in angler-reported data.

  13. 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. PMID:26666127

  14. From food to feed: Assessment of the stationary lift net fishery of East Hainan, Northern South China Sea

    Science.gov (United States)

    Krumme, Uwe; Wang, Tian C.; Wang, Dao R.

    2013-04-01

    In the Asia-Pacific region, the increasing demand for low value/trash fish as feed for mariculture drives unsustainable fisheries on already overexploited marine resources. The mariculture demand may also affect artisanal nearshore fisheries operating in shallow nursery grounds, e.g., lift net fisheries, but little is known about how they work. We describe the stationary lift net artisanal fishery on the East coast of Hainan Island (northern South China Sea). A trapezoidal blanket net (mean surface area: 478 m2), stretched between four upright poles at the corners, is lowered and lifted via a rope system from a tower by a single fisher. In 2009 ˜200 households depended on 288 lift nets, 82% of which were located in the Wenchang/Wenjiao estuary. The number of lift nets decreased by 15% from 2007 to 2009. Presently, it is mainly an early retirement activity of fishers with a median age of 52 years and younger men rarely enter the fishery due to low catch rates. However, not one fisher would stop fishing even at 50% hypothetical decline in catch — due to lack of alternatives. Mean catch weight per fishing day is 12 kg (range: 0-1.7 t). In the past, the entire catch was used as food. Presently, an average of 52% of the catch is sold as feed to local pond and floating net cage mariculturists who, subsequently, supply the live food trade to markets as far as Hong Kong. Larger dead fishes are sold at village markets or at Qinglan harbor and are locally or regionally consumed. The density of lift-net operation is highest around the Wenchang/Wenjiao lagoon due to the presence of an extensive sheltered, shallow subtidal area in proximity to mariculture and export markets in Qinglan. Thus, the modern mariculture demand for low value/trash fish supports the continuation of an ancient artisanal fishery despite severe resource depletion. The existence of similar lift nets in Vietnam points to an exchange in the artisanal fishing knowledge between Vietnam and Hainan

  15. 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.

  16. Complexities and uncertainties in transitioning small-scale coral reef fisheries

    Directory of Open Access Journals (Sweden)

    Pierre eLeenhardt

    2016-05-01

    Full Text Available Coral reef fisheries support the development of local and national economies and are the basis of important cultural practices and worldviews. Transitioning economies, human development and environmental stress can harm this livelihood. Here we focus on a transitioning social-ecological system as case study (Moorea, French Polynesia. We review fishing practices and three decades of effort and landing estimates with the broader goal of informing management. Fishery activities in Moorea are quite challenging to quantify because of the diversity of gears used, the lack of centralized access points or markets, the high participation rates of the population in the fishery, and the overlapping cultural and economic motivations to catch fish. Compounding this challenging diversity, we lack a basic understanding of the complex interplay between the cultural, subsistence, and commercial use of Moorea's reefs. In Moorea, we found an order of magnitude gap between estimates of fishery yield produced by catch monitoring methods (~2 t km-2 year-1 and estimates produced using consumption or participatory socioeconomic consumer surveys (~24 t km-2 year-1. Several lines of evidence suggest reef resources may be overexploited and stakeholders have a diversity of opinions as to whether trends in the stocks are a cause for concern. The reefs, however, remain ecologically resilient. The relative health of the reef is striking given the socio-economic context. Moorea has a relatively high population density, a modern economic system linked into global flows of trade and travel, and the fishery has little remaining traditional or customary management. Other islands in the Pacific that continue to develop economically may have small-scale fisheries that increasingly resemble Moorea. Therefore, understanding Moorea's reef fisheries may provide insight into their future.

  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. 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,...

  19. 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...

  20. A portable trap with electric lead catches up to 75% of an invasive fish species.

    Science.gov (United States)

    Johnson, Nicholas S; Miehls, Scott; O'Connor, Lisa M; Bravener, Gale; Barber, Jessica; Thompson, Henry; Tix, John A; Bruning, Tyler

    2016-01-01

    A novel system combining a trap and pulsed direct current electricity was able to catch up to 75% of tagged invasive sea lamprey Petromyzon marinus in free-flowing streams. Non-target mortality was rare and impacts to non-target migration were minimal; likely because pulsed direct current only needed to be activated at night (7 hours of each day). The system was completely portable and the annual cost of the trapping system was low ($4,800 U.S. dollars). Use of the technology is poised to substantially advance integrated control of sea lamprey, which threaten a fishery valued at 7 billion U.S. dollars annually, and help restore sea lamprey populations in Europe where they are native, but imperiled. The system may be broadly applicable to controlling invasive fishes and restoring valued fishes worldwide, thus having far reaching effects on ecosystems and societies. PMID:27341485

  1. A portable trap with electric lead catches up to 75% of an invasive fish species

    Science.gov (United States)

    Johnson, Nicholas S.; Miehls, Scott; O’Connor, Lisa M.; Bravener, Gale; Barber, Jessica; Thompson, Henry; Tix, John A.; Bruning, Tyler

    2016-06-01

    A novel system combining a trap and pulsed direct current electricity was able to catch up to 75% of tagged invasive sea lamprey Petromyzon marinus in free-flowing streams. Non-target mortality was rare and impacts to non-target migration were minimal; likely because pulsed direct current only needed to be activated at night (7 hours of each day). The system was completely portable and the annual cost of the trapping system was low ($4,800 U.S. dollars). Use of the technology is poised to substantially advance integrated control of sea lamprey, which threaten a fishery valued at 7 billion U.S. dollars annually, and help restore sea lamprey populations in Europe where they are native, but imperiled. The system may be broadly applicable to controlling invasive fishes and restoring valued fishes worldwide, thus having far reaching effects on ecosystems and societies.

  2. A portable trap with electric lead catches up to 75% of an invasive fish species

    Science.gov (United States)

    Johnson, Nicholas S.; Miehls, Scott; O’Connor, Lisa M.; Bravener, Gale; Barber, Jessica; Thompson, Henry; Tix, John A.; Bruning, Tyler

    2016-01-01

    A novel system combining a trap and pulsed direct current electricity was able to catch up to 75% of tagged invasive sea lamprey Petromyzon marinus in free-flowing streams. Non-target mortality was rare and impacts to non-target migration were minimal; likely because pulsed direct current only needed to be activated at night (7 hours of each day). The system was completely portable and the annual cost of the trapping system was low ($4,800 U.S. dollars). Use of the technology is poised to substantially advance integrated control of sea lamprey, which threaten a fishery valued at 7 billion U.S. dollars annually, and help restore sea lamprey populations in Europe where they are native, but imperiled. The system may be broadly applicable to controlling invasive fishes and restoring valued fishes worldwide, thus having far reaching effects on ecosystems and societies. PMID:27341485

  3. A portable trap with electric lead catches up to 75% of an invasive fish species

    Science.gov (United States)

    Johnson, Nicholas; Miehls, Scott M.; O'Connor, Lisa M; Bravener, Gale; Barber, Jessica; Thompson, Henry T.; Tix, John A.; Bruning, Tyler

    2016-01-01

    A novel system combining a trap and pulsed direct current electricity was able to catch up to 75% of tagged invasive sea lamprey Petromyzon marinus in free-flowing streams. Non-target mortality was rare and impacts to non-target migration were minimal; likely because pulsed direct current only needed to be activated at night (7 hours of each day). The system was completely portable and the annual cost of the trapping system was low ($4,800 U.S. dollars). Use of the technology is poised to substantially advance integrated control of sea lamprey, which threaten a fishery valued at 7 billion U.S. dollars annually, and help restore sea lamprey populations in Europe where they are native, but imperiled. The system may be broadly applicable to controlling invasive fishes and restoring valued fishes worldwide, thus having far reaching effects on ecosystems and societies.

  4. 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...

  5. Share Contract Choices and Economic Performance

    DEFF Research Database (Denmark)

    Salazar Espinoza, César Antonio

    2015-01-01

    Typically, crew members in fisheries are remunerated through a share of the total revenues. However, there is little empirical evidence on the mechanisms by which revenues are distributed to labor and capital, and how these distributions affect economic performance. Under an agency problem...

  6. Samuel Wilmot, fish culture, and recreational fisheries in late 19th century Ontario.

    Science.gov (United States)

    Knight, William

    2007-01-01

    Historians have shown that fish culturists and anglers enjoyed a mutually beneficial relationship in 19th century North America. Sharing interests in producing and protecting fish for recreation, the two groups supported emerging regimes of fisheries administration and fish culture that privileged angling and game fish species. In Ontario, it has been argued that anglers achieved control of inland fisheries with help from state fish culturist Samuel Wilmot who, as a sportsman, shared anglers' recreational perspective. A closer look at Wilmot and fish culture in late 19th century Ontario, however, reveals a more complex struggle over recreational fisheries administration. I show that game fish culture under Wilmot was subordinated to fish culture programs that supported the Great Lakes commercial fisheries. Indeed, Wilmot resisted anglers' reframing of Ontario's fisheries as a private recreational resource. By the 1890s, however, this position was unpopular with Ontario's anglers and government officials, who demanded greater provincial control over recreational fisheries and fish culture. It was only after Wilmot's retirement in 1895 that game fish culture received higher priority in Ontario with both federal and provincial governments engaging in programs of wild bass transfers. In 1899, Ontario won a share of fisheries jurisdiction and established its first provincial fisheries administration, which laid the basis for more comprehensive programs of game fish culture in the 20th century. PMID:19227681

  7. Catch tanks inhibitor addition 200-East and 200-West Areas

    International Nuclear Information System (INIS)

    Reported is the study of 11 catch tanks in the 200-East Area and the 7 catch tanks in the 200-West Area listed as active. The location, capacity, material of construction, annual total accumulation, annual rain intrusion, waste transfer rate, and access for chemical injection in these tanks are documented. The present and future utilization and isolation plans for the catch tanks are established

  8. Catching up from early nutritional deficits? : evidence from rural Ethiopia

    OpenAIRE

    Outes-Leon, Ingo; Porter, Catherine

    2013-01-01

    We examine the nutritional status of a cohort of poor Ethiopian children and their patterns of catch-up growth in height-for-age between three key development stages: age one, five and eight. We use ordinary least squares (within community) and instrumental variables analysis. During the earliest period, we find that nutritional catch-up patterns vary substantially across socioeconomic groups: average catch-up growth in height-for-age is almost perfect among children in relatively better-off ...

  9. 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

    2013-03-01

    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.

  10. What is Fisheries Science?

    OpenAIRE

    Institute, Marine

    2006-01-01

    Fisheries science is a branch of marine science that deals with studies on the life history and state of fish stocks. The term ‘life history’ refers to the general biology of a fish stock (e.g. when/where do the fish spawn? How fast do they grow?). The term ‘state of a fish stock’ refers to the number and weight of fish in the stock (i.e. current stock biomass in tonnes). The overall aim of fisheries science is to provide information to managers on the state and life history of the stocks. Th...

  11. The skipjack fishery in Eastern Indonesia: distinguishing the effects of increasing effort and deploying rumpon FADs on the stock

    OpenAIRE

    Monintja, Dr; Mathews, Cp

    2000-01-01

    Rumpons, (fads) were widely deployed in Indonesia in the eighties. In the Halmahera area, rumpon increased cpue by 41% , landings of fish per ton of live bait increased by 24%, the consumption of diesel oil for tuna catches reduced by 46%, and profits increased from Rp 10 to 60 million by boat per year1. Tuna aggregation around rumpon increased catchability by more than 40% compared to free swimming tuna. The Halmahera skipjack fishery was assessed by combining catch and effort data from rump...

  12. Open-access databases as unprecedented resources and drivers of cultural change in fisheries science

    Energy Technology Data Exchange (ETDEWEB)

    McManamay, Ryan A [ORNL; Utz, Ryan [National Ecological Observatory Network

    2014-01-01

    Open-access databases with utility in fisheries science have grown exponentially in quantity and scope over the past decade, with profound impacts to our discipline. The management, distillation, and sharing of an exponentially growing stream of open-access data represents several fundamental challenges in fisheries science. Many of the currently available open-access resources may not be universally known among fisheries scientists. We therefore introduce many national- and global-scale open-access databases with applications in fisheries science and provide an example of how they can be harnessed to perform valuable analyses without additional field efforts. We also discuss how the development, maintenance, and utilization of open-access data are likely to pose technical, financial, and educational challenges to fisheries scientists. Such cultural implications that will coincide with the rapidly increasing availability of free data should compel the American Fisheries Society to actively address these problems now to help ease the forthcoming cultural transition.

  13. Ethical Concern in Joseph Heller’s Catch-22

    Institute of Scientific and Technical Information of China (English)

    XIAN Yu-jing

    2015-01-01

    In Catch-22, Joseph Heller shows his ethical concern behind absurdity, which is manifested from his attitude toward individualism and utilitarianism, religious belief, sexual promiscuity, interpersonal relationship, etc.

  14. Competition between static gear of the small-scale fisheries in Algarve waters (southern Portugal

    Directory of Open Access Journals (Sweden)

    K. ERZINI

    2012-12-01

    Full Text Available Parallel fishing trials with 0.30 mm diameter monofilament gill nets and longlines using small hooks were carried out in the Algarve (southern Portugal over a one-year period, 1997-1998, with the objective of comparing species composition, catch rates, discards and size ranges. Four hook sizes of 'Mustad' brand, round bent, flatted sea hooks (numbers 15, 13, 12 and 11 and four mesh sizes of 25, 30, 35 and 40 mm (nominal bar length of gill nets were used in the trials. Overall, 84 species were caught, with gill nets taking 71 species and longlines 54 species and with 41 species caught by both gears. The amount of discarding was higher for gill nets than for longlines. The catch species composition differed between the two gears, with the commercially valuable sea breams dominating the longline catches whereas small pelagics were relatively more important in the gill nets. Multivariate analysis showed a clear separation between the different sizes of the two gears both in terms of numbers and weights per species. Algarve gill netters and longliners fish the same species assemblage on the same fishing grounds, but have clearly different impacts in terms of catch species composition, catch rates and sizes. This information will be useful for the improved management of these small-scale, multi-species, multi-gear fisheries, where different gears compete for scarce resources. In particular this study provides a basis for a more rational allocation of licenses and control of fishing effort.

  15. Development of a System-wide Predator Control Program: Stepwise Implementation of a Predation Index, Predator Control Fisheries, and Evaluation Plan in the Columbia River Basin; Northern Pikeminnow Management Program, 1998 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    Young, Franklin R.; Wachtel, Mark L.; Petersen, Marc R.

    2003-03-01

    We are reporting on the progress of the Northern Pikeminnow Sport-Reward Fishery (NPSRF) in the lower Columbia and Snake rivers for 1998. The objectives of this project were to (1) implement a sport fishery that rewards anglers who harvest northern pikeminnow Ptychocheilus oregonensis {ge}279 mm (11 inches) total length, (2) collect catch data on selected fish species caught by fishery participants while targeting northern pikeminnow, (3) monitor and report incidental catch of sensitive salmonid species by anglers targeting northern pikeminnow and, (4) collect, monitor and report data on angler participation, catch and catch per angler day of northern pikeminnow during the season. A total of 108,903 northern pikeminnow {ge}279 mm were harvested during the 1998 season and 21,959 angler days were spent harvesting these fish. Harvest was below the seven year average of 150,874 and participation was well below the seven-year average of 51,013 angler days. Catch per angler day for all anglers during the season was 4.96 and exceeded the seven-year average of 2.96 northern pikeminnow per angler day. Peamouth Mylocheilus caurinus, and white sturgeon Acipencer transmontanus, were the other species most often harvested by returning NPSRF anglers targeting northern pikeminnow. Harvest of salmonids Oncorhynchus spp. by NPSRF anglers targeting northern pikeminnow remained below limits established by the National Marine Fisheries Service (NMFS).

  16. What's the catch? Validity of whaling data for Japanese catches of sperm whales in the North Pacific

    OpenAIRE

    Ivashchenko, Yulia V.; Clapham, Phillip J.

    2015-01-01

    The failure of international efforts to manage commercial whaling was exemplified by revelations of large-scale illegal whale catches by the USSR over a 30 year period following World War II. Falsifications of catch data have also been reported for Japanese coastal whaling, but to date there has been no investigation of the reliability of catch statistics for Japanese pelagic (factory fleet) whaling operations. Here, we use data of known reliability from Soviet whaling industry reports to sho...

  17. 75 FR 17070 - Fisheries in the Western Pacific; Hawaii Bottomfish and Seamount Groundfish Fisheries; Fishery...

    Science.gov (United States)

    2010-04-05

    ... recommended by the Council, and specified by NMFS, as 254,050 lb (115,235 kg) of Deep 7 bottomfish (74 FR... 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...

  18. 78 FR 54547 - Fisheries Off West Coast States; Highly Migratory Fisheries; California Drift Gillnet Fishery...

    Science.gov (United States)

    2013-09-04

    ... emergency rules (62 FR 44421; August 21, 1997) specify the following three criteria that define what an...; 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 ,...

  19. Catching the wave at its crest.

    Science.gov (United States)

    Schenke, R

    1995-09-01

    Leland Kaiser, PhD, a long-time member of the ACPE faculty, describes opportunities in terms of surfers. Many smaller and insignificant waves will appear before the surfer senses "the big one." The knowledgeable and skilled surfer will distinguish these small waves (mere fads in management terms) from the real one (a significant trend for the medical manager). If the surfer catches the big wave before its crest, there is a formidable danger of being too far in front and being crushed by it. If the surfer misjudges the wave and starts behind the crest, the wave will leave the surfer behind. It is only by catching the wave at or near its crest that the surfer has a chance for a long and exciting ride. And, of course, even having judged the wave perfectly, there is no guarantee of success. The surfer must still use his or her skills with daring and precision if the ride is to end in the calmer waters of the shore and not in the toss and tumble of a spill. PMID:10161232

  20. Globalization, nation-state and catching up

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Bresser-Pereira

    2008-12-01

    Full Text Available Globalization and nation-states are not in contradiction, since globalization is the present stage of capitalist development, and the nation-state is the territorial political unit that organizes the space and population in the capitalist system. Since the 1980s, Global Capitalism constitutes the economic system characterized by the opening of all national markets and a fierce competition between nation-states. Developing countries tend to catch up, while rich countries try to neutralize such competitive effort, using globalism as an ideology, and conventional orthodoxy as a strategy. Middle-income countries that are catching up in the realm of globalization are the ones that count with a national development strategy. This is broadly the case of the dynamic Asian countries. In contrast, Latin American countries have no longer their own strategy, and grow less. To add data to the argument, the author conducts an econometric test comparing these two groups of countries, and three variables: the rate of investment, the current account deficit or surplus that would indicate or not a competitive exchange rate, and public deficit.

  1. 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

  2. THE FRESHWATER FISHERIES LAW (»Narodne novine«, br. 106/01

    Directory of Open Access Journals (Sweden)

    Josip Suić

    2002-12-01

    Full Text Available The first chapter (Common regulations contains basic definitions as well as the vocabulary of the terms which were used in the text of the act, furthermore dividing of fishing waters, the work of the institutions registered for the freshwater fisheries and ecology of inland waters. Chapter II. deals with the conditions for commercial fisheries. In Chapter III., which is related to recreational–sports fisheries, the conditions for recreational–sports fisheries (fishing exams, fishing licences, fishing right, management acts, yearly plans fishguard service etc were defined, as well as the public empowering dedicated to the H[RS (The Croatian Sports Fisheries Association The Chapter IV contains conditions for the aquaculture. The protection of the fish is regulated in Chapter V. (selective fishing, restocking of fishing waters, no–fishing periods, minimal sizes of catch, fishing gear, compensation of damages. Chapter VI. contains regulations of usage of money funds collected on basis of fishing licences for recreational–sports fisheries, commercial fisheries and aquaculture. Chapter VII. is dealing with the system of data collecting in commercial fisheries, recreational–sports fisheries and aquaculture. Chapter VIII. regulates the administrative inspection (Ministry of Agriculture and Forestry and field inspection (State inspectorate and authorized official persons of Ministry of Internal Affairs. Chapter IX. — Special regulations — deals with foreign persons in aquaculture and fishing. Chapter X. contains the amounts of financial punishments. Transitional and final regulations in Chapter XI deal with the terms in which the Minister of agriculture and forestry should bring all the sub–laws on basis of this law. Also the terms are defined regarding the management acts and all the documents (permissions and exams

  3. 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

  4. File sharing

    NARCIS (Netherlands)

    N. van Eijk

    2011-01-01

    ‘File sharing’ has become generally accepted on the Internet. Users share files for downloading music, films, games, software etc. In this note, we have a closer look at the definition of file sharing, the legal and policy-based context as well as enforcement issues. The economic and cultural impact

  5. Impact of deep-sea fishery for Greenland halibut (Reinhardtius hippoglossoides) on non-commercial fish species off West Greenland

    DEFF Research Database (Denmark)

    Jørgensen, Ole A; Bastardie, Francois; Eigaard, Ole Ritzau

    2014-01-01

    . During the period 1988–2011, population abundance and size composition changed as catch and effort in the Greenland halibut fishery increased. Two species showed a significant decrease in abundance, and four populations showed a significant reduction in mean weight of individuals (p , 0.05). Correlation......Since the late 1980s, a deep-sea fishery for Greenland halibut (Reinhardtius hippoglossoides) has been developing gradually in West Greenland. Deep-sea fish species are generally long-lived and characterized by late age of maturity, low fecundity, and slow growth, features that probably cause low...... resilience following overexploitation. In order to evaluate whether populations of nine potential bycatch species are negatively affected by the commercial fishery for Greenland halibut, scientific data from bottom-trawl surveys conducted in the same area and period as the commercial fishery were analysed...

  6. Sharing Graphs

    CERN Document Server

    Sahasranand, K R

    2010-01-01

    Almost all known secret sharing schemes work on numbers. Such methods will have difficulty in sharing graphs since the number of graphs increases exponentially with the number of nodes. We propose a secret sharing scheme for graphs where we use graph intersection for reconstructing the secret which is hidden as a sub graph in the shares. Our method does not rely on heavy computational operations such as modular arithmetic or polynomial interpolation but makes use of very basic operations like assignment and checking for equality, and graph intersection can also be performed visually. In certain cases, the secret could be reconstructed using just pencil and paper by authorised parties but cannot be broken by an adversary even with unbounded computational power. The method achieves perfect secrecy for (2, n) scheme and requires far fewer operations compared to Shamir's algorithm. The proposed method could be used to share objects such as matrices, sets, plain text and even a heterogeneous collection of these. S...

  7. Shared leadership

    DEFF Research Database (Denmark)

    Ulhøi, John Parm; Müller, Sabine

    2012-01-01

    The aim of this paper is twofold. First, this paper comprehensively will review the conceptual and empirical literature to identify such critical underlying mechanisms which enable shared or collective leadership. Second, this article identifies the antecedents and outcomes of shared leadership...... according to the literature review to develop a re-conceptualised and synthesized framework for managing the organizational issues associated with shared leadership on various organizational levels. The paper rectifies this by identifying the critical factors and mechanisms which enable shared leadership...... and its antecedents and outcomes, and to develop a re-conceptualized and synthesized framework of shared leadership. The paper closes with a brief discussion of avenues for future research and implications for managers....

  8. 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

  9. 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.

  10. 76 FR 14367 - Fisheries in the Western Pacific; Mechanism for Specifying Annual Catch Limits and Accountability...

    Science.gov (United States)

    2011-03-16

    ...-Rulemaking Portal http://www.regulations.gov ; or ] Mail: Mail written comments to Michael D. Tosatto... available from http://www.regulations.gov and from the Council, 1164 Bishop St., Suite 1400, Honolulu, HI... approximately one year or less. The National Standard 1 guidelines, published by NMFS on January 16, 2009 (74...

  11. 76 FR 17808 - Fisheries in the Western Pacific; Mechanism for Specifying Annual Catch Limits and Accountability...

    Science.gov (United States)

    2011-03-31

    ...-Rulemaking Portal http://www.regulations.gov ; or Mail: Mail written comments to Michael D. Tosatto, Regional... , and from the Council, 1164 Bishop St., Suite 1400, Honolulu, HI 96813, tel 808-522-8220, fax 808-...

  12. Turkish pelagic gillnet fishery for swordfish and incidental catches in the Aegean Sea

    OpenAIRE

    Akyol, Okan; Ceyhan, Tevfik; ERDEM, Mustafa

    2012-01-01

    Abstract This study was carried out with 20 representative gill-netters based at the port of Sivrice and Sığacık from June 2008 to August 2010. The average length, gross tonnage (GT), machine power (hp) and number of personnel of the gill-netters were 10.4±0.6 m, 10.5±2.3 GT, 121.4±19.9 hp and 3.4±0.2 persons, respectively. Total length of all observed gillnets was reaching 339 km, ranged from 700 to 6000 m with average 2672 ±93 m. The mean CPUEs for swordfish by number and weight were calcul...

  13. Bioeconomics of Commercial Marine Fisheries of Bay of Bengal: Status and Direction

    Directory of Open Access Journals (Sweden)

    Ahasan Habib

    2014-01-01

    Full Text Available The fishery of the Bay of Bengal (BOB is assumed to be suffering from the overexploitation. This paper aims to assess the sustainability of current level of fishing effort as well as possible changes driven by anthropogenic and climate driven factors. Therefore, the commercial marine fishery of BOB for the period of 1985/86 to 2007/08 is analyzed by applying Gordon-Schaefer Surplus Production Model on time series of total catch and standardized effort. Static reference points such as open-access equilibrium, maximum economic yield, and maximum sustainable yield are established. Assumptions about potential climatic and anthropogenic effects on r (intrinsic growth rate and K (carrying capacity of BOB fishery have been made under three different reference equilibriums. The results showed that the fishery is not biologically overexploited; however, it is predicted to be passing a critical situation, in terms of achieving reference points in the near future. But, on the other hand, economic overfishing started several years before. Higher fishing effort, and inadequate institutional and legal framework have been the major bottlenecks for the proper management of BOB fisheries and these may leads fishery more vulnerable against changing marine realm. Thus, the present study calls for policy intervention to rescue the stock from the existing high fishing pressure that would lead to depletion.

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

    Institute of Scientific and Technical Information of China (English)

    TONG Yuhe; CHEN Xinjun; XU Liuxiong; CHEN Yong

    2013-01-01

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

  15. A bird's eye view of discard reforms: bird-borne cameras reveal seabird/fishery interactions.

    Science.gov (United States)

    Votier, Stephen C; Bicknell, Anthony; Cox, Samantha L; Scales, Kylie L; Patrick, Samantha C

    2013-01-01

    Commercial capture fisheries produce huge quantities of offal, as well as undersized and unwanted catch in the form of discards. Declines in global catches and legislation to ban discarding will significantly reduce discards, but this subsidy supports a large scavenger community. Understanding the potential impact of declining discards for scavengers should feature in an eco-system based approach to fisheries management, but requires greater knowledge of scavenger/fishery interactions. Here we use bird-borne cameras, in tandem with GPS loggers, to provide a unique view of seabird/fishery interactions. 20,643 digital images (one min(-1)) from ten bird-borne cameras deployed on central place northern gannets Morus bassanus revealed that all birds photographed fishing vessels. These were large (>15 m) boats, with no small-scale vessels. Virtually all vessels were trawlers, and gannets were almost always accompanied by other scavenging birds. All individuals exhibited an Area-Restricted Search (ARS) during foraging, but only 42% of ARS were associated with fishing vessels, indicating much 'natural' foraging. The proportion of ARS behaviours associated with fishing boats were higher for males (81%) than females (30%), although the reasons for this are currently unclear. Our study illustrates that fisheries form a very important component of the prey-landscape for foraging gannets and that a discard ban, such as that proposed under reforms of the EU Common Fisheries Policy, may have a significant impact on gannet behaviour, particularly males. However, a continued reliance on 'natural' foraging suggests the ability to switch away from scavenging, but only if there is sufficient food to meet their needs in the absence of a discard subsidy. PMID:23483906

  16. Rapid recovery of Dungeness crab within spatial fishery closures declared under indigenous law in British Columbia

    Directory of Open Access Journals (Sweden)

    Alejandro Frid

    2016-04-01

    Full Text Available Canada’s constitution grants indigenous people priority access to marine resources, yet indigenous, commercial and recreational fishers target the same species. Avoiding conflict between different users, therefore, requires evidence-based policies that manage fisheries for conservation while respecting indigenous rights. From 2006 to 2015, Canada’s Conservative government demoted the role of science in resource management, stifling research by federal agencies like Fisheries and Oceans Canada. To address ensuing data gaps, during 2014–2015 the Heiltsuk, Kitasoo/Xai’Xais, Nuxalk, and Wuikinuxv First Nations conducted coordinated research on Dungeness crab (Cancer magister, a culturally-significant resource. These indigenous groups are experiencing declining catch rates of Dungeness crab and postulate that commercial and recreational fisheries are primary causes of local declines. Accordingly, they applied indigenous laws and declared spatial fishery closures for commercial and recreational fishers at 10 sites (closed while allowing exploitation by all users to continue at 10 other sites (open. Sampling occurred repeatedly over time and analyses compared temporal trends in population characteristics between closed and open sites. Results were consistent with the hypothesis that fisheries decrease the abundance and size of exploited species, but spatial protection can reverse these effects. The body size and catch-per-unit effort of legal-sized males increased over time at closed sites but declined at open sites. Importantly, fishery status did not affect temporal changes in the relative abundance of unfished classes of crab–sublegal males and females–which is logically consistent with the hypothesis. Our study demonstrates that indigenous governance can create spatial closures for conservation and research when Canada’s government fails to do so. Long-term solutions, however, require collaboration in research and management between

  17. A bird's eye view of discard reforms: bird-borne cameras reveal seabird/fishery interactions.

    Directory of Open Access Journals (Sweden)

    Stephen C Votier

    Full Text Available Commercial capture fisheries produce huge quantities of offal, as well as undersized and unwanted catch in the form of discards. Declines in global catches and legislation to ban discarding will significantly reduce discards, but this subsidy supports a large scavenger community. Understanding the potential impact of declining discards for scavengers should feature in an eco-system based approach to fisheries management, but requires greater knowledge of scavenger/fishery interactions. Here we use bird-borne cameras, in tandem with GPS loggers, to provide a unique view of seabird/fishery interactions. 20,643 digital images (one min(-1 from ten bird-borne cameras deployed on central place northern gannets Morus bassanus revealed that all birds photographed fishing vessels. These were large (>15 m boats, with no small-scale vessels. Virtually all vessels were trawlers, and gannets were almost always accompanied by other scavenging birds. All individuals exhibited an Area-Restricted Search (ARS during foraging, but only 42% of ARS were associated with fishing vessels, indicating much 'natural' foraging. The proportion of ARS behaviours associated with fishing boats were higher for males (81% than females (30%, although the reasons for this are currently unclear. Our study illustrates that fisheries form a very important component of the prey-landscape for foraging gannets and that a discard ban, such as that proposed under reforms of the EU Common Fisheries Policy, may have a significant impact on gannet behaviour, particularly males. However, a continued reliance on 'natural' foraging suggests the ability to switch away from scavenging, but only if there is sufficient food to meet their needs in the absence of a discard subsidy.

  18. IMAS-Fish: Integrated MAnagement System to support the sustainability of Greek Fisheries resources. A multidisciplinary web-based database management system: implementation, capabilities, utilization and future prospects for fisheries stakeholde

    Directory of Open Access Journals (Sweden)

    S. KAVADAS

    2013-04-01

    Full Text Available This article describes in detail the “IMAS-Fish” web-based tool implementation technicalities and provides examples on how can it be used for scientific and management purposes setting new standards in fishery science. “IMAS-Fish” was developed to support the assessment of marine biological resources by: (i homogenizing all the available datasets under a relational database, (ii facilitating quality control and data entry, (iii offering easy access to raw data, (iv providing processed results through a series of classical and advanced fishery statistics algorithms, and (v visualizing the results on maps using GIS  technology. Available datasets cover among others: Fishery independent experimental surveys data (locations, species, catch compositions, biological data; Commercial fishing activities (fishing gear, locations, catch compositions, discards; Market sampling data (species, biometry, maturity, ageing; Satellite derived ocean data (Sea surface temperature, Salinity, Wind speed, Chlorophyll-a concentrations, Photosynthetically active radiation; Oceanographic parameters (CTD measurements; Official national fishery statistics; Fishing fleet registry and VMS  data; Fishing ports inventory; Fishing legislation archive (national and EU; Bathymetry grids. Currently, the homogenized database holds a total of more than 100,000,000 records. The web-based application is accessible through an internet browser and can serve as a valuable tool for all involved stakeholders: fisheries scientists, state officials responsible for management, fishermen cooperatives, academics, students and NGOs.

  19. Shared Attention.

    Science.gov (United States)

    Shteynberg, Garriy

    2015-09-01

    Shared attention is extremely common. In stadiums, public squares, and private living rooms, people attend to the world with others. Humans do so across all sensory modalities-sharing the sights, sounds, tastes, smells, and textures of everyday life with one another. The potential for attending with others has grown considerably with the emergence of mass media technologies, which allow for the sharing of attention in the absence of physical co-presence. In the last several years, studies have begun to outline the conditions under which attending together is consequential for human memory, motivation, judgment, emotion, and behavior. Here, I advance a psychological theory of shared attention, defining its properties as a mental state and outlining its cognitive, affective, and behavioral consequences. I review empirical findings that are uniquely predicted by shared-attention theory and discuss the possibility of integrating shared-attention, social-facilitation, and social-loafing perspectives. Finally, I reflect on what shared-attention theory implies for living in the digital world. PMID:26385997

  20. Qualitative mathematical models to support ecosystem-based management of Australia's Northern Prawn Fishery.

    Science.gov (United States)

    Dambacher, Jeffrey M; Rothlisberg, Peter C; Loneragan, Neil R

    2015-01-01

    A major decline in the catch of the banana prawn [shrimp], Penaeus (Fenneropenaeus) merguiensis, occurred over a six-year period in the Weipa region of the northeastern Gulf of Carpentaria, Australia. Three main hypotheses have been developed to explain this decline: (1) prawn recruitment collapsed due to overfishing; (2) recruitment collapsed due to a change in the prawn's environment; and (3) adult banana prawns were still present, but fishers could no longer effectively find or catch them. Qualitative mathematical models were used to link population biology, environmental factors, and fishery dynamics to evaluate the alternative hypotheses. This modeling approach provides the means to rapidly integrate knowledge across disciplines and consider alternative hypotheses about how the structure and function of an ecosystem affects its dynamics. Alternative models were constructed to address the different hypotheses and also to encompass a diversity of opinion about the underlying dynamics of the system. Key findings from these analyses are that: instability in the system can arise when discarded fishery bycatch supports relatively high predation pressure; system stability can be enhanced by management of fishing effort or stock catchability; catch per unit effort is not necessarily a reliable indicator of stock abundance; a change in early-season rainfall should affect all stages in the banana prawn's life cycle; and a reduced catch in the Weipa region can create and reinforce a shift in fishing effort away from Weipa. Results from the models informed an approach to test the hypotheses (i.e., an experimental fishing program), and promoted understanding of the system among researchers, management agencies, and industry. The analytical tools developed in this work to address stages of a prawn life cycle and fishery dynamics are generally applicable to any exploited natural. resource. PMID:26255373

  1. Application of resource accounting theory into fishery resource%资源价值核算理论在渔业资源中的应用

    Institute of Scientific and Technical Information of China (English)

    王雅丽; 陈新军; 李纲

    2012-01-01

    Fisheries resources is an kind of important marine natural resources,its output accounts for about 50% of China's marine economy.At present,China's coastal fishery resources is in the state of over-fishing,although fishing production is high but the individual catch become smaller and younger,and its sustainable development level is in low,the above problems are not really reflected in the existing national economic accounting system because of the lack of value accounting for fishery resources assets.Since the fishery resources have the characteristics such as hidden,migratory and shared,which make fisheries resources accounting face with many difficulties.Based on the theories and methods of natural resource accounting,combined with characteristics of fisheries resources,the paper propose the accounting methods and procedures for fishery resource,which will provised some guidances for sustainable use and scientific manage of fishery resources.%渔业资源是一种重要的海洋自然资源,其产值约占我国海洋经济的50%左右。目前,我国近海渔业资源处在过度捕捞的状态,尽管渔获产量高,但渔获物个体小型化、低龄化,可持续利用水平较低,这些问题在现行的国民经济核算体系中并没有真实的反映出来,原因在于未对渔业资源资产进行价值核算。由于渔业资源具有隐蔽性、洄游性及共享性等特点,使得对渔业资源核算面临着很多困难。通过对自然资源核算等理论和方法的分析,结合渔业资源特性,提出了开展渔业资源核算的方法和步骤,这对渔业资源可持续利用和科学管理具有一定的指导意义。研究亮点:由于人类过度捕捞等原因,世界传统经济鱼类出现了资源衰退。未进行价值核算和有偿使用是导致过度捕捞的原因之一。分析了自然资源核算的理论,结合渔业资源特性提出了开展渔业资源核算的方法,这对渔业资源科学管理具有一定的指导意义。

  2. CURRENT STATE AND DEVELOPMENT OF THE FISHERIES SECTOR OF UKRAINE IN THE CRISIS

    Directory of Open Access Journals (Sweden)

    І. Hrytsyniak

    2015-03-01

    Full Text Available Purpose. Fisheries has a strategic importance for supplying the population with food, while the sectors of the national economy with raw materials, for strengthening the country’s position in the international arena, for preserving spatial and national integrity of Ukraine, plays an important role in the restoration of natural resources and in the increase in employment. In recent years, fisheries sector of Ukraine is in a severe, protracted economic crisis. Considering its socio-economic and strategic importance for the state, there is a task for developing an effective policy for fisheries development in Ukraine that defines the relevance of the research and practical importance of its results. Thus, a compilation and analysis of the existing information on the current state and development of fisheries sector in the crisis period will allow a deeper understanding of problems in the fisheries sector in Ukraine and finding quick solutions. The main goal of the state policy in the field of fisheries in Ukraine has to be meeting the needs of the population in fish and fish products by creating conditions for effective operations and development of aquaculture and fishing enterprises. Findings. The article reviews the current state of the development of fisheries sector in Ukraine, consumption, catch, processing of fish and seafood, dynamics of fish product exports and imports, legislative and regulatory framework of fisheries sector, state of the implementation of WTO and EU requirements, as well as finding ways for the fisheries sector out from the crisis. Originality. This work is a compilation of the information on the current state of fisheries sector development in Ukraine. The information is provided in the form of a coherent presentation of information on the current state of fisheries sector in Ukraine, both in the domestic and foreign markets. Practical Value. The fact that the fisheries sector of Ukraine is still in a depressive state

  3. 75 FR 9158 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Coastal Sharks Fishery

    Science.gov (United States)

    2010-03-01

    ... National Oceanic and Atmospheric Administration RIN 0648-XU54 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Coastal Sharks Fishery AGENCY: National Marine Fisheries Service (NMFS), National... provisions of the Atlantic Coastal Fisheries Cooperative Management Act (Atlantic Coastal Act). The...

  4. 75 FR 33242 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery

    Science.gov (United States)

    2010-06-11

    ... National Oceanic and Atmospheric Administration RIN 0648-XW45 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery AGENCY: National Marine Fisheries Service (NMFS), National... the provisions of the Atlantic Coastal Fisheries Cooperative Management Act (Atlantic Coastal...

  5. 75 FR 44938 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Atlantic Coastal Shark Fishery

    Science.gov (United States)

    2010-07-30

    ... National Oceanic and Atmospheric Administration RIN 0648-XX28 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Atlantic Coastal Shark Fishery AGENCY: National Marine Fisheries Service (NMFS... Atlantic Coastal Fisheries Cooperative Management Act (Atlantic Coastal Act), based on the...

  6. 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...

  7. 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...

  8. 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...

  9. Assessment of Competition between Fisheries and Steller Sea Lions in Alaska Based on Estimated Prey Biomass, Fisheries Removals and Predator Foraging Behaviour.

    Science.gov (United States)

    Hui, Tabitha C Y; Gryba, Rowenna; Gregr, Edward J; Trites, Andrew W

    2015-01-01

    A leading hypothesis to explain the dramatic decline of Steller sea lions (Eumetopias jubatus) in western Alaska during the latter part of the 20th century is a change in prey availability due to commercial fisheries. We tested this hypothesis by exploring the relationships between sea lion population trends, fishery catches, and the prey biomass accessible to sea lions around 33 rookeries between 2000 and 2008. We focused on three commercially important species that have dominated the sea lion diet during the population decline: walleye pollock, Pacific cod and Atka mackerel. We estimated available prey biomass by removing fishery catches from predicted prey biomass distributions in the Aleutian Islands, Bering Sea and Gulf of Alaska; and modelled the likelihood of sea lions foraging at different distances from rookeries (accessibility) using satellite telemetry locations of tracked animals. We combined this accessibility model with the prey distributions to estimate the prey biomass accessible to sea lions by rookery. For each rookery, we compared sea lion population change to accessible prey biomass. Of 304 comparisons, we found 3 statistically significant relationships, all suggesting that sea lion populations increased with increasing prey accessibility. Given that the majority of comparisons showed no significant effect, it seems unlikely that the availability of pollock, cod or Atka mackerel was limiting sea lion populations in the 2000s.

  10. Vulnerability of male spider crab Maja brachydactyla (Brachyura: Majidae) to a pot fishery in south-west Ireland

    OpenAIRE

    Fahy, E; Carroll, J

    2009-01-01

    The Magharees fishery (Brandon and Tralee Bays in south-west Ireland) is 495 sq.km in extent, the majority of this area ≤20 m in depth. Since 1981 it has been occupied by a directed spider crab fishery yielding in some years all of the national catch of Maja brachydactyla. Maximum recorded landings were 336 t in 1999 and effort has numbered up to 10,000 pots annually. Increasing fishing capacity and declining opportunities have accentuated fishing effort on spider crab. This paper describes a...

  11. Knowledge Sharing

    DEFF Research Database (Denmark)

    Holdt Christensen, Peter

    The concept of knowledge management has, indeed, become a buzzword that every single organization is expected to practice and live by. Knowledge management is about managing the organization's knowledge for the common good of the organization -but practicing knowledge management is not as simple...... as that. This article focuses on knowledge sharing as the process seeking to reduce the resources spent on reinventing the wheel.The article introduces the concept of time sensitiveness; i.e. that knowledge is either urgently needed, or not that urgently needed. Furthermore, knowledge sharing...... is considered as either a push or pull system. Four strategies for sharing knowledge - help, post-it, manuals and meeting, and advice are introduced. Each strategy requires different channels for sharing knowledge. An empirical analysis in a production facility highlights how the strategies can be practiced....

  12. Empirical evidence for species-specific export of fish naïveté from a no-take marine protected area in a coastal recreational hook and line fishery

    OpenAIRE

    Alós, Josep; Puiggrós, Antoni; Díaz-Gil, Carlos; Palmer, Miquel; Rosselló, Rosario; Arlinghaus, Robert

    2015-01-01

    © 2015 Alós et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. No-take marine protected areas (MPAs) are assumed to enhance fisheries catch via the >spillover> effect, where biomass is exported to adjacent exploited areas. Recent studies in spearfishing fisheries suggest that the spillover of gear-naïve ...

  13. Catch variability and growth of pink shrimp (Farfantepenaeus paulensis in two coastal lagoons of uruguay and their relationship with ENSO events

    Directory of Open Access Journals (Sweden)

    Orlando Santana

    2015-09-01

    Full Text Available AbstractThe pink shrimp Farfantepenaeus paulensis (Pérez Farfante, 1967 is distributed along the Atlantic Coast from Bahia (Brazil to Mar del Plata (Argentina. The larval stages enter the Uruguayan brackish water lagoons during late spring to summer associated with tidal currents of the Brazilian Current. In such environments the growth is accelerated and in early autumn the individuals attain commercial size, supporting important regional artisanal fisheries. The pink shrimp catches from 1988 to 2013 were analyzed and related to phenomena of climate variability in ENSO events and to the growth of the species. The total catch ranges from 0.7 to 162 tons. The variation in catches has a negative relationship with the varied climatic events caused by El Niño. Growth parameters yielding values of L ∞ = 177 mm (total carapace length and K = 1.48 for the period 2009-2013. These values differ slightly from those calculated for natural populations in southern Brazil, suggesting that the population is the same and thus implying the need for coordinated fisheries management between the two countries.

  14. International Fisheries Agreements and Non-consumptive Values

    DEFF Research Database (Denmark)

    Pintassilgo, Pedro; Laukkanen, Marita; Kronbak, Lone Grønbæk;

    The management of internationally shared fish stocks is a major economic, environmental and political issue. According to international law, these resources should be managed cooperatively under international fisheries agreements (IFAs). This paper studies the formation and stability of IFAs...... is full non-cooperation. Hence, the trap of non-cooperation in international fisheries management cannot be overcome simply by explicitly accounting for non-consumptive values within IFAs. It is suggested that strengthening the role of IFAs and limiting the ability of non- member countries to free...

  15. 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 §...

  16. 50 CFR 679.6 - Exempted fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Exempted fisheries. 679.6 Section 679.6 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES OF THE EXCLUSIVE ECONOMIC ZONE OFF ALASKA General §...

  17. 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...

  18. Community-based Co-management in Vietnamese fisheries. The case of the Fisheries Associations in Tam Giang-Cau Hai Lagoon

    OpenAIRE

    Kim Anh, Nguyen Thi

    2012-01-01

    The open access fisheries regime has led to the degradation of marine resources and to conflicts in sharing them and the fishing grounds in Tam Giang Cau Hai lagoon in Thua Thien Hue, Vietnam. In 2003, community-based fisheries management (CBFM), particularly through Fisheries Associations (FA), was introduced and established. As of 2011, there were 62 local FAs. It means that local FAs have played an important role in the implementation of CBFM and as a major partner of the Government in pro...

  19. The impact of subsidies on the ecological sustainability and future profits from North Sea fisheries.

    Directory of Open Access Journals (Sweden)

    Johanna Jacomina Heymans

    Full Text Available BACKGROUND: This study examines the impact of subsidies on the profitability and ecological stability of the North Sea fisheries over the past 20 years. It shows the negative impact that subsidies can have on both the biomass of important fish species and the possible profit from fisheries. The study includes subsidies in an ecosystem model of the North Sea and examines the possible effects of eliminating fishery subsidies. METHODOLOGY/PRINCIPAL FINDINGS: Hindcast analysis between 1991 and 2003 indicates that subsidies reduced the profitability of the fishery even though gross revenue might have been high for specific fisheries sectors. Simulations seeking to maximise the total revenue between 2004 and 2010 suggest that this can be achieved by increasing the effort of Nephrops trawlers, beam trawlers, and the pelagic trawl-and-seine fleet, while reducing the effort of demersal trawlers. Simulations show that ecological stability can be realised by reducing the effort of the beam trawlers, Nephrops trawlers, pelagic- and demersal trawl-and-seine fleets. This analysis also shows that when subsidies are included, effort will always be higher for all fleets, because it effectively reduces the cost of fishing. CONCLUSIONS/SIGNIFICANCE: The study found that while removing subsidies might reduce the total catch and revenue, it increases the overall profitability of the fishery and the total biomass of commercially important species. For example, cod, haddock, herring and plaice biomass increased over the simulation when optimising for profit, and when optimising for ecological stability, the biomass for cod, plaice and sole also increased. When subsidies are eliminated, the study shows that rather than forcing those involved in the fishery into the red, fisheries become more profitable, despite a decrease in total revenue due to a loss of subsidies from the government.

  20. Mobility, expansion and management of a multi-species scuba diving fishery in East Africa.

    Directory of Open Access Journals (Sweden)

    Hampus Eriksson

    Full Text Available BACKGROUND: Scuba diving fishing, predominantly targeting sea cucumbers, has been documented to occur in an uncontrolled manner in the Western Indian Ocean and in other tropical regions. Although this type of fishing generally indicates a destructive activity, little attention has been directed towards this category of fishery, a major knowledge gap and barrier to management. METHODOLOGY AND PRINCIPAL FINDINGS: With the aim to capture geographic scales, fishing processes and social aspects the scuba diving fishery that operate out of Zanzibar was studied using interviews, discussions, participant observations and catch monitoring. The diving fishery was resilient to resource declines and had expanded to new species, new depths and new fishing grounds, sometimes operating approximately 250 km away from Zanzibar at depths down to 50 meters, as a result of depleted easy-access stock. The diving operations were embedded in a regional and global trade network, and its actors operated in a roving manner on multiple spatial levels, taking advantage of unfair patron-client relationships and of the insufficient management in Zanzibar. CONCLUSIONS AND SIGNIFICANCE: This study illustrates that roving dynamics in fisheries, which have been predominantly addressed on a global scale, also take place at a considerably smaller spatial scale. Importantly, while proposed management of the sea cucumber fishery is often generic to a simplified fishery situation, this study illustrates a multifaceted fishery with diverse management requirements. The documented spatial scales and processes in the scuba diving fishery emphasize the need for increased regional governance partnerships to implement management that fit the spatial scales and processes of the operation.

  1. Ecomorphology as a tool in fisheries: identification and ecotyping of Lake Tana barbs (Barbus intermedius complex), Ethiopia.

    OpenAIRE

    Sibbing, F.A.; Nagelkerke, L. A. J.; Osse, J.W.M.

    1994-01-01

    Fisheries development of Lake Tana, Ethiopia, urgently requires the identification of its unknown units of fish stock. A diversity of large barbs (up to 80 cm SL), lumped into one species Barbus intermedius and contributing over 35% of the annual catch, consists of at least thirteen distinct morphotypes (Nagelkerke et al., 1994), possibly species. Their abilities and limitations in food selection and feeding can be predicted from structural specializations following functional morphological m...

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

    Directory of Open Access Journals (Sweden)

    Steven L H Teo

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

  3. 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

  4. On China's lake fisheries development

    OpenAIRE

    Wu, W.; Yang, N.; Jin, L.

    1991-01-01

    An account is given of the current situation regarding the lake fisheries and fish culture practices in China. The modern lake fisheries take advantage of the 3-D spaces of lakes to fully develop the resources. Currently, the fisheries concentrate on the following 3 aspects: bringing the water body into full play; various types of aquaculture enclosures; and selective measures in resources protection, stocking and aquaculture.

  5. Fishery Economics and Game Theory

    OpenAIRE

    Grønbæk, Lone

    2000-01-01

    Game theory is an analytical tool for modeling strategic interaction between agents. Strategic interaction in fishery is interpreted as the harvest by one agent highly affects other agents’ decision. This paper is a commented literature study on the fishery economics and game theory. It tends to describe how fishery models using game theory are build up. These models consist of an underlying biological models and the game-theoretical computational concepts. The paper then describes different ...

  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...

  7. Fisheries management: what chance on coral reefs?

    OpenAIRE

    Russ, G R

    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.

  8. CROATIAN FRESHWATER FISHERY IN 2001 and 2002

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2003-09-01

    Full Text Available For each segment of freshwater fisheries — freshwater aquaculture, commercial and sport and recreational fisheries — there is a legal obligation for data submission to the Ministry of agriculture and forestry, Directorate of fisheries. Within the segments of commercial and sport and recreational fisheries the data submission obligation refers to the period beginning with the year 2003, while in the segment of aquaculture that obligation includes also the year 2002. Data collected for freshwater aquaculture contain the information on production of freshwater fish, total production areas, food, fertilizers and subsidies for freshwater fish farming. Data collected for commercial and sport and recreational fisheries contain the information on catch quantities and number of commercial and sport and recreational fishermen. Freshwater fish production in the year 2001 was 5,549. 50 tons, while the total fresh water fish production in the year 2002 decreased for 1.00% compared to the previous year, amounting to 5,501.07 tons. Although total fresh water fish production constantly decreases comparing to previous years, trout production has increased and the maximum production was noted in the year 2002. Total area of the freshwater fish farms in the year 2001 increased compared to the year 2000 for 2.14% amounting to 11,880.41 ha. Actual production area slightly increased in comparison to the previous year as well and amounted to 9,214.11 ha. In the year 2002 total area of freshwater fish farms was 11,491.29 ha, and 72.13% of that figure was the actual production area, that is 8,288.27 ha. Production per unit area in the year 2001 was 485.31 kg/ha for warm–water species and 280.44 t/ha for cold–water species. In the year 2002 production per unit area for warm–water species was 462.95 kg/ha, and for cold–water species 315.26 t/ha. During the year 2001, in total, 10,575.82 t of food was spent and 1,891 tons of fertilizers and lime, while in the

  9. Precordial Catch Syndrome in Elite Swimmers With Asthma.

    Science.gov (United States)

    Hayes, Don; Younger, Bradley R; Mansour, Heidi M; Strawbridge, Heather

    2016-02-01

    Precordial catch syndrome is a benign cause of chest pain in children and adolescents that remains underrecognized. Because of distinctive symptoms, precordial catch syndrome is not necessarily a diagnosis of exclusion. However, a detailed history eliciting diagnostic features is important, along with a physical examination excluding other pathologic disorders. We present the cases of 2 elite swimmers with asthma who had acute episodes of precordial catch syndrome, one associated with an acute asthma exacerbation and one not, while swimming during competitive swim meets that required rescue efforts for both and eventual evaluation in the emergency department. PMID:26835568

  10. Environmental and physiological variables during the catching of broilers

    Directory of Open Access Journals (Sweden)

    ML de V Queiroz

    2015-03-01

    Full Text Available The objective of this study was to determine the critical points of the operation of broiler catching for transport to the processing plant from animal and operational perspectives. During catching, chickens, environmental variables (temperature and relative humidity were constantly monitored to determine the Enthalpy Comfort Index (IEC. Also, the physiological variable rectal temperature (RT was monitored as an indicator of stress suffered by the birds during this handling procedure. Bird welfare were evaluated by analyzing their behavior. The bag method was effective to prevent the struggling of birds while being taken from the broiler house to the transport truck, reducing physical injuries and losses during catching.

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

    Science.gov (United States)

    Tong, Yuhe; Chen, Xinjun; Kolody, Dale

    2014-10-01

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

  12. Coping Strategies to Deal with Environmental Variability and Extreme Climatic Events in the Peruvian Anchovy Fishery

    Directory of Open Access Journals (Sweden)

    Marilú Bouchon

    2011-06-01

    Full Text Available The Peruvian anchovy fishery is the largest worldwide in terms of catches. The fishery started during the mid 1950s, and since then it has been highly dependent on natural stock fluctuations, due to the sensitivity of anchovy stocks to ocean-climate variability. The main driver of anchovy stock variability is the El Niño Southern Oscillation (ENSO, and three extreme ENSO warm events were recorded in 1972–1973, 1983–1984 and 1997–1998. This study investigates the evolution of coping strategies developed by the anchovy fisheries to deal with climate variability and extreme ENSO events. Results showed eight coping strategies to reduce impacts on the fishery. These included: decentralized installation of anchovy processing factories; simultaneous ownership of fishing fleet and processing factories; use of low-cost unloading facilities; opportunistic utilization of invading fish populations; low cost intensive monitoring; rapid flexible management; reduction of fishmeal price uncertainty through controlled production based on market demand; and decoupling of fishmeal prices from those of other protein-rich feed substitutes like soybean. This research shows that there are concrete lessons to be learned from successful adaptations to cope with climate change-related extreme climatic events that impact the supply of natural resources. The lessons can contribute to improved policies for coping with climate change in the commercial fishery sector.

  13. Fish market surveys indicate unsustainable elasmobranch fisheries in the Saudi Arabian Red Sea

    KAUST Repository

    Spaet, Julia L.

    2015-01-01

    Elasmobranch populations worldwide are severely threatened due to overexploited and unregulated fisheries. Despite the fact that sharks and rays are captured in fisheries operating along the Red Sea coast of the Kingdom of Saudi Arabia (KSA), information on any aspects of these fisheries are very limited. Here we document the structure, composition and biological characteristics of eastern Red Sea elasmobranch fisheries based on genetic identification and market survey data over an intensive two-year sampling period at the biggest Red Sea fish market in the KSA (Jeddah). Market surveys conducted two times per month between 2011 and 2013 revealed that 24 previously confirmed elasmobranch species for the Red Sea were landed by fishers and offered for sale. Genetic identification revealed two potentially undescribed guitarfish species as well as four batoid species not formerly reported from the Red Sea. Five coastal carcharhinid species dominated the landings-. Carcharhinus sorrah, C. amblyrhynchos, C. falciformis, C. limbatus, Rhizoprionodon acutus, together comprising 73% numerically of the total catch. Targeted shark fisheries reportedly exist in shark nursery areas. Most elasmobranchs outside of these areas were reportedly landed as bycatch. Most strikingly, the large majority of landed elasmobranchs were immature males or females below their reported size of sexual maturity, which suggests potential for both growth and recruitment overfishing and emphasizes the urgent need to implement region-specific management and conservation strategies to avoid the loss of these critical predators.

  14. FISHERIES ASSOCIATED WITH MANGROVE ECOSYSTEM IN INDONESIA: A View from a Mangrove Ecologist

    Directory of Open Access Journals (Sweden)

    SUKRISTIJONO SUKARDJO

    2004-01-01

    Full Text Available Blessed with mangrove area of some 9.6 million ha in extent, Indonesia represents an important country with fishery resources being a source of food an d nutrients. The fishery resources utilized by man, such as fishes, crustaceans and mollusks that are found in the mangrove ecosystem/swamp ar ea arc enormous. There is a range of species caught in the mangrove and surrounding areas with over 70 species. However, commercially valued species are limited to a few such as rabbit fish, snapper, grouper, marline catfish, fringe-scale sard ine, and anchovy. Leaf detritus from mangroves contribute a major energy input into fisheries. But information about the study on the relationship between fishery species and mangroves, ecologically and biologically, arc scanty. The mangrove is a physiographic unit, the principal components of which arc organisms. Therefore, the problems are predominantly of a biological nature (e.g., mangroves - fishery relationship. Positive correlation between the mangrove area and penaeid shrimp catch found in Indonesia, the Philippines, Australia and Mexico. Finally, the most important part of the variance of the MSY (Maximum Sustainable Yield of penaieds (53% of the variance could be explained by a combination of area of mangrove habitats and latitude.

  15. Impacts of distorted fishery statistical data on assessments of three surplus production models

    Institute of Scientific and Technical Information of China (English)

    WANG Yingbin; ZHENG Ji; WANG Zheng

    2011-01-01

    We evaluated the effect of various error sources in fishery harvest/effort data on the maximum sustainable yield (MSY) and corresponding fishing effort (EMSY) using Monte Carlo simulation analyses. A high coefficient of variation (CV) of the catch and effort values biased the estimates of MSY and EMSY. Thus, the state of the fisheries resource and its exploitation was overestimated. We compared the effect using three surplus production models, Hilborn-Waters (H-W), Schnute, and Prager models. The estimates generated using the H-W model were significantly affected by the CV. The Schnute model was least affected by errors in the underlying data. The CV of the catch data had a greater impact on the assessment than the CV of the fishing effort. Similarly, the changes in CV had a greater impact on the estimated maximum sustainable yield (MSY) than on the corresponding estimate of fishing effort (EMSY). We discuss the likely effect of these biases on management efforts and provide suggestions for the improvement of fishery evaluations.

  16. Catch Composition of Tsetse Flies (Glossina: Glossinidae

    Directory of Open Access Journals (Sweden)

    K. E. Okoh

    2011-01-01

    Full Text Available Problem statement: A study to determine the composition of tsetse flies species was conducted between January and December, 2007 in Kamuku National Park, Nigeria, using Biconical and Nitse traps. Tsetse flies were trapped along gallery forest in five streams for two trapping days and were collected daily. Approach: All tsetse flies caught were identified to species level, sexed, separated into teneral and non-teneral, hunger staged and Mean Hunger Stage computed. Fly density were calculated, the age structure examined using wing fray techniques for males and ovarian technique for females; the reproductive status of female flies were assessed. Two species of tsetse flies (Glossina palpalis palpalis robineau-desvoidy and Glossina tachinoides Westwood were caught in total of five hundred and two (502 flies. Out of these, 309(61.6% Glossina tachinoides and 193(38.4% G. palpalis were caught. Male catches (309, 61.6% were significantly (P Results: The estimated mean age for males was 11 days and females were 8 days. The insemination rate of 93.8% generally was high, G. tachinoides recorded 95.5% more than G. palpalis of 91.6%. Whereas parity rate (25.8% was low; G. palpalis was 37.4% while G. tachinoides parity rate is 17.2%. Conclusion: The study shows that two species of tsetse flies abound in the park although at low densities their presence may bear semblance to Trypanosomiasis and its impact to ecotourism.

  17. A review of the status and development of Kuwait's fisheries.

    Science.gov (United States)

    Al-Husaini, M; Bishop, J M; Al-Foudari, H M; Al-Baz, A F

    2015-11-30

    The status of Kuwait's fisheries landings and relative abundance for major species was reviewed using research data from Kuwait Institute for Scientific Research and landing data from the Kuwait's Central Statistical Bureau. Landing data showed significant decreases for major commercial species such as zobaidy (Pampus argenteus), suboor (Tenualosa ilisha), hamoor (Epinephelus coioides), newaiby (Otolithes ruber) and hamra (Lutjanus malabaricus) while abundance data for the shrimp Penaeus semisulcatus showed significant reduction in the recent years mainly because of overfishing. The catch-rate data showed continuous decline for major species such as zobaidy, newaiby and hamoor, which indicate that stock abundances of these species are low. The reduction in stock abundance in context with changes in habitat quality, particularly the effects of reduced discharge of the Shatt Al-Arab, is discussed.

  18. Lessons for fisheries management from the EU cod recovery plan

    DEFF Research Database (Denmark)

    Kraak, S.B.M.; Bailey, N.; Cardinale, M.;

    2013-01-01

    The performance of the EU long-term management plan for cod stocks, in force since 2009, is analysed focusing on the human and institutional factors. The plan operates through landings quotas (TACs) and effort restrictions following a Harvest Control Rule, and deploys a novel instrument allowing...... and real-time temporary closures. On the negative side, ignoring the dimension of fishers as reactive agents in the design, the impact assessment, and the annual implementation of the measures has contributed to the failure to adequately implement the plan and achieve its objectives. The main problem...... in targeted fisheries, although fishers experienced them as prohibiting the full uptake of other quotas. Recommendations for future plans include (i) management through catch rather than landings quotas, (ii) the internalisation of the costs of exceeding quotas, (iii) use of more selective gear types, (iv...

  19. A review of the status and development of Kuwait's fisheries.

    Science.gov (United States)

    Al-Husaini, M; Bishop, J M; Al-Foudari, H M; Al-Baz, A F

    2015-11-30

    The status of Kuwait's fisheries landings and relative abundance for major species was reviewed using research data from Kuwait Institute for Scientific Research and landing data from the Kuwait's Central Statistical Bureau. Landing data showed significant decreases for major commercial species such as zobaidy (Pampus argenteus), suboor (Tenualosa ilisha), hamoor (Epinephelus coioides), newaiby (Otolithes ruber) and hamra (Lutjanus malabaricus) while abundance data for the shrimp Penaeus semisulcatus showed significant reduction in the recent years mainly because of overfishing. The catch-rate data showed continuous decline for major species such as zobaidy, newaiby and hamoor, which indicate that stock abundances of these species are low. The reduction in stock abundance in context with changes in habitat quality, particularly the effects of reduced discharge of the Shatt Al-Arab, is discussed. PMID:26233306

  20. FISH CATCH IN THE AREA OF STRUGA COUNTY 1986 - 1997

    Directory of Open Access Journals (Sweden)

    Simo Georgiev

    1999-03-01

    Full Text Available This article presents data and analysis of the fish catch in the part of the lake of Ohrid under the concession of »Letnica« company from Struga in the period from 1986 to 1997. There are general tendencies of total catch decrease on one side, and great catch fluctuations of particular fish species in particular years. In the year 1988 a catch of 102 tons was recorded, while in 1997 only 26 tons were caught. All this indicates that this part of this biotop* and ecosystem of exclusive geographic, hydrographic, ecological, biological, taxonomic-evolutionary, phytogeographic, zoogeographic, ichthyologic and on its coasts cultural-civilisatory characteristics has not been managed reasonably.

  1. EMNE Catch-up Strategies in the Wind Turbine Industry

    DEFF Research Database (Denmark)

    Awate, Snehal; Larsen, Marcus M.; Mudambi, Ram

    2012-01-01

    Emerging economy multinationals (EMNEs) are catching up with advanced economy MNEs (AMNEs) even in emerging, high technology industries, where their knowledge-based disadvantages are most severe. We explain this phenomenon by distinguishing between output and innovation capabilities. Successful...

  2. 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...

  3. 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…

  4. 50 CFR 648.160 - Catch quotas and other restrictions.

    Science.gov (United States)

    2010-10-01

    ... standard, fishery stratification, and/or reports. (c) Allocation of TAL—(1) Recreational harvest limit. A... environmental, economic, and social impacts of the recommendations. The Regional Administrator shall...

  5. Does load uncertainty affect adaptation to catch training?

    Science.gov (United States)

    Berg, William P; Richards, Brian J; Hannigan, Aaron M; Biller, Kelsey L; Hughes, Michael R

    2016-09-01

    Catching relies on anticipatory and compensatory control processes. Load uncertainty increases anticipatory and compensatory neuromotor effort in catching. This experiment tested the effect of load uncertainty in plyometric catch/throw training on elbow flexion reaction time (RT), movement time (MT) and peak torque, as well as the distribution of anticipatory and compensatory neuromotor effort in catching. We expected load uncertainty training to be superior to traditional training for improving elbow flexion MT and peak torque, as well as for reallocating neuromotor effort from compensatory to anticipatory control in catching. Three groups of men (mean age = 21), load knowledge training (K) (n = 14), load uncertainty training (U) (n = 13) and control (C) (n = 14), participated. Groups K and U trained three times/week for 6 weeks using single-arm catch/throw exercises with 0.45-4.08 kg balls. Sets involved 16 repetitions of four different ball masses presented randomly. Group K had knowledge of ball mass on every repetition, whereas group U never did. Change scores were analyzed using Kruskal-Wallis tests and follow-up Wilcoxon rank-sum tests. Group K improved both RT and MT (by 6.2 and 12 %, respectively), whereas group U did not. Both groups K and U improved peak eccentric elbow flexion torque. Group K reallocated neuromotor effort from compensatory to anticipatory processes in the biceps, triceps and the all muscle average, whereas group U did so in the triceps only. In sum, plyometric catch/throw training caused a reallocation of neuromotor effort from compensatory to anticipatory control in catching. However, load uncertainty training did not amplify this effect and in fact appeared to inhibit the reallocation of neuromotor effort from compensatory to anticipatory control.

  6. Assessment of selenium mineralization and availability from catch crops

    OpenAIRE

    Stavridou, Eleftheria; Thorup-Kristensen, Kristian; Scott D. Young

    2011-01-01

    Selenium (Se) release from four plant species (Indian mustard, fodder radish, Italian ryegrass and hairy vetch) was measured under controlled leaching conditions and in a pot incubation experiment as part of a study of the potential for using these plant species as Se catch crops. Catch crops may reduce Se leaching and, by subsequent release of Se from the plant material, increase the available Se for succeeding crops. Plants grown both without and with Se addition (250 g Se/ha) were tested. ...

  7. Integrating individual trip planning in energy efficiency – Building decision tree models for Danish fisheries

    DEFF Research Database (Denmark)

    Bastardie, Francois; Nielsen, J. Rasmus; Andersen, Bo Sølgaard;

    2013-01-01

    integrate detailed information on vessel distribution, catch and fuel consumption for different fisheries with a detailed resource distribution of targeted stocks from research surveys to evaluate the optimum consumption and efficiency to reduce fuel costs and the costs of displacement of effort. The energy...... hypothetical conditions influencing their trip decisions, covering the duration of fishing time, choice of fishing ground(s), when to stop fishing and return to port, and the choice of the port for landing. Fleet-based energy and economy efficiency are linked to the decision (choice) dynamics. Larger fuel...... efficiency for the value of catch per unit of fuel consumed is analysed by merging the questionnaire, logbook and VMS (vessel monitoring system) information. Logic decision trees and conditional behaviour probabilities are established from the responses of fishermen regarding a range of sequential...

  8. Historical and contemporary evidence of a mutton snapper ( Lutjanus analis Cuvier, 1828) spawning aggregation fishery in decline

    Science.gov (United States)

    Graham, R. T.; Carcamo, R.; Rhodes, K. L.; Roberts, C. M.; Requena, N.

    2008-06-01

    Scientific information on reef fish spawning aggregation fisheries is sparse in light of numerous regional declines and extirpations from overexploitation. Fisher interviews of the small-scale commercial mutton snapper ( Lutjanus analis) spawning aggregation fishery at Gladden Spit, Belize, suggests a historic decadal decline. The reported trend is supported by analysis of inter-seasonal catch and effort and yield (2000 2002) that reveals a 59% decline in catch per unit effort (CPUE) and a 22% decrease in mean landings per boat. Declining population-level trends are also supported by a significant decrease in inter-annual median lengths of mutton snappers (2000 2006). These findings demonstrate the need for additional life history information that includes length-associated age and details on growth to provide clearer support of the effects on, and responses by, populations following fishing. In view of the historical changes to mutton snapper CPUE and landings at Gladden Spit and the fishery-associated declines in fish spawning aggregations observed globally, a precautionary approach to spawning aggregation management is warranted that provides full protection from fishing to enhance population persistence. The findings also highlight the need for substantially greater enforcement and long-term fisheries monitoring under a comprehensive regional management strategy.

  9. Estimating fish exploitation and aquatic habitat loss across diffuse inland recreational fisheries.

    Directory of Open Access Journals (Sweden)

    Derrick Tupper de Kerckhove

    Full Text Available The current state of many freshwater fish stocks worldwide is largely unknown but suspected to be vulnerable to exploitation from recreational fisheries and habitat degradation. Both these factors, combined with complex ecological dynamics and the diffuse nature of inland fisheries could lead to an invisible collapse: the drastic decline in fish stocks without great public or management awareness. In this study we provide a method to address the pervasive knowledge gaps in regional rates of exploitation and habitat degradation, and demonstrate its use in one of North America's largest and most diffuse recreational freshwater fisheries (Ontario, Canada. We estimated that (1 fish stocks were highly exploited and in apparent danger of collapse in management zones close to large population centres, and (2 fish habitat was under a low but constant threat of degradation at rates comparable to deforestation in Ontario and throughout Canada. These findings confirm some commonly held, but difficult to quantify, beliefs in inland fisheries management but also provide some further insights including (1 large anthropogenic projects greater than one hectare could contribute much more to fish habitat loss on an area basis than the cumulative effect of smaller projects within one year, (2 hooking mortality from catch-and-release fisheries is likely a greater source of mortality than the harvest itself, and (3 in most northern management zones over 50% of the fisheries resources are not yet accessible to anglers. While this model primarily provides a framework to prioritize management decisions and further targeted stock assessments, we note that our regional estimates of fisheries productivity and exploitation were similar to broadscale monitoring efforts by the Province of Ontario. We discuss the policy implications from our results and extending the model to other jurisdictions and countries.

  10. 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...

  11. 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...

  12. 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...

  13. 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...

  14. 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...

  15. 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...

  16. Dynamic ocean management increases the efficiency and efficacy of fisheries management.

    Science.gov (United States)

    Dunn, Daniel C; Maxwell, Sara M; Boustany, Andre M; Halpin, Patrick N

    2016-01-19

    In response to the inherent dynamic nature of the oceans and continuing difficulty in managing ecosystem impacts of fisheries, interest in the concept of dynamic ocean management, or real-time management of ocean resources, has accelerated in the last several years. However, scientists have yet to quantitatively assess the efficiency of dynamic management over static management. Of particular interest is how scale influences effectiveness, both in terms of how it reflects underlying ecological processes and how this relates to potential efficiency gains. Here, we address the empirical evidence gap and further the ecological theory underpinning dynamic management. We illustrate, through the simulation of closures across a range of spatiotemporal scales, that dynamic ocean management can address previously intractable problems at scales associated with coactive and social patterns (e.g., competition, predation, niche partitioning, parasitism, and social aggregations). Furthermore, it can significantly improve the efficiency of management: as the resolution of the closures used increases (i.e., as the closures become more targeted), the percentage of target catch forgone or displaced decreases, the reduction ratio (bycatch/catch) increases, and the total time-area required to achieve the desired bycatch reduction decreases. In the scenario examined, coarser scale management measures (annual time-area closures and monthly full-fishery closures) would displace up to four to five times the target catch and require 100-200 times more square kilometer-days of closure than dynamic measures (grid-based closures and move-on rules). To achieve similar reductions in juvenile bycatch, the fishery would forgo or displace between USD 15-52 million in landings using a static approach over a dynamic management approach.

  17. Libraries Sharing Technology for Sharing

    OpenAIRE

    Morrison, Heather; Stranack, Kevin; Mussell, Jessica

    2006-01-01

    Recent resource sharing technology developments in the western Canadian consortia, BC Electronic Library Network and COPPUL are discussed. Highlights include the shelf status project of BC ELN, combining the functionality of a union catalogue with live lookup of circulation status via Z39.50, a tagging feature for the locally developed A to Z list CJDB (CUFTS Journal Database), a locally developed federated search tool, dbwiz, the Open Journal Systems software of the Public Knowledge Project,...

  18. Development of a Systemwide Predator Control Program, Volume I : Stepwise Implementation of a Predation Index, Predator Control Fisheries, and Evaluation Plan in the Columbia River Basin, 1993 annual report.

    Energy Technology Data Exchange (ETDEWEB)

    Willis, Charles F.; Ward, David L.

    1995-06-01

    Modified Merwin trap nets were tested by an experimental fishery in the Columbia River downstream from McNary Dam to determine their effectiveness in selectively harvesting northern squawfish (Ptychocheilus oregonensis) over 11 inches in total length. The fishery was evaluated for its potential to supplement exploitation rates of the sportreward and dam-angling fisheries to achieve the objectives of the northern squawfish management program. Special consideration was given to the potential for, and impact on, incidental catches of adult salmonids (Oncorhynchus spp.) listed as threatened and endangered under the Endangered Species Act (ESA). Preseason site and data surveys identified suitable fishing locations where physical parameters are favorable to trap-net deployment and northern squawfish habitat was present. A total of 16 floating trap nets were operated from June 2 through August 4, 1993. We made 1,392 sets with a mean soak time of 2.9 hours. The total catch was 45,803 fishes including 10,440 (23% of the total catch) northern squawfish of which 1,688 (4% of the total catch) were large (greater than 11 inches in total length). Mean catch rate was 0.3 large northern squawfish per hour of soak time. Nearly all incidentally captured fishes were released alive and in good condition. Bycatch of adult salmonids totaled 1,036 fishes (2% of the total catch). Operational criteria, designed to limit incidental take of salmonids, restricted the fishing time, dates, and locations. In addition, lack of prior operating experience with the gear type and limited gear effectiveness in high velocities found in the free-flowing river below Bonneville Dam contributed to the low harvest rate for northern squawfish. We determined that a large scale floating trap-net fishery outside the boat restricted zones (BRZs) of hydropower projects would not significantly improve the exploitation rate of northern squawfish either above or below Bonneville Dam.

  19. From Reef to Table: Social and Ecological Factors Affecting Coral Reef Fisheries, Artisanal Seafood Supply Chains, and Seafood Security.

    Directory of Open Access Journals (Sweden)

    John N Kittinger

    Full Text Available Ocean and coastal ecosystems provide critical fisheries, coastal protection, and cultural benefits to communities worldwide, but these services are diminishing due to local and global threats. In response, place-based strategies involve communities and resource users in management have proliferated. Here, we present a transferable community-based approach to assess the social and ecological factors affecting resource sustainability and food security in a small-scale, coral reef fishery. Our results show that this small-scale fishery provides large-scale benefits to communities, including 7,353 ± 1547 kg yr(-1 (mean ± SE of seafood per year, equating to >30,000 meals with an economic value of $78,432. The vast majority of the catch is used for subsistence, contributing to community food security: 58% is kept, 33.5% is given away, and 8.5% is sold. Our spatial analysis assesses the geographic distribution of community beneficiaries from the fishery (the "food shed" for the fishery, and we document that 20% of seafood procured from the fishery is used for sociocultural events that are important for social cohesion. This approach provides a method for assessing social, economic, and cultural values provided by small-scale food systems, as well as important contributions to food security, with significant implications for conservation and management. This interdisciplinary effort aims to demonstrate a transferable participatory research approach useful for resource-dependent communities as they cope with socioeconomic, cultural, and environmental change.

  20. A popular and potentially sustainable fishery resource under pressure–extinction risk and conservation of Brazilian Sciaenidae (Teleostei: Perciformes

    Directory of Open Access Journals (Sweden)

    Ning Labbish Chao

    2015-07-01

    Full Text Available Croakers (Sciaenidae are major fishery resource in Brazil; constituting 22% of marine and 9% of freshwater fishery landings. Croakers are subject to heavy fishing pressure throughout Brazil, but habitat alteration is also an important threat to regional populations. In this regional Sciaenidae assessment, each species was analyzed for relative risk of extinction, including the identification and quantification of the impact of major threats and existing conservation measures, based on application of the Categories and Criteria of the IUCN Red List of Threatened Species. Of the 52 species of Sciaenid fishes (34 marine and 18 freshwater present in Brazilian waters, the majority are at low risk of extinction, with 10 species classified as Data Deficient (DD and 36 as Least Concern (LC. However the Southern black drum (Pogonias cromis, listed as Endangered (EN is the most threatened species in the region, while three other species are classified as Near Threatened (NT. A large portion of Brazilian croakers is landed by small-scale artisanal fisheries, which are scattered along coastal and riverine communities. However, our assessments reveal that available fishery landing statistics may have greatly underestimated the artisanal fishery production and by-catch of Sciaenids. We recommend establishing, with adequate enforcement, coastal and riverine protected areas as well as strategic fishing seasons to improve and maintain the conservation status of Sciaenids and sustainable Sciaenid fisheries.

  1. 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.

  2. 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.

  3. Field experiments to improve the efficacy of gargoor (fish trap) fishery in Kuwait's waters

    Institute of Scientific and Technical Information of China (English)

    CHEN Weizhong; AL-BAZ Ali; BISHOP James M.; AL-HUSAINI Mohsen

    2012-01-01

    Fish traps were investigated to understand the effects of season,bait type,trap size,and trap soak time on catch rates,catch composition,and trap loss rates from March 2004 to September 2005,to improve the performance and management of Kuwait's gargoor (cage style fish trap) fishery,which used to be the nation's most important one in terms of value and landings volume.Catch rates were the highest in April/May (5-8 kg/trap haul) and again in December (7 kg/trap haul).Bait type and trap size also affected catch rates and species composition.Of the seven baits tested,the best catch rates,>5 kg/trap haul,occurred with cuttlefish (Sepia pharaonis),but wolf-herring (Chirocentrus dorab) and mullet (Liza klunzingerf) also produced good results (4-5 kg/trap haul).Within the five tested sizes,the two largest-sized traps captured more fish and larger size fish.Analysis of variance (ANOVA) showed significant differences of catch rate among traps with different baits as well as among traps ofdifferent sizes.Duncan test further revealed these differences between two specific baits and sizes.Cluster Analysis of species composition showed more differences among different baits than among different trap sizes.Longer soak times did not result in larger catch rates,but increased trap loss.About 10-day soak time resulted in trap loss 7%,while 40-day soak time could result in a loss of around 20%.Consequently,it is recommended that the gargoor be checked every 10 or fewer days.The average overall catch rate during the study period was lower than that of 1980s (4.5 vs.5.8 kg/trap haul),indicating a possible decline of fish abundance in Kuwait's waters.It is recommended that the number of gargoor fishing boats and gargoors from each boat should be limited to allow stock rehabilitation.

  4. 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.

  5. Guam's Small-Boat-based Fisheries

    OpenAIRE

    Myers, Robert F.

    1993-01-01

    Recent trends in Guam's small-boat fisheries and current knowledge of their biology, management, and economics are summarized. Annual estimates of participation, effort, and harvest are given for the pelagic and bottomfish fisheries for 1980-91 and for the spearfishing and atulai fisheries for 1985. The pelagic fishery is the largest, with annual landings ranging from 168 to 364 metric tons (t), followed by the bottomfish fishery (14-43 t), spearfishingf ishery (517 t), and bigeye scad fisher...

  6. ICHTHYOLOGICAL ASPECTS OF THE MATERIALITITY HARM TO FISHERIES DETERMINING

    Directory of Open Access Journals (Sweden)

    І. Нrytsyniak

    2013-09-01

    Full Text Available Purpose. Definition and analysis of biological criteria for qualified materiality harm caused by the fishing industry as a result of illegal extraction of water biological resources. Methodology. The calculations were carried out for the top of the Kanev reservoir and were based on data from the Water of Life reserves the Kanev reservoir identified Institute of Fisheries NAAS within acceptable elaboration of industrial catches for 2013 year. Index of an average natural mortality were determined by the method of P.V. Tyurin. In the calculations indicators used listed in the acting regulatory and technical literature. Findings. As a criterion for determining the materiality of damage used daily natural mortality rate, which is accepted at 0,1 % of the balance. It is established that for certain types of top of the Kanev reservoir extraction already 1 ind., can lead to consequences that are assessed as significant. However, the simultaneous extraction of several species in an amount which is less than the limit also requires evaluation from the standpoint of materiality. To this end, proposed criterion is expensive - in calculating losses greater than 266 tax-free minimum incomes of citizens, damage fisheries can be considered significant. Originality. First proposed procedure for assessing the impact on the ichthyopopulation of illegal fishing from the standpoint of materiality damage. Practical value. The results are used in the preparation of expert reports for regulatory environmental agencies.

  7. Fisheries And Aquaculture Resources And Their Interactions With Environment in Turkey

    Science.gov (United States)

    Deniz, H.

    2003-04-01

    Turkey, with 8333 km of coast line, 151 080 sq. km economic sea area, many rivers with 177 714 total length, nearly, 1 million ha of natural lakes, 500 000 ha of dam reservoirs has rich marine and inland aquatic resource potential. Despite of these large resources, Turkish fisheries has the characteristics of small-scale fisheries and in general it can be considered as coastal fisheries. There is also great potential for inland fisheries and aquaculture. Being in half closed position, these seas have different characteristics in respect of biological, physical, chemical and ecological points. In addition; Turkey has favourable geographic position between the Black Sea and Mediterranean Sea. Nevertheless, this potential seems not to be fully utilised and therefore fisheries is not a major sector in the economy. According to the statistics of the fisheries for 2000 published by the Turkish government, Turkey's total fisheries production was 582.376 tons. Total catch consists sea fish (441 690 tons, crustaceans and molluscs (18 831 tons), freshwater fish (42.824 tons) and aquaculture (79. 031 tons). The Ministry of Agriculture and Rural Affairs (MARA) is the Ministry responsible for the overall fisheries and aquaculture development, administration, regulation, promotion and technical assistance. In the past two decades, marine fish farming using net cages has developed in the coastal waters throughout Turkey. Such fish farming has allowed the production of large amounts of valuable fish and their supply to the internal and external markets on a regular basis. However, fish farming is sometimes fallowed by organic pollution of the water and bottom sediment in the vicinity of the cages. A comprehensive land and coastal planning survey of almost the whole coast of Turkey is currently being conducted. This master plan designates areas to be developed for forestry, agriculture, industry, urbanisation, environmentally protected areas, etc. The plan was undertaken before the

  8. The political economy of the fisheries sector in Uganda: ruling elites, implementation costs and industry interests

    DEFF Research Database (Denmark)

    Kjær, Anne Mette; Muhumuza, Fred; Mwebaze, Tom;

    This paper sets out to explain policies, implementation arrangements and results (PIRs) in Uganda’s fisheries sector. Industry actors wanted to be able to keep up with European standards in order to survive in the chilled and frozen fillet export industry. They put pressure on ruling elites...... to support the establishment of effective hygiene and testing procedures. This helped the fishing industry succeed to an extent that helped create interests in the status quo. Fishermen, their dependents, and the fish processors all wanted to maintain a high level of fish catches. It was politically costly...... for ruling elites to enforce fisheries management because strict enforcement was unpopular with fishermen, as well as with many fishermen and security agents who benefitted from illegal fishing. Therefore, the success was not maintained: a pocket of efficiency was established with regard to hygiene...

  9. 75 FR 22103 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Atlantic Coastal Shark Fishery

    Science.gov (United States)

    2010-04-27

    ... National Oceanic and Atmospheric Administration RIN 0648-XV13 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Atlantic Coastal Shark Fishery AGENCY: National Marine Fisheries Service (NMFS...-compliance; Declaration of a moratorium. SUMMARY: In accordance with the Atlantic Coastal...

  10. 78 FR 51131 - Fisheries of the Northeastern United States; Atlantic Coastal Fisheries Cooperative Management...

    Science.gov (United States)

    2013-08-20

    ... United States; Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Advance notice of proposed rulemaking. SUMMARY: Based on Atlantic States Marine...

  11. Linking fishery management and conservation in a tropical estuarine lagoon: biological and physical effects of an artisanal fishing gear

    Science.gov (United States)

    Rueda, M.; Defeo, O.

    2003-04-01

    Information coming from fishery monitoring, surveys and experimental fishing with participation of fishers was employed to determine the impact of an artisanal gear, 'boliche', on the biodiversity of the Ciénaga Grande de Santa Marta (CGSM), an estuarine lagoon on the Caribbean coast of Colombia. Fishery monitoring (catch data) included landings before (1968 and 1978) and after (1994-1996) the introduction of the boliche in the CGSM (1985), whereas surveys were conducted seasonally during 1993-1994. Fishing experiments involved evaluating different mesh sizes and the short-term effect of physical disturbance by the boliche. Monitoring suggested potential trophic effects of this fishing gear: the catch of large, long-lived, carnivorous species declined after the introduction of the boliche in the CGSM, whereas catch rates of smaller, shorter-lived, and lower trophic level species increased. Surveys revealed that the boliche retained 41 species. The by-catch made up 62% of the total catch and the remaining 38% involved the three target species Eugerres plumieri, Mugil incilis and Cathorops spixii. Selectivity experiments showed that 2.5 in. stretched mesh size gill nets caught more species than the 3.0-in. mesh. The smaller mesh also increased the risk of a critical reduction in the spawning stock of target species (notably E. plumieri); a situation that could affect the fish community if mesh sizes lower than 2.5 in. were intensively used. Suspended particulate matter significantly increased after fishing activity, with higher resuspension on mud-shells and mud substrata, whereas dissolved oxygen showed no appreciable changes after fishing operations. Notwithstanding, the activity of the boliche would generate sediment resuspension between 382 and 470 t day -1, which could lead to potential cascade impacts on water quality. We propose a framework of redundancy in management measures in order to simultaneously reach management and conservation goals.

  12. Pacific Coast Groundfish Individual Fishing Quota Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — On January 11, 2011, NOAA Fisheries implemented a new fishery management system for the West Coast Groundfish Trawl Catch Share Program as specified in the...

  13. 77 FR 69426 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-11-19

    ... available from: Dr. Christopher M. Moore, Executive Director, Mid-Atlantic Fishery Management Council, Suite... Part 648 Fisheries, Fishing, Recordkeeping and reporting requirements. Dated: November 14, 2012. Alan...

  14. Interspecific resource competition effects on fisheries revenue.

    Directory of Open Access Journals (Sweden)

    Karen E van de Wolfshaar

    Full Text Available In many fisheries multiple species are simultaneously caught while stock assessments and fishing quota are defined at species level. Yet species caught together often share habitat and resources, resulting in interspecific resource competition. The consequences of resource competition on population dynamics and revenue of simultaneously harvested species has received little attention due to the historical single stock approach in fisheries management. Here we present the results of a modelling study on the interaction between resource competition of sole (Solea solea and slaice (Pleuronectus platessa and simultaneous harvesting of these species, using a stage-structured population model. Three resources were included of which one is shared with a varied competition intensity. We find that plaice is the better competitor of the two species and adult plaice are more abundant than adult sole. When competition is high sole population biomass increases with increasing fishing effort prior to plaice extinction. As a result of this increase in the sole population, the revenue of the stocks combined as function of effort becomes bimodal with increasing resource competition. When considering a single stock quota for sole, its recovery with increasing effort may result in even more fishing effort that would drive the plaice population to extinction. When sole and plaice compete for resources the highest revenue is obtained at effort levels at which plaice is extinct. Ignoring resource competition promotes overfishing due to increasing stock of one species prior to extinction of the other species. Consequently, efforts to mitigate the decline in one species will not be effective if increased stock in the other species leads to increased quota. If a species is to be protected against extinction, management should not only be directed at this one species, but all species that compete with it for resource as well.

  15. Socio-economic features of commercial fishery in the bordering upper Danube River area of Serbia.

    Science.gov (United States)

    Smederevac-Lalić, Marija; Pešić, Radmilo; Cvejić, Slobodan; Simonović, Predrag

    2012-05-01

    The multidisciplinary socio-economic study of fisheries in the bordering part of the Danube River between Serbia and Croatia (at the following sites: Apatin, Bačka Palanka, Bačko Novo Selo, Bezdan, and Sombor) that was performed in order to investigate various aspects of fish resource utilization (management, policy of protection and exploitation of freshwater fishery resources, present fisheries legislation, catch statistics), was realized during 2004 and 2005. Data were collected via survey with a structured interview. Socio-economic circumstances, together with ecological factors, have had an influence on the fish stock and number of commercial fishermen. Awareness of the occurring problems, both economic and ecological ones, is apparent, regardless of whether it is assessed in the field of commercial or recreational fishing. Fishery sector in Serbia is in a prolonged process of transition, with the enforcement of fishing regulations, but also the lack of control that leaves space for illegal commercial fishing. The statements, consciousness, experience and behavior of commercial fishermen represent a good basis for planning the sustainable development of fishing in this section of the Danube River.

  16. Landscape Influences on Fisher Success: Adaptation Strategies in Closed and Open Access Fisheries in Southern Chile

    Directory of Open Access Journals (Sweden)

    Tracy Van Holt

    2012-03-01

    Full Text Available Determinants of fisher success in southern Chile's loco (Concholepas concholepas fishery are examined by comparing fisher success in exclusive access territories that vary in relationship to tree-plantation development, which can affect shellfish quality. The relative importance of fishers' experience and capture technology (traditional measures of fisher success are evaluated against environmental and geospatial characteristics. While knowledge and technology explained variation in catches, this did not translate into higher prices or profit. Fishers succeeded (gained higher prices for locos and had higher monthly incomes from their management areas when they harvested shellfish from closed (exclusive nearshore management areas where the environmental condition produced high quality locos regardless of their fishing experience, technology, and the geospatial features of management areas. Experienced fishers who worked in management areas near tree plantations that fail to produce resources of sufficient quality shifted to offshore fisheries where their experience counted. Offshore fishers working in the congrio (Genypterus chilensis fishery likely exposed themselves to more risk and benefited from their experience and available technology; environmental condition and geospatial factors played little role in their success (price. Closed management areas provided resources to harvest, but may reduce a fisher's ability to adapt to environmental change because success depends on environmental factors outside of a fisher's control. Fishers were not financially rewarded for their experience or their technology in the loco fishery.

  17. Potential economic impacts of achieving good environmental status in Black Sea fisheries

    Directory of Open Access Journals (Sweden)

    Ian C. Goulding

    2014-09-01

    Full Text Available The Marine Strategy Framework Directive (MSFD mandates that European Union (EU member states achieve Good Environmental Status (GEnS based on an ecosystem-based approach to management. For commercial fisheries, the primary target under the MSFD is one of maximum sustainable yield. Of Black Sea riparian nations, only Romania and Bulgaria are EU member states. Focusing at the supranational level, we review institutions and instruments relevant to management of the Black Sea. The economic values of current fish catches are assessed, and the results of a recent analytical assessment of fish stocks are used to estimate potential future values based on maximum sustainable yields. In the Black Sea region, despite long-standing attempts to improve fisheries management, there remains a lack of effective regional cooperation. Evidence from the scenario analysis suggests that achieving GEnS would not have an undue negative impact on overall fishery sector incomes, and could, with appropriate investments in processing and marketing, deliver increased economic benefits for Black Sea countries. The ongoing policy debate between and within Black Sea coastal states needs to be extended to include recognition of the potential economic and social benefits of effective fisheries management. More work is required to assess returns on investment in interim management measures to deliver GEnS.

  18. Sharing values, sharing a vision

    Energy Technology Data Exchange (ETDEWEB)

    1993-12-31

    Teamwork, partnership and shared values emerged as recurring themes at the Third Technology Transfer/Communications Conference. The program drew about 100 participants who sat through a packed two days to find ways for their laboratories and facilities to better help American business and the economy. Co-hosts were the Lawrence Livermore National Laboratory and the Lawrence Berkeley Laboratory, where most meetings took place. The conference followed traditions established at the First Technology Transfer/Communications Conference, conceived of and hosted by the Pacific Northwest Laboratory in May 1992 in Richmond, Washington, and the second conference, hosted by the National Renewable Energy Laboratory in January 1993 in Golden, Colorado. As at the other conferences, participants at the third session represented the fields of technology transfer, public affairs and communications. They came from Department of Energy headquarters and DOE offices, laboratories and production facilities. Continued in this report are keynote address; panel discussion; workshops; and presentations in technology transfer.

  19. Effects of Water Pollution on the Condition Factor, Mortality, Exploitation Ratio and Catch per Unit Effort of Lagocephalus laevigatus in Koluama Area, Niger Delta Area, Nigeria

    Directory of Open Access Journals (Sweden)

    E.N. Ogamba

    2012-11-01

    Full Text Available Effects of water pollution on the condition factor, mortality, exploitation ratio and catch per unit effort of Lagocephalus laevigatus in Koluama Area, Niger Delta Area, Nigeria was investigated from April 2012 to May 2012; following an oil blow out in the area. To show the impact of the spill on the environment, catch rates are seasonally dependent and vary between 15-120 kg/day. About 120 wooden canoes were sighted in the communities studied. The canoes are basically in two categories namely, small sized boats of less than 5 m length and medium-sized ones ranging between 5 and 7 m long. There was no temporal variation in the condition of the fish with condition index value ranging from 0.86-1.00 and condition factor value of 0.98. The K value of 0.98 estimated from this study shows that Lagocephalus laevigatus from the study area was in extremely poor condition. Total mortality (Z value was 1.5 yrG1. Natural Mortality (M value was 0.97; Fishing mortality (F value was 0.52. Value for the rate of exploitation was 0.35 with corresponding percentage value of 35%. The result shows that Lagocephalus laevigatus with an exploitation rate of 0.35 is below the optimal value for sustainable yield, for the exploitation of the fishery. These populations therefore stand the risk of under exploitation if urgent measures are not taken to develop the fishery.

  20. Shared Memories?

    DEFF Research Database (Denmark)

    Wæhrens, Anne

    2011-01-01

    This paper analyses how the memory of the Holocaust has been addressed in the European Parliament from 1989 to 2009. I identify two major changes that occurred in the 1990s and after the 2004 enlargement of the European Union respectively. In the 1990s the war in Bosnia and the question of restit......This paper analyses how the memory of the Holocaust has been addressed in the European Parliament from 1989 to 2009. I identify two major changes that occurred in the 1990s and after the 2004 enlargement of the European Union respectively. In the 1990s the war in Bosnia and the question...... of restitution universalised the memory of the Holocaust and made it present. The 2004 enlargement brought the memory of Soviet Communism into the Union and made it a central task to construct a community of memory that includes both the memory of the Holocaust and of Soviet Communism. The analysis also...... identifies what seems to be a political memory split between Left and Right; and it shows that the time might not be ripe for a shared European memory....