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Author :
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (946 download)
Download or read book Assessment of Groundfish Stocks Based on Bottom Trawl Survey Results written by and published by . This book was released on 1996 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Northwest Atlantic Fisheries Organization
Publisher :
ISBN 13 :
Total Pages : 105 pages
Book Rating : 4.:/5 (191 download)
Download or read book Assessment of Groundfish Stocks Based on Bottom Trawl Survey Results written by Northwest Atlantic Fisheries Organization and published by . This book was released on 1996 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Amaratunga
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (476 download)
Download or read book Workbook written by T. Amaratunga and published by . This book was released on 1996 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. General Accounting Office
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.E/5 ( download)
Download or read book Pacific Groundfish written by United States. General Accounting Office and published by . This book was released on 2004 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309174139
Total Pages : 136 pages
Book Rating : 4.3/5 (91 download)
Download or read book Review of Northeast Fishery Stock Assessments written by National Research Council and published by National Academies Press. This book was released on 1998-04-17 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The collapse of cod, flounder, and haddock fish stocks in the Northeast United States has caused widespread concern among managers and fishers in the United States and Canada. The diminishing stocks have forced managers to take strict regulatory measures. Numerous questions have been raised about the adequacy of stock assessment science used to evaluate the status of these stocks and the appropriateness of the management measures taken. Based on these concerns, Congress mandated that a scientific review of the methodology and data used to evaluate these stocks be conducted. In this volume, the committee concludes that although there are improvements to be made in data collection, modeling uncertainty, and communicating between fishers, managers, and scientists, the scientific methods used in the Northeast stock assessments are sound. Recommendations are made on how the stock assessment process can be improved.
Author : Paul J. Starr
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (468 download)
Download or read book Feasibility of a Bottom Trawl Survey for Three Slope Groundfish Species in Canadian Waters written by Paul J. Starr and published by . This book was released on 2000 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Susan E. Wigley
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (318 download)
Download or read book Distribution of Sexually Immature Components of 10 Northwest Atlantic Groundfish Species Based on Northeast Fisheries Center Bottom Trawl Surveys, 1968-86 written by Susan E. Wigley and published by . This book was released on 1991 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nate W. Raring
Publisher :
ISBN 13 :
Total Pages : 219 pages
Book Rating : 4.:/5 (958 download)
Download or read book Data Report written by Nate W. Raring and published by . This book was released on 2016 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists of the Groundfish Assessment Program of Alaska Fisheries Science Center's Resource Assessment and Conservation Engineering (RACE) Division conducted the third biennial groundfish assessment survey of the Gulf of Alaska during the summer of 2003. These surveys extend the series of surveys, previously conducted every 3 years between 1984 and 1999, which constitute the time series used in stock assessments of Gulf of Alaska groundfish resources. The survey area covered the continental shelf and upper continental slope to 700 m in the Gulf of Alaska from Islands of Four Mountains (170° W long.) and continued eastward approximately 2,800 km across the Gulf of Alaska to Dixon Entrance (133° 25' W long.). The survey was conducted aboard three chartered commercial trawlers, the FV Gladiator, the FV Northwest Explorer and the FV Sea Storm. Trawl haul samples were collected successfully at 809 survey stations using standard RACE Division Poly Nor'Eastern high-opening bottom trawl nets with rubber bobbin roller gear. The primary survey objectives were to define the distribution and estimate the relative abundance of the principal groundfish within the survey area and to collect data to estimate biological parameters useful to groundfish researchers and managers including age; growth; length-weight relationships; feeding habits; and size, sex, and age composition. The survey also collected ancillary data requested by other research groups. More than 176 fish and 362 invertebrate species were captured in survey tows. The species highest in total catch abundance (by weight) over the entire survey area were arrowtooth flounder (Atheresthes stomias), Pacific halibut (Hippoglossus stenolepis), Pacific ocean perch (Sebastes alutus), and walleye pollock (Theragra chalcogramma). Survey results are presented including estimates of catch per unit of effort, biomass, population size composition, and lengthweight relationships, as well as charts depicting the distribution of catch for commercially important species encountered during the survey. [doi:10.7289/V5/TM-AFSC-328 (http://dx.doi.org/10.7289/V5/TM-AFSC-328)]
Author :
Publisher :
ISBN 13 :
Total Pages : 846 pages
Book Rating : 4.3/5 (555 download)
Download or read book Groundfish Total Allowable Catch Specifications and Prohibited Species Catch Management Plans for the Groundfish Fishery of the Bering Sea and Aleutian Islands Area and Groundfish of the Gulf of Alaska written by and published by . This book was released on 1998 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen Howard Clark
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (143 download)
Download or read book Application of Bottom-trawl Survey Data to Fish Stock Assessments written by Stephen Howard Clark and published by . This book was released on 1978 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nate W. Raring
Publisher :
ISBN 13 :
Total Pages : 179 pages
Book Rating : 4.:/5 (73 download)
Download or read book Data Report written by Nate W. Raring and published by . This book was released on 2011 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists of the Groundfish Assessment Program of Alaska Fisheries Science Center's Resource Assessment and Conservation Engineering (RACE) Division conducted the second biennial groundfish assessment survey of the Gulf of Alaska during the summer of 2001. These surveys extend the series of surveys, previously conducted every 3 years between 1984 and 1999, which constitute the time series used in stock assessments of Gulf of Alaska groundfish resources. The survey area covered the continental shelf and upper continental slope to 500 m in the Gulf of Alaska from Islands of Four Mountains (170° W long.) to the east end of Prince William Sound (132° 40' W long.). The survey was conducted aboard three chartered commercial trawlers, and the FV Morning Star and the FV Vesteraalen. Trawl haul samples were collected successfully at 489 survey stations using standard RACE Division Poly Nor'Eastern high-opening bottom trawl nets with rubber bobbin roller gear. The primary survey objectives were to define the distribution and estimate the relative abundance of the principal groundfish within the survey area and to collect data to estimate biological parameters useful to groundfish researchers and managers including age, growth, length-weight relationships, feeding habits, and size, sex, and age composition. The survey also collected ancillary data requested by other research groups. More than 138 fish and 304 invertebrate species were captured in survey tows. The species highest in total catch abundance (by weight) over the entire survey area were arrowtooth flounder (Atheresthes stomias), Pacific ocean perch (Sebates alutus), Pacific halibut (Hippoglossus stenolepis) and northern rockfish (Sebastes polyspinis). Survey results are presented including estimates of catch per unit of effort, biomass, population size composition, and length-weight relationships, as well as charts depicting the distribution of catch for commercially important species encountered during the survey.
Author : Robert Russell Lauth
Publisher :
ISBN 13 :
Total Pages : 229 pages
Book Rating : 4.:/5 (43 download)
Download or read book Results of the 2008 Eastern Bering Sea Continental Shelf Bottom Trawl Survey of Groundfish and Invertebrate Resources written by Robert Russell Lauth and published by . This book was released on 2009 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Resource Assessment and Conservation Engineering Division of the Alaska Fisheries Science Center conducts annual bottom trawl surveys to monitor the condition of the demersal fish and crab stocks of the eastern Bering Sea continental shelf. The standard study area encompasses a major portion of the eastern Bering Sea shelf between the 20-m and the 200-m isobaths and from the Alaska Peninsula north to approximately the latitude of St. Matthew Island (60°50'N). In 2008, two chartered trawlers, the 40-m FV Arcturus and the 40-m FV Aldebaran surveyed this area. Demersal populations were sampled by trawling for 30 minutes at stations centered within 37.04 x 37.04 km (20 x 20 nautical mile) grids covering the survey area. At each station, species composition of the catch was determined, and length distributions and age structure samples were collected from ecologically and commercially important species. Three-hundred seventy-five of the 376 standard survey stations were sampled successfully. A total of 83 species of fishes representing 19 families and 54 genera as well as 174 species of invertebrates representing 12 phyla were identified in the catches from the entire survey area. The combined biomass of walleye pollock, yellowfin sole, and rock sole was 8.1 million metric tons (t) which was 75% of the total fish biomass. The biomass of invertebrates was composed primarily of echinoderms (1.6 million t) and crustaceans (0.75 million t). Survey results presented in this report include abundance estimates for fishes and invertebrates, geographic distributions and size composition of principal fish species, and contour plots of surface and bottom temperatures during the survey sampling period. Appendices provide station data, summarized catch data by station, species listings, and detailed analyses of abundance and biological data of the sampled populations.
Author : Nate W. Raring
Publisher :
ISBN 13 :
Total Pages : 233 pages
Book Rating : 4.:/5 (959 download)
Download or read book Data Report written by Nate W. Raring and published by . This book was released on 2016 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth biennial groundfish survey of groundfish and invertebrate resources of the Gulf of Alaska (GOA) was conducted during the summer of 2005 by the National Marine Fisheries Service's (NMFS) Alaska Fisheries Science Center (AFSC). Scientists from the Groundfish Assessment Program of AFSC's Resource Assessment and Conservation Engineering (RACE) Division in Seattle, Washington, were responsible for the survey’s design and operations. The biennial regimen extends the series begun in 1984, previously conducted every 3 years between 1984 and 1999, which have provided a time series of distribution, abundance, and biological characteristics of GOA groundfish resources for the purpose of stock assessment and management. In this report, we document the operations and results of the 2005 GOA bottom trawl survey. Results of routine analyses of distribution, relative abundance, size composition, and biological characteristics are shown for the principal groundfish species in each of the five International North Pacific Fisheries Commission (INPFC) statistical areas in the GOA: Shumagin, Chirikof, Kodiak, Yakutat, and Southeastern. These results provide stock assessment scientists and resource managers the most current information to be used for subsequent stock assessments and fishery evaluations. Only the 2005 survey results are presented and no comparisons are made to the results of previous GOA surveys. [doi:10.7289/V5/TM-AFSC-329 (http://dx.doi.org/10.7289/V5/TM-AFSC-329)]
Author : Nate W. Raring
Publisher :
ISBN 13 :
Total Pages : 231 pages
Book Rating : 4.:/5 (959 download)
Download or read book Data Report written by Nate W. Raring and published by . This book was released on 2016 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists of the Groundfish Assessment Program of Alaska Fisheries Science Center's Resource Assessment and Conservation Engineering (RACE) Division conducted the seventh biennial groundfish assessment survey of the Gulf of Alaska during the summer of 2011. These surveys extend the series of surveys, previously conducted every 3 years between 1984 and 1999, which constitute the time series used in stock assessments of Gulf of Alaska groundfish resources. The survey area covered the continental shelf and upper continental slope to 700 m in the Gulf of Alaska from Islands of Four Mountains (170° W long.) and continued eastward approximately 2,800 km across the Gulf of Alaska to Dixon Entrance (133° 25' W long.). The survey was conducted aboard two chartered commercial trawlers, the FV Ocean Explorer and the FV Sea Storm. Trawl haul samples were successfully collected at 670 survey stations using standard RACE Division Poly Nor'Eastern high-opening bottom trawl nets with rubber bobbin roller gear. The primary survey objectives were to define the distribution and estimate the relative abundance of the principal groundfish within the survey area and to collect data to estimate biological parameters useful to groundfish researchers and managers including age, growth, length-weight relationships, feeding habits, and size, sex, and age composition. The survey also collected ancillary data requested by other research groups. More than 150 fish and 360 invertebrate species were captured in survey tows. The species highest in total catch abundance (by weight) over the entire survey area were arrowtooth flounder (Atheresthes stomias), Pacific ocean perch (Sebastes alutus), Pacific cod (Gadus macrocephalus), and Pacific halibut (Hippoglossus stenolepis). Survey results are presented including estimates of catch per unit of effort, biomass, population size composition, and lengthweight relationships, as well as charts depicting the distribution of catch for commercially important species encountered during the survey. [doi:10.7289/V5/TM-AFSC-330 (http://dx.doi.org/10.7289/V5/TM-AFSC-330)]
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428937781
Total Pages : 53 pages
Book Rating : 4.4/5 (289 download)
Download or read book Pacific groundfish continued efforts needed to improve reliability of stock assessments : report to congressional requesters. written by and published by DIANE Publishing. This book was released on with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309174406
Total Pages : 194 pages
Book Rating : 4.3/5 (91 download)
Download or read book Improving Fish Stock Assessments written by National Research Council and published by National Academies Press. This book was released on 1998-02-27 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean harvests have plateaued worldwide and many important commercial stocks have been depleted. This has caused great concern among scientists, fishery managers, the fishing community, and the public. This book evaluates the major models used for estimating the size and structure of marine fish populations (stock assessments) and changes in populations over time. It demonstrates how problems that may occur in fisheries dataâ€"for example underreporting or changes in the likelihood that fish can be caught with a given type of gearâ€"can seriously degrade the quality of stock assessments. The volume makes recommendations for means to improve stock assessments and their use in fishery management.
Author : Robert Russell Lauth
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (52 download)
Download or read book Results of the 2009 Eastern Bering Sea Continental Shelf Bottom Trawl Survey of Groundfish and Invertebrate Resources written by Robert Russell Lauth and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Resource Assessment and Conservation Engineering Division of the Alaska Fisheries Science Center conducts annual bottom trawl surveys to monitor the condition of the demersal fish and crab stocks of the eastern Bering Sea continental shelf. The standard study area encompasses a major portion of the eastern Bering Sea shelf between the 20-m and the 200-m isobaths and from the Alaska Peninsula north to approximately the latitude of St. Matthew Island (60°50'N). In 2009, two chartered trawlers, the 40-m FV Arcturus and the 40-m FV Aldebaran, surveyed this area. Demersal populations were sampled by trawling for 30 minutes at stations centered within 37.04 x 37.04 km (20 x 20 nautical mile) grids covering the survey area. At each station, species composition of the catch was determined, and length distributions and age structure samples were collected from ecologically and commercially important species. Three hundred seventy-six standard survey stations were sampled successfully. A total of 94 species of fishes representing 21 families and 62 genera, as well as 168 species of invertebrates representing 13 phyla, were identified in the catches from the entire survey area. The combined biomass of walleye pollock (Theragra chalcogramma), yellowfin sole (Limanda aspera), and rock sole (Lepidopsetta spp.) was 5.6 million metric tons (t) which was 63% of the total fish biomass. The biomass of invertebrates was composed primarily of echinoderms (1.5 million t) and crustaceans (0.71 million t). Survey results presented in this report include abundance estimates for fishes and invertebrates, geographic distributions and size composition of the more common fish species, and contour plots of surface and bottom temperatures during the survey sampling period. Appendices provide station data, summarized catch data by station, species listings, and detailed analyses of abundance and biological data of the sampled populations.
