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Effects Of Modifications To Cod Fishing Pots On Catch Rates Of Pacific Cod Gadus Macrocephalus
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Book Synopsis Effects of Modifications to Cod-fishing Pots on Catch Rates of Pacific Cod (Gadus Macrocephalus) by : Leslie J. Watson
Download or read book Effects of Modifications to Cod-fishing Pots on Catch Rates of Pacific Cod (Gadus Macrocephalus) written by Leslie J. Watson and published by . This book was released on 1998 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Modifications to Cod-fishing Pots on Catch Rates of Pacific Cod,(Gadus Macrocephalus, March 1999 Study by : Leslie J. Watson
Download or read book Effects of Modifications to Cod-fishing Pots on Catch Rates of Pacific Cod,(Gadus Macrocephalus, March 1999 Study written by Leslie J. Watson and published by . This book was released on 1999 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study to Test the Effectiveness of Modifications to Cod-fishing Pots in Reducing Catch Rates for Tanner Crab (Chionoecetes Bairdi) and Maintaining Catch Rates for Pacific Cod (Gadus Macrocephalus) by : Leslie J. Watson
Download or read book A Study to Test the Effectiveness of Modifications to Cod-fishing Pots in Reducing Catch Rates for Tanner Crab (Chionoecetes Bairdi) and Maintaining Catch Rates for Pacific Cod (Gadus Macrocephalus) written by Leslie J. Watson and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Promoting Conservation Through the Improvement of Cod Pots - a Low Impact Fishing Gear and Alternative Harvesting Strategy for Atlantic Cod (Gadus Morhua) in Newfoundland and Labrador by : Phillip Meintzer
Download or read book Promoting Conservation Through the Improvement of Cod Pots - a Low Impact Fishing Gear and Alternative Harvesting Strategy for Atlantic Cod (Gadus Morhua) in Newfoundland and Labrador written by Phillip Meintzer and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pots are baited fishing gears that are growing in use as a tool for harvesting Atlantic cod (Gadus morhua) in Newfoundland and Labrador (NL). To study how cod behaviours affect pot efficiency, I used underwater video cameras to assess two models of pot deployed in the Fogo Island fishery. Cod made few entry attempts relative to the number of approaches, and only 22% of entry attempts were successful. The majority of approaches, entry attempts, and successful entrances occurred from the down-current direction, and 25% of cod were able to escape following capture. Following video analysis, I made modifications to existing pots, and created a new design. I then collected catch and length data, across five models of pot, over two years, to determine the optimal design for a re-emergent cod fishery in NL. All five pots caught cod effectively, but the new and modified pots caught the most per deployment, and increasing mesh size was effective at reducing the number of undersized fish caught. This thesis demonstrates that modifications can have a substantial impact on catch rates, that potting gear is fundamentally sound, and fishermen can select a pot that is most appropriate to their needs.
Book Synopsis Spatial and Temporal Distribution and Relative Abundance of Pacific Cod (Gadus Macrocephalus) Larvae in the Western Gulf of Alaska by : William C. Rugen
Download or read book Spatial and Temporal Distribution and Relative Abundance of Pacific Cod (Gadus Macrocephalus) Larvae in the Western Gulf of Alaska written by William C. Rugen and published by . This book was released on 1988 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pacific Cod Community Development Quota Fishery Development for Amendment 109 to the Fishery Management Plan for Groundfish of the Bering Sea and Aleutian Islands Management Area by : Sarah Marrinan
Download or read book Pacific Cod Community Development Quota Fishery Development for Amendment 109 to the Fishery Management Plan for Groundfish of the Bering Sea and Aleutian Islands Management Area written by Sarah Marrinan and published by . This book was released on 2016 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Regulatory Impact Review/Environmental Assessment analyzes proposed management measures that would apply exclusively to Community Development Quota (CDQ) groups and their participants. The measures under consideration include easing or exempting certain regulatory requirements for hook-and-line catcher vessels that do not exceed 46 feet length overall, in order to promote harvest opportunities for groundfish CDQ, in particular, Pacific cod (Gadus macrocephalus) CDQ, by small vessels in a directed fishery and/or while fishing CDQ or Individual Fishing Quota Pacific halibut (Hippoglossus stenolepis). The preferred alternative removes the requirement for the operators of these small catcher vessels to obtain and carry a License Limitation Program license, requires registration of vessels fishing under these regulations, reduces observer coverage requirements, and implements new catch accounting requirements to properly account for the harvest of groundfish and halibut and the accrual of halibut prohibited species catch (PSC).
Book Synopsis Regulatory Impact/initial Flexibility Analysis of Proposed Inshore/offshore Allocation Alternatives, Amendment 18/23 to Groundfish, Bering Sea and Aleutian Islands Fisheries Management Plan (FMP) and Gulf of Alaska Groundfish Fisheries Management Plan (FMP) by :
Download or read book Regulatory Impact/initial Flexibility Analysis of Proposed Inshore/offshore Allocation Alternatives, Amendment 18/23 to Groundfish, Bering Sea and Aleutian Islands Fisheries Management Plan (FMP) and Gulf of Alaska Groundfish Fisheries Management Plan (FMP) written by and published by . This book was released on 1992 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interrelationship Among Temperature, Metabolism, Swimming Performance and Recovery in Pacific Cod (Gadus Macrocephalus) by : Shannon K. Hanna
Download or read book Interrelationship Among Temperature, Metabolism, Swimming Performance and Recovery in Pacific Cod (Gadus Macrocephalus) written by Shannon K. Hanna and published by . This book was released on 2006 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Physiological constraints are suggested to contribute to the observed changes in relative abundance of Pacific cod (Gadus macrocephalus) seen in association with interdecadal changes in sea surface temperatures. To examine this concept, two experiments were conducted to determine critical swimming speed (Ucrit), rates of oxygen consumption and recovery post-exhaustion of adult cod acclimated to different temperatures. In addition, hematocrit and plasma concentrations of cortisol, metabolites and ions from resting and exhausted fish were measured to assess the impact of swim trials on fish condition. In experiment one, fish acclimated to 4°C had similar mean Ucrit (1.07 BL/s) and resting metabolic rates (35.34 mg O2/kg08/hr) compared to fish acclimated to 11°C fish (1.07 BL/s; 49.43 mg O2/kg08/hr). Similarly, concentrations of blood constituents differed little between temperature treatments; each exhibited increases in plasma cortisol and metabolites from pre- to post-swim. Experiment two illustrated few differences in rates of recovery between temperature groups (2 and 7°C). After four hours of recovery there was no evidence of plasma cortisol or metabolites returning to pre-swim concentrations in either temperature group. It seems unlikely that physiological constraints on the metabolic performance of adult Pacific cod contribute to changes in their relative abundance"--Leaf iii.
Book Synopsis Natal Source Contributions of Pacific Cod (Gadus Macrocephalus) Recruits in the Southeastern Bering Sea by : Ruth A. DiMaria
Download or read book Natal Source Contributions of Pacific Cod (Gadus Macrocephalus) Recruits in the Southeastern Bering Sea written by Ruth A. DiMaria and published by . This book was released on 2011 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective and sustainable fisheries management not only depends on identifying and defining stocks (fundamental unit of management), but also on having knowledge of factors influencing the abundance, distribution and connectivity of stocks. Population structure of Pacific cod (Gadus macrocephalus) in the southeastern Bering Sea (EBS) remains unresolved although genetic data indicate isolation-by-distance throughout the species range across the North Pacific Ocean. Pacific cod are fished on their spawning grounds, therefore, it is important to evaluate whether particular spawning sources are more critical than others in sustaining the productivity of fished populations. Chemical analysis of otoliths can provide information on mixing among groups of fish on ecological time scales and at finer spatial scales than genetic analyses. Therefore, I completed laboratory and field research on the otolith elemental composition of larval and juvenile cod to: (1) investigate temperature and growth-rate effects on otolith elemental incorporation to aid interpretations of field data; (2) evaluate the potential to detect larval exchange between the Gulf of Alaska (GOA) and the EBS; (3) quantify spatial scales at which there was significant variation in otolith elemental composition; and (4) quantify the number of larval sources (chemically distinct groups) contributing to juvenile recruits in the EBS. In the laboratory study, I observed higher rates of incorporation at lower temperatures for both Sr and Ba but similar ranges of Mg incorporation at 2°C, 6°C and 8°C. There was no significant effect of somatic growth or otolith precipitation rate on elemental incorporation detected, indicating that variation in individual growth rates should not confound interpretations of field data. In two years of field collections (2006 & 2008), otolith elemental signatures (Mg:Ca, Mn:Ca, Zn:Ca, Sr:Ca, and Ba:Ca) differed between larvae collected in the EBS and GOA, and over 70% of the larvae were correctly classified to source. Furthermore, I examined the chemical signatures of the otolith edge (representing approximately the last 10 d of life) for juveniles collected at six locations throughout the EBS. Seventy-nine and 71% of the juveniles were correctly classified to their collection location in 2006 and 2008, respectively. These results demonstrate that there is sufficient spatial variation in otolith composition to examine spatial structure in Pacific cod within the EBS and to identify GOA larval contribution to the EBS population. Finally, larval source signatures, represented by otolith core chemistry, of juveniles collected throughout the EBS were classified into chemically distinct groups using hierarchical cluster analysis. In both years we identified two dominant sources representing 56% and 30% of the cohort in 2006, and 53% and 40% in 2008. Most collection sites contained a mixture of larval sources although one or two sites per year were comprised of a single source. These chemically unique sources likely represent different spawning locations with distinct environmental characteristics, although the exact locations are unknown. These sources potentially represent contributions from known spawning areas, which include the Alaskan Peninsula, Aleutian Islands, and Pribilof Islands. Our results highlight the potential of otolith chemical analyses to identify source contributions of Pacific cod in the EBS but larval collections throughout the spawning season are needed to provide additional detail on the spatial distribution of those sources.
Book Synopsis Alaska Fishery Research Bulletin by :
Download or read book Alaska Fishery Research Bulletin written by and published by . This book was released on 1994 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2021 by : Asia Beder
Download or read book Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2021 written by Asia Beder and published by . This book was released on 2020 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dutch Harbor Subdistrict (DHS) state-waters Pacific cod Gadus macrocephalus season is prosecuted in state waters of the Aleutian Islands District east of 170°W long and state waters of the Bering Sea District west of 162°30′W long and south of 55°30′N lat, and is closed to fishing south of 53°06.11′N lat. Legal gear for the state-waters season includes pot and mechanical jig. The 2021 guideline harvest level season for pot gear is 27,292,000 pounds, which is 10% of the estimated Pacific cod acceptable biological catch for the federal Bering Sea Subarea. The guideline harvest level for mechanical jigging machines is 100,000 pounds. The Alaska Department of Fish and Game also manages a parallel Pacific cod season in the Dutch Harbor Subdistrict concurrent with adjacent federal Pacific cod seasons, except where a state-waters Pacific cod season is open. Harvest in the parallel season accrues toward the federal Pacific cod total allowable catch.
Download or read book Ecology Abstracts written by and published by . This book was released on 1998 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.
Book Synopsis Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2023 by : Asia Beder
Download or read book Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2023 written by Asia Beder and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dutch Harbor Subdistrict (DHS) state-waters Pacific cod Gadus macrocephalus season is prosecuted in state waters of the Aleutian Islands District east of 170°W long and state waters of the Bering Sea District west of 162°30′W long and south of 55°30′N lat. and is closed to fishing south of 53°06.11′N lat. Legal gear for the state-waters seasons includes pot and mechanical jigging machine. The 2023 season guideline harvest level for pot gear is 38,316,000 pounds, which is 12% of the estimated Pacific cod acceptable biological catch for the federal Bering Sea Subarea. The 2023 season guideline harvest level for mechanical jigging machines is 100,000 pounds.The Alaska Department of Fish and Game also manages a parallel Pacific cod season in the Dutch Harbor Subdistrict concurrent with adjacent federal Pacific cod seasons, except where a state-waters Pacific cod season is open. Harvest in the parallel season accrues toward the federal Pacific cod total allowable catch.
Book Synopsis The European Landing Obligation by : Sven Sebastian Uhlmann
Download or read book The European Landing Obligation written by Sven Sebastian Uhlmann and published by Springer. This book was released on 2018-12-19 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book provides a comprehensive examination of the European Landing Obligation policy from many relevant perspectives. It includes evaluations of its impacts at economical, socio-cultural, ecological and institutional levels. It also discusses the feasibility and benefits of several potential mitigation strategies. The book was timely published, exactly at the time where the Landing Obligation was planned to be fully implemented. This book is of significant interest to all stakeholders involved, but also to the general public of Europe and to other jurisdictions throughout the world that are also searching for ways to deal with by-catch and discard issues.
Book Synopsis Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2022 by : Asia Beder
Download or read book Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2022 written by Asia Beder and published by . This book was released on 2021 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dutch Harbor Subdistrict (DHS) state-waters Pacific cod Gadus macrocephalus season is prosecuted in state waters of the Aleutian Islands District east of 170°W long and state waters of the Bering Sea District west of 162°30'W long and south of 55°30'N lat, and is closed to fishing south of 53°06.11'N lat. Legal gear for the state-waters season includes pot and mechanical jig. The 2022 guideline harvest level season for pot gear is 37,196,000 pounds, which is 11% of the estimated Pacific cod acceptable biological catch for the federal Bering Sea Subarea. The guideline harvest level for mechanical jigging machines is 100,000 pounds. The Alaska Department of Fish and Game also manages a parallel Pacific cod season in the Dutch Harbor Subdistrict concurrent with adjacent federal Pacific cod seasons, except where a state-waters Pacific cod season is open. Harvest in the parallel season accrues toward the federal Pacific cod total allowable catch.
Book Synopsis Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2019 by : Asia Beder
Download or read book Fishery Management Plan for the Dutch Harbor Subdistrict State-waters and Parallel Pacific Cod Seasons, 2019 written by Asia Beder and published by . This book was released on 2018 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dutch Harbor Subdistrict (DHS) state-waters Pacific cod Gadus macrocephalus season is prosecuted in state waters of the Aleutian Islands District east of 170° W long. and state waters of the Bering Sea District west of 162° 30' W long. and south of 55° 30' N lat., and is closed to fishing south of 53° 06.11' N lat. The 2019 DHS state-waters Pacific cod season for pot gear will open 7 days after closure of the initial federal Bering Sea and Aleutian Islands Pacific cod season for hook-and-line and pot catcher vessels less than 60 feet in overall length (OAL). The season for vessels using mechanical jigging machines opens on May 1. Vessels participating in the state-waters Pacific cod season may not exceed 58 feet OAL and may only use groundfish pot gear or mechanical jigging machines. The guideline harvest level for the 2019 DHS state-waters Pacific cod season for pot gear is 8% of the estimated Pacific cod acceptable biological catch for the federal Bering Sea Subarea. The guideline harvest level for mechanical jigging machines is 100,000 pounds.
Book Synopsis Handbook of Fish Biology and Fisheries by : Paul J. B. Hart
Download or read book Handbook of Fish Biology and Fisheries written by Paul J. B. Hart and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent decades have witnessed strong declines in fish stocks around the globe, amid growing concerns about the impact of fisheries on marine and freshwater biodiversity. Fisheries biologists and managers are therefore increasingly asking about aspects of ecology, behaviour, evolution and biodiversity that were traditionally studied by people working in very separate fields. This has highlighted the need to work more closely together, in order to help ensure future success both in management and conservation. The Handbook of Fish Biology and Fisheries has been written by an international team of scientists and practitioners, to provide an overview of the biology of freshwater and marine fish species together with the science that supports fisheries management and conservation. This volume, subtitled Fisheries, focuses on a wide range of topics, including the history of fisheries science, methods of capture, marketing, economics, major models used in stock assessments and forecasting, ecosystem impacts, marine protected areas and conservation. It builds on material in Volume 1, Fish Biology, which ranges from phylogenetics and biogeography to physiology, recruitment, life histories, genetics, foraging, reproductive behaviour and community ecology. Together, these books present the state of the art in our understanding of fish biology and fisheries and will serve as valuable references for undergraduates and graduates looking for a comprehensive source on a wide variety of topics in fisheries science. They will also be useful to researchers who need up-to-date reviews of topics that impinge on their fields, and decision makers who need to appreciate the scientific background for management and conservation of aquatic ecosystems. To order volume II, go to the box in the top right hand corner. Alternatively to order volume I, go to: http://www.blackwellpublishing.com/book.asp?ref=0632054123 or to order the 2 volume set, go to: http://www.blackwellpublishing.com/book.asp?ref=0632064838. Provides a unique overview of the study of fish biology and ecology, and the assessment and management of fish populations and ecosystems. The first volume concentrates on aspects of fish biology and ecology, both at the individual and population levels, whilst the second volume addresses the assessment and management of fish populations and ecosystems. Written by an international team of expert scientists and practitioners. An invaluable reference tool for both students, researchers and practitioners working in the fields of fish biology and fisheries.
