Download or read book Changes in Commercial Catch Sampling and Age Determination Procedures for Pacific Halibut 1982 to 1993 written by Heather L. Gilroy and published by . This book was released on 1995 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Pacific Halibut Commission has sampled the commercial catch since the 1930s. Documentation for the years 1982 to 1993 of port coverage, logbook data collected, sampling methods, otolith sample size, the processing of otoliths in the lab, and otolith-related studies are presented in this report. Sampling ports were added as the pattern of landings shifted. Logbook data forms changed to reflect the use of more than one gear type per vessel and the use of non-halibut gear. Also initiated was the collection of information on gear lost or abandoned during the ever shortening openings. Length/age sampling within a port was changed from representing a port proportionally, to representing a vessel's hailed weight proportionally. This change was made in response to the shorter, higher volume unloading periods and was accomplished by changing from systematic sampling of slings (cargo nets) of fish to unbiased random sampling of fish. The total otolith sample size was reduced and sample sizes were set for each management area. Double blind aging was discontinued. Otolith studies relating to glycerin absorption, age validation using oxytetracycline, automated aging, and the use of otoliths to determine sex were undertaken.

Download or read book Technical Report written by and published by . This book was released on 2000 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Report International Pacific Halibut Commission written by and published by . This book was released on 1995 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific Report International Pacific Halibut Commission written by International Pacific Halibut Commission (United States and Canada). and published by . This book was released on 1983 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pacific Halibut Bycatch in the Groundfish Fisheries written by Patrick J. Sullivan and published by Seattle, Wash. : International Pacific Halibut Commission. This book was released on 1994 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report International Pacific Halibut Commission written by International Pacific Halibut Commission and published by . This book was released on 2011 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Scientific Report written by International Pacific Halibut Commission and published by . This book was released on 2006 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report written by International Pacific Halibut Commission and published by . This book was released on 2009 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fishery Bulletin written by and published by . This book was released on 2012 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NOAA Technical Report NMFS written by and published by . This book was released on 1984 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sustaining Marine Fisheries written by National Research Council and published by National Academies Press. This book was released on 1999-03-19 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluctuations and declines in marine fish populations have caused growing concern among marine scientists, fisheries managers, commercial and recreational fishers, and the public. Sustaining Marine Fisheries explores the nature of marine ecosystems and the complex interacting factors that shape their productivity. The book documents the condition of marine fisheries today, highlighting species and geographic areas that are under particular stress. Challenges to achieving sustainability are discussed, and shortcomings of existing fisheries management and regulation are examined. The volume calls for fisheries management to adopt a broader ecosystem perspective that encompasses all relevant environmental and human influences. Sustaining Marine Fisheries offers new approaches to building workable fisheries management institutions, improving scientific data, and developing management tools. The book recommends ways to change current practices that encourage overexploitation of fish resources. It will be of special interest to marine policymakers and ecologists, fisheries regulators and managers, fisheries scientists and marine ecologists, fishers, and concerned individuals.

Download or read book Oceanic Abstracts written by and published by . This book was released on 1997 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Washington State University Conference on Biomathematics and Biostatistics May 1 2 1974 written by and published by . This book was released on 1974 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gulf of Alaska and Bering Sea Aleutian Islands Proposed Individual Fishing Quota Management Alternatives for Halibut Fisheries written by and published by . This book was released on 1991 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Commercial Fisheries Abstracts written by and published by . This book was released on 1965 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report of the International Pacific Halibut Commission written by and published by . This book was released on 1968 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: