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 Changes in Commercial Catch Sampling and Age Determination Procedures for Pacific Halibut Fishery written by Heather L. Gilroy and published by . This book was released on 1995 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Changes in Commercial Catch Sampling and Age Determination Procedures for Pacific Halibut 1982 to 1992 written by Heather L. Gilroy and published by . This book was released on 1995 with total page 44 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 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 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 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 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 Changes in Commercial Catch Sampling for Pacific Halibut 1994 to 2009 written by Lara M. Erikson and published by . This book was released on 2011 with total page 36 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 Scientific Report written by International Pacific Halibut Commission and published by . This book was released on 1999 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Sampling the Commercial Catch and Use of Calculated Lengths in Stock Composition Studies of Pacific Halibut written by Hardman, William H and published by Seattle, Wash. : International Pacific Halibut Commission. This book was released on 1965 with total page 32 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 A Review of IPHC Catch Sampling for Age and Size Composition from 1935 Through 1999 Including Estimates for the Years 1963 1990 written by William G. Clark and published by . This book was released on 2000 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sampling Pacific Halibut Hippoglossus Stenolepis Landings for Age Composition written by Terrance J. Quinn and published by . This book was released on 1983 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Climate Change and Northern Fish Populations written by National Research Council Canada and published by NRC Research Press. This book was released on 1995 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: These documents summarize some of the recent studies of the relationships among climate, the aquatic environment, and the dynamics of fish populations. The studies are mostly from the North Pacific ocean, but there are reports of investigations from the North Atlatic Ocean and from fresh water. Various papers include numerous examples of the relationships between fish abundance trends and the environment.