Download or read book Average Density Index for Walleye Pollock Theragra Chalcogramma in the Bering Sea written by Loh Lee Low and published by . This book was released on 1980 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Average Density Index for Walleye Pollock Theragra Chalcogramma in the Bering Sea Classic Reprint written by Loh-Lee Low and published by Forgotten Books. This book was released on 2018-03-02 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Average Density Index for Walleye Pollock, Theragra Chalcogramma, in the Bering Sea The application of this procedure for walleye pollock involved some selection of catch-effort data from pair trawlers which they determined to be the most consistent gear type directed to pollock fishing activities in each statistical block. Statistical blocks used in the calcula tions were those where the daily pollock catch was greater than that of any other species. From these selected pollock-majority catch-effort data an adi was computed for an area made up of several statistical blocks. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Download or read book Average Density Index For Walleye Pollock Theragra Chalcogramma in the Bering Sea written by Loh-Lee Low and published by . This book was released on 1980 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NOAA Technical Report NMFS SSRF written by and published by . This book was released on 1971 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book History of the Fishery and Summary Statistics of the Sockeye Salmon Oncorhynchus Nerka Runs to the Chignik Lakes Alaska 1888 1966 written by Michael L. Dahlberg and published by . This book was released on 1979 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book NOAA Technical Report NMFS written by and published by . This book was released on 1984 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Walleye Pollock Theragra Chalcogramma Distribution in the Eastern Bering Sea Related to Fishery and Environmental Factors written by Haixue Shen and published by . This book was released on 2009 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Walleye pollock (Theragra chalcogramma) in the eastern Bering Sea (EBS) support the largest single-species fishery in the world. Pollock also play an important role in the EBS ecosystem as an important prey species. The decline of the western population of Steller sea lions during the 1980s and 1990s raised concerns about the potential competition between the pollock fishery and the sea lion population. My research focused on pollock distribution related to the fishery and physical environment at different temporal and spatial scales using fisheries acoustic data and observer data in the winter fishing season during 2002-2006. Temperature and wind played important roles in determining the pollock distribution in winter, especially from late February to March. The changes in spatial structure during the fishing season suggested that the fishery probably influenced pollock distribution by removing some portion of the local population and perhaps even smoothing out the aggregated distribution of pollock. At a small scale, pollock schools became smaller and denser. At the meso-scale, the distances between schools increased. At a larger scale, range estimates from variography increased which indicated that the spatial correlation among pollock extended to greater distances after fishing. Fishing behavior was also studied using Levy flight theory and its relation to pollock distribution in the EBS. Fishing behavior was significantly correlated to the fractal dimension of fish which measures the degree of pollock clustering, rather than to pollock spatial concentration or density in the EBS. The observer data were also included to analyze the effect of fish distribution on fishing behavior at the school scale. The results indicated that school density rather than the school size played an important role in fishing behavior. Finally, catch depletion analysis was used to examine the potential local depletion. While frequentist and Bayesian methods confirmed that the fishery caused slight local depletion in some areas in the EBS, the magnitude was less than that before sea lion protection measures were put into place in 1999 to spread out the fishery in space and time"--Leaf iii.

Download or read book Bulletin International North Pacific Fisheries Commission written by International North Pacific Fisheries Commission and published by . This book was released on 1983 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book The Eastern Bering Sea Shelf written by Donald Wilbur Hood and published by . This book was released on 1980 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Download or read book Maturation of Walleye Pollock Theragra Chalcogramma in the Eastern Bering Sea in Relation to Temporal and Spatial Factors written by Jennifer Paige Stahl and published by . This book was released on 2004 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Walleye pollock, Theragra chalcogramma, are both ecologically and commercially important in the eastern Bering Sea (EBS). Maturity is a critical parameter in the stock assessment to set annual total allowable catch. Pollock maturity has not been examined in the EBS since 1976, and possible interannual and geographic variation has not been studied to date. Our goal is to estimate correct maturity schedules for EBS pollock. Maturity data, fish lengths and macroscopic maturity stages were collected aboard pollock trawlers during winter 2002 and 2003 across the EBS from 10,197 pollock. Similar data were collected by NMFS scientists during hydroacoustic surveys from 1989-2002. Histological analysis of ovary tissue confirmed the appropriateness of macroscopic staging. However, some pollock classified macroscopically as 'developing' may mature either in the current or following spawning seasons. Therefore, our analysis was performed with two alternative assumptions: fish classified as 'developing' were either considered immature or mature. Maturity rates were estimated by logistic regression. Geographic variability exists; fish mature at the smallest lengths north of the Pribilof Islands. Size at maturity varies interannually, as well. Temporal and spatial variation in maturity may be due to biological or environmental factors, such as pollock density, water temperature, or prey availability"--Leaf iii.