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Gulf of Maine northern shrimp stock assessment
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1998
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[PDF-1.51 MB]
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Alternative Title:A report prepared by the Atlantic States marine Fisheries Commission's Northern Shrimp Technical Committee at the 25th Northeast Regional Stock Assessment Workshop, Woods Hole, Massachusetts, 21-25 July 1997
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Description:Total biomass of the Gulf of Maine northern shrimp stock is currently below-average, and the fishing mortality rate (F) is relatively high. Trends in stock abundance and F were modeled with abundance indices from research vessel surveys and commercial landings (1985-1996) using a modified DeLury technique. Estimates of biomass and F were independently assessed using a non-equilibrium biomass dynamics model of 1968-1996 landings and survey indices. Abundance of recruited shrimp at the end of the 1996 fishing season was the lowest since the early 1980s. Fishing mortality ranged from 0.1 to 0.5 during 1985-1995 and increased to 0.9 in the 1996 fishing season, the highest level since 1975. There is a 90% probability that F₉₆ exceeded 0.7, the level associated with a stock collapse in the 1970s. Based on a decade of relatively stable stock levels, an appropriate target may be an F of approximately 0.4, which was the average for 1985-1995. An F of 0.4 corresponds to approximately 40% of maxim urn egg production per recruit and is slightly below F₀.₁.
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Content Notes:by Steven X. Cadrin, Daniel F. Schick, David McCarron, Stephen H. Clark, Michael P. Armstrong, Bruce Smith, and J. Brian O'Gorman.
"June 1998."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references.
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Rights Information:Public Domain
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Compliance:Library
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