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JNAFS

31

Stein Tveite

Institute of Marine Research, Flødevigen Marine Research Station
N-4817 His, Norway

Source - Journal of Northwest Atlantic Fishery Science, Volume 27: 177-182
ISSN-0250-6408

Abstract

Since 1984, an annual fixed station survey for northern shrimp (Pandalus borealis) has been conducted during October-November within the Skagerrak and Norwegian Deeps. Abundance trends from this survey are similar to trends from Extended Survivor Analysis and landings per unit of effort statistics, consequently the survey should be useful for assessment and management purposes, including determination of year-class strengths. While 0-group survey catch indices did give an early indication of year-class strength, I-group indices were more reliable for this purpose. Trends in shrimp abundance indices and other survey data including growth and time of sex reversal were positively correlated to environmental factors, including yearly averages of deep water temperatures, and the volume of Atlantic water flowing into the area. Consequently, the fixed station shrimp survey results should also be useful for investigations into the causes of changes in shrimp population dynamics in the Skagerrak-Norwegian Deeps area.

Language - English Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - December 2000
Publication Type - Journal Article
Posted in: Volume 27 - 2000
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