A preliminary estimate of Atlantic cod (Gadus morhua) biomass in West Greenland offshore waters (NAFO Subarea 1) for 2006 and recent changes in the spatial overlap with northern shrimp (Pandalus borealis)

Kai Wieland, Kaj Sünksen

Research output: Contribution to journalConference articleResearch

Abstract

A comparative study of Atlantic cod catches at West Greenland from the German ground fish survey and the Greenland survey for shrimp and fish was carried out. The analysis was restricted to years with sufficient area coverage and regions included in both surveys. A close correlation between the two surveys estimates of cod biomass was found (r2 = 0.91, P <0.001). Linear regression analysis using data from 14 years revealed that the biomass index of Atlantic cod biomass estimated from the Greenland survey for 2006 would correspond to 22 667 tons in the German survey. This indicates that the biomass of Atlantic cod is still low compared to the 1980s, despite its moderate increase in the most recent years. Furthermore, the geographical distribution of Atlantic cod have become a pronounced southern one, and the impact of Atlantic cod on Northern shrimp through predation appears currently to be small considering the low spatial overlap between the two species.
Original languageEnglish
JournalScientific Council Research Documents NAFO
Volume06/57
Number of pages11
ISSN0256-6915
Publication statusPublished - 2006
Externally publishedYes
EventScientific Council Research Meeting NAFO - , Canada
Duration: 19 Sep 200623 Sep 2006

Conference

ConferenceScientific Council Research Meeting NAFO
CountryCanada
Period19/09/200623/09/2006

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