Time-series data for a selection of forty fish species caught during the International Bottom Trawl Survey
Heessen, H.J.L. (1996). Time-series data for a selection of forty fish species caught during the International Bottom Trawl Survey. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 53: 1079–1084
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289, more
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| Keywords |
20th century
Catch per unit effort
Fisheries
Sharks
Taxa > Species > Commercial species
Time series
Pisces [WoRMS]
ANE, North Sea [Marine Regions]
Marine/Coastal; Brackish water |
| Author keywords |
fish, long-term trends, North Sea, trawl survey |
| Abstract |
Relative abundance estimates of 40 fish species caught during the ICES coordinated International Bottom Trawl Survey are presented for the period 1970–1993. Trends in survey catches for eight commercial species are compared with total stock biomass estimates derived from stock assessment. In general, there is a remarkably good correspondence between these two independent parameters, suggesting that the survey is capable of registering significant changes in abundance. Among the 40 species, there are many more showing a positive trend during recent years than a negative one. However, the commercial species are all either declining or are stable. The most significant changes are observed in ‘‘southern’’ species, which is probably related to a period of relatively warm winters after 1990. In many resident species, however, that appear to be increasing over a prolonged period of time, this explanation does not seem to apply. |
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