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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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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, meer

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Beschikbaar in	Auteur
VLIZ: Open access 257439 [ download pdf ]

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Trefwoorden

20th century Catch per unit effort Fisheries Sharks Taxa > Species > Commercial species Time series Pisces [WoRMS] ANE, Noordzee [Marine Regions] Marien/Kust; Brak water

Author keywords

fish, long-term trends, North Sea, trawl survey

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Auteur		Top
Heessen, H.J.L., meer

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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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