1993 ICES coordinated acoustic survey of ICES Division IVa, IVb and VIa
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http://hdl.handle.net/11250/105313Utgivelsesdato
1994Metadata
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This report is not to be cited without prior reference to the authorsSammendrag
Summary: This paper provides a report on the combined acoustic survey of herring stocks in the
North Sea and ICES division IVaN in June-July 1993. The surveys were carried out by
Norway, Scotland, Denmark and Netherlands and covered the period 29 June to 30 July.
The results and distributions of herring by age are given for area by 30 Nmile statistical
rectangles. The results are expressed in biomass and numbers of fish. In addition data
on ichthyophonus infection rates determined from trawl samples obtained on the survey
are reported and the infected numbers and proportions of the population are estimated.
A discussion of errors in the estimation of abundance is included in the report.