Distribution and abundance of 0-group Norway pout and haddock in the North Sea july - august 1978
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Original versionThis report is not to be quoted without prior consultation with the General Secretary.
In order to assess the 0-group abundance of Norway pout and haddock in the North Sea a combined acoustic/trawl survey was carried out in July - August 1978. The 0-group of both species were concentrated in a scattering layer between surface and 40 m depth during the night. During the day all the 0-group Norway pout and most of the 0-group haddock were found in the vicinity of the bottom but a minor portion of the 0-group haddock occurred in scattered schools throughout the entire water column. Acoustic estimates of the 0-group stocks of the two species amounted to 165 * 10^9 specimens of Norway pout and 23 * 10^9 specimens of haddock. The figure for Norway pout compares resonably well with estimates based on independent data, but regarding the haddock the acoustic estimate seems high compared with estimates based on other data sources.
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