Indication of high natural mortality for juvenile herring from acoustic and tagging data.
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Original versionThis report is not to be quoted without prior consultation with the General Secretary.
Natural mortality for juvenile herring (Norwegian Spring spawners) is discussed on the basis of following data: 1. Acoustic estimates of the 1975 and 1976 yearclasses of herring as 0-group and estimates from tagging data of these yearclasses as 4 year old fish. 2. Acoustic abundance estimates of the 1978 herring yearclass in Lavangen fjord, Northern Norway. These data indicate a high natural mortality for juvenile herring.