Indication of high natural mortality for juvenile herring from acoustic and tagging data.
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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.