Norwegian tagging experiments in the north-eastern North Sea and Skagerak, 1964 and 1965

Abstract

1. Norwegian herring tagging experiments carried out with internal metal tags in Skagerak in 1964 and 1965 are described. 2. The returns from these taggings up to 31 October 1966 are reviewed and factors affecting the losses of tags discussed. 3. Evidence for a movement of herring from Skagerak towards the Egersund Bank-Coral Bank area and further westward to the Shetland area was found. 4. Quantitative treatment of the recaptures from Norwegian reduction plants equipped with magnets are dealt with and, tentative estimates for the stock size in the Skagerak-Egersund Bank-Coral Bank areas during the period November 1965-May 1966 are given.