Blar i Fisken og havet (1958- ) på forfatter "Askeland, Leif H."
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Merkeforsøk med makrell i irske farvann i mai 1976 med F/F "Havdrøn"
Askeland, Leif H.; Revheim, Arne (Fisken og havet, Research report, 1976)During the period 7 May to 11 May a total of 9474 mackerel was tagged off the southwestern coast of Ireland. Internal tags of stainless steel were used, and the fish was caught by jig.