Merkeforsøk med makrell i irske farvann i mai 1977 med F/F "Havdrøn"
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- Fisken og havet (1958- ) 
During the period 5 to 10 May a total of 14 033 mackerel was tagged off the southwestern coast of Irland. Internal tags of stainless steel were used, and the fish was caught by jig,
SeriesFisken og havet