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Summary In the first half of the paper a review is given of the occurrence and migratory habits of Baltic cod based on experience since the 1950s, results of extensive tagging experiments combined with information on changes in allele frequency for haemoglobin types, in meristic characters, and in otolith types. The latter pan of the paper is an account of about 15 transplantation experiments with tagged cod to study a potential homing ability of the fish. The very great importance of the threshold areas inside the Baltic and out to the Kattegat is stressed, and so are the hydrographic conditions in general for cod recruitment and migration. The waters west of Bornholm constitute an area of hydrographic instability with varying cod migrations and passive transport of fry with the currents. The migration east of Bornholm refers—except for local stocks and a varying contribution from the west‐mainly to fish grown up in the central Baltic proper and northern areas. The latter fish migrate primarily southward for spawning, and as adults they usually stay in the southern waters east and north of Bornholm. The results of the transplantation experiments support a strong direct linkage of cod migration and hydrographic factors. Cod that were tagged and transplanted to a new area behaved and moved in the same way as the local stock. Indications of “homing” can be found in areas with suitable hydrographic gradients, such as changes in salinity, for example in the Öresund.
Journal of Applied Ichthyology – Wiley
Published: May 1, 1985
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