Abstract
Abstract A total of 521 cod in samples from eight coastal and fjord locations along the Norwegian coast, from the Russian border to mid-Norway, were assessed for allele frequencies at six polymorphic tissue enzyme loci (LDH-3*, PGM-1*, MDH-3*, IDHP-1*, PGI-1* and PGI-2*). According to individual otolith deposition patterns, the four northernmost samples contained both North-East Arctic (“arclie(”) cod and Norwegian coastal ((“coastal(”) cod. At five of the loci, cod appeared to be one genetically homogeneous unit thmughout the sampling area. Locus LDH-3*, however, showed substantial inter-sample genetic heterogeneity. At this locus, samples from northern Norway (north of the Lofoten Islands) had significantly lower frequencies of the LDH-3* 100 allele than those from mid-Norway, whereas the frequencies within each of these groups were not significantly heterogeneous. Among cod typed as “arctic”, however, there was a statistically significant surplus of LDH-3* heterozygotes on some locations and in some ag...
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