Sammendrag
The genetic population structure of haddock in Northeast Atlantic wat ers was studied using polymorphic isozyme loci as genetic markers. 34 59 specim from 38 locations were submitted to electrophoresis and gen otyped at eight polymorphic isozyme loci. Allele frequency analysis g ave no clear indications of a genetic subdivision in the species with in the Northeast Atlantic, but some geographic trends were seen: Hadd ock from Icelandic waters differed somewhat at one locus. The allele frequency differences between the Icelandic sample and the other samp les were however small, and large samples, which provide increased st atistical power, seem to be necessary in order to enable population d iscrimination. A tendency of genetic "isolation by distance" was obse rved in haddock collected in Norwegian fjord and coastal waters. No e vidence of genetically distinct haddock stocks was found in any of th e represented Norwegian fjords. The genetically most deviating sample in the study was collected in the Barents Sea. However, small sample size and hence uncertainty in the allele frequency estimates prohibi ted firm conclusions on a distinct haddock population in the north.
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