GENETICAL AND MORPHOLOGICAL VARIATION IN THE EELPOUTZOARCES VIVIPARUS

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Abstract
The geographical variation in genotypic and morphological composition is compared for populations of the eelpout, Z. viviparus (L.), in Mariager Fjord, Denmark. The morphological characters are number of vertebrae, dorsal fin hard rays, pectoral fin rays and pigment spots of dorsal fin. The geographical variation in these traits agrees well with that described by Schmidt half a century ago. The electrophoretical variation at 5 enzyme loci: Ada, EstIII, Got, PgmI and PgmII is described. The scale of differentiation is comparable for the 2 classes of traits, and differentiations between local populations down to a distance of .apprx. 10 km are shown.