The present papers demonstrates detailed biomorphometry of viviparous eel-pout Zoarces viviparus (L.) (involving 27 metric and 12 meristic characters), as well as the growth rate of length and weight (employing von Bertalanffy equations), with regard to both sexes. 150 specimens were examined in details, while in 248 the total length, body length, weight and vertebral count were recorded (with regard to both sexes). Both metric and meristic characters in the eel-pout from Little Belt are very variable, of wide ranges and high CV; especially in the length of anal fin and D depression length (in morphometrics) and count of spines, rays in D, and C fins (in meristics). Females grow a little faster in length and fairly faster in weight in the population studied. The growth rate of length and weight in fishes from Little Belt is slower when compared to data from the Pomeranian Bay. Sexual dimorphism is displayed in 5 metric characters in the sample investigated and in eel-pout from Pomeranian Bay. No confirmation is found in own results for the contention found in the literature on positive correlation between the count of vertebrae in eel-pout and salinity.

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