Abstract
Considering conservation issues, qualitative features of fish intended for release are becoming the most important factor. We compared some morphological and physiological parameters of hatcheryreared (Žeimena Hatchery) and wild Baltic salmon juveniles originating from the same wild population of the Žeimena River (Svencionys district, Lithuania). Hatchery salmon parr were characterised by the accelerated growth rate. Their body mass and length, as well as the mass-length ratio and condition factors, were higher than those in wild salmon. Female gonads in both groups were at the stage of protoplasmic growth. However, differences in the development of hatchery-reared female gonads were observed. Histological analysis revealed that substage V oocytes were present in hatchery salmon females. No oocytes of this stage were found in wild females. The share of precocious parr males in hatchery samples was significantly higher than in the samples of wild population. The constituents of hatchery conditions – tempe...
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