1992•Canadian Journal of ZoologyRequires access

Parr–smolt transformation of a nonanadromous population of Atlantic salmon (Salmo salar) in Norway

Magne Staurnes, Grete Lysfjord, Ole Kristian Berg

Abstract

Morphological and physiological indices of parr–smolt transformation of fish from anadromous and nonanadromous hatchery-reared populations of Atlantic salmon (Salmo salar) were compared. Both anadromous and nonanadromous Atlantic salmon showed a complete smolt colouration and had a similar high gill Na+,K+–ATPase activity (significantly (P < 0.05) different from that of parr), indicating both morphological and physiological aspects of parr–smolt transformation. The evolutionary stability of the parr–smolt transformation of nonanadromous Atlantic salmon is discussed.

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Key concepts: Salmo, Fish migration, Biology, Smoltification, Fishery, Transformation (genetics), Hatchery, Population