Physiological and biochemical basis of salmon young fishes migratory behavior
نویسنده
چکیده
Initial stages of salmonid fishes development are carried out in freshwater. At the first stage young fishes form structures and systems connected with ability to live in freshwater. At the second stage a complex of structural, physiological and biochemical changes directed on preparation of the organism for downstream migration and seawater entry takes place[1]. After completion of smoltification under certain conditions young fishes migrate downstream the river towards the sea. The cause of migratory state occurrence and conditions of young salmonid fishes migration downstream the river towards the sea remain obscure. The purpose of this work is to find out probable cause for occurrence of the migratory condition stimulating young fishes to roll downstream the river towards the sea based on comparative analysis of structural, physiological and biochemical processes occurring during smoltification. Solving this task has important theoretical value and plays an important role in optimization of measures to improve reproduction of valuable salmonid fishes in industrial conditions at fish farms. 2. Structural, physiological and biochemical transformations at the young salmonid fishes during smoltification
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