The physiological state of young Atlantic salmons Salmo salar (Salmonidae, Salmoniformes) from natural spawning and juveniles grown at a Fish Hatchery

• Published in: Journal of ichthyology Vol. 47; no. 5; pp. 394 - 400
• Main Authors: Alekseev, M. Yu, Donetskov, V. V., Zubchenko, A. V.
• Format: Journal Article
• Language: English
• Published: 01.06.2007
• Subjects: Freshwater; Salmo salar; Salmoniformes
• ISSN: 0032-9452; 1555-6425
• DOI: 10.1134/S0032945207050074

The comparison was made of the physiological state of young Atlantic salmons Salmo salar of the same age from natural and artificial reproduction. Qualitative and quantitative parameters of blood and a wide range of observed pathologies of alimentary origin suggested that the health of juveniles grown at the Umba Fish Hatchery (UFH) could not be considered satisfactory, and the survival of fish from the fish hatchery released to the river would be low. It was shown that the physiological state of juveniles obtained under artificial conditions grew much worse with age. Physiological parameters of 2-year-old juveniles came to norm during several months after their release. Visible pathological changes in the 3-year-old individuals were apparently irreversible. Analysis of data obtained led to the conclusion that complex researches are necessary in UFH to correct the diet, composition and quality of forage, and the sanitary-epizootological control of the fish- cultural process. Additionally, it seems to be expedient to convert UFH to the releasing of 2-year-old juveniles.