Abstract
Effect of two light regimes 16/8 (16 hours - light and 8 hours - darkness) and 24/0 (24 hours - light) on the lipid content of juvenile Atlantic salmon (at the 1+ age) in the process of growth and development from August to October was carried out in a fish farm. The content of total lipids, structural lipids – phospholipids (PL), their classes (phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, sphingomielin, and lysophosphatidylcholine) and cholesterol (CHOL), reserve triacylglicerols (TAG), diacylglycerols (DAG), free fatty acids (FFA), cholesterol esters (ECHOL) were analysed. It was shown that index of ratio structural and reserve lipids (PL+CHOL/TAG+ECHOL) is increasing during growth and development of young’s Atlantic salmon (1+) principally than in control options. The data obtained indicate the predominance of the structural growth of organs and tissues over fat accumulation to a greater extent in fish with additional illumination in this period. These changes were accompanied by an increased growth rate of juvenile salmon in September and October under two light conditions compared with the control and those in August.
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