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Effects of different alpha tocopherol and selenium additions in ratios with high contents of polyene acids on rainbow trouts salmo gairdneri r



Effects of different alpha tocopherol and selenium additions in ratios with high contents of polyene acids on rainbow trouts salmo gairdneri r



Fett Wissenschaft Technologie 89(5): 195-199



Polyen acids as phosphoric lipids are components of cellular membrane structures. Because of their autoxidative tendence a special protection of these fatty acids and by that of the cellular membrane is necessary. This is especially valid for trouts, because they have a great need of essential n-3 polyen acids. Selenium and tocopherols have a protective function against oxidations damages. Both active substances have been tested in two separated tests with rainbow trouts. The first test was carried out in a flow plant with selenium additions in steps from 0 to 0.6 mg. The .alpha.-tocopherol contents in the ratios of the second test, carried out in a partial circuit plant, vaired from 0 to 400 mg/kg feed. After about 10 weeks the first deficiency symptoms occurred in the shape of feed refusal and by that coherent growth depressions in the deficiency groups. Afterwards a nearly complete feed refusal and increased mortality took place. The fishes had pale, swollen gills with shortened gill lids, standing off. The liver was coloured to brown-yellow and they had anaemia. The hematocrite value was significantly lowered. All the other feed groups with addition of selenium and/or higher doses of .alpha.-tocopherol-acetate showed normal increases and equivalent good feed utilization. The investigations of the livers of the deficiency groups, carried out by light microscope and electron microscope, showed pathological symptoms, which are typical for a missing antioxidative protection.

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