Effects of Dunaliella microalgae (Dunaliellasalina) on different levels of complement C3, C4 and antioxidant capacity in rainbow trout (Oncorhynchus mykiss).

Main purpose of this research was to study the effects of Dunaliella microalgae on physiological and antioxidant capacity of the rainbow trout. It was planned to measure the amount of complement C3, C4 and proxidases enzyme of the fish. Rainbow trouts were separated in five equal groups and were fed with diets containing 0.,5,7,9 and 11 grams of pure dried Dunaliella in each kilogram of food respectively. Blood samples were taken from 25 random collected fish, at the end of first and third months of culture and were send to the laboratory to measure complement and proxidase factors. Result indicated that the amount of complement C3, C4 and proxidases enzyme in the blood plasma of those fish fed with Dunaliella algae, with the increased levels of Dunaliella in food, and increased weight, levels of C3, C4 and proxidases were also increased.Treatment 4 had highest effect on increased weight of fish and was significantly different with other treatments. In term of fish length , the longest length was observed in treatment 4 , which had significant different with treatment 1 (p<0/05). Obtained results indicated that Dunaliellaalgaecontaing β-carotene, has favourable effects on immune system of rainbow trout. Thus Dunaliella algae can be used as a nutrient in rainbow trout diet, improving fish weight and length gain while having physiological positive properties on the fish.

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