Effects of Dunaliella algae (Dunaliella salina) on different color skin in rainbow trout (Oncorhynchus mykiss)

Abstract

This study was conducted to measure density of β-carotene and the effects of Dunaliella algae on color skin changes of the rainbow trout. Rainbow trout were separated in five equal groups and were fed for three months with diets containing 0, 5, 7, 9 and 11g of pure dried Dunaliella in each kilogram of food, respectively. Skin samples were taken from 10 random collected fish, at the end of third months of culture and after sampling from high part of lateral line, between dorsal and anal fin, the samples send to the laboratory to measure skin factors. The colors of fish skin measured by spctophotometri.
Results indicated that by increasing of Dunaliella aglae and growing weight, the density of β-carotene was also increased. Treatment 4 had highest effect on growing weight of fish and had significantly difference with other treatment, especially with treatment 1 (P<0.05).
Results also showed that increasing skin of treatment 4 had highest reserving of β-carotene in skin, within the limits of 0 to 11 and Dunaliella aglae containing β-carotene, has favorable effects on increasing skin color of rainbow trout.