The effects of various carotenoid levels of Spirulina platensis microalgae on eegs and larval stages of Onchorhynchus mykiss

The effect of various carotenoid levels and color range observation of carotenoid by using five doze (0, 5, 10, 15, 20%) Spirulina platensis in the diet of 45 number of (Onchorhynchus mykiss) brood by mean of (1046±75gr) weight and (46.5±0.6 cm) length on eggs and larval stages of rainbow trout from five treatment tanks (1×1.5×6m) by three replicate for 90 days in2011-12 have done. At last the results of Analyzed variance and Mean Duncan test treatments showed that; the treatment with the maximum level of Spirulina platensis with 1.28mg\gr had the best level of carotenoid observation and there is low amount of this observation by 0.39 mg\gr carotenoid in control treatment and illustrated high significance difference between this treatments while have shown significant difference between three last treatments (10-20% Spirulina platensis in brood diets) (P<0.05). In addition to by using the various levels of carotenoid in (Onchorhynchus mykiss) brood diet have shown highly significance difference between eggs and larves of them (P<0.01).Also the visible carotenoid color ranges observation by Spirulina platensis consumption from zero to 20 percent concentration followed the increasing way in eggs and larva's of rainbow trout.