عنوان مقاله [English]
This study was conducted to evaluate the use of beta carotene as a synthetic pigment and spirulina algae and yellow sweet pepper as natural pigments on pigmentation and growth performance of Labidochromis caeruleus. has been studied in 120 Labidochromis caeruleus fish of average weight (2.51±0.05 gr) in 3 treatments and 1 control and each with 3 replicates. Twelve aquariums of 30 ×40×70 dimension were used. The control group had no food additives (basic food was fed). of Flower horn in 12 aquariums Equal to 10 fish per aquarium. The trial was continued for 8 weeks. The control group had no food additives (basic food was fed). First treatment beta carotene (40 mg/Kg food), treatment 2 spirulina algae and treatment 3 yellow sweet pepper (each one with level of 10 gr/Kg food)) The significance of them was analyzed using One-way ANOVA analysis software Spss 19. Also some index of growth like BWI, FCR, and SGR. Also, at the end of the period from each treatment, 9 fish were selected at to random. To assess the color change, the colorimetric system L*a*b* was used, using device CHROMA METER CR_40. There was no significant difference regarding all three factors. Generally, it can be concluded that the use of beta carotene، spirulina algae، yellow sweet pepper of walnuts to fish food ration, cause no impact on some growth factors and as well as survival rate and food conversion rate, but the apparent color index impact was significanot (P>0.05). Also, the results showed that there was no significant difference in growth indices between fed treatments containing beta-carotene, spirulina algae and pepper bacilli with control treatment (P>0.05).