study of some growth indices and survival rate of un-matured tiger barb (barbus tetazone) during exposure to different light colors

abstract this research was conducted to study the effects of different light colors on growth indices (growth rate and specific growth rate), feed conversion and survival rate in tiger barb (barbus tetazone) fish for 6 weeks. 120 fish with an average weight 75 ±0.02 were respectively divided in four groups of white, natural, green and blue colors (with three replicates for each treatment). fish fed twice a day with biomar commercial food. results showed that growth indices (gr, sgr) and fcr were significantly different in varied light colors (p<0.05). white and green lights, respectively, led to the growth of highest and lowest in fish and were observed highest and lowest of fcr in natural and green light, respectively. there was no significant difference in fish survival rate in the four groups (p<0.05). results of present study showed that artificial light color can significantly effect on fish growth in barb tiger. so, using of a suitable light color can be obtain an optimal growth during of culture period in the fish.