Effect of Tank Colour on Growth Performance and Survival during Larval Rearing of Koi Carp (Cyprinus carpio)

Abstract

Cyprinus carpio commonly referred as Koi carp is one of the most traded fish in the ornamental aquaculture industry. The study describes the effect of different tank colour on growth and survival of koi carp spawn to fry by rearing them in different coloured tank at stocking density of 3 numbers/litre for 45 days. The initial weight and length of spawn was 3.68 ± 0.012 mg and 7.23 ± 0.163 mm respectively. Adlibitum feeding was done with commercial feed (powder) and live food twice daily. The highest mean length and weight after 45 days of rearing were recorded in green colour tank whereas lowest in red colour tank. The SGR was however lowest in orange colour tank. It may be due to the lowest stress level and better vision for feed intake in green colour tank as compared to others. This study concludes that the green is the best suitable colour for tanks use for koi carp larval rearing.