Author(s): Manas K Maiti, Deepjyoti Bora, Nandeesha TL, S Sahoo, Adarsh BK and Sikendra Kumar

Abstract: A feeding trial of 45 days was conducted to observe the effects of dietary natural source of carotenoids on growth and colour enhancement of koi carp, Cyprinus carpio fingerlings. Five diets were prepared with different natural carotenoids supplementation such as beet root powder (BP), carrot peel powder (CP), tomato peel powder (TP) and their mixture (MP) and designated as C (0% supplementation), T1 (1% BP), T2 (1% CP), T3 (1% TP) and T4 (1% MP). The growth parameters was analysed and significantly (P<0.05) higher weight gain percentage was reported in T2 however, it was comparable with T3 group and lowest weight gain percentage observed in T1. Specific growth rate (SGR) was manifested significantly (P<0.05) highest in T3 followed by T2 was found lowest in T1 group. Food conversion ratio (FCR) reported lower in T2. The survival percentage was manifested highest in T3 followed by T4 and T2 groups. The colour analysis of the fishes was done by colorimetry and the three colours such as lightness, redness and yellowness were manifested highest in T4 group fed with mixture of carotenoids powder followed by T2. The carotenoid deposition in the fish body was also analysed and was observed significantly (P<0.05) highest in T1 followed by T4 group while lowest was found in T2. The overall study revealed that natural carotenoid sources such as beet root, carrot peel, tomato peel and their powder mixture gave good growth and coloration at 1% however in present study, the fish group fed with 1% CP was more effective in enhancing the growth and colouration of koi carp, Cyprinus carpio.

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