Effect of partial supplementation of Chlorella sp. on growth performance and survival of Labeo catla (Hamilton, 1822) fry

This study was carried out to determine the effect of partial supplementation Chlorella sp. on growth and survival in Labeo catla fry as protein source in 60 days of feeding trial. A completely randomized experimental design was developed with 5 treatments and four replicates. Chlorella powder was added to the basal diet at a 0% (control) (T0), 5% (T1), 10% (T2), 15% (T3) and 20% (T4) and fed to the Labeo catla fry. Sampling was carried out at every 15 days to monitor growth performance and to adjust rations. The water quality parameters viz. DO; alkalinity, pH and temperature were found in the permissible range during entire experimental period. At the end of feeding trial weight gain, specific growth rate, feed conversion ratio, protein efficiency ratio and proximate analysis of fish carcass were evaluated. Growth performance, FCR, SGR, and PER of fish affected by Chlorella sp. supplementation. Survival rate was not affected by different amount of chlorella. Treatment T4, including 20% Chlorella in diet showed highest mean body weight, SGR, PER than those fed with other diets. FCR was lowest in treatment of Chlorella diet than control diets. In the proximate analyses of the fish showed highest protein in T4 (16.92%), fat in T4 (3.44%), ash in T4 (4.39%) and moisture in T0 (80.98%). results of the present study clearly showed that Chlorella sp. could be considered as a protein source for incorporation in Labeo catla fry diets to gain more weight.