Author(s): Roshanthini R, Vanmathi S and Dr. Yuvaraj D

Abstract: A 31 day experimental study was conducted to access the growth performance of koi carp (Cyprinus carpio) fingerlings with average initial body weight of (1.20±0.06g) and the average length of (2.4±0.3cm). In experiment, three practical diets were designed. Diet-A (spirulina) contains 67% of crude protein, Diet-B (Azolla) contains 75% of crude protein and Diet-C (control) contains 86% of crude protein. A total of 60 fingerlings were stocked at 10 fish per plastic container of 20 liters capacity. Six experimental groups were made and the experimental diets were fed to three replicate groups of the fingerlings. Three days once the biomass for each group was established before the first feeding. Fish were fed four times daily in equal portions. After the experiment was completed, Average Length (TL), Average Body Weight (BW), Specific Growth Rate (SGR), Feed Conversion Ratio (FCR) and Survival rate were determined. In these 31 days study the highest weight gain recorded as 8.02±2.12g in D2 fishes respectively. The percentage weight gain recorded as 502.5±166.99%, 568.33±177.31% and 564.16±176.29% and the percentage length gain recorded as 145.83±47.41%, 170.83±57.04% and 158.33±53.82% in D1, D2 and D3 respectively from initial weight. The results suggest that the growth is better in D2 which contains Azolla. The Feed Conversion Ratio (FCR) ranged between 0.043-0.049. The survival was recorded in D1, D2 and D3 as 50%, 80% and 70% respectively. It is inferred that the Diet-B (Azolla) is more effective, than the Diet-A (spirulina) and Diet-C (control).

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