Growth and Survival of Butterfly koi (Cyprinus carpio) Fingerlings at Different feeding rates.

A study on Growth and Survival of Butterfly koi (Cyprinus carpio) was conducted at 2361 Kaunlaran subdivision Polomolok, South Cotabato for a period of 60 days from February 20, 2022 to April 20, 2022. Nine (9) units of refrigerator tubs 1.143 m x 0.5588 m x 0.4572 m were used. Each refrigerated tub had a stocking density of ten (10) butterfly koi, and replicated thrice (3). In all treatments, feed was supplied twice (2) daily at 7am and 5pm using feeding rates of 4%, 8% and 12% in the first 30 days and adjusted to 2%, 4% and 6% in the last 30 days.

After 60 days of culture, the highest mean body weight was obtained by fish in Treatment III with 11.93 g, followed by Treatment II with 5.43 g and Treatment I with 2.60 g. The highest mean weight gain was obtained by fish in Treatment III 10.88 g, followed by Treatment II with 4.38g and the lowest in Treatment I with 1.55 g. Fish in Treatment III obtained the highest mean daily weight gain of 0.1814 g/day, followed by fish In Treatment II with 0.0731 g/day and the lowest was obtained by fish in Treatment I with 0.0258 g/day. Statistical analysis on mean body weight, daily weight gain, and weight gain were significantly different (p<0.05). Treatments also did not differ significantly in survival rate (p>0.05). All maintained 100% survival rate throughout the study period.

Mean FCR Treatment I had the highest feed conversion ratio of 2.05 compared to Treatment II and Treatment III with 2.02 and 1.72, respectively. Statistical analysis showed that there was significant difference (p<0.05) among treatments.

The study revealed that butterfly koi (Cyprinus carpio) fingerlings grow better when fed at higher rates. The optimum feeding rate for this fish is 12% on the first month and 6% on the 2nd month. The feeding regimen used in this experiment (4 to 2%, 8 to 4%, 12 to 6%) did not cause remarkable effect to the survival rate and significant differences in the FCR of butterfly koi (Cyprinus carpio) fingerlings.