Breeding and ................

Abstract

The study was carried out in the induced breeding and rearing performance of Indian Major Carps (Labeo rohita and Cirrhinus mrigala) at Fisheries Development Center, Bhandara, Chitwan from June to September 2022. The embryonic development from egg to fingerlings as well as fecundity rate, GSI, fertility rate, hatching rate, survival rate, and growth of both species were studied. The Ovaprim hormone at a ratio of 0.25 ml/kg for male and 0.5 ml/kg for female of Rohu and Naini were administrated. The fecundity of Rohu and Naini was observed between 227,540 to 675,000 and 161,400 to 608,400 while GSI was between 10.33% to 19.74% in Rohu and 10.71% to 28.15% in Naini respectively. The latency period observed was 7-8 hrs whereas the hatching occurred after 17-18 hrs. A total of 6 hapas (3 for Rohu and 3 for Naini) of 1×1×1m3 were used to study the growth of fish and 100 hatchlings were kept in each hapa. The fertility, hatching, and survival rate were 82.28-87.27%, 73.91-83.33%, and 62-73% in Rohu and 79.63-87.88%, 77.90-83.90%, and 59-75% in Naini respectively. The correlation between the length and weight of fish was found near 1 which represents a similar relation and the value of regression coefficient ‘b’ ranged from 2.1 to 2.5 showing negative allometry. The condition factor (K) and relative condition factor (Kn) were found >1 in both fish which shows proper growth of the fishes.