Performa Reproduksi Induk dan Benih Hibrida Ikan Lele Afrika Strain Sangkuriang dan Mesir pada Fase Pendederan

Abstract

This study was performed to evaluate reproduction of broodstock and intraspecific hybrid juvenile performance of Egyptian African (M) and Sangkuriang catfish strains at nursery phase. Intraspecific hybridization of African catfish Clarias gariepinus was performed reciprocally (SM and MS) and purebreed (SS and MM), each was 3 replicates. Fish spawning was conducted by artificial fertilization, and larvae were reared at 1st, 2nd and 3rd nursery phases, subsequently. The results showed that broodstock performance of both strains were not significantly different (P>0.05) on all traits, except female’s gonadosomatic index. Fertilization and hatching rates of all hybrids were not significantly different (P>0.05). MM juvenile had higher growth performances but lower survival than other hybrids. Heterosis of total length, standard length, and body weight were varied, whereas the survival showed positive heterosis. SM juvenile showed positive growth heterosis in 3rd nursery phase (total length, standard length and body weight were 2.61; 2.16 and 4.79%, respectively). Survival heterosis of MS juvenile (24.20; 103.13 and 11.62%) was higher than SM juvenile (6.86; 48.57 and 3.09%) on all nursery phases.