Heterosis and maternal effect on parameters related to productivity of 25 cross populations between five strains of common carp

Heterosis is a comparison of the performance of hybrid fish compared to their parents. Positive heterosis indicates the hybrid performance is better than the parents' average. The maternal-effect in the hybridization process causes the heterosis not to be the only consideration in the formation of hybrid fish. The primary goal of this study was to estimate heterosis and conduct an evaluation of the maternal effect, especially on parameters related to the productivity of cross-population between five common carp strains in Indonesia, specifically Majalaya (MJ), Rajadanu (Rj), Sutisna (St), Wildan (Wd), and Sinyonya (Sy). The grow out of the hybrid and inbred line populations was carried out in 25 net cages, measuring 5x5 meters, for 90 days. The fish rearing was conducted with three replications. The results showed that the highest heterosis for harvested biomass as the productivity parameter was achieved in the five crosses, that is, Rj >< St, Rj >< Mj, Mj >< St, Sy >< Stand Sy >< Mj. The common carp strain with the highest maternal effect on the productivity parameter is the Majalaya strain. Female selection in the Majalaya strain affects the performance in terms of phenotypic characteristic of the cultured hybrid common carp