Interspecific Hybridization between Cyprinids Carassius auratus Goldfish and Cyprinus carpio Koicarp

Abstract

Koicarp and Goldfish were induced to spawn by administrating ovaprim. Each breeding set contained two males and one female in both species and the mature brooders were selected by sexual dimorphism. Induced breeding was attempted by intraperitonial injections of ovarpim at a dosage of 0.3ml/kg to goldfish and 0.3ml/kg to koicarp. Diameter of the fertilized eggs of goldfish ranged between 0.9-1.0mm;koicarp ranged between 0.9-1.10mm and hybrid ranged between 0.9-1.0mm. The percentage of fertilization of gold fish, koicarp and hybrid was 90%, 80% and 90% respectively. The length of the hatchlings were 2.7±0.2mm in koicarp, 2.6±0.2mm in hybrids and goldfish. The hatchlings started exogenous feeding when the yolksac was totally absorbed after 3 days. The chromosome number of hybrids is 2n=60, goldfish 2n=42 and koicarp 2n=78