Production of interploid triploids by 4n x 2n blunt snout bream (Megalobrama amblycephala. Yih) and their first performance data

Positive and negative interploid triploids of blunt snout bream (Megalobrama amblycephala) were produced by reciprocal crossing autotetraploids with diploids. Fertilization and hatching rate of negative interploid triploid, 2n[female] x 4n[male], at different reproductive ages was similar to that of control, but higher than that of positive interploid triploid, 4n[female] x 2n[male]. Additionally, the development rate of embryos of the positive interploid triploid, 4n[female] x 2n[male], was slower than that of control and the negative interploid triploid, 2n[female] x 4n[male]. Gonad growth of the positive and negative interploid 3n was significantly (P