Production of interploid triploids by 4n × 2n blunt snout bream (Megalobrama amblycephala. Yih) and their first performance data |
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| Authors: | Si-Fa Li Shu-Ming Zou Wan-Qi Cai & Huai-Yu Yang |
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| Institution: | Key Laboratory of Aquatic Genetic Resources and Aquacultural Ecosystem, Ministry of Agriculture, Shanghai Fisheries University, Shanghai, China |
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| Abstract: | 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♀× 4n♂, at different reproductive ages was similar to that of control, but higher than that of positive interploid triploid, 4n♀× 2n♂. Additionally, the development rate of embryos of the positive interploid triploid, 4n♀× 2n♂, was slower than that of control and the negative interploid triploid, 2n♀× 4n♂. Gonad growth of the positive and negative interploid 3n was significantly (P<0.01) affected by parents, and spawning could not be induced both in females and males at the 2+ age. The negative interploid 3n (2n♀× 4n♂) had a significantly higher survival rate than the positive interploid 3n (4n♀× 2n♂), but close to the level of the control (P<0.05). The daily growth rate of the negative interploid 3n was similar to that of the good breed ‘Pujiang No. 1’ blunt snout bream (2n) during the early life stages. |
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| Keywords: | Megalobrama amblycephala interploid triploid growth survival GSI |
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