Abstract:

To investigate the growth performance of progenies produced via gynogenesis by heterologous sperm of Carassius auratus var. pengsenensis, C. auratus var. pengsenensis was used as female, and C. auratus var. pengsenensis, Megalobrama amblycephala, Culter alburnus Basilewsky, and Elopichthys bambusa were used as male parent to construct four cross-combinations. The weight and body length of four gynogenesis groups at different days were determined. The results showed that during the whole experiment (0-180 days), the differences of growth rate in four groups were significant (P < 0.05). P-Q and P-G was significantly higher than P-T and P-P. By comparing the relative fatness of each group, the significant difference (P < 0.05) appeared on the 150 th day, the P-Q (3.9945) and P-G (3.7819) were significantly higher than P-T(3.3459) and P-P(3.3697). The growth curves (P-P: W=0.0627L^2.6705, R²=0.9822;P-T: W=0.0644L^2.6469, R²=0.9917; P-Q: W=0.0284L^2.9609, R²=0.9813; P-G: W=0.0648L^2.6586, R²=0.9697) were fitted according to weight and body length. This study indicates that the offspring of C. auratus var. pengsenensis produced by heterologous sperm can grow normally and show significant difference among the groups. The gynogenesis of C. auratus var. pengsenensis with Culter alburnus Basilewsky (P-Q) show better growth performance than other groups, which will have a popularizing prospect.

Key words: Carassius auratus var. pengsenensis, heterologous gynogenesis, growth trait, relative fatness, body weight-length relationship