Induction of pond-cultivated Anguilla japonica gonadial development by controlling temperature in high temperature season

Abstract

Abstract: In this study,the pond-cultivated Anguilla japonica was induced to mature by artificially controlling temperature at 18±2 ℃ in high temperature season(from June to September),with injection of hCG and CPE.The results showed that both the male and the female eel could be induced to mature,and the artificial maturation induction rate was 73.33% and 67.77%,while under non-controlling temperature 25～32 ℃,the maturation induction rate was 0 and 33.33%,respectively.In an ovulation induction test,the matured female eels were induced,with a spawning inducement rate of 70%,and a fertilization rate of 32%,which approached or reached the levels in low temperature season(with an average of 62.1% and 34.2%,respectively),and the zygote developed normally.At the temperature 22 and 24 ℃,the zygote hatched to fry in about 39 h 15 min and 34 h 9 min.The experiment proved that it was possible to induce the eel to mature by controlling temperature in high temperature season,which provided some theoretical foundations for the techniques of artificially breeding eel in whole year.

Key words: Anguilla japonica, High temperature season, Artificially controlling temperature, Maturation induction

CLC Number:

Q178.1

WANG Guangjun, XIE Jun, YU Deguang, ZHU Hongyou. Induction of pond-cultivated Anguilla japonica gonadial development by controlling temperature in high temperature season[J]. Chinese Journal of Applied Ecology, 2005, 16(11): 2204-2207.

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