Studies On Gynogenesis And Artificial Sex Reversal Of Jian Carp

In fish, the growth differences between male and female were found. The body weights of female common carp were higher than that of male about 30% in the two years of age in the same waters. If all-female populations were cultured, its growth rate should be higher than mixture population at least 10%.In order to establish the breeding technique of all-female Jian carp, Cyprinus carpio var. jian, gynogenesis and sex reversal of Jian carp were studied. The sperms from red goldfish, Carassius auratus var. red, were inactivated by UV-ray (30W, 8.5cm, 15min), and the eggs from Jian carp were fertilized by the inactivated sperms of red goldfish. Some fingerlings were obtained from the gynogenesis. When they grew into 1-1.5cm in body length, feed them with feedstuffs supplemented 50ppm 17α-methyltestosterone. The fish originated from gynogenesis were identified by morphological, RAPD and DNA content analysis.Through optimizing the related parameters and conditions, the success rate of gynogenesis and sex reversal were 23% and 75% respectively. The breeding technique of all-female Jian Carp was established by a combination gynogenesis and sex reversal.