广东池养鲻鱼的繁殖生物学

The reproductive biology of grey mullet pond culture in Guangdong Province

观察广东池养鲻鱼的繁殖生物学，鲻亲鱼个体一般雌性比雄略大，在池塘养殖条件下，雌雄性比约为２∶１，且有随年龄增长雌鱼比例增大的趋势；广东池养鲻鱼的繁殖季节为１１月至翌年２月；繁殖力与体长体重呈正相关关系，个体绝对怀卵量４８万～４８０万粒；在水温１９．１～２０．４℃，盐度３２的条件下，受精卵历时５７ｈ１０ｍｉｎ孵化出鱼苗。

The results on the investigation of the reproductive biology of grey mullet (Mugil cephalus) in Shenzhen and Dongguan, Guangdong Province are summarized as follows. Body size of female spawners is a little larger than that of the male. Under the pond culture condition, sex ratio of spawner is approximately 2∶1 in terms of female to male, and the number of female increases with aging; In Guangdong Province, the breeding season of grey mullet in captivity is from November to February, judging from the monthly changes of G S I and the development of oocyte; Fecundity is correlated positively with body length as well as body weight, individual average absolute spawning amount ranges from 48×10 4 to 480×10 4 eggs; Hatching time of fertilied eggs expends 57 h 10 min under the conditions of water temperature 19.1～20.4℃, salinity 32.