This paper studied the effects of some ecological factors (temperature,pH,hatching method and ammonia) on the embryonic development of ricefield eel.The results indicated that the optimum hatching temperature of ricef...This paper studied the effects of some ecological factors (temperature,pH,hatching method and ammonia) on the embryonic development of ricefield eel.The results indicated that the optimum hatching temperature of ricefield eel was 25~28 ℃,and no significant difference was found about the effects of pH within the range of pH 5.5~9.5 on the hatching rate of oosperm.Dripping water incubation had a higher hatching rate of oosperm than staticing water incubation,and the hatching rate of oosperm decreased with increasing ammonia content.The present study provided an available suggestion for the all-artificial and half-artificial breeding of ricefield eel.展开更多
观察并详细记录了暹罗斗鱼胚胎发育的过程,结果显示:暹罗斗鱼的受精卵为圆形,不透明的乳白色,沉性卵,平均卵径1.116 mm,在水温25.2℃~27.0℃下,受精卵后36 h 54 min孵出仔鱼。依据各发育阶段的形态变化,将其胚胎发育划分为卵裂期、囊...观察并详细记录了暹罗斗鱼胚胎发育的过程,结果显示:暹罗斗鱼的受精卵为圆形,不透明的乳白色,沉性卵,平均卵径1.116 mm,在水温25.2℃~27.0℃下,受精卵后36 h 54 min孵出仔鱼。依据各发育阶段的形态变化,将其胚胎发育划分为卵裂期、囊胚期、原肠胚期、神经胚期、器官形成期、心跳期和孵化期7个阶段。展开更多
文摘This paper studied the effects of some ecological factors (temperature,pH,hatching method and ammonia) on the embryonic development of ricefield eel.The results indicated that the optimum hatching temperature of ricefield eel was 25~28 ℃,and no significant difference was found about the effects of pH within the range of pH 5.5~9.5 on the hatching rate of oosperm.Dripping water incubation had a higher hatching rate of oosperm than staticing water incubation,and the hatching rate of oosperm decreased with increasing ammonia content.The present study provided an available suggestion for the all-artificial and half-artificial breeding of ricefield eel.
文摘观察并详细记录了暹罗斗鱼胚胎发育的过程,结果显示:暹罗斗鱼的受精卵为圆形,不透明的乳白色,沉性卵,平均卵径1.116 mm,在水温25.2℃~27.0℃下,受精卵后36 h 54 min孵出仔鱼。依据各发育阶段的形态变化,将其胚胎发育划分为卵裂期、囊胚期、原肠胚期、神经胚期、器官形成期、心跳期和孵化期7个阶段。