短尾大眼鲷卵及仔、稚鱼的发育

THE DEVELOPMENT OF EGG AND LARVAE OF PRIACANTHUS MACRACANTHUS (CUVIER et VALENCIENNES)

摘要:

本文报道了用人工授精方法和拖取浮游仔稚鱼的材料,研究观察短尾大眼鲷的卵内发生的特征。成熟受精卵浮性,直径0.57-0.88毫米;油球一个,直径0.17—0.20毫米。在水温27℃中培养,受精后17小时可全部孵出仔鱼。胚体发育到尾芽离开卵黄时,在嗅囊附近♀听囊前后各出现一对黑色斑。油球位于吻下,其表面出现星状黑色素胞。这些特征一直保留到孵化后5小时的仔鱼。发育到后期仔鱼,头部开始生有枕骨棘,渐长♂向后伸长♂枪状。眼框骨也隆起,上沿出现小刺。直到稚鱼期体长♂毫米左右,枕骨棘开始退化变短,以后逐渐消失。

Abstract:

The present report deals with observations on the development of artificiallyfertillized egg and the postlarvae stage of Priacanthus macracanthus. The work wascarried out in Qinglan Harbour of Hainan Island in May 4, 1974. The postlarvaewere collected with plankton net from the North part of Nan Hai during themonths March to December, 1973. The fertilized eggs were transparent, sphericaland buoyant, At water temperature in 27℃, for 16.5 hours, the fertilized eggs hat-ched. The newly hatched larvae were 1.38mm in total length, and on the head anddorsal part of the body branched dark pigments appeared. 24 hours later the larvaereached fo 2.3mm in total length, and 5+19=24 myotomes were clearly seen. Thepostlarvae have an extremely large head, big-eyes, with a backward spear-shapedoccipital spine and the out margin of the supraorbital ridge was serrated. As it grewto juvenile many epidermal-spines appeared on the abdominal and the tail regions.