黄斑篮子鱼仔、稚、幼鱼形态观察与生长研究

Morphology and growth of larval, juvenile and young Siganus oramin

为了解黄斑篮子鱼(Siganus oramin)胚后发育特点,对其早期发育阶段进行了形态学观察,并对其各时期的形态特征和生长特性进行了描述与分析。根据卵黄囊和油球消失、仔鱼开口与摄食、鳍膜消退、鳍棘变化、色素沉积和全身被鳞等发育特征,把黄斑篮子鱼胚后发育分为仔鱼期(包括早期仔鱼和后期仔鱼)、稚鱼期和幼鱼期。黄斑篮子鱼初孵仔鱼全长(1.913±0.105) mm,在水温23~24.3℃,3日龄开口;6日龄卵黄囊和油球被完全吸收,进入后期仔鱼期;17日龄鳍膜消失,各鳍发育基本完成,进入稚鱼期;33日龄鳞片覆盖全身,完成变态,外部形态特征与成鱼相近,进入幼鱼期。仔稚鱼生长随日龄的增长呈现出先快后慢再快的生长趋势;第2背鳍棘和腹鳍棘出膜后随日龄不断伸长,28日龄长到最大值,之后逐渐收缩。

In order to study the development and characteristics of larval,juvenile and young Siganus oramin,we analyzed the morphology of early development stage of S.oramin and described the morphological characteristics and ecological habits of different periods in detail.According to the change of the yolk sac and oil ball,oral fissure,fin membrane and spine,pigment and scales of the fish,the post embryonic development of S.oramin was divided into stages of early larva and late larva,juvenile and young fish.The total length of newly hatched larva was(1.913±0.105)mm.The larva started to feed on 3 dah at water temperature of 23?24.3℃.On 6 dah,the yolk sac and oil ball of the larva were absorbed and disappeared,then the larva developed into late larvae stage.On 17 dah,the fin membrane of the fish disappeared and the development of the fins basically completed,then the fish developed into ju-venile stage.On 33 dah,the whole body of the fish was covered with scales,completing metamorphosis and developing into young fish stage.The growth of larval,juvenile and young S.oramin showed a trend of rapid-slow-rapid trend with age.The 2nd dorsal fin spine and the pelvic fin spine continued to elongate with age,and reached the maximum on 28 dah then gradually contracted.