摘要
The morphological development, including the fins, body proportions and pigmentation, of laboratory-reared larval and juvenile Pangasianodon hypophthalmus was described and their behavioral features were observed under rearing conditions. Body lengths (BL) of larvae and juveniles were 3.0 ± 0.2 (mean ± SD) mm just after hatching, and 12.9 ± 1.1 mm on day 13, reaching 23.4 ± 1.8 mm on day 25 after hatching. Aggregate fin ray numbers (for caudal fin, principal soft ray number) attained their full complements in specimens larger than 12.8 mm BL. Notochord flexion began in yolksac larvae on day 0 (10.5 h after hatching), with teeth buds and barbels appearing with jaw formation in yolksac flexion larvae on day 1. Melanophores on the body increased with growth, with a broad vertical band forming on the lateral line and an oblique band extending from above the pectoral fin base towards the forepart of the anal fin during the postflexion larval and juvenile stages. Body proportions became relatively constant in juveniles, except for maxillary barbel length (MBL), which continued to decrease. Yolksac flexion larvae started feeding on day 2 with the onset of intense cannibalism. Yolks were completely absorbed by day 3, and cannibalism ended by day 6. Subsequently, fish displayed a schooling behavior with growth, preferring relatively dark areas during the juvenile stage.
摘要译文
该形态的发展，包括散热片，身体比例和色素沉着，实验室饲养的幼体和Pangasianodon hypophthalmus被描述和他们的行为特征进行饲养条件下观察。幼虫体长（BL）和少年分别为3.0±0.2刚孵化后（平均值±SD）毫米，12.9±1.1毫米13天，孵化后达到23.4±1.8毫米25天。总结鳍条数字（尾鳍，主光线柔和数）达到充分互补的标本比12.8毫米BL大。脊索屈曲开始yolksac幼虫在第0天（孵化后10.5 h）中，用牙齿芽和触须出现与下巴的形成yolksac屈曲幼虫第1天黑素细胞在体内随增长，在横向宽纵向带形成线从上面向着臀鳍的postflexion幼虫和少年阶段，在前段胸鳍基部延伸的斜带。身体比例成为未成年人相对恒定的，除了上颌触须长度（MBL），继续下降。Yolksac屈曲幼虫喂养开始第2天与食人强烈发作。蛋黄完全被第3天吸收，食人被随后6天结束，鱼显示教育与行为的增长，在少年阶段宁愿相对黑暗的区域。
Shinsuke Morioka [1] Kosuke Sano [2] Phoutsamone Phommachan [3] Bounsong Vongvichith [3]. Growth and morphological development of laboratory-reared larval and juvenile Pangasianodon hypophthalmus[J]. Ichthyological Research, 2010,57(2): 139-147