Islam Asiful
Kazan State University, Kazan, 420008 Russia.
Dev Growth Differ. 2005 Jan;47(1):1-6. doi: 10.1111/j.1440-169x.2004.00773.x.
The embryonic and larval development of Thai pangas was investigated during peak (May-July 1995) and late spawning (August-October 1995) periods. The fertilized eggs are adhesive and spherical with a yellowish or greenish-brown egg capsule. The yolk sac is yellowish-brown in color and 1.20-1.80 mm in diameter. Nine hours post-fertilization, the first cleavage stage, embryonic shield, head, tail region, neural grooves and somites were evident. The incubation period ranges from 24-36 h at a temperature of 20-30 degrees C. The newly hatched larvae are quite transparent and light yellowish in color with a body length of 2.98-3.10 mm. Eye pigments appear and the heart starts to work within 12-14 h of hatching. In 1-day-old pro-larvae, the mouth becomes well developed; barbules are elongated, prominent and look like tiny threads. The yolk sac is fairly well absorbed and the palatine teeth are fully developed during the 3 day pro-larval stage. At the end of 12 days of larval development, the stomach becomes functional and aerial respiration starts. After 2 weeks, the young fry is well-developed, and is of an adult appearance, that is, measuring up to 13.56 mm in length.
在泰国鲇的繁殖高峰期（1995年5月至7月）和繁殖后期（1995年8月至10月）对其胚胎和幼体发育进行了研究。受精卵具粘性，呈球形，有黄褐色或绿褐色的卵膜。卵黄囊呈黄褐色，直径为1.20 - 1.80毫米。受精后9小时，进入第一次卵裂期，可见胚胎盾、头部、尾部区域、神经沟和体节。在20 - 30摄氏度的温度下，孵化期为24 - 36小时。刚孵出的幼体相当透明，呈浅黄色，体长2.98 - 3.10毫米。孵化后12 - 14小时内出现眼色素，心脏开始跳动。在1日龄前期幼体中，口发育良好；触须伸长、突出，看起来像细线。在3日龄前期幼体阶段，卵黄囊被充分吸收，腭齿完全发育。幼体发育12天后，胃开始发挥功能，开始进行空气呼吸。2周后，幼鱼苗发育良好，具有成鱼的外观，即体长可达13.56毫米。
