泥鳅胚胎和幼鱼发育的研究

OBSERVATIONS ON THE EMBRYONIC AND LARVAL DEVELOMENT OF MISGURNUS ANGUILLICAUDATUS (CANTOR)

本文研究了用人工授精、孵化方法获得的泥鳅胚胎、幼鱼的形态特征。此项研究于1983年3—5月份在珠海市进行。 卵圆球形,具弱粘性,卵径0.72—0.84毫米。在水温19.5—23℃情况下,多数受精卵经26小时40分后孵化出苗。初解仔鱼全长1.95—2.4毫米,体节26—32对。在水温19—28℃情况下,孵化2天后,幼鱼具长条状外鳃。5天后,幼鱼卵黄囊大部分被吸收。15天后,外鳃消失,内鳃形成。45天后,幼鱼外部形态发育完全,形似成体。

This present paper deals with the morphological characteristics of the egg, embryonic and larval development of Misgurnus anguillicaudatus (Cantor)., Thematerials were obtained from artificial fertilization and hatching. The observationshave been carried out from March to May 1983 in Zhuhai city, Guangdong Province.The eggs of the fish are adherent, spherical and small with a diameter of 0.72-0.84mm. The fertilized eggs hatched out for 26 hours and 40 minutes at the watertemperature of 19. 5--23.0℃. The body of newly hatched larvae is 1. 95--2.4mm intotal length wi1h 26--32 pairs of myotomes. Two days after hatching, the externalgills appear as long stripe and perform fhe function of respiration. 5 days after hatch-ing, the yolk sac almost absorb and the larvae start to eat. 15 days after hatching, theexternal gills disappear and the internal gills form. 45 days after hatching, the youngfish develop in full and rssemble to the adults.