【摘要】 本文描述了河川沙塘鳢胚胎、仔、稚鱼消化系统的发育过程，对仔、稚、幼鱼的摄食作了较深入的研究。仔鱼开口摄食期为孵化后的2－7天，第10天的仔鱼，卵黄方被完全吸收，属混合性营养类型，混合营养期为孵化后的2－9天。小型枝角类是仔鱼适宜的开口饵料；仔、稚鱼期的主要饵料亦为枝角类，其次为桡足类；幼鱼则转为以小蚯蚓和摇蚊等底栖动物为主要食物。从仔鱼到幼鱼，摄食量逐渐增大。稚鱼昼夜摄食节律变化明显。更多还原

【Abstract】 This paper deals with the development of the digestive system and the feeding of the larval, juvenile and young dark sleeper Odontobutis potamophila. Eleven days after fertilization, the digestive tube begins to appear. And afterwards, the digestive tube divides into esophagus, stomach and intestines, the liver forms, teeth and gill rakers appear and increase in number and the mouth opens too. Two days after hatching,the larval anus opens and the larva begins to feed. The initial feeding stage of larvae is 2-7 days after hatching.The yolks of all larvae are completely absorbed on the 10th day after hatching, hence the larva belonges to the type of mixture nutrition. The mixture nutrition is 2-9 days after hatching and it is longer than the initial feeding stage. The suitable food of larvae in the initial feeding stage is cladoceran. The width of food is 180-370μm and its ratio to the width of mouth is 24．00-41．11%. The main food is cladoceran, then is copepods during larva and juvenile stages. During young fish stage, the main foods are freshwater oligochaetes and chironomids. The food ration increase gradually from the larva stage to the young fish stage.The study on diurnal feeding rhythm of juvenile shows that the peak of feeding lies at 14:00-18:00. The daily ration of juvenile(the relation of the total weight weight of food taken in a day to the weight of the juvenile)is 16．11%.更多还原