金沙江和长江长薄鳅人工繁殖及胚胎发育

摘要

Artificial propagation of Leptobotia elongata collected from the Panzhihua section of Jinsha river and Luzhou section of Yangtze river were studied from June to July in 2017. At the same time the embryonic development of Leptobotia elongata from Panzhihua section of Jinsha River were observed. In the experiment of artificial inducing spawning of 4 parents 18 000 fries were received,the study indicated that the females matured earlier than the males,The time they both reach sexual ma-turity may be in the end of June. Gastrula began in 5.0 h at 24℃,and the average hatching time was 31.0 h,the average length of the larvae was 5.2 mm. Before hatching the length of larvae and the diameter of egg membrane was about equal. the fish was able to stretch and swim freely in the egg membrane. This was different from other Cobitidae and most of Cyprinidae.%2017年6-7月分别对采集于金沙江攀枝花江段和长江泸州江段的长薄鳅 (Leptobotia elongata)进行人工繁殖试验,同时对金沙江攀枝花江段的长薄鳅进行胚胎发育的观察.结果表明,共催产长薄鳅4组,共获得鱼苗1.8万尾,长薄鳅雌性亲本成熟较雄鱼早,雌雄发育同步期在6月底.在水温24℃条件下对胚胎进行观察,发现受精卵发育为原肠胚的时间为5.0 h,平均出膜时间为31.0 h,出膜仔鱼平均长度为5.2 mm,出膜前鱼体长度与卵膜直径相当,在卵膜内能够伸直鱼体自由游动,这与其他鳅科鱼类以及多数鲤科鱼类有所不同.