云南光唇鱼人工繁殖与苗种培育初步研究

Preliminary Study on Technique for Artificial Reproduction and Fry Rearing of Acrossocheilus yunnanensis

用野生成熟云南光唇鱼（Acrossocheilusyunnanensis）经注射催产激素后进行人工繁殖试验。结果表明：云南光唇鱼在乌江上游繁殖时间为5月，繁殖期水温为14～18℃。试验共催产雌性亲鱼41尾，成功产卵29尾，获卵37．9万粒。云南光唇鱼绝对怀卵量为10965～14389粒，平均13069粒，相对怀卵量29～95粒／g，平均34．8粒／g。受精卵在水温（15．0±0．5）℃，经135～149h孵化出膜，获初孵鱼苗13．9万尾，初孵鱼苗全长8～11mm。选用水蚯蚓作混合营养期开口饵料，采用两步转食法转食，经30d培育，获1．5～2．3cm鱼苗9．3万尾。其催产率、受精率、孵化率、鱼苗培育成活率分别为70．7％、62．1％、58．7％和66．9％。

Breeding experiment was conducted on wild mature Acrossocheilus with hormone oxytocin in advance. The results showed that the reproduction time yunnanensis f asciatus injected for Acrossoeheilus yunnanensis in the upper reaches of Wujiang river is May, with the water temperature being 14--18℃. 41 parent females＂ egg laying process was expedited, and 29 females succeeded in spawning, acquiring 37,9000 eggs. The absolute fecun- dity of Acrossocheilus yunnanensis was 10,965 --14,389, with an average egg and a relative fecundity of 29--95 egg/g,and 34.8 egg/g. The fertilized eggs were hatched in a water temperature of 15 ± 0. 5℃ for 135±149 hours, and 139,000 newly hacthced fries which were 8 --11mm long were obatianed. They were fed with water earthworms as the opening bait in mixed nourishment period with two-step food conversion method. After 30 days, 93,000 fries with an overall length of 1.5--2.3cm were aquried. The parturifacient rate, fertilized rate and hatching rate were 70.7G, 62.1%, and 58.7% respectively. And the fry breeding rate of survival was 66.9%.