对2012年2-12月用地笼在嘉陵江中游捕获的154尾（♀82，♂72）黑尾，参照《内陆水域渔业自然资源调查手册》中的研究方法进行了生物学的初步研究。嘉陵江中游目前渔获的黑尾体长39．99～70．07mm，体质量1．23～7．79 g。可分为4个年龄组，以2龄个体为主。生长以3龄为分界，3龄前生长速度快，3龄后生长速度减慢。体长与体质量呈幂函数关系：m＝0．00001123 L3．168（r2＝0．938）。雌鱼的Fulton肥满度随年龄的增加而增大；而Clark肥满度雌鱼2龄时达到最大，雄鱼3龄时达到最大，之后随年龄的增加而下降。雌、雄性比为1．14∶1。雌、雄鱼最小性成熟年龄均为2龄。绝对繁殖力为57～106粒/尾，平均83．67粒/尾。分批产卵。4月下旬至5月下旬为产卵盛期。产卵场为底质为砂、砾石的流水滩。以水生昆虫及其幼虫、虾、鱼卵、小鱼和螺为食，生殖季节不停食。%This article reports the biology of Liobagrus nigricauda Regan collected in the middle reaches of Jialing River ,Sichuan Province ,from February to December in 2012 .The fish had body length (L) of 39 .99-70 .07 mm ,and body weight (m) 1 .23-7 .79 g .The fish was divided into 4 age groups ,with the dominant 2 years old group .The dividing line for growth was 3 age ,before 3 ,the growth speed was fast , and after 3 the growth was slow down .The function between body length and body weight was expressed as m= 0 .00001123L3 .168 (r2 = 0 .938) . The Fulton condition factor for female was increased with the increase in age ,but the age of largest Clark condifion factor for female and male was 2 (♀) and 3(♂) , respectively .The total sex ratio (♀ ∶ ♂) of the population was 1 .14 ∶ 1 . The female and male L . nigricauda had sexual maturity at two years old .The absolute fecundity was ranged from 57 eggs to 106 eggs per female ,with the mean value of 83 .67 .The fish spawned in batch ,and the prosperous spawning was observed from the end of April to the end of May ,and the spawning ground is beach land with running water at sand and gravel bottom . L . nigricauda fed mainly on the aquatic insects and their larvae , shrimp ,small fish and snail ,and fasted during the spaw ning season .
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