|
|
|
| Biology of Liobagrus nigricauda Regan in the Middle Reaches of Jialing River |
| YANG Jun,GUO Yan-shu,YAN Si-li,ZOU Cheng-kun,ZENG Xiao-qin,YANG Rui-ling |
|
|
|
|
Abstract 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 .
|
|
Received: 25 August 2014
|
|
|
|
|
|
|
