Length-weight relationships and biological data of Odontobutis sinensis (Wu, Chen & Chong, 2002) from Liangzi Lake, China

Abstract

This study provides the first biological information on a small freshwater benthic fish species Odontobutis sinensis (Wu, Chen & Chong, 2002) from Liangzi Lake, China. The length-weight relationship was BW = 0.0080TL 3.23 . The male : female sex ratio was 1.56 : 1. Based on the gonadosomatic index (GSI), the spawning season is from April to June. Females first matured at 7.90 cm total length (TL). Absolute fecundity varied from 346 to 2588 eggs. Main food items consisted of crustaceans and smaller fishes.

Shift towards Opportunistic Life-History of Sleeper in Response to Multi-Decadal Overfishing

“…The data on the age composition, size at age and fecundity of the sleeper population in Honghu Lake which were obtained in this study were compared with the data on avail able historical populations in lakes of the middle Yangtze River, i.e., the population in 1957 in Liangzi Lake [32] and the population in 1993-1994 in Bao'an Lake [33]. Fish size data from Hao [32] were reported in total length; therefore we converted these data to SL using the function TL = 1.133SL + 0.729 (R 2 = 0.98) developed by Cao et al [41]. Growth differences among populations were compared using Analysis of Covariance (ANCOVA) In this model, SL was the dependent variable, log10(age) was an independent variable, and the population was a blocking variable.…”

“…Adults become active and more motile in conjunction with spawning, usually from late March to May [32]. During these months shrimp traps commonly capture sleepers, whereas, during other periods, fishermen rarely capture them [33,41]. The collected individuals in Honghu Lake were all adults with well-developed gonads.…”