Length-weight relationships for three fish species from the Yalong River, southwestern China

Abstract

SummaryLength-weight relationships were determined for three fish species: Gymnodiptychus pachycheilus (Herzenstein, 1892), Discogobio yunnanensis (Regan, 1907), and Triplophysa pseudostenura (He, Zhang & Song, 2012). Samples were collected from the Yalong River, southwestern China using fishing gear (gillnets, 30 × 15 m, mesh-size 5 mm) and electroshock fishing (CWB-2000 P, 12 V, 250 HZ) in June 2007. Prior to this study, length-weight relationships for these three species were unknown. For two of the species [Discogobio yunnanensis (Regan, 1907) | INTRODUCTIONThe ichthyofauna of southwestern China is extremely diverse (Kang et al., 2014), and the Yalong River is one of its richest water resources with many endemic fish species (Chen, Chen, & He, 2002). However, information on the fishes in this region has been limited to the conservation and management of fishes in the river basin because of recently built hydroelectric power stations on the Yalong River (Dudgeon, 2011). In this study, the length-weight relationships (LWRs) for the three aforementioned fish species were determined. | MATERIALS AND METHODS Specimens | RESULTSSample size, size range, length-weight parameters a and b, and the correlation coefficient (r 2 ) are shown in | DISCUSSIONLWRs of three fish species were determined in this study for the first time. The values of parameter b remained within the expected range of 2.5-3.5 (Froese, 2006). By comparing our results

Length–weight relationships of three fish species from Moyangjiang River, China

“…There are some factors (including seasonal variation, habitat type, population, gonadal maturity, diet etc.) may impact values b (Tang et al, ; Xia, Chen, & Xiong, ). And these three species the sample size is very small and size range cover is relative narrow.…”