Length-weight relationships of six fish species from the Zengqu River and the Ouqu River, southwest China

摘要

This study provides the first report of length-weight relationships (LWRs) for six endemic fish species collected from the Zengqu River and the Ouqu River, two of the tributaries to the upper reaches of the Jinsha River, southwest China. Samples were obtained in May 2013 and September 2013 using various types of fishing gear. A total of 413 specimens belonging to six fish species were analyzed; their LWRs were W = 0.0069L(3.086) (r(2) = 0.987) for Schizothorax wangchiachii (Fang, 1936), W = 0.0076L(3.029) (r(2) = 0.980) for Schizothorax dolichonema (Herzenstein, 1889), W = 0.0029L(3.315) (r(2) = 0.961) for Schizopygopsis malacanthus (Herzenstein, 1891), W = 0.0082L(2.970) (r(2) = 0.950) for Ptychobarbus kaznakovi (Nikolsky, 1903), W = 0.0017L(3.464) (r(2) = 0.957) for Triplophysa stolioczkae (Steindachner, 1866), and W = 0.0037L(3.190) (r(2) = 0.956) for Triplophysa orientalis (Herzenstein, 1888). Prior to this study, the LWRs for S. dolichonema, P. kaznakovi and T. orientalis were unknown. In addition, new maximum sizes for four of the species are provided.