独龙江流域鰋鮡鱼类分布特征及其体长与体重的关系

鰋鮡鱼类主要分布于青藏高原周边，是一群适合于急流生活的鮡科鱼类。在独龙江流域7个点共采集271号鰋鮡鱼类标本（隶属鮡属、鰋属和异齿鰋属），结合各采集点数据绘制大鳍异齿鰋、藏鰋和扁头鮡的分布直方图，结果显示，藏鰋（E．labiatum）在流速较快的独龙江下游各采集点的种群数量较上游高，更适应急流生境。同时研究了这3种鰋鮡鱼类的体长与体重的关系，参数b（W=aL^b）的范围在2．8201和3．0131之间，均为异速生长；藏鰋的生长类型最接近等速生长.

Distribution and Length-weight Relationships of Glyptosternoid Fishes in the Drung River Basin, Yunnan

Glyptosternoid fishes are a group of sisorid catfishes living in torrents of rivers mainly originating from the Qinghai-Tibet Plateau. Based on our survey in the Drung River Basin, seven collecting sites were investigated and 271 glyptosternoid fishes caught belong to three species (Pareuchiloglanis kamengensis, Exostoma labiatum and Oreoglanis macropterus). Features of the distribution of the three catfishes were assessed. More individuals of E. labiatum were caught in the lower reaches of the Drung River with fast water velocity and it might be more adapted to a torrent habitat. The relationships between standard length (L) and weight (W) for P. kamengensis, E. labiatum and O. macropterus were also studied, and the parameter b of the L-W relationship (W=aLb) ranged between 2.8201 and 3.0131. From the present study, all the three catfish species grow allometrically and the growth type of E. labiatum is the closest to a symmetrical one.