西藏噶尔藏布流域鱼类群落结构及土著鱼类生长特征

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中图分类号：Q958 文献标志码：A 文章编号：1004—6755（2025）05-0025—05

DOI：10.3969/j.issn.1004-6755.2025.05.005

Abstract：Fish resource surveys were conducted in August—September of 202l and 2023 in the Gar River to study the structure of fish communities and growth characteristics of indigenous fishes and to providea scientific basis for theconservation of local fish biodiversityand the promotion of sustainable utilization of resources.The results showed that four species of indigenous fishes belonging to one order，two families and three genera were detected in both surveys.And two species of invasive fishes were investigatedin2O23.Theanalysis of fish ecotypes rvealed a high percentage of omnivorous fish and benthic fish in the Gar River，both accounting for 66.67% of the total. Biodiversity indices showed that the diversity indices of all three fish species in the Gar River were low，with D values always ranging between 0～1.25 ， H′ between 0～1.34 ，and J values between 0～1 in each sampling period. The regression fiting equations for body length and weight of indigenous fishes showed that Triplophysa stenura， Ptychobarbus conirostris， were negative anisotropic growth types， Gymnocypris firmispinatus，was a uniform growth type，and Triplophysa tibetana， was a positive anisotropic growth type.The Fultons state index （K）offish showed that the mean K value of the fourfish species varied from 0.95 to1.22.The ABCcurves indicated that the fish community in the area was ina stable state and thatcontinued monitoring of exotic species and river connectivity restoration studies are necessary for follow一up.

Key words： Tibetan rivers; fishes; community structure;indigenous fishes; growth characteristics

鱼类是水生生态系统中的重要组成部分，在水生食物网中占有较高的地位[1]。（剩余5799字）