水生生物学报2026，Vol.50Issue(4)：1-11,11.DOI:10.3724/1000-3207.2025.2025.0366
雅砻江特有鱼类修长叶须鱼生长与种群资源评估
A COMPREHENSIVE STUDY ON THE GROWTH AND POPULATION DYNAMICS OF ENDEMIC FISH PTYCHOBARBUS LEPTOSOMUS IN THE YALONG RIVER
摘要
Abstract
Ptychobarbus leptosomus is a newly identified endemic fish species distributed in the mid-upper Yalong River drainage on the Qinghai-Xizang Plateau,yet its basic biology and population status remain scarcely documented.This study combined growth characteristics and population dynamic analyses to elucidate its adaption to the plateau environment and assess current resource status,thereby providing a scientific basis for effective conservation measures.A total of 111 specimens were collected from the mid-upper Yalong River during 2022 to 2024.Based on biometric data including body length,body weight,age,and gonadal developmental stage,key growth parameters were derived.Population dynamics and resource status were assessed through biological reference points,a yield-per-recruit(YPR)model,and spawning potential ratio(SPR)model.The length-weight relationship showed isometric growth in both females(b=3.0218)and males(b=3.0491),with no significant deviation from 3.Growth coefficients(k)were low(0.0574 for females,0.0687 for males),reflecting slow growth typical of plateau-adapted fishes.The estimated length and age at first sexual maturity were 33.79 cm and 8.518 years for females,and 32.14 cm and 7.451 years for males.Age at first capture peaked at 7.09 years for females and 5.83 years for males.Total mortality(Z)was estimated at 0.482/a for females and 0.460/a for males.Critically,SPR values ranged between 0.35-0.43 for females and 0.30-0.39 for males,both well below the F25%reference point,indicating severe overexploitation.The above results showed that P.leptosomus exhibits a long life span,slow growth,and late sexual maturity,and that its population is under heavy fishing pressure.Urgent targeted protection measures are needed to promote resource recovery and ensure popu-lation persistence.关键词
生长特征/种群资源现状/雅砻江/修长叶须鱼Key words
Growth characteristics/Population resource status/Yalong River/Ptychobarbus leptosomus分类
农业科技引用本文复制引用
罗文杰,李鑫,付其鹏,黄俊杰,唐子婷,杨德英,何智,严太明,宋以兴,刘飞,曾如奎,丁文祥,田潘,文磷,李轲,郑旭彬..雅砻江特有鱼类修长叶须鱼生长与种群资源评估[J].水生生物学报,2026,50(4):1-11,11.基金项目
雅砻江流域水电开发有限公司资助科研项目(YLGZ-LHDA-ZD2022257) （YLGZ-LHDA-ZD2022257）
国家自然科学基金(31972777)资助[Supported by Yalong River Hydropower Development Company Limited(YLGZ-LHDA-ZD2022257) （31972777）
the National Natural Science Foundation of China(31972777)] （31972777）
