水生生物学报2025，Vol.49Issue(5)：15-26,12.DOI:10.7541/2025.2024.0288
基于鱼类体长结构分析的鄱阳湖禁渔效果评估
EVALUATION OF FISHING BAN EFFECT IN THE POYANG LAKE BASED ON THE ANALYSIS FISH BODY LENGTH STRUCTURE
摘要
Abstract
Poyang Lake has been under a comprehensive ten-year fishing moratorium since 2020.This study analyzed the changes in three indicators-average body length,Proportional Size Distribution(PSD),and the proportion of se-xually mature individuals-among 25 major fish species in Poyang Lake before the ban(2017-2019)and after the ban(2021-2022).The objective was to evaluate the effects of the fishing ban on population structure of these species.The results showed that after two years of continuous fishing prohibition,the phenomenon of individual dwarfism in major fish species was effectively alleviated,resulting in an increase in the proportion of larger and sexually mature indivi-duals,thus optimizing the population structure.Among the 25 assessed fish species,24 showed an increase in average body length ranging from 2.3％to 115.0％(P＜0.05),with corresponding increases in their PSD values by 3 to 71(P＜0.05).Additionally,the proportion of sexually mature individuals increased by 23.2％to 10712.8％for 20 species.However,one species,Pseudolaubuca sinensis,exhibited a decrease in average body length of 5.0％(P＜0.05)and a decline in PSD value of 21(P＜0.05).For eight fish species(Cyprinus carpio,Xenocypris argentea,Saurogobio dabryi,Coilia brachygnathus,Hemiculter lucidus,Culter alburnu,Acheilognathus macropterus,and Pseudolaubuca sinensis),no significant changes in the Fulton's condition factor were observed.Furthermore,five species(Cyprinus carpio,Parabramis pekinensis,Hemiculter leucisculus,Pseudolaubuca sinensis,and Acheilognathus macropterus)showed a decrease in the proportion of sexually mature individuals,ranging from 23.5％to 79.8％.In the assessment of popula-tion stability status,prior to the fishing ban,21 species were categorized as unstable(PSD＜50 and PSD＞80),while only 4 species were deemed stable(50≤ PSD≤ 80).Following the implementation of the fishing ban,the number of unsta-ble species decreased to 15,whereas the number of stable species increased to 10.In summary,the population structure of the majority of major species in Poyang Lake improved following the fishing ban,although some species showed different changes.It is recommended that the comprehensive fishing ban in Poyang Lake should be sustained,along with continuous and comprehensive monitoring of fish populations,to achieve effective recovery of fishery resources and enhancement of overall ecosystem service functions in Poyang Lake.关键词
体长结构/体长比例分布/禁渔/鱼类种群/鄱阳湖Key words
Population body length structure/Proportional size distribution/Fishing ban/Fish Population/Poyang Lake分类
农业科技引用本文复制引用
邵涵文,鲁文楷,黎明政,刘焕章..基于鱼类体长结构分析的鄱阳湖禁渔效果评估[J].水生生物学报,2025,49(5):15-26,12.基金项目
湖北省重点研发计划(2023BCB039) （2023BCB039）
国家自然科学基金(32201425和32473167)资助[Supported by the Key R & D Plan of Hubei Province(2023BCB039) （32201425和32473167）
the National Natural Science Foundation of China(32201425 and 32473167)] （32201425 and 32473167）
