水生生物学报2024，Vol.48Issue(5)：799-807,9.DOI:10.7541/2024.2023.0214
鄱阳湖凶猛性鱼类鲶和乌鳢对克氏原螯虾幼体的捕食选择性研究
THE PREDATION SELECTIVITY OF FEROCIOUS FISH(SILURUS ASOTUS AND CHANNA ARGUS)TO PROCAMBARUS CLARKII LARVAE IN POYANG LAKE
摘要
Abstract
Since the closure of fishing in the Yangtze River,the population of ferocious fish in Poyang Lake has been steadily increasing.In order to investigate whether the Predatory activity of ferocious fish impact the population of Procambarus clarkii,we employed Silurus asotus and Channa argus as predators,using eight different types of bait organisms in this study.Three sizes of P.clarkii larvae(small:39.20±1.30 mm;medium:49.82±2.13 mm;large:58.99±1.16 mm),along with Cyprinus carpio,Carassius auratu,Squaliobarbus curriculus,Mosquitofish,Hypoph-thalmichthys molitrix,Pseudorasbora parva and Macrobrachium nipponense,were used as prey to examine the species selectivity of S.asotus and C.argus and the size selectivity of P.clarkii larvae.The results revealed that:(1)S.asotus and C.argus exhibited a preference for nocturnal predation,with their peak predation occurring between 20:00-8:00;(2)In the presence of various food organisms simultaneously,S.asotus and C.argus did not prey on P.clarkii larvae,displaying clear predation preference for C.carpio,mosquitofish and M.nipponense.(3)When presented with P.clarkii larvae of the same size,S.asotus exhibited a pronounced predation preference for small size P.clarkii larvae,while C.argus preyed significantly more on small-sized P.clarkii larvae than on large-sized ones(P＜0.05).(4)In the equal polyculture combination of various sizes of P.clarkii larvae,both S.asotus and C.argus displayed a clear prefe-rence for small size P.clarkii larvae,and this preference intensified with increasing size gap among the P.clarkii larvae.In summary,when multiple food organisms coexist,P.clarkii is not the preferred prey for ferocious fish,however,when the variety and quantity of other food organisms are limited,smaller-sized P.clarkii larvae remain at a high risk of predation.关键词
鄱阳湖/鲶/乌鳢/饵料生物/克氏原螯虾幼体/捕食选择性Key words
Poyang Lake/Silurus asotus/Channa argus/Prey/Procambarus clarkii larvae/Predatory selectivity分类
生物科学引用本文复制引用
赵明光,陈建华,冯广朋,王海华,张燕萍..鄱阳湖凶猛性鱼类鲶和乌鳢对克氏原螯虾幼体的捕食选择性研究[J].水生生物学报,2024,48(5):799-807,9.基金项目
江西省双千计划(jxsq2020102109)资助[Supported by the Innovative and Entrepreneurial Talents Project of Jiangxi Province(jxsq 2020102109)] （jxsq2020102109）
