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Predation dynamics of Rhodeus sinensis on Procambarus clarkii larvae: Behavioral patterns and aquatic plant refuge effects in crayfish aquaculture

文献类型： 外文期刊

作者： Jin, Shiyu 1 ; Gu, Dangen 2 ; Zhang, Tanglin 3 ; Xu, Zhiqiang 4 ; Xu, Yu 4 ; Wang, Meng 5 ; Wang, Qishuo 3 ; Luo, Yan 1 ; Qian, Zhen 1 ; Zhu, Zhengyi 1 ; Zou, Mengmei 1 ; Luo, Si 1 ;

作者机构： 1.Huaiyin Inst Technol, Sch Life Sci & Food Engn, Jiangsu Prov Key Construct Lab Probiot Preparat, Huaian 223003, Peoples R China

2.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Guangzhou 510380, Peoples R China

3.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China

4.Freshwater Fisheries Res Inst Jiangsu Prov, Nanjing 210017, Peoples R China

5.Guiyang Engn Corp Ltd, Power China, Guiyang 550081, Peoples R China

关键词： Predator-prey interactions; Group predation; Refuge effects; Cox proportional hazards regression model; Self-Organizing Map; Bayesian additive regression tree

期刊名称：AQUACULTURE REPORTS （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN： 2352-5134

年卷期： 2024 年 39 卷

页码：

收录情况： SCI

摘要： Non-target fish are frequently present in crayfish aquaculture systems, yet limited research has explored their predatory impacts on crayfish larvae. To address this gap, three experiments were conducted to examine the predation dynamics of Rhodeus sinensis on Procambarus clarkii larvae, focusing on the effects of predator sizes, group sizes, and aquatic plant refuges. In experiment 1, Cox proportional hazards regression model revealed that P. clarkii larvae (8.40 mm and 11.30 mm) faced heightened predation risks from R. sinensis, particularly when the predator's weight exceeded 2 g. Predation mortality significantly rose with increasing predator size. P. clarkii larvae primarily sought refuge in bottom corners and under heating rods, as indicated by Self-Organizing Map. Experiment 2, analyzed with Bayesian Additive Regression Tree, demonstrated that group predation of R. sinensis significantly enhanced predatory efficiency on larger crayfish larvae, resulting in reduced time to the first attack, increased total number of attacks and extended total attack duration. Experiment 3 disclosed that casualty and mortality rates of crayfish larvae markedly decreased when aquatic plants coverage exceeded 20 %, irrespective of plants types. Under predation pressure, crayfish larvae exhibited a preference for microhabitats on and under aquatic plants, indicating an adaptive behavior in response to predation. These findings underscore the susceptibility of P. clarkii larvae to predation by R. sinensis and suggest maintaining a 20 % aquatic plant coverage as an effective management strategy to mitigate predation risks and support juvenile crayfish survival in aquaculture systems.

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