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首页> 外文期刊>Neotropical Ichthyology >Parasitism by argulids (Crustacea: Branchiura) in piranhas (Osteichthyes: Serrasalmidae) captured in the Cai?ara bays, upper Paraguay River, Pantanal, Mato Grosso state, Brazil
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Parasitism by argulids (Crustacea: Branchiura) in piranhas (Osteichthyes: Serrasalmidae) captured in the Cai?ara bays, upper Paraguay River, Pantanal, Mato Grosso state, Brazil

机译：在巴西马托格罗索州潘塔纳尔邦巴拉河上游的Cai？ara海湾捕获的食人鱼（食蟹鱼：Serrasalmidae）中的食蟹类（甲壳纲：Branchiura）寄生

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摘要

In this study, 446 fishes were analyzed: 190 Pygocentrus nattereri, 193 Serrasalmus maculatus, and 63 S. marginatus.They were captured in two bays, upper and lower Cai?ara, in the upper Paraguay River basin, during one hydrological cycle from May 2008 to April 2009. Six species of Branchiura were found: Dolops bidentata, D. longicauda, Dolops sp., Argulus multicolor, A. chicomendesi, and Dipteropeltis hirundo. All fish species were infested by more than one species of Branchiura and the overall prevalence was 33.4%. The following prevalences were observed: 52.6% in P. nattereri; 20.3% in S. maculatus, and 15.8% in S. marginatus. The relative condition factor (Kn) differed significantly between parasitized and non parasitized individuals only in P. nattereri and S. maculatus. There was no correlation between Kn and abundance of parasites nor between body length (Ls) and intensity of infestation, in all three host species.
机译：在这项研究中，分析了446条鱼：190尾y，193尾斑拉鱼和63尾缘鱼。它们从5月开始的一个水文周期被捕获在巴拉圭河上游凯阿拉上和下两个海湾中。 2008年至2009年4月。发现了6种Branchiura：Dolops bidentata，D.longicauda，Dolops sp。，多色Argulus，A。chicomendesi和Dipteropeltis hirundo。所有鱼类均受到不止一种分支杆菌的侵扰，总流行率为33.4％。观察到以下患病率：在P. nattereri中为52.6％;黄斑链球菌为20.3％，边缘链球菌为15.8％。仅在P. nattereri和S. maculatus中，寄生和未寄生的个体之间的相对条件因子（Kn）显着不同。在所有三种寄主物种中，Kn与寄生虫的丰度之间，体长（Ls）与侵染强度之间均无相关性。

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