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Individual variation influences avoidance behaviour of invasive common carp (Cyprinus carpio) and native buffalo (Ictiobus) to stroboscopic and acoustic deterrents
Marine and Freshwater Research ( IF 1.8 ) Pub Date : 2021-07-09 , DOI: 10.1071/mf21051
Paul A. Bzonek , Jaewoo Kim , Nicholas E. Mandrak

Uncontrolled biological invasions are reducing freshwater ecosystem diversity and resilience. Research is needed to evaluate whether non-structural deterrents are feasible within lock or canal environments. This study examined common carp (Cyprinus carpio) and buffalo hybrid (Ictiobus) movement patterns in response to acoustic and stroboscopic deterrents. Twelve strobe lights and one underwater speaker were deployed across the centre of a ship slip, with an environment analogous to a navigation canal. Common carp (n = 6) and Ictiobus (n = 4) were implanted with acoustic telemetry tags, and their behaviours were examined under control, stroboscopic, and acoustic stimuli for 60-min trial periods. Trials were run during the day and night for six straight days. Linear models determined that the stroboscopic and acoustic stimuli altered fish positioning within the ship slip, but produced weaker avoidance responses than those observed elsewhere. Weak responses were likely due to a strong preference for the open end of the ship slip and a lack of acoustic refuge during the acoustic treatment. Avoidance responses also differed widely among individuals of the same species, with fish expressing repeatability of avoidance radius size across trials. Ambient and stimulus sound-pressure levels should be carefully considered when deploying acoustic deterrents.



中文翻译:

个体差异影响侵入性鲤鱼(Cyprinus carpio)和本地水牛(Ictiobus)对频闪和声学威慑的回避行为

不受控制的生物入侵正在降低淡水生态系统的多样性和恢复力。需要研究来评估非结构性威慑在船闸或运河环境中是否可行。这项研究检查了鲤鱼 ( Cyprinus carpio ) 和水牛杂种 ( Ictiobus ) 响应声学和频闪威慑的运动模式。十二个频闪灯和一个水下扬声器被部署在一艘船的中心,其环境类似于导航运河。鲤鱼 ( n  = 6) 和Ictiobus ( n = 4) 植入声学遥测标签,并在 60 分钟的试验期内在控制、频闪和声学刺激下检查它们的行为。连续六天白天和晚上进行试验。线性模型确定频闪和声学刺激改变了船滑内鱼的位置,但产生的回避反应比在其他地方观察到的要弱。弱响应可能是由于对船卡开口端的强烈偏好以及在声学处理期间缺乏声学避难所。同一物种的个体之间的回避反应也存在很大差异,鱼类在整个试验中表现出回避半径大小的可重复性。在部署声威慑物时,应仔细考虑环境和刺激声压级。

更新日期:2021-07-13
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