Biogeography Branch, National Oceanic and Atmospheric Administration, Silver Spring, MD 20910, USA.
J Fish Biol. 2012 Oct;81(5):1611-25. doi: 10.1111/j.1095-8649.2012.03418.x. Epub 2012 Sep 14.
An underwater video surveillance system known as TrapCam was used to continuously record (15 ×c. 24 h periods) fish behaviour within and immediately surrounding an experimental fish trap situated in a coral reef ecosystem in the United States Virgin Islands. Of the 100 fishes (18 species, 12 families) trapped, surgeonfishes (Acanthuridae) and snappers (Lutjanidae) were most common. Thirteen distinctively identifiable behaviours were observed for trapped fishes. Species did not differ significantly in the proportion of time allocated to different behaviours (ANOSIM, R = 0·142). Doctorfish Acanthurus chirurgus and grey angelfish Pomacanthus arcuatus allocated the largest proportion of their recorded time to enter and exit the trap. Fishes spent an average of 15 min in the trap before escaping. Sixty-seven per cent of trap approaches consisted of an individual of the same species as one already trapped suggesting that conspecific attraction may have occurred. Fifteen per cent of trapped species were observed with abrasions to the head and 70% were observed approaching the trap corners. The results of this study provide a greater understanding of the behavioural interactions between fishes and traps that can help explain patterns of catch composition, the physical condition of fishes in traps and inform design of gear modifications to optimize by-catch reduction in the trap fishery.
一种名为 TrapCam 的水下视频监控系统被用于连续记录（15×约 24 小时周期）美国维尔京群岛珊瑚礁生态系统中一个实验性鱼笼内及其周围的鱼类行为。在捕获的 100 条鱼（18 种，12 科）中，刺尾鱼（刺尾鱼科）和笛鲷（笛鲷科）最为常见。观察到了 13 种可识别的被困鱼类行为。不同物种在分配给不同行为的时间比例上没有显著差异（ANOSIM，R = 0·142）。医生鱼 Acanthurus chirurgus 和灰天使鱼 Pomacanthus arcuatus 将其记录时间的最大比例分配给进出陷阱。鱼类在逃脱前平均在陷阱中停留 15 分钟。67%的陷阱接近是由已经被困的同种个体引起的，这表明可能发生了同种吸引。15%的被困物种观察到头部有擦伤，70%的物种观察到接近陷阱角落。本研究的结果提供了对鱼类与陷阱之间行为相互作用的更深入了解，这有助于解释捕获物组成模式、陷阱中鱼类的身体状况，并为渔具改进设计提供信息，以优化陷阱渔业中的兼捕减少。
