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首页> 外文期刊>ICES Journal of Marine Science >Simulating trawl herding in flatfish: the role of fish length in behaviour and swimming characteristics
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Simulating trawl herding in flatfish: the role of fish length in behaviour and swimming characteristics

机译：模拟比目鱼拖网成群：鱼的长度在行为和游泳特征中的作用

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Theoretical modeling indicates that the herding efficiency of flatfish by bottom-trawl sweeps is highly sensitive to subtle changes in fish behaviour. Yet the degree of variation in herding behaviour within a species, population, or individual remains poorly understood because of the difficulty observing and measuring fish behaviour in this region of the gear. The purpose of this study was to simulate herding under laboratory conditions in order to examine the behaviour and swimming characteristics of flatfish. Using a large flume equipped with a moving floor, we examined the effect of fish length on gait use, behaviour, and swimming kinematics in American plaice (Hippoglossoides platessoides). While swimming at a speed comparable to the herding speed of trawl sweeps (0.3 m s~(-1)), smaller plaice (<30 cm) spent a large percentage of time using the kick-swim gait, while larger fish ( ≥ 30 cm) preferred cruising. In total, 65% of plaice exhibited settling behaviour, analogous to the swim-and-settle behaviour observed in response to trawl sweeps. The frequency of this behaviour and the distance swum between settles were independent offish length. Only the frequency of gliding changed with the duration of swimming. Like other teleost species, tailbeat frequency decreased with increasing fish length. The results from this study indicate that fish length affects gait use and swimming kinematics in flatfish, but not the frequency of gliding and settling behaviours. These observations support the hypothesis of size-selective herding and provide further insight into the herding efficiency of trawl sweeps.
机译：理论模型表明，底拖网扫查比目鱼的放牧效率对鱼类行为的细微变化高度敏感。然而，由于难以观察和测量渔具在该区域内的鱼类行为，因此对物种，种群或个体内的放牧行为的变化程度仍然知之甚少。这项研究的目的是在实验室条件下模拟放牧，以检查比目鱼的行为和游泳特性。我们使用装有活动地板的大型水槽，检查了鱼长对美洲（Hippoglossoides platesoides）的步态使用，行为和游泳运动学的影响。在以与拖网扫群速度（0.3 ms〜（-1））相当的速度游泳时，较小的（<30 cm）会花很多时间使用脚步游泳步态，而较大的鱼（≥30 cm） ）首选巡航。总的来说，有65％的表现出沉降行为，类似于对拖网扫掠观察到的游泳和沉降行为。这种行为的频率和定居点之间的游动距离与鱼类的长度无关。只有滑行的频率随着游泳的持续时间而改变。像其他硬骨鱼类一样，尾巴频率随着鱼长的增加而降低。这项研究的结果表明，鱼类长度会影响比目鱼的步态使用和游泳运动学，但不会影响滑行和沉降行为的频率。这些观察结果支持了大小选择性放牧的假说，并进一步了解了拖网扫除的放牧效率。

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