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首页> 外文期刊>Fisheries and Aquatic Sciences >Shaking Motion Characteristics of a Cod-end Caused by an Attached Circular Canvas during Tank Experiments and Sea Trials
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Shaking Motion Characteristics of a Cod-end Caused by an Attached Circular Canvas during Tank Experiments and Sea Trials

机译：在储罐试验和海试期间，由附着的圆形帆布引起的鳕鱼端的振动特性

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A shaking motion could be used to improve fish escapement from a cod-end net by creating a sieving effect over the swept volume or by disturbing the optomotor response of the fish. In this study, a perpendicular shaking motion was generated in a towed cod-end net by a circular canvas attached to the end of the codend, which formed a biased cap-like shape. This concept was tested by using a model in a flow tank and by towing a prototype cod-end during sea trials. For the model tests, the amplitude of the shaking motion was times the rear diameter of the cod-end, and the period of the shaking motion was s at a flow velocity of 0.6 or 0.8 m/s. In the sea trials, the amplitude was times the rear diameter of the cod-end, and the period of the shaking motion was s at towing speeds of 1.2 or 1.7 m/s. Thus, the shaking amplitude during the sea trials was equal to or less than that observed in the tank tests, and the shaking period was twice as long. The shaking motion described by the amplitude and period could be an effective means to stimulate fish escapement from cod-end during fishing operations considering the response of the fish.
机译：摇动动作可用于通过在扫掠范围内产生筛分效果或干扰鱼的光动力反应来改善鱼从鳕鱼端网的逃逸。在这项研究中，拖曳的鳕鱼端网是通过附着在编码端的圆形帆布在拖曳的鳕鱼端网中产生垂直摇动的，该帆布形成了偏斜的帽状形状。通过在储油罐中使用模型并在海试期间拖曳鳕鱼样机原型，对这一概念进行了测试。对于模型测试，摇晃幅度是鳕鱼尾的后直径乘以，摇晃周期在s为0.6或0.8 m / s的情况下为s。在海上试验中，振幅是鳕鱼尾的后部直径乘以，在1.2或1.7 m / s的牵引速度下，摇动的周期为s。因此，海上试验期间的振动幅度等于或小于在坦克试验中观察到的幅度，并且振动时间是其两倍。考虑到鱼类的反应，幅度和周期所描述的摇动动作可能是刺激鱼类在鳕鱼末端逃逸的有效手段。

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