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首页> 外文期刊>Aquaculture and Fisheries >A newly developed soft-type turtle releasing device (Soft-TRD) for setnet fisheries
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A newly developed soft-type turtle releasing device (Soft-TRD) for setnet fisheries

机译：用于SetNet渔业的新开发的软型龟释放装置（软盘）

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This study investigated a newly developed soft-type turtle releasing device (Soft-TRD) for setnets. Some setnet fish chambers (bag nets) are open at the sea surface, while others are closed (with ceiling netting) and submerged. Sea turtles that stray into submerged bag nets often drown because the ceiling netting prevents them from swimming up to the surface to breathe. The Soft-TRD has a slit that functions as an escape outlet at the center of a 2?m?×?2?m netting. The escape slit remains closed, due to the buoyancy of a float attached at each end of the slit, and prevents fish from getting out. Turtles can push the escape slit upward, which opens and allows the turtles to escape. To decide the optimum design of the Soft-TRD, a turtle releasing trial was conducted in an outdoor water tank. Four loggerhead turtles ( Caretta caretta ) (standard carapace length (SCL): 67.1–72.8?cm) and five green turtles ( Chelonia mydas ) (SCL: 42.4–63.4?cm) were used for the trial. A single turtle was placed into the experimental bag net where the Soft-TRD (six models in total) was mounted at the center part of the ceiling, and its behavior was observed. All turtles successfully escaped the model with a 150?cm length escape slit, 10?cm overlaying width, and a 4?kgf buoyancy float at each end. The escape slit immediately closed after the turtles escaped. A sea trial (same model) was also performed using a submerged bag net (30?×?10?×?10?m) for two months. Approximately 90% (seven of the eight) of the entrapped loggerhead turtles successfully escaped out through the Soft-TRD. Fishing was not interrupted by the introduction of this device. The use of the Soft-TRD would be helpful in releasing sea turtles from the setnets and contribute to sea turtle conservation efforts.
机译：本研究调查了用于Setnets的新开发的软型龟释放装置（软盘）。一些Setnet鱼室（袋网）在海面上敞开，而其他物品封闭（带天花板网）并淹没。海龟流入浸没的袋网常被淹死，因为天花板网可以防止他们游泳到呼吸。软交流的狭缝有一个狭缝，其用作2？m的中心的逃逸插座？×2？m网。由于在狭缝的每一端附着的浮子的浮力，逃逸狭缝仍然关闭，并防止鱼类从出去脱离。乌龟可以向上推逃逸狭缝，打开并允许乌龟逃脱。要决定软盘的最佳设计，在室外水箱中进行了一种龟释放试验。四个龟头龟（Caretta Caretta）（标准甲状腺长度（SCL）：67.1-72.8？cm）和五个绿色乌龟（Chelonia Mydas）（SCL：42.4-63.4？cm）用于试验。将一个乌龟放入实验袋网中，其中软 - Trd（总共六种型号）安装在天花板的中心部分，并且观察到其行为。所有海龟都成功地逃脱了150？CM长度的档案，10？CM覆盖宽度，4？KGF浮力在每一端浮动。乌龟逃脱后，逃逸缝就立即关闭。也使用浸没式袋网（30Ω×10？10？×10？10）进行海洋试验（相同的型号）。大约90％（八个）的夹带凸起的龟龟成功通过软盘逃脱。捕鱼不会被这款设备的引入中断。使用软盘的使用将有助于从Setnets释放海龟并有助于海龟保护努力。

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