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A newly developed soft-type turtle releasing device(Soft-TRD)for setnet fisheries

Aquaculture and Fisheries 2021年第4期6卷 359-366页

作者： Daisuke Shiode Maika Shiozawa Fuxiang Hu Tadashi Tokai Yoshio Hirai Tokyo University of Marine Science and Technology MinatoTokyo108-8477Japan NITTO SEIMO Co. LTD.MinatoTokyo105-0004Japan

This study investigated a newly developed soft-type turtle releasing device(Soft-TRD)for *** setnet fish chambers(bag nets)are open at the sea surface,while others are closed(with ceiling netting)and *** turtles that stray into submerged bag nets often drown because the ceiling netting prevents them from swimming up to the surface to *** Soft-TRD has a slit that functions as an escape outlet at the center of a 2 m×2 m *** escape slit remains closed,due to the buoyancy of a float attached at each end of the slit,and prevents fish from getting *** can push the escape slit upward,which opens and allows the turtles to *** decide the optimum design of the Soft-TRD,a turtle releasing trial was conducted in an outdoor water *** 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 *** turtles successfully escaped the model with a 150 cm length escape slit,10 cm overlaying width,and a 4 kgf buoyancy float at each *** 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 *** 90%(seven of the eight)of the entrapped loggerhead turtles successfully escaped out through the *** was not interrupted by the introduction of this *** use of the Soft-TRD would be helpful in releasing sea turtles from the setnets and contribute to sea turtle conservation efforts.

关键词： Bycatch Push-up Setnet Soft-TRD turtle releasing device turtle releasing system

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