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根据2007—2010年间2次科学观察员对热带大西洋公海海域(05°37′N～14°59′N,29°00′W～40°54′W)金枪鱼延绳钓渔业的调查,共投钩236次(d),兼捕到棱皮龟和太平洋丽龟2种共23尾,其中死亡8尾,兼捕率为0.03461尾/千钩(0.09746尾/次),上钩后死亡率为34.8%。兼捕海龟的位置范围为06°N～12°N,29°W～38°W。从海龟的钓获部位看,喙部占43.5%;前肢占26.1%;躯干占8.7%;喉部占8.7%;被主绳缠绕占13.0%。此外分析了不同钩深与兼捕海龟数量之间的关系,探讨了影响兼捕率和上钩后死亡率的因素,提出相关保护对策。
According to a survey conducted by two scientific observers from 2007 to 2010 on the longline fishing of tuna in the high seas of the tropical Atlantic (05 ° 37’N to 14 ° 59’N, 29 ° 00’W to 40 ° 54’W), (D). The total number of bycatch was 23, including 8 leatherback turtles and Pacific Rattlesnake, of which 8 were killed. The by-catch rate was 0.03461 hamster per kilogram (0.09746 hamstring per second) . Incontinent turtles range in position from 06 ° N to 12 ° N and from 29 ° W to 38 ° W. From the turtle ’s capture site, the beak accounts for 43.5%; the forelimb accounts for 26.1%; the trunk accounts for 8.7%; the throat accounts for 8.7%; the main rope entwines 13.0%. In addition, the relationship between different hook depths and the numbers of bycatch turtles was analyzed. The factors influencing the bycatch rate and the post mortem rate were discussed, and the related protection measures were proposed.