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Bigeye thresher shark Alopias superciliosus movements and post-release survivorship following capture on linked buoy gear
Fisheries Research ( IF 2.4 ) Pub Date : 2021-01-02 , DOI: 10.1016/j.fishres.2020.105857
Scott A. Aalbers , Michael Wang , Charles Villafana , Chugey A. Sepulveda

Off the US west coast, fishery development efforts have led to the recent recommendation for authorization of deep-set buoy gear (DSBG) and linked buoy gear (LBG), two commercial gear types for targeting swordfish at depth during the day. Because the new deep-set configurations interact with bigeye thresher sharks (Alopias superciliosus), a large pelagic species that is not typically retained for sale, this work has focused on documenting the fate of released catch. Bigeye thresher sharks (BETS) were captured and outfitted with pop-up satellite archival tags (Wildlife Computers sPATs and miniPATs) to assess movement trends and acute (30-d) post-release survival during exempted fishing trials authorized by National Marine Fisheries Service (NMFS) and the Pacific Fisheries Management Council (PFMC). Post-release survivorship was based on 14 BETS (∼157−230 cm LF) caught on LBG between August 2016 and December 2019 following fight times ranging from 17−300 min. Thirteen BETS survived the acute effects of capture, and one immediate mortality was documented following heavy entanglement in the monofilament leader. BETS were resilient to the acute effects of handling stress following capture on LBG, with an observed post-release survival rate of 93 %. Surviving BETS exhibited consistent diurnal dive patterns with sharks remaining well below the thermocline during the daytime (mean = 386 ± 62 m) and within the mixed layer at night (mean = 65 ± 25 m). With the exception of one tag that reported within close proximity of the SCB tagging location, BETS exhibited extensive southward movements (mean = 1235 ± 235 km) towards a potentially relevant migratory corridor for large pelagic sharks.



中文翻译:

大眼脱粒机鲨鱼Alopias superciliosus运动和释放后的存活率

在美国西海岸以外,渔业发展的努力已导致最近建议授权使用深浮标渔具(DSBG)和连环浮标渔具(LBG),这两种商业渔具是白天用于深水箭鱼的。因为新的深层配置与大眼脱粒机鲨鱼(Alopias superciliosus),这是一个大型远洋鱼类,通常不保留出售,这项工作的重点是记录释放渔获物的命运。在美国国家海洋渔业局(National Marine Fisheries Service)(National Marine Fisheries Service)授权的免税捕捞试验中,大眼长鼻鲨(BETS)被捕获并配备了弹出式卫星档案标签(Wildlife Computers sPAT和miniPAT),以评估运动趋势和急性(30 d)释放后存活。 NMFS)和太平洋渔业管理委员会(PFMC)。释放后的生存时间基于14个BETS(〜157−230 cm L F)在17至300分钟的战斗时间后于2016年8月至2019年12月在LBG上被抓获。有13个BETS幸免于捕获的急性影响,单丝前导器严重纠缠后有1个立即死亡。在捕获到LBG之后,BETS可以抵抗处理压力的急性影响,观察到的释放后存活率为93%。幸存的BETS表现出一致的昼夜潜水模式,白天鲨鱼保持在比温跃层低得多的位置(平均值= 386±62 m),而晚上则保持在混合层内(平均值= 65±25 m)。除了在SCB标记位置附近报告的一个标记外,BETS朝着可能与大中上层鲨鱼有关的迁徙走廊向南移动(平均= 1235±235 km)。

更新日期:2021-01-04
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