Abstract Removal of target catch from longlines by marine mammals, known as depredation, is a global issue creating animal welfare, socioeconomic and management concerns. The killer whale (Orcinus orca) is a key species of concern for longline depredation due to their global presence and ability to remove large quantities of caught fish. Currently, data on whale behaviours around fishing vessels, including timing of depredation and ability to follow vessels, is not completely understood. This lack of knowledge prevents a complete assessment of depredation both spatially and temporally, which is important to reduce the chance of underestimating depredation events. Our study utilised both photo-identification and acoustics as complementary approaches to investigate depredation on the blue-eye trevalla (Hyperoglyphe antarctica) demersal longline fishery in Australia. Of the 14 d when depredations were recorded acoustic detection of killer whales prior to visual confirmations occurred in 13 (93 %). Photo-identification revealed individuals repeatedly interacting with the vessel, sometimes over long distances (>1000 km), with increasing inter-depredation times as the vessel travelled further. These findings suggest that killer whales move to known fishing areas well before detection from surface monitoring occurs. While this study has revealed aspects of killer whale behaviours when encountering and interacting with longline fisheries, it has highlighted how traditional monitoring methods underestimate depredation and that this aspect needs to be further investigated.

中文翻译：

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当与澳大利亚东南部的延绳钓渔业互动时，声学和照片识别为虎鲸的存在和运动提供了新的见解

摘要 海洋哺乳动物从延绳钓中去除目标渔获物，称为掠夺，是一个全球性问题，引起动物福利、社会经济和管理问题。虎鲸 (Orcinus orca) 是延绳钓捕食的关键物种，因为它们遍布全球，并且能够清除大量捕获的鱼。目前，尚未完全了解有关渔船周围鲸鱼行为的数据，包括捕食时间和跟随船只的能力。这种知识的缺乏阻碍了对空间和时间上的掠夺的完整评估，这对于减少低估掠夺事件的机会很重要。我们的研究利用照片识别和声学作为补充方法来调查澳大利亚蓝眼鲢（Hyperoglyphe antarctica）底层延绳钓渔业的捕食情况。在记录掠夺的 14 天中，有 13 天（93 %）在目视确认之前对虎鲸进行了声学检测。照片识别显示个人反复与船只互动，有时是长距离（> 1000 公里），随着船只进一步航行，相互掠夺时间增加。这些发现表明，虎鲸在水面监测发现之前就已经迁移到了已知的捕捞区。虽然这项研究揭示了虎鲸在遇到延绳钓渔业并与之互动时的行为，