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首页> 外文期刊>Marine biology >Periodic behavior and residence time of yellowfin and bigeye tuna associated with fish aggregating devices around Okinawa Islands, as identified with automated listening stations
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Periodic behavior and residence time of yellowfin and bigeye tuna associated with fish aggregating devices around Okinawa Islands, as identified with automated listening stations

机译：由自动监听站确定的与冲绳群岛周围鱼类聚集设备相关的黄鳍金枪鱼和大眼金枪鱼的周期性行为和停留时间

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In order to better understand the associative behavior of yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) with anchored fish aggregating devices (FADs), we conducted long-term monitoring of these tuna tagged with ultrasonic transmitters, using automated receivers deployed on seven FADs around the Okinawa Islands. Current and surface water temperature were also monitored by data loggers attached to the stations as a way to examine the influence of these factors on the associative behavior of tuna with FADs. We monitored a total of 52 yellowfin and 11 bigeye tuna at monitoring FADs for a period of 2.5 years. We found that the majority of tuna remained continuously at the monitoring stations for a certain period (max.=55 days) without day-scale (>24 h) absences, until they left the stations completely. The residence time at a single FAD was estimated to be about 7 days, as the half-life for both yellowfin and bigeye tuna. No inter-specific differences were seen, though there was a significant difference in residence time between two size classes: the residence time of the larger size class was shorter than that of the smaller size class. We also found there was a periodicity of approximately 24 h and regularity of associative behavior, estimated based on the fluctuation pattern of the detection rate and of short-term (<24 ah) absences. In particular, absences of several hours occurring once a day with high temporal precision were considered to be excursions within several nautical miles from the FADs. These results indicate that tuna express periodic behavior in relation to the FADs and can locate the FADs precisely enough to return to them after a certain time. No relationship was seen between associative behavior and abiotic oceanographic conditions. Therefore, the biological environment (prey availability, the presence of predators, etc.) and the internal state of the individual (hunger, etc.) may be more important than abiotic environmental cues for inducing changes in associative behavior and/or the departure from FADs. In addition, the strong association of tuna with a single FAD and the relatively prolonged residence time observed in the present study may relate to the vigorous activity of FAD fisheries in Okinawa and their utilization of a large amount of bait.
机译：为了更好地了解黄鳍金枪鱼（Thunnus albacares）和大眼金枪鱼（T. obesus）与锚定鱼聚集设备（FADs）的关联行为，我们使用部署有自动接收器的超声波发射器对这些金枪鱼进行了长期监控在冲绳群岛周围的七个FAD上。站上的数据记录仪还监测了当前和地表水的温度，以此来检查这些因素对金枪鱼与FAD的关联行为的影响。我们在监测FADs的过程中共监测了52只黄鳍金枪鱼和11只大眼金枪鱼，为期2.5年。我们发现，大多数金枪鱼在一定时间内（最长= 55天）连续停留在监测站，没有日间规模（> 24小时），直到它们完全离开监测站为止。由于黄鳍金枪鱼和大眼金枪鱼的半衰期，单个FAD的停留时间估计约为7天。没有观察到种间差异，尽管两个尺寸类别之间的停留时间存在显着差异：较大尺寸类别的停留时间短于较小尺寸类别的停留时间。我们还发现，大约有24 h的周期性，并且根据检测率和短期（<24 ah）缺失的波动模式估计了联想行为的规律性。尤其是，每天一次以高时间精度缺席几小时被认为是距FAD数海里的短途旅行。这些结果表明，金枪鱼表现出与FAD相关的周期性行为，并且可以精确定位FAD，以便在一定时间后返回到它们。联想行为和非生物海洋状况之间没有关系。因此，生物环境（猎物的可利用性，掠食者的存在等）和个体的内部状态（饥饿等）可能比非生物环境提示更重要，以引起联想行为的变化和/或偏离。 FADs。此外，金枪鱼与单个FAD的强烈关联以及在本研究中观察到的相对较长的停留时间可能与FAD渔业在冲绳的旺盛活动及其对大量诱饵的利用有关。

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