Post-release behaviors and movements of cultured and wild Japanese eels (Anguilla japonica) in a shallow brackish water lagoon in northeastern Japan
Post-release behaviors and movements of cultured and wild Japanese eels (Anguilla japonica) in a shallow brackish water lagoon in northeastern Japan
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DOI：
10.1007/s10641-019-00917-z
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发表时间：
2019-12-01
影响因子：
1.4
通讯作者：
Arai, Nobuaki
中科院分区：
文献类型：
--
作者：
Noda, Takuji;Wada, Toshihiro;Arai, Nobuaki
分别于2014年6月和2014年7月至10月在日本东北部的浅水咸水湖采集了30尾养殖鳗鱼和6尾野生鳗鱼(622.2 mm全长和133.1 mm全长)，并用声接收器监测它们放流后的活动。我们发现，养殖和野生鳗鱼具有一些共同的特征，如夜间活动和利用广泛的微咸水环境，偶尔在晚上从泻湖河流远足。然而，养殖鳗鱼和野生鳗鱼的总检测周期和出海行为不同，在6个月内没有检测到26条养殖鳗鱼，而在6个月内检测到4条野生鳗鱼。与野生鳗鱼相反，共有12条养殖鳗鱼在台风过后的10月份和水温下降(13.8+/-1.2摄氏度)后的11月份进入外海(可能是向海中迁徙)。虽然养殖的鳗鱼在向海移动后对繁殖的贡献尚不清楚，但这些发现表明，它们只在泻湖停留了有限的时间。
A total of 30 cultured [610.6 +/- 24.0 mm total length (TL)] and six wild Japanese eels Anguilla japonica collected on site (622.2 +/- 133.1 mm TL) were tagged with acoustic transmitters and released into a shallow brackish water lagoon in northeastern Japan in June 2014 and July-October 2014, respectively; their post-release movements in the entire lagoon were monitored by acoustic receivers. We found that the cultured and wild eels had some common features, such as nocturnal activity and the exploitation of a wide range of brackish environments and occasionally river excursions at night from the lagoon. However, the total periods of detection and seaward movement behaviors differed between the cultured and wild eels, with 26 cultured eels no longer being detected within 6 months, whereas four wild eels were detected for >6 months. In total, 12 cultured eels moved into the outer ocean (potentially seaward migration) in October after typhoons passed and in November after the water temperature decreased (13.8 +/- 1.2 degrees C), as opposed to the wild eels. While the contribution of the cultured eels to reproduction after the seaward movement remains unknown, these findings showed that they remained in the lagoon only for a limited time.