Environmental factors affecting the onset of spawning migrations of Japanese eels (Anguilla japonica) in Mikawa Bay Japan
Environmental factors affecting the onset of spawning migrations of Japanese eels (Anguilla japonica) in Mikawa Bay Japan
复制标题
影响日本三河湾日本鳗鱼（Anguilla japonica）产卵洄游的环境因素
DOI：
10.1007/s10641-017-0575-4
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Michael J. Miller and Katsumi Tsukamoto
中科院分区：
文献类型：
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作者：
Sudo Ryusuke;Akihiro Okamura;Nobuto Fukuda;Michael J. Miller and Katsumi Tsukamoto
使用各种类型的数据研究了鳗鱼向下游洄游的时间与河流环境因素的关系。对于影响银鳗何时离开河口进入大海的因素，以及生活在咸水沿海地区的鳗鱼产卵洄游的开始，人们知之甚少。对日本三河湾海岸线设置网捕捞日本鳗鲡 (Anguilla japonica) 的时间进行了分析，与 1997 年至 2006 年 10 年间的水温、月相、降雨量和风速等环境变量相关。11 月和 12 月新月期间，海湾水温下降，性腺体指数值 鳗鱼最高。阐明鳗鱼捕获量与环境因素（月相、降雨和风）之间关系的跨栏模型分析表明，鳗鱼捕获量与两天前风力和月相周期这两个不同的环境因素相关，而模型没有选择降雨量。这表明，与鳗鱼在淡水中下游迁徙相比，不同的因素对于确定鳗鱼在沿海水域迁徙的时间很重要。
The timing of downstream migrations of anguillid silver eels in relation to environmental factors in rivers has been examined using various types of data. Less is known about the factors that affect when silver eels leave estuaries and enter the sea or about the onset of the spawning migrations of eels living in brackish-water coastal areas. The timing of collections of Japanese eels,Anguilla japonica, in shoreline set nets in Mikawa Bay, Japan, were analyzed in relation to environmental variables such as water temperature, lunar phase, rainfall and wind speed over a 10 year period from 1997 to 2006. Higher catches of silver eels occurred during new moon periods in November and December as water temperatures decreased in the bay, and when the gonadosomatic index values of the eels were highest. Hurdle model analyses for clarifying the relationship between the catch of eels and environmental factors (lunar cycle, rainfall and wind) indicated the catches of eels were correlated with the two different environmental factors of wind strength 2 days earlier and lunar cycle, while rainfall was not selected by the model. This suggests that different factors are important for determining when eels migrate in coastal waters compared to during their downstream migrations in freshwater.