Salinity and odor preferences of Japanese eel during the first year of post-recruitment growth in saline water
Salinity and odor preferences of Japanese eel during the first year of post-recruitment growth in saline water
复制标题
日本鳗鱼在盐水中生长后第一年的盐度和气味偏好
DOI：
10.1007/s10164-018-0572-x
复制
发表时间：
2018
影响因子：
0.9
通讯作者：
T. Yada
中科院分区：
文献类型：
--
作者：
N. Fukuda;K. Yokouchi;Toshihiro Yamamoto;H. Kurogi;T. Yada
淡水鳗鱼既生长在河口，在近岸的盐水沃茨中度过黄鳗阶段，也生长在河流中的淡水中。为了了解日本鳗鱼之间的河口和河流的住宅分歧，我们调查了他们的水的喜好在第一年的盐水中的增长后，他们的招聘到增长的栖息地，通过使用Y-迷宫行为试验。在天然海水和河水的水选择试验中，玻璃鳗和色素仔鳗表现出对河水的显著偏好，而小黄鳗表现出对海水的显著偏好。随后的实验研究气味和盐度的鳗鱼偏好表明，河流气味的偏好保持在生长阶段。然而，随着鳗鱼在天然海水中发育到黄鳗阶段，它们的盐度偏好从不偏好或偏好淡水转变为偏好盐水。这些结果表明，日本鳗鱼分散在广泛的盐度，直到幼鳗阶段，只要水有丰富的河流起源的气味。当个体在盐水中生长直到达到黄鳗阶段时，它们很可能成为河口居民。
Freshwater eels grow both as residents of estuaries, spending the yellow eel stage in nearshore saline waters, and as residents of freshwater in rivers. In order to understand how Japanese eels diverge between estuarine and river residence, we investigated their water preferences during the first year of growth in saline water after their recruitment into growth habitats by using Y-maze behavioral trials. In the water-choice trials between natural seawater and river water, glass eels and pigmented elvers showed a significant preference for river water, while small yellow eels showed a significant preference for seawater. Subsequent experiments examining odor and salinity preferences of the eels showed that a preference for riverine odor was maintained during the growth phase. However, as the eels developed into the yellow eel stage in natural seawater, their salinity preference shifted from no preference, or a preference for freshwater, to a preference for saline water. These results suggest that Japanese eels disperse over a wide range of salinities until the elver stage, as long as water has a rich river-originated odor. When individuals grow in saline water until reaching the yellow eel stage, they are likely to become estuary residents.