半咸水又称为半海水或咸淡水，指的是盐度介于淡水与海水之间的水域，大多见于河海交汇处。在汽水域生活的鱼类大多对渗透压有很强的适应能力，能够忍受涨潮、退潮带来的盐度波动，甚至可以在纯淡水或纯海水中存活一段时间。
延伸阅读
- Moustakas, A.; Karakassis, I. How diverse is aquatic biodiversity research?. Aquatic Ecology. 2005-09, 39: 367–375 [2021-01-03] （英语）.
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