半鹹水又稱為半海水或鹹淡水，指的是鹽度介於淡水與海水之間的水域，大多見於河海交匯處。在汽水域生活的魚類大多對滲透壓有很強的適應能力，能夠忍受漲潮、退潮帶來的鹽度波動，甚至可以在純淡水或純海水中存活一段時間。
延伸閱讀
- 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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