red tide

red-tide的词性：
n.（名词）

1. A bloom of dinoflagellates that causes reddish discoloration of coastal ocean waters. Certain dinoflagellates of the genus Gonyamlax produce toxins that kill fish and contaminate shellfish.
赤潮：由于毒双鞭甲藻的而大量产生使沿岸海水变红，有些膝沟藻属 的双鞭甲藻产生杀死鱼和受污染的贝类毒素