"red tide." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/red-tide>.
red tide. (n.d.). Retrieved October 15th, 2018, from http://www.yourdictionary.com/red-tide
A bloom of plankton, especially dinoflagellates, that causes a usually reddish discoloration of coastal ocean waters. Certain dinoflagellates produce toxins that contaminate shellfish, making them unsafe to eat, and can kill fish.