Several species of fish have been known to do this bizarre phenomena. The fish that have been known to do so include, clownfish, wrasses, and moray eels. Researchers have still not determined the exact process of how it works, but in the absence of a male or female (depending on the fish and the need) one of these specific fish will change in size, color, and most importantly sex organs in a few weeks or even months. For example, the blue-streaked cleaner wrasse usually live in a group of one male and a few females (known as a harem). When the male of this group dies the largest female will assume his role and change sex so they can continue to reproduce.
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