Riley and Steve meet a fish called the Sandager’s Wrasse that starts out life as a girl and then can turn into a boy later on.

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An animal or plant that survives by taking advantage of another animal or plant. Parasites may harm their victims, but they do not usually kill them.

The pair of fins on each side, just behind a fish's head. Pectoral fins help to control an animals direction while moving in the water.