Instead of having the normal type of pelvic fins (below), this fish has evolved disc-like fins and use them to adhere to the substrate.

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Lumpsucker

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Pronghorn Spiny Lobster

Clownfish hatch near the surface and travel deeper to search for a host anemone when they reach their juvenile stage. Within a clownfish community there is a strict hierarchy where juveniles begin at the bottom and have to gradually move upwards by proving their abilities to the rest of the population. During this time they may be victims to agression, and possibly eviction from the anemone by more mature clownfish.