I know this isn't much, but the fish is so small it can fit through the teeth of other fish that are bigger than it in the rock pool. Also the fish has gills which allows it to swim far down in the water and stay in the water because one of its predators (the seagull) can't go in the water. Lastly, the fishes scales tend to be dark green so they can camouflage. But say the fish is a florescent color then because its small it can squeeze into small rock gaps.
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they have dark colors to blend in with rocks so predators won't find them easily