2. What Is a Fish? Fishes come in an amazing variety of shapes and colors, but they all have three important things in common: All fishes live in water, have fins, and use gills to get oxygen from the water. We have also included a few sea creatures -- some jellyfish and octopods -- in this category.
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5. HABITS Clownfish belong to a group of small, brightly colored fish called damselfish. These inshore reef dwellers have developed a curious and potentially deadly relationship with the sea anemone.
