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Fish in Nature User Nature fish ChatGPT Fish are a diverse group of aquatic animals that are part of the animal kingdom. They are cold-blooded vertebrates, meaning they have a backbone and regulate their body temperature according to their environment. Fish are primarily found in water bodies such as oceans, rivers, lakes, and streams. There are thousands of different species of fish, ranging from tiny minnows to large predators like sharks. They come in various shapes, sizes, colors, and patterns. Fish are known for their streamlined bodies, which are adapted for swimming efficiently through water. They have fins and tails that enable them to maneuver and propel themselves. Fish have gills, specialized organs that extract oxygen from water, allowing them to respire. This adaptation allows them to extract dissolved oxygen from their aquatic environment. Some species of fish also have a swim bladder, an air-filled organ that helps them control their buoyancy and stay at a particular depth in the water.