They also like to have clean sand or gravel beds to spawn. A few other things that are important to fish survival are levels of dissolved oxygen in the water, pH levels, and water temperature. These factors vary from one fish species to another. For example some fish can live in warm water (large mouth bass) where others need to live in cold water (rainbow trout).
Fish like to eat many different things. Some like dead plant and animal matter; others like aquatic bugs, and still others like other fish!
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