What Makes a Fish a Fish?

Answer

A fish is considered a fish when it is cold blooded, it is an aquatic vertebrae, and it has fins. It also has to pass oxygenated water over gills. You can find more information here: http://www.oceansforyouth.org/whats-that/ftr0504.html
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The redtail catfish, or pirarara, is a native fish of the Amazon basin. It's one of the more readily caught large Amazon fishes. Adults weight up to 100 pounds ...
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