Fish

=Fish 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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 * All fish have a backbone. ||
 * [[image:http://www.iwrc-online.org/kids/Facts/Fish/images/fishbullet.GIF width="30" height="27"]] || All fish are cold-blooded. ||
 * [[image:http://www.iwrc-online.org/kids/Facts/Fish/images/fishbullet.GIF width="30" height="27"]] || There are three classes of fish: jawless, cartilaginous, and bony.. ||
 * [[image:http://www.iwrc-online.org/kids/Facts/Fish/images/fishbullet.GIF width="30" height="27"]] || Fish have been around for 500 million years. ||
 * [[image:http://www.iwrc-online.org/kids/Facts/Fish/images/fishbullet.GIF width="30" height="27"]] || There are about 25,000 different species of fish alive today. ||
 * [[image:http://www.iwrc-online.org/kids/Facts/Fish/images/fishbullet.GIF width="30" height="27"]] || There are about 20,000 different species of bony fish alive today.

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