What distinguishes fish from all the other animal classes? Fish are a class of aquatic vertebrates. The combination of gills, fins and the fact that they live only in the water make fish different from all other animals. Fish spend all of their lives in the water and are cold-blooded with the exception of Tuna family and the Mackerel shark family. Scientists believe there are more than 24,000 different species of fish in the world!
In today's Exploring Under Water, learn about one of the most unique fish in the entire ocean...the Lionfish. Have a great day!
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