Aquarium Fish

The 4-1-1 on Fish

Do you know that aquarium fish are the most popular pet in America? There are more than 108 million pet fish in the United States. Read on to learn how easy it is to become a fish keeper.

Fish belong in the group of animals called vertebrates. This means they have a backbone and an internal skeleton made of bone or cartilage. They breathe under water through their gills, and move around using fins. Fish are cold-blooded animals, meaning their bodies are the same temperature as the water around them.

Fish come in many shapes, sizes and colors. One may choose from thousands of different types of fish.

Some of the more popular types of fish include everything from tetras, barbs and catfish to guppies, mollies and goldfish.