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MHS Library | Life Science

Freshwater Fish

Freshwater fish live in lakes, rivers, ponds and streams. Common freshwater fish include carp, bass, trout and catfish.

Saltwater Fish

Saltwater fish are the most beautiful fish in the world. They range from the majestic marlin to the funny-looking flounder, and the goliath grouper to the tiny blenny, and just about everything in between. See full list.

Corals & Jellies

Cnidarians such as jellyfish and corals have stinging cells called nematocysts. When touched they eject barbed threads tipped with poison.


There are more than 52,000 species of Crustaceans in the world which include popular marine animals like lobsters, crabs, shrimp, crayfish and barnacles. Smaller crustacean breathe through their bodies and larger ones breathe through gills.


Mollusks are members of the invertebrate phylum Mollusca and contain more than 100,000 species. Some mollusks have shells like clams and snails, while larger mollusks have no bones at all like the cuttlefish, squid and octopus.

Other Fish

Other Fish covers fish species that are neither fresh or saltwater. Usually these species migrate between fresh and saltwater.

Other Marine Life

Learn about some of the some of the most bizzare marine life under the sea, such as Sea Squirts, sponges and even Sea Monkeys.

Starfish & Organisms

Echinoderms are spiny marine animals such as starfish and sea urchins. Most echinoderms have small jaws, a water-vascular system and tube feet.