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.
- How Coral Reefs WorkHow do coral polyps mere millimeters in length form the world's largest living structures? Will these giants of the sea last much longer if the present rate of destruction continues?
- How Jellyfish WorkAlthough jellyfish have been around for over 650 million years, they're stil very mysterious. Learn the all about the fascinating jellyfish life cycle.
- CoralCoral is a hard material formed in the sea by colonies of tiny animals.
- JellyfishJellyfish are soft-bodied water-dwelling animals.
- Portuguese Man-of-WarThe Portuguese Man-of-War is a floating marine animal found in warm regions of all oceans.
- Sea AnemoneSea Anemone is a marine animal closely related to the corals.
- Baby Coral (Video)Endangered coral is helped by scientists who harvest new, live baby coral.
Crustaceans
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.
- BarnacleA Barnacle is a small saltwater animal with a protective shell-like covering.
- CrabA Crab is a land- or water-dwelling crustacean.
- CrayfishCrayfish are sometimes referred to as crawfish or crawdads.
- CrustaceanA Crustacean is a member of a large class of animals with segmented bodies.
- Hermit CrabA Hermit Crab is a land- or water-dwelling crustacean.
- LobsterA Lobster is an animal related to the crayfish and shrimp that lives in the sea.
- ShrimpShrimp is an animal found in both freshwater and saltwater throughout the world.
- Predatory Shrimp (Video)Examine the unique abilities of shrimp.
Mollusks
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.
- How Octopuses WorkTo elude predators, the octopus will change color in an instant and even alter its shape to look like other sea animals. Does its magic put the chameleon to shame?
- How Squid WorkSquid have been featured in sailing myths and legends for more than 300 years.
- OysterOysters are an edible mollusk that has a two-pieced shell.
- ScallopA Scallop is an edible mollusk related to the oyster and the clam.
- SquidSquid are fast marine animals that have no backbone.
- Could a squid take down a submarine?Giant squid are aggressive creatures that prey on almost anything that comes their way. How big do these monsters of the sea get, and could they really take down a watercraft?
- ClamClam is the popular name for several types of two-shelled mollusks related to the scallops and oysters.
- ConchConch is a large marine mollusk having a spiral shell.
- MusselMussel is a two-part mollusk. Mussels are found in oceans and in fresh water.
- SlugA Slug is the common name for different types of mollusks that are related to snails.
- SnailSnail, a mollusk that bears a univalve (one-piece) shell. A typical snail shell is cone-shaped and spirally coiled.
Subject Guide
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.
