Visitors to the Tennessee Aquarium in Chattanooga trace the journey of water from the mountains through the Appalachian Cove Forest, into the Ohio River where it joins with the Mississippi that flows into the Gulf of Mexico.

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The Tennessee Aquarium has two buildings called River Journey and Ocean Journey. 

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The Appalachian Cove Forest exhibit begins with River Otter Falls, an artificial waterfall that cascades into a 30,000-US-gallon mountain sink.

The Delta Country exhibit showcases the Mississippi River Delta and includes an Alligator Bayou, where American alligators and alligator snapping turtles lurk under swampy waters.

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Over the years, zoos have developed many ways to display animals. The least desirable is the barren cage. Animals kept in such conditions suffer from inactivity and boredom.

One freshwater exhibit at the Tennessee Aquarium recreates the variety of habitats found at Nickajack Lake.  Flathead catfish perch on rocks. Sunfish hang motionless beneath sunken trees. Bass position themselves in the flowing current.

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The electric eels caretaker says, “You can see the tree faintly flickering when Miguel’s just checking out his environment.  But he gives off really bright flashes when he’s eating, since electric eels use their charge to stun prey.” 

“Electric eels can produce enough electricity to power 10 lightbulbs,” says C. David de Santana, a fish researcher with the Smithsonian Institution’s National Museum of Natural History.

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The largest tank, the Secret Reef, replicates the environment of the Flower Garden Banks National Marine Sanctuary in the Gulf of Mexico and is home to sand tiger sharks, bonnethead sharks and green sea turtles.

At Penguins' Rock, macaroni penguins and gentoo penguins frolic onshore and swim their 16,000-gallon tank. 

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