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Discus are often called the "king of aquarium fish" because of their striking colors and round shape.

The Napolean wrasse is one of the largest reef fish and can live for more than 30 years. 

Ocean sunfish are the heaviest bony fish in the world, with some weighing over a ton.

Giant trevallies are powerful predators that have been seen leaping from the water to catch birds. 

Peacock bass are colorful freshwater fish native to the Amazon River basin.

Oarfish are the longest bony fish in the world, with some growing over 30 feet long.

The coelacanth was once thought to be extinct until a living specimen was discovered in 1938.

Alligator gar have broad snouts filled with sharp teeth that resemble those of an alligator. 

Giant groupers can weigh over 800 pounds, making them one of the largest reef fish on Earth. 

The Devil's Hole pupfish lives in just a single tiny desert pool in Neveda.

Red handfish use their hand-like fins to "walk" across the seafloor instead of swimming.

The Chinese paddlefish was one of the largest freshwater fish before it was declared extinct. 

Sakhalin sturgeon are critically endangered and are among the rarest sturgeon species in the world. 

Longnose chimaeras are deep-sea relatives of sharks and rays with long, pointed snouts. 

A durable igneous rock formed from slowly cooled magma beneath the Earth's surface.

A sedimentray rock made from primarily from the remains of ancient marine organisms. 

A gritty sedimentary rock formed from layers of compressed sand.

A fine-grained metamorphic rock that naturally splits into thin, flat sheets.

A dark volcanic rock created when lava cools quickly at the Earth's surface.

A beautiful metamorphic rock prized for its smooth texture and elegant patterns.