The bull shark, capable of reaching lengths equivalent to a small car, and the rarely- seen speartooth are two shark species that can survive in freshwater. Biologist Zeb Hogan travels to Australia to track down these dangerous river sharks.

Fish biologist Zeb Hogan is searching for one of the freakiest fish in the world. Vampire fish, known locally as payara, weigh up to 40 pounds, hunt like great white sharks and have terrifying 6-inch fangs. Zeb is heading into the heart of Guyana, South America, to catch a river vampire and find out more about some of the biggest fangs on Earth.

Join Zeb Hogan as he explores the maze-like river systems of Argentina on a quest to catch a colossal 400-pound short-tailed river ray, the largest freshwater stingray found in South America, and uncover the surprising sting hiding in its tail!

Join Zeb Hogan as he heads to southern France to try to catch a mammoth-sized 650 lb. Wels catfish and witness one of the most bizarre feeding behaviors he's ever heard of.

Fish biologist Zeb Hogan has caught some of the biggest fish species in the world, but he’s never caught this protected, ocean-dwelling giant! Join Zeb as he explores Florida’s deep-water reefs and wrecks on a quest to catch a gargantuan 7-foot goliath grouper, the largest of the western Atlantic groupers, and uncover the surprising truth about its monstrous reputation.

Zeb Hogan searches for super-sized catfish in the last great, undammed river of Asia, the Salween.

Shark scientist Dr. Tristan Guttridge researches the annual migration of great hammerheads.

Zeb Hogan travels to Mexico to uncover the truth behind a mysterious swarm of sharks.

Zeb Hogan searches for the fish with the worst reputations, to find out if they live up to the bad hype.

Zeb Hogan encounters some of the most gluttonous fish on the planet.