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Zeb Hogan

Tach Phanara and a colleague from the Cambodian Fisheries Administration collect a DNA sample from a striped river catfish prior to releasing it into the Tonle Sap.

Striped river catfish are introduced into a fish reserve in the Tonle Sap Lake, Cambodia.

Zeb Hogan and a Cambodian colleague release a Mekong giant catfish in the Tonle Sap River, Cambodia in November 2007. The more recent release of critically endangered Mekong giant catfish into the Tonle Sap Lake is part of a program to reinstate giant fishes in the wild.

The wallago goes by many names. Also known as the giant sheetfish or helicopter catfish, it lives in the Mekong River basin, where it’s been fished for food since ancient times.

Found in the Mississippi River basin, the American paddlefish, also known as the spoonfish, has long been exploited by humans for both its meat and for its eggs, which are used to make caviar.

Southeast Asia’s Mekong River is home to many of the world’s largest freshwater fish, including the critically endangered giant Siamese carp, which can grow to over 600 pounds.

The alligator gar, which can grow up to 10 feet long, is one of North America’s largest freshwater fish.