Mekong River Catfish.

1. The Mekong River catfish has a maximum body length of three meters and a weight of 300 kilograms in living waters. The giant snakehead fish measures 89 centimeters in length and 9 kilograms in weight. The Mekong River catfish is larger.

2. The Mekong River catfish is larger and more aggressive than the Mekong River catfish. The giant snakehead fish is less aggressive and smaller than the Mekong River catfish.