Here's why:
* Great white sharks are among the largest predatory fish in the world, reaching lengths of up to 20 feet and weighing up to 5,000 pounds.
* Catfish come in a wide variety of sizes, but even the largest species, like the Mekong Giant Catfish, are typically much smaller than great white sharks, reaching lengths of up to 10 feet.
So, while some catfish can be quite large, a great white shark is easily the bigger of the two.