The wels catfish is one of the largest freshwater fish. It can weigh over 150kg, that's the same as two adult people.
Wels catfish, Silurus glanis
The wels catfish (Silurus glanis) is an enormous freshwater fish that lives in warm lakes and sluggish rivers. It has slippery greenish-brownish skin with a pale-coloured belly.
What makes this fish remarkable is its size. It's one of the largest freshwater fish, growing up to 3m long and can weigh up to 150kg, that's the same as two adult people.
Most of them are a little more dainty, but they're still whoppers. Being a metre and a half long is quite normal for a wels catfish, and if you caught one in a UK lake, it would probably weigh about 27kg. That's about the size of a child.
These fish have enormous mouths to go with their weighty bodies. They gulp down worms and other creepy-crawlies that live in or near the water, as well as eating smaller fish. The larger ones also swallow frogs, water rats and water birds like ducks.
There are other big fish in the ponds and lakes of the world. Here are some of the biggest: