Jeremy Wade is investigating a mermaid-like "Water Mama killer". And, if we've learned anything about the Amazon, monster investigations always lead to piranhas somewhere along the way.

It took island ingenuity and some line to reel in the elusive and dangerous needlefish.

Jeremy Wade catches a catfish in the Congo so powerful that it could possibly drag someone to their death. Just imagine what an adult-sized version of this fish can do.

Jeremy Wade is on the hunt for the "Water Mama" of local Amazon legend. Could this night time predator be the killer?

Eels are unlike any other fish when you're trying to catch them - because of their tails. Hear from Jeremy on the best gear and techniques to reel these monsters in.

It's feeding time at the barbel run and Jeremy Wade is right in the middle of the action. He catches African tigerfish after tigerfish and proves once and for all that they do hunt in packs like piranhas!

The lungfish is an ancient creature, predating all animals that walk on land. This bizarre river monster probably senses its meals by vibration or scent. It also apparently enjoys belching.

With a storm brewing Jeremy has a small window to bring in a huge fish and it turns out to be a Semutundu catfish! While it isn't the river monster he is after, it is quite an impressive catch!

Jeremy looks back on how he managed to find one of the ocean's most intelligent and opportunistic creatures.

Jeremy is in Africa to catch a fish that is responsible for devouring a bus full of passengers in the water. He catches a sharp-toothed catfish, could this be the culprit?

Jeremy Wade discovers an Alaskan monster: the white sturgeon, an ancient fish that can grow up to 20 feet long. At merely 9 feet, Jeremy's catch is one of the largest freshwater fish he's ever hooked.

Jeremy puts his fears aside to get a close look at animal with the potential to kill 50 people in under two minutes.

Top Fan Favorites: When Jeremy Wade went to Chernobyl, he was given unprecedented access to fish in contaminated waters. This is one of the most popular clips on AnimalPlanet.com - see what Jeremy has to say about the experience.

What lured a man to his murky, underwater demise? Jeremy Wade's investigation leads to the monstrous Arapaima, a massive and powerful beast of the Amazon.

Of all the fish Jeremy has reeled in, the lau lau stands out as his most meaningful catch.

Jeremy Wade travels back in time to hunt the most monstrous river monsters you've never heard of! Meet one beast you should be glad you'll never encounter.