Scientists discovered new fish species. These include a blob-headed catfish, a tiny pipehorse, and three pacu species.

Florida's waters just got a whole lot scarier! PIRANHAS are growing in numbers, and we just caught HUNDREDS of baby piranhas in a Pacu fish trap! Are these razor-toothed predators taking over? Watch ...

This is the moment a sick fish underwent radiographs at a zoo in Milwaukee. Footage shows veterinarians conducting medical tests on a Pacu fish at the Milwaukee County Zoo, on February 18. The marine ...