Some pet tropical fish are naturally placid, while others are fearsome predators.

Below are some reasons why some fish species are aggressive: Fighting for food. Some fish will always compete for food. An aggressive fish will fight off other fish that are perceived to be a threat ...

Piranha is a general name used to describe a group of freshwater fish with a fearsome reputation when it comes to feeding. There are between 40 and 60 different species; none grow larger than two feet ...

Piranhas are some of the most notorious freshwater fish species worldwide. They are well known for their keen and triangular teeth and powerful jaws. Piranhas are originally from the Amazon Basin and ...

A summer swim turned dangerous in northern Argentina after aggressive, sharp-toothed fish swarmed a popular riverside beach, injuring dozens of people and leaving one victim with part of a finger ...