By Gustavo Faleiros The background was right for the announcement of the bad news. Fish swam in a wall-sized tank that framed ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Two new colorful ...

It may sound too bizarre to be true, but the Amazon molly (Poecilia formosa), a fish that inhabits rivers, lakes, and swamps ...

Piranhas are among the most deadly creatures in the water, with razor-sharp teeth capable of slicing flesh easily, but a fish in the Amazon River basin has developed a "bulletproof vest" to protect ...

The fires burning through the Brazilian Amazon are a threat to the fish that rely on forest flooding to survive, raising fears the fish will be lost. The Amazon rainforest in Brazil is still burning, ...

Amazon basin fish species living in lakes, floodplain forests and river systems need a high degree of connectivity to stay genetically diverse and healthy, but this connectivity is threatened by ...