Some fish swim in synchrony. Others, it turns out, breathe in synchrony. This is true for arapaimas, an obligate ...

The hybrid freshwater fish actually reproduces exclusively female clones, doing so for much longer than scientists thought was possible.

All-female species have been long thought of as evolutionary dead ends – but one fish has defied the odds to live without ...

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, ...

Add Yahoo as a preferred source to see more of our stories on Google. Thousands of fish species — about 2,500 of them named — call the Amazon River home, but scientists estimate nearly half of the ...

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 ...

A fish larger than a man, tasty as well as beautiful, the freshwater pirarucu is a favorite with poachers in a lawless part of the Amazon jungle where Brazil, Peru and Colombia meet. Prized for its ...

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 ...