A fish previously declared extinct has been released back into the wild in Australia. The olive perchlet, a small oval-shaped fish with large eyes, was considered extinct in Victoria, Australia, in ...

A critically endangered fish in Australia's Mary River seems to have a workable approach to deal with invasive tilapia that's competing for food and habitat. The cod's response to the overcrowding? If ...

Along a nine-mile stretch of river between two waterfalls in the Australian rainforest lives a tiny fish that’s been there for millions of years, hiding between rocks along the riverbank by day and ...