There are plenty of species that we know exist, but the finer points of their day-to-day lives, breeding behavior, and ecology have not been extensively studied. In the Paraguay River basin in Brazil, ...

In a river near a police department in southern Brazil, thousands of catfish amassed at the base of a waterfall and began to climb. The unusual fish gathering caught the attention of police officers — ...

In November 2024, members of Brazil’s environmental military police and scientists observed a “massive aggregation” of small catfish making their way up waterfalls in Brazil. These first-of-their-kind ...