Some already threatened cold-water fish species in the Northwest will not only face shrinking habitat from climate change but will face growing pressure from invasive fish species fleeing their own wa ...

The owner of a koi pond recently encountered the latter when a precocious 8-year-old crept into his backyard and did major ...

Every year, Florida hosts the "Python Challenge." And every year, the 10-day event attracts hunters to the Everglades to help curb the invasive species. But some hunters capture the snakes year-round.

If you've ever heard the urban legend about released pet alligators growing to colossal sizes in sewer systems, you might be surprised to learn that ...

The nation’s top koi aficionados will bring their most spectacular fish — up to 3 feet long — to South San Jose to compete ...

Scientists discovered a new forest killifish in Kenya, revealing both evolutionary and tectonic history—but its habitat is ...