Colorado Parks and Wildlife found a single zebra mussel veliger in the Grand River Park near New Castle. This is the first new detection of the invasive species since they were found in the Colorado ...

Scientists found a predatory fish with sharp teeth, white eyes in rivers, lagoons and discovered new species: Castellón’s piranha, study said & photo shows.

Scientists found a predatory fish with sharp teeth, white eyes in rivers, lagoons and discovered new species: Castellón’s piranha, study said & photo shows.

Scientists found a predator with “sharp” teeth and white eyes in a river of Bolivia and discovered a new species, a study said. Photo from Getty / iStockphoto In a river of northern Bolivia, a ...

Experts say the fish compete with native species for food, and they're unlike anything else found in the Delaware Valley Watershed.

Fly fishing mecca, the Au Sable River, is No. 1, according to USA TODAY's 10Best Readers' Choice Awards.

Officials in Colorado are sounding the alarm over the presence of an aggressive invasive species that poses a serious threat to local wildlife. According to a press release from Colorado Parks and ...