Invasive apple snails continue to spread in San Antonio’s River Walk. Officials are testing new barrier systems to curb reproduction.

Thick armor, massive heads, and pure muscle. These invasive plecos shrug off bad shots and keep moving, forcing precise hits and teamwork to bring them in before they disappear back into the shadows ...

One serving of rainbow trout provides 81% of the Daily Value (DV) of vitamin D. Rainbow trout is a popular fish in the salmon family. It is rich in vitamin D, healthy fats, protein, and other vitamins ...

During the River Walk draining from Jan. 11–19, biologists will relocate native fish while removing invasive species to help protect the river’s ecosystem.

For 162 million years, sturgeons have fended off everything they’ve faced. Now scientists are racing to save these living fossils. The white sturgeon is the largest freshwater fish in North America; ...