Across the street from Sewell Park, while most people tried to get a suntan or go tubing on a cloudy day, a group of researchers worked to capture suckermouth armored catfish, an invasive species in the San Marcos River.

The fish are seemingly invisible in the murky water, but the researchers from Texas A&M University and the Meadows Center for Water and Environment spotted a few and were quick to begin their work.

Read more from Marina Garcia here.