Stalking the Suckermouth: An environmental group turns to spearfishing as it wages war on an invasive catfish species in the San Marcos River.

The article focuses on a snorkeling expedition in the San Marcos River to participate in Atlas Environmental's polespear tournament, aimed at removing invasive fish species. Topics include the chilly early morning conditions and preparation for the event, the role of Nick Menchaca and his business in combating invasive species, and the mechanics of using a polespear to hunt armored catfish and other non-native fish.