Biologists are on high alert as the ongoing drought dries up the rivers some animals call home.

Floating the river has been a favorite pastime for people looking to celebrate the end of summer on Labor Day weekend but the Comal, Guadalupe and San Marcos rivers aren’t flowing quite so fast this year.

A man’s body was pulled from the San Marcos River in Martindale on Sunday, according to the Caldwell County Sheriff’s Office.

Paddle SMTX is a family-owned company that offers paddle tours of the San Marcos River — but it’s the glow tours that are drawing attention on social media.

Paddle SMTX is a family-owned company that offers paddle tours of the San Marcos River — but it’s the glow tours that are drawing attention on social media.

Texas Parks and Wildlife officials posted a video to Facebook on Thursday showing divers removing suckermouth armored catfish from the river.

A total of 406 invasive suckermouth armored catfish were removed from the San Marcos River in recent weeks.

Treasure diver Brandon Jordan featured the popular New Braunfels tube chute to feature on his popular “Jiggin’ With Jordan” YouTube channel.

HAYS COUNTY, Texas – The body of a missing tuber was found by authorities in the San Marcos River on Sunday afternoon, according to a report from the Hays Free Press. The man, identified as Jesse Austin Jr., 29, disappeared Saturday afternoon while on a float trip. According to the Hays Free Press' report, Austin had fallen out of his tube near Martindale and had not resurfaced. The sheriff’s office told the Hays Free Press that “multiple agencies” participated in the search for Austin in the area where he was last seen. Related: Update: Woman, 85, who disappeared in San Antonio found in El Campo

SAN MARCOS, Texas As the temperatures heat up, people looking to cool off will flock to local rivers and springs. In Hays County at the San Marcos River, visitors may encounter conservationists working around them, trying to preserve the streams flow and healthy habitat. In 2013, the Edwards Aquifer Authority implemented a habitat conservation plan (EAHCP) to create and maintain the habitat for federally protected species that live in the San Marcos River and the Comal Springs System. A portion of the water withdrawal fees paid by utility companies, such as the San Antonio Water System (SAWS), helps support ongoing conservation efforts. Texas wild rice is native only to Hays County, through the conservation efforts experts say theyve seen it thrive.