Freezing Temperatures Responsible for Dead Fish Along the San Antonio River

Written by:

Posted on:




Get The Latest:

Join our print or digital newsletter to be informed about the agency’s many projects and other news.

WHAT: Due to the persistent below freezing temperatures over the past few days, the public may see the presence of dead fish along the San Antonio River Walk. The San Antonio River Authority (River Authority) Environmental Sciences Department is closely monitoring these sightings as part of their daily responsibilities. This is not a sign of poor water quality. Non-native tropical fish like blue tilapia and Plecostomus (suckermouth catfish) often cannot survive when water temperatures drop below 50 degrees (Fahrenheit). The freezing temperatures may also affect native species. The River Authority’s Watershed & Park Operations department will be working on removing any dead fish once conditions are deemed safe to do so.

The public is encouraged to report these sightings to the River Authority’s Environmental Investigations team online or by calling 866-345-7272. Visit the Public Services section at to learn more about our Environmental Investigations team and check out our Education section to learn more about the San Antonio River Basin.

Related Articles


San Pedro Creek: Rains from the Heavens

The Rains from the Heavens water wall at San Pedro Creek will be shut off due to maintenance Tuesday, June 18th. There will also be some road closures that day, so please be mindful if you are in this area. We apologize for the inconvenience.

Acequia Trail Notice

The Acequia trail will have heavy traffic near MROC starting May 22nd until further notice. The SAWS Acequia project will be bringing in crews to work on the lift station site and across the street. There will have flaggers to stop traffic, please use caution. 

SASPAMCO Paddling Trail

The SASPAMCO paddling trail is open from River Crossing Park to Helton Nature Park.
*Please Note: Paddling Trail from Helton Nature Park to HWY 97 is still closed due to blockages. 

River Reach Newsletter and Blog Signup

River Reach is offered as a printed, physical mailing to your residence or business. The Blog is a weekly electronic email with news and updates in order to be more environmentally conscious. Please fill out the form below and indicate your preferred method of delivery.

By submitting this form, you are consenting to receive marketing materials from: San Antonio River Authority, 100 East Guenther St., San Antonio, TX, 78204, US. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.