Guadalupe bass
A rare Texas endemic black bass prized by anglers for its fighting spirit.
The Guadalupe bass is a unique freshwater fish found only in central Texas. It serves as the official state fish and faces threats from hybridization with introduced species.
- Official state fish of Texas.
- Endemic to central Texas rivers.
- Threatened by hybridization with smallmouth bass.
- Known as the Texas brook trout by anglers.
- Male guards nest without eating during incubation.
What it is
This rare black bass displays lime to olive green colouration that fades with age. Its lateral line features diamond-shaped spots that shift from black to olive over time. The body shape resembles the spotted bass but carries green hues lower down. A rectangular tooth patch sits on the tongue. Adults typically reach modest sizes, with the largest recorded catch weighing just under four pounds.
Where it lives
These fish inhabit the Edwards Plateau in central Texas. They dwell in the San Marcos, Colorado, Llano, and Guadalupe Rivers. Smaller populations exist in Barton Creek, Onion Creek, and the Comal River. They avoid extreme headwaters but thrive in flowing streams near large rocks or submerged timber.
How it lives
Juveniles prefer fast-moving water before shifting to deeper areas with moderate currents. Adults hunt insects and small fish like shad and bluegills. They lack natural predators but face significant pressure from hybridization with introduced smallmouth bass. This mixing threatens pure genetic lines in several river systems.
Breeding and life cycle
Maturity arrives at one year of age. Spawning occurs between March and June, sometimes extending into late summer. Males construct gravel nests in shallow, high-flow areas to attract females. After egg deposition, the male guards the clutch fiercely without eating until the fry hatch and begin feeding on invertebrates.
Fish and people
Anglers prize this species for its tough fights and bright colours. It earns the nickname Texas brook trout due to its insect diet and current manipulation. Fly fishermen particularly enjoy targeting them. Conservation efforts promote catch-and-release practices to support dwindling wild populations against hybrid threats.
Status and threats
The species holds Near Threatened status due to genetic dilution. Hybridization with smallmouth bass poses the primary risk, creating mixed populations in some rivers. State agencies plan stocking programmes to bolster pure Guadalupe bass numbers. These initiatives aim to restore genetic integrity across key habitats.
Questions people ask about Guadalupe bass
Where can I find Guadalupe bass?
They live exclusively in central Texas. Look for them in the San Marcos, Colorado, Llano, and Guadalupe Rivers. They also inhabit smaller streams like Barton Creek and Onion Creek within the Edwards Plateau region.
How do they differ from spotted bass?
While similar in shape, Guadalupe bass carry green colouring lower on their bodies past the lateral line. Their spots on the lateral line are distinct diamonds that fade with age. Genetic testing helps distinguish them from hybrids.
Why is it called the Texas brook trout?
Anglers use this name because the fish fights like a trout. It manipulates river currents and eats insects. This behaviour mirrors rainbow trout, making it popular among fly fishermen who enjoy its vigorous struggles.
What is the main threat to their survival?
Hybridization with introduced smallmouth bass is the biggest danger. Mixed offspring dilute the pure gene pool. Some rivers contain nearly half hybrid individuals. Stocking pure specimens aims to counter this genetic erosion.
Good reading and sources
- Guadalupe bass on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Guadalupe bass", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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