The Guadalupe bass (Micropterus treculii) is a freshwater fish endemic to the clear, fast-flowing rivers of central Texas. It is recognized for its olive-green body with distinctive dark horizontal stripes and a streamlined shape. Known for its aggressive feeding behavior, it primarily consumes insects and small fish. This species plays a vital role in its ecosystem by maintaining the balance of aquatic life.

Micropterus treculii, commonly known as the Guadalupe bass, is native to the central part of Texas, United States. Its natural distribution is primarily within the Edwards Plateau region and the Guadalupe River system.

The species is typically found in clear, cool streams and rivers with rocky substrates. It prefers environments with moderate to strong current, abundant cover such as undercut banks and overhanging vegetation, and a mixture of riffles and pools.

Micropterus treculii occupies a niche as a predatory fish within its native aquatic ecosystems. It feeds on a variety of prey including insects, crustaceans, and small fish, playing a role in controlling the populations of these organisms and maintaining ecological balance.