The resolution designates the Iowa darter (etheostoma exile) as the official state fish of Iowa. This fish is unique as it is the only species named after the state and was first documented in Iowa in 1889. Known for its vibrant colors, the Iowa darter grows to about two and a half inches long and is characterized by its bright green body with dark brown blotches and red spots. It thrives in clean, vegetated waters, making it an important indicator of water quality in the state. The Iowa darter symbolizes the native fish diversity and the environmental challenges faced in Iowa.

In addition to the designation, the resolution mandates that the director of the department of administrative services obtain and display appropriate representations of the Iowa darter in the state historical museum. Furthermore, the Iowa official register will include a picture and commentary about the Iowa darter alongside other state symbols such as the state rock, flower, bird, and tree. This initiative aims to promote awareness and appreciation of Iowa's natural heritage.