Iowa DNR
River & Stream Biological Monitoring
Fish and Benthic Macroinvertebrate Surveys
Physical Habitat Assessments

Central Stoneroller Campostoma anomalum

Cyprinidae (Minnows)
Trophic Class
Is Exotic to Iowa?
Is Lithophilous Spawner?
Is Hybrid?
State Listing Status
Not Listed
Assessment Program Statistics

This species was found at 575 bioassessment sites, 104 rapid fish bioassessment sites, 97 fisheries assessment sites, and 32 fisheries presence-only assessment sites. In total, it was collected at 726 distinct sites, or 53.8% of the 1349 total sites monitored by the bioassessment program. It is the 7th most commonly collected species.

The Central Stoneroller was collected in 1176 bioassessment sampling sessions and 283 fisheries assessment sessions. It was present in 104 rapid bioassessment sessions and 40 presence-only sessions.

The biological assessment program has collected a total of 126,123 individual Central Stoneroller specimens, ranking it the #1 most collected fish.

Species Characteristics

Body form varies from slender to moderately stout. They are slightly compressed laterally with an arch in the back. The horizontal mouth is sub-terminal and lacks a barbel. A cartilaginous and chisel-shaped lower jaw is a distinct characteristic of stonerollers. Slender arches support the slightly hooked pharyngeal teeth, which are arranged in a 4-4 pattern. The lateral line is complete, with 49 to 55 scales, and the circumferential scale counts (around the body frontal of the dorsal fin) range from 39 to 55. Dorsal and pelvic fins ray count are 8, while the pectoral fins have 15 rays and the anal fins 7 rays. The long intestine is usually wrapped around the air bladder, and it is covered by a black peritoneum. The body is brownish-olive with a brassy luster above and silvery to white beneath. Body sides are marked with scattered dark scales, giving the fish a mottled look. Spawning males develop a dark bar across the anal fin and have tubercles on their back, top of the head, and between the nostrils.

Species Distribution Maps

HUC12 watersheds where this species has been found