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

Stonecat Noturus flavus

Ictaluridae (Catfishes)
Trophic Class
Benthic Invertivore
Is Exotic to Iowa?
Is Lithophilous Spawner?
Is Hybrid?
State Listing Status
Not Listed
Assessment Program Statistics

This species was found at 366 bioassessment sites, 10 rapid fish bioassessment sites, 64 fisheries assessment sites, and 3 fisheries presence-only assessment sites. In total, it was collected at 431 distinct sites, or 29.9% of the 1442 total sites monitored by the bioassessment program. It is the 16th most commonly collected species.

The Stonecat was collected in 785 bioassessment sampling sessions and 133 fisheries assessment sessions. It was present in 10 rapid bioassessment sessions and 3 presence-only sessions.

The biological assessment program has collected a total of 6,324 individual Stonecat specimens, ranking it the #39 most collected fish.

Species Characteristics

Body color is yellowish-green to olive above and light below. The premaxillary band of teeth, a pad-like band on the upper jaw, is U-shaped, and the chin barbels are yellow. There are usually 16 rays in the anal fin. This fish has been known to reach 12-inches long, but it rarely exceeds 6- to 8-inches. Most anglers can distinguish this species from the other catfishes, but some confuse them with the young of other species.

Species Distribution Maps

HUC12 watersheds where this species has been found