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

Brown Trout Salmo trutta

Salmonidae (Trouts)
Trophic Class
Top Carnivore
Is Exotic to Iowa?
Is Lithophilous Spawner?
Is Hybrid?
State Listing Status
Not Listed
Assessment Program Statistics

This species was found at 66 bioassessment sites, 5 rapid fish bioassessment sites, 81 fisheries assessment sites, and 3 fisheries presence-only assessment sites. In total, it was collected at 139 distinct sites, or 11.2% of the 1237 total sites monitored by the bioassessment program. It is the 38th most commonly collected species.

The Brown Trout was collected in 143 bioassessment sampling sessions and 211 fisheries assessment sessions. It was present in 5 rapid bioassessment sessions and 3 presence-only sessions.

The biological assessment program has collected a total of 34,060 individual Brown Trout specimens, ranking it the #12 most collected fish.

Species Distribution Map