Pimephales promelas

"The breeding males form small, bony bumps called tubercles on their snouts. These serve no apparent purpose but may be a sign of beauty or prestige in the fish world."

Fathead Minnow — Pimephales promelas. Montana Field Guide. Montana Natural Heritage Program and Montana Fish, Wildlife and Parks. Retrieved on April 30, 2025, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=afcjb32020