Pimephales notatus
Spot the bluntnose minnow in the Great Lakes & Ontario region. Cool-water freshwater diver's guide to ID, behaviour, and when to look.
A small, slender silvery fish with a distinctly blunt, rounded snout that overhangs the mouth, the feature that gives it its name. Look for a dark lateral stripe running from snout to tail and a dusky spot at the base of the dorsal fin. Breeding males develop small tubercles (hard, pearly bumps) on the snout, making them easier to distinguish in spring.
Bluntnose minnows tend to form loose schools near the bottom in shallow, clear freshwater, over gravel or sandy substrates around aquatic vegetation. They are not particularly wary of slow-moving divers and will often hold position briefly before drifting away. Expect to spot them foraging along the substrate, picking at algae and organic debris.
Males are notably paternal: a breeding male will guard a nest site under a flat rock or submerged object and tend the eggs, fanning them and defending the territory against rivals, behaviour worth watching for during spring dives.
There is not enough seasonal data to point to a peak month, so treat it as a year-round possibility. Its observed temperature range of 1.4 to 21.3 °C means it is active even in cold Ontario winters, though summer visits to shallow rocky or weedy areas may offer the best visibility conditions.
All recorded sightings come from Canada, concentrated in the Great Lakes and Ontario region. If you're freshwater diving in Ontario, this is the region where you stand the best chance of an encounter, though sightings remain uncommon across all known sites.
Mapping where Bluntnose Minnow is logged…
All diver-logged sightings are from Canada, specifically the Great Lakes and Ontario region. Freshwater divers exploring shallow, rocky or weedy sites in Ontario have the best shot at encountering this species.
There is no clear seasonal peak in the data, so encounters are possible year-round. The species tolerates very cold water, but summer dives in shallow Ontario waters tend to offer the clearest conditions for spotting small fish near the bottom.
Key in on the blunt, rounded snout that visibly overhangs the mouth, it's the most reliable field mark. A dark lateral stripe and a spot at the base of the dorsal fin complete the picture. Breeding males also sport small pearly bumps on the snout.
Bluntnose minnows are small fish, typically reaching around 5 to 9 cm in length. Underwater they appear as slim, silvery fish that would easily fit in the palm of your hand.
Not at all. Bluntnose minnows pose no threat to divers whatsoever. They are small, timid fish that will simply move away if approached too closely.
Males are attentive nest-guarders. A breeding male claims a flat rock or submerged object, entices females to deposit eggs on its underside, then defends and aerates the clutch until hatching, a rare level of parental care among small freshwater fish.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
Sun Perch
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