The fathead minnow, also known as the round head, is a small freshwater fish that is very common in the rivers and lakes of Quebec. Although it is not sought after for sport fishing due to its small size and low fighting ability, it plays a crucial role in the aquatic ecosystem as prey for many predatory fish. It is also often used as live bait by anglers. Widely distributed in southern Quebec, the fathead minnow prefers calm, shallow waters where it can reproduce abundantly.

The fathead minnow has a relatively robust and stocky body, characteristic of its name. Its color ranges from gray-green to silver-brown, with metallic reflections that can be more pronounced depending on the light. The sides are often sprinkled with small dark spots. The mouth is small and terminal, well adapted for feeding on small organisms. The fins are generally clear, with the dorsal fin located towards the middle of the back. The caudal fin is slightly forked. The scales are relatively large and easily visible. During the spawning period, the male develops nuptial tubercles on the head and body, and its coloration can become darker, almost black. Females are duller and do not display these nuptial characteristics.

The fathead minnow is widely distributed in southern Quebec, particularly in the watersheds of the Saint Lawrence River and the Outaouais. It is also found in the lakes and rivers of the Laurentians, Montérégie, and Estrie regions. Although abundant in these areas, it is less present in northern regions where aquatic conditions are less favorable. This fish prefers calm, shallow waters, which explains its limited presence in fast-flowing rivers.

The fathead minnow favors calm, shallow waters, often rich in submerged vegetation. It is frequently found in ponds, marshes, as well as in the quiet areas of rivers and lakes. It prefers sandy or muddy bottoms where it can easily hide from predators. Moderate water temperatures, between 18 and 24 °C, are ideal for this species. Look for it near shorelines, where the vegetation provides shelter and an abundant food source.

The spawning of the fathead minnow occurs in spring, when the water temperature reaches around 18 °C. Males build nests by cleaning a substrate surface, often under a rock or a piece of submerged wood. Females lay their eggs there, which the male protects and aerates by fanning them with his fins. The eggs usually hatch within a week. Young minnows grow quickly and reach sexual maturity in one year. Their relatively short life cycle allows them to reproduce in large numbers, ensuring a constant presence in their habitat.

Spring → Spawning → Hatching → Rapid growth → Winter (metabolic slowdown)

The fathead minnow is a social fish, living in schools to protect itself from predators. It is not territorial and tolerates the presence of other species well. Not sensitive to fishing pressure, it continues its normal activities even in areas frequented by anglers. It reacts little to changes in weather, but prefers calm waters and avoids strong currents. Daylight does not bother it, but it is more active on cloudy days.

The diet of the fathead minnow consists mainly of zooplankton, aquatic insects, and small invertebrates. Young minnows primarily feed on microorganisms and suspended organic matter. As they grow, they diversify their diet to include insect larvae and algae. In winter, their feeding activity decreases, but they continue to eat whatever they can find under the ice.

In spring, the fathead minnow is very active, preparing for spawning. Longer days and rising water temperatures encourage their activity. In summer, they gather in shaded areas of rivers and lakes to avoid excessive heat. In autumn, their activity gradually decreases with falling temperatures. In winter, they slow their metabolism but remain active under the ice, often hiding in deeper areas where the water is more stable. Their activity is highest early in the morning and late in the day, especially on overcast days.

Although the fathead minnow is not targeted by lures, anglers wishing to catch predatory fish in the same waters often choose lures that mimic the natural colors of minnows: silver, olive green, or brown. These colors are effective in both clear and murky waters. To maximize chances, opt for lures with metallic reflections under sunny skies, and more matte colors on overcast days.

To catch fathead minnows, a light rod of 5 to 6 feet is ideal, with a fast action to feel the small bites. A light reel with a 2 to 4 lb line is sufficient. Use small hooks (size 10 to 16) to match the small mouth of the minnow. A fluorocarbon leader can be helpful in clear waters to make the bait less visible.

Handle minnows carefully to avoid injuring them. Use wet hands to hold them, as their scales are delicate. If you release them back into the water, do so quickly to minimize stress. For photos, hold them close to the water to release immediately afterward.

Fathead minnows are a favored prey for many predatory fish in Quebec, such as pike, walleye, and bass. Aquatic birds, such as herons and kingfishers, also make them their meal.

The fathead minnow is not a threatened species in Quebec. It is abundant and plays a key role in the aquatic ecosystem. No strict regulations apply to its capture, but it is important to follow good fishing practices to maintain its population.