Creek Chub

Semotilus atromaculatus is one of the most commonly encountered minnows in small to medium-sized streams across eastern North America, tolerating a wide range of water quality conditions from pristine headwaters to somewhat degraded habitats. It is readily identified by the dark lateral stripe terminating in a spot at the caudal base and the small dark spot at the base of the dorsal fin. Breeding males develop a vivid pink-red flush on the lower flanks and extensive head tubercles used to carry pebbles for nest construction — a fascinating behaviour to observe.

In the aquarium, Creek Chubs are bold and active fish that quickly become familiar with their keeper. They appreciate a naturalistic stream setup with gravel substrate and moderate current. They are omnivorous and among the most food-flexible of the native minnows, accepting virtually all standard aquarium foods.

Their moderate adult size, engaging personality, and interesting breeding behaviour make them excellent native fish for intermediate aquarists. They are semi-aggressive and may chase smaller tankmates, so appropriate companion selection is important.

Water: 10–24 °C, pH 6.5–8.0, moderate hardness; tolerates variable conditions better than most native minnows. Tank: 200 L minimum; gravel substrate with pebbles; open areas and some cover. Feeding: Live/frozen invertebrates, small fish, insects; readily accepts pellets and flake foods. Breeding: Male constructs pebble pit nest and guards it; fascinating and achievable in captivity. Compatibility: Semi-aggressive; may chase very small fish — keep with comparably sized species.