freshwater
Fallfish
Semotilus corporalis
Elongated, robust body with large, prominent scales that often show a cross-hatched pattern. The back is olive-green to dark brown, fading to silvery-white sides and belly. Fins are typically plain or slightly yellowish, lacking distinct bright spots or harsh bands.
- Habitat
- Inhabits clear, cool streams, rivers, and margins of lak…
- Size & weight
- Typically ranges from 20 to 30 cm in length and weighs a…
- Diet
- Opportunistic omnivore feeding on aquatic and terrestria…
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Physical characteristics
Elongated, robust body with large, prominent scales that often show a cross-hatched pattern. The back is olive-green to dark brown, fading to silvery-white sides and belly. Fins are typically plain or slightly yellowish, lacking distinct bright spots or harsh bands.
Habitat & distribution
Inhabits clear, cool streams, rivers, and margins of lakes, preferring rocky or gravel substrates with moderate current.
Behavior
Generally active during the day, forming small schools when young while larger adults tend to be more solitary or form loose aggregations.
Diet
Opportunistic omnivore feeding on aquatic and terrestrial insects, crustaceans, small fish, and occasionally algae and plant matter.
Reproduction
Spawns in the spring over gravel riffles where males construct large nests by carrying stones in their mouths. Females deposit eggs in the nests, which are then guarded and maintained by the males.
Ecological role
Acts as both predator and prey within its ecosystem, feeding on smaller aquatic organisms while serving as an important food source for larger piscivorous fish and birds. Their large nests also provide spawning habitat for other stream-dwelling minnow species.
Similar species
Creek Chub (Semotilus atromaculatus), which features a distinct dark spot at the base of the dorsal fin and a dark lateral stripe, distinguishing it from the larger and more uniform Fallfish.
Identification tips
Look for the very large, prominent cycloid scales, the absence of barbels near the mouth, and the lack of a black spot at the dorsal fin base.
Interesting facts
Fallfish are the largest native minnows in the northeastern United States and southeastern Canada. Their stone-pile nests are frequently utilized by several other species of fish for spawning.