Round Whitefish
Prosopium
cylindraceum
Status
Range widely throughout North America and into northeastern Asia. In
our province it occurs only in Labrador. These fish can grow to a maximum size
of 22 inches and 4.5 pounds.
Habitat
Shallow areas
(usually less than 150 ft.(46m)) of lakes and clear streams. Rarely found in
brackish (salty) waters.
Food
This
bottom feeder eats a variety of benthic (bottom) invertebrates
including mayfly larvae, caddisfly larvae, small mollusks such as fingernail
clams and snails, and the eggs of other fish species such as Lake Trout.
Appearance
Brown to bronze
above, dark-edged scales, silver-white sides, amber lower fins, dusky dorsal
(back) fin and tail fins; fairly pointed snout.
Breeding
Biology
Spawning occurs in
the fall on gravelly shoals in lakes or at the mouths of rivers at temperatures
of 4.60C. Males usually arrive on the spawning grounds before the
females. Neither males nor females eat before or during spawning activities.
During spawning fish swim in pairs, but like other whitefish, no care is given
to the eggs or the young. Females can carry between 2,000 to 11,000 eggs
depending on body size. Eggs take roughly 140 days to hatch.
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