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Food habits and growth of Walleye, Stizostedion v. vitreum, Smallmouth Bass, Micropterus dolomieui, and Northern Pike, Esox lucius, in the Kaministiquia River, Ontario

1991; Ottawa Field-Naturalists' Club; Volume: 105; Issue: 4 Linguagem: Inglês

10.5962/p.358102

0008-3550

S. A. Stephenson, Walter T. Momot,

Fish Ecology and Management Studies

Food habits and growth rates were determined for Walleye (Stizostedion vitreum), Smallmouth Bass (Micropterus dolomieui) and Northern Pike (Esox /ucius) from the Kaministiquia River near the City of Thunder Bay, northwestern Ontario in the summer of 1987.Adult Walleye were mainly piscivorous (90% by frequency) consuming large numbers of Johnny Darters (Etheostoma nigrum).Fishes most commonly eaten were those known to have a close association with the bottom.YOY Walleye were entirely piscivorous.Adult Smallmouth Bass consumed fish with high frequency (61%).However, total volume and weight of food consumed was dominated by crayfish.YOY Smallmouth Bass mainly ate insects.Adult Northern Pike were largely piscivorous (85% by frequency) consuming large numbers of White Suckers (Catostomus commersoni) reflecting close habitat association in shallow, weeded areas.Food habits of YOY Northern Pike mirrored those of adults.Growth rates of Walleye and Northern Pike equalled or exceeded Ontario provincial averages for the first five years of growth before dropping below these averages.Smallmouth Bass grew faster than some southern Ontario lacustrine populations.Age four Walleye had the highest condition factors of all age classes examined.Age four Smallmouth Bass had one of the lowest.