Spawning by Hatchery-Origin Lake Trout (Salvelinus namaycush) in Lake Ontario: Data from Egg Collections, Substrate Analysis, and Diver Observations

June 26, 1991 - J. Ellen Marsden; Charles C. Krueger

Journal or Book Title: Canadian Journal of Fisheries and Aquatic Sciences

Volume/Issue: 48

Page Number(s): 2377-2384

Year Published: 1991

Three techniques were used to find evidence of reproductive activity by stocked lake trout (Salvelinus namaycush) on Stony Island reef in Lake Ontario from 1986 to 1990. In the fall, egg nets and traps were deployed on different substrate types, and in the spring, fry traps were used to capture newly emergent fry. Fry were only captured in an area approximately 50 by 10m at the north end of the eastern edge of the reef. Eggs were only captured in nets and traps deployed near this area, or in nets and traps which moved over this area during storms and came to rest at the base of the reef. The area of Stony Island reef actually used by lake trout for egg deposition appeared to be extremely limited relative to the entire reef. This area was characterized by large cobble substrate with minimal infilling by sand and fines. Thus, hatchery-origin lake trout appeared to recognize substrate appropriate for successful egg incubation.

Type of Publication: Journal Article

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