. The Canadian field-naturalist. 164 The Canadian Field-Naturalist Vol. 103. 5CM Figure 1. Bloater, Coregonus hoyi (from Todd 1980, by permission). (1980) had considered the species probably extirpated in Lake Ontario, but the 1982 record indicates the population may still be present. Coregonus hoyi populations increased dramati- cally in Lake Michigan during the 1940s and 1950s following a decline in predators and larger deepwater cisco competitors (Moffet 1957; Smith 1964). Subsequent overexploitation and recruit- ment failure resulting from a highly unbalanced sex ratio (female-biased), led
. The Canadian field-naturalist. 164 The Canadian Field-Naturalist Vol. 103. 5CM Figure 1. Bloater, Coregonus hoyi (from Todd 1980, by permission). (1980) had considered the species probably extirpated in Lake Ontario, but the 1982 record indicates the population may still be present. Coregonus hoyi populations increased dramati- cally in Lake Michigan during the 1940s and 1950s following a decline in predators and larger deepwater cisco competitors (Moffet 1957; Smith 1964). Subsequent overexploitation and recruit- ment failure resulting from a highly unbalanced sex ratio (female-biased), led to a dramatic decline in abundance by 1976, when the fishery for deepwater cisco was closed (Brown 1970; Wells and McLain 1973; Holey 1983). Populations have since rebounded and limited quota fisheries have been reopened in Wisconsin (Holey 1983), Michigan (A. Wright, personal communication), and Illinois (R. Hess, Illinois Department of Conservation, Zion, Illinois, personal communica- tion) waters of Lake Michigan. Coregonus hoyi now constitutes from 90 to 99% of the commercial catches of deepwater ciscoes in these Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
Size: 2407px × 1038px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1910, bookyear1919
