. The Canadian field-naturalist. Figure 1. Kiyi, Coregonus kiyi (from Todd (1980) by permission). Population Sizes and Trends Coregonus kiyi was commercially important in Lake Ontario until the late 1930s (Koelz 1929; Pritchard 1931; Christie 1972). Populations declined in Lake Ontario in the 1940s (Stone 1944; Christie 1972), and the last known occurrence of the species was off Oswego, New York, in 1964 (Todd 1978). Recent surveys by the United States Fish and Wildlife Service and the New York Department of Environmental Conservation have not produced further specimens (T. Eckert, New York De
. The Canadian field-naturalist. Figure 1. Kiyi, Coregonus kiyi (from Todd (1980) by permission). Population Sizes and Trends Coregonus kiyi was commercially important in Lake Ontario until the late 1930s (Koelz 1929; Pritchard 1931; Christie 1972). Populations declined in Lake Ontario in the 1940s (Stone 1944; Christie 1972), and the last known occurrence of the species was off Oswego, New York, in 1964 (Todd 1978). Recent surveys by the United States Fish and Wildlife Service and the New York Department of Environmental Conservation have not produced further specimens (T. Eckert, New York Department of Environmental Conserva- tion, Albany, New York, personal communica- tion). Coregonus kiyi is now considered extirpated in Lake Ontario (Todd 1980; W. Dentry, OMNR Lake Ontario Fisheries Assessment Unit, Picton, Ontario, personal communication). Historical information regarding trends in Kiyi populations in Lake Superior is very limited, but. I IGI M 2. Distribution of the Kiyi, Coregonus kiyi: (I) Extant (Todd 19X0); (2) Extremely rare, last specimen 1974 (Todd I97X, 19X0); (3) Extremely rare, last specimen 1973 (Todd 1978, 19X0); (4) Extirpated (Todd 1980). W. McCallum (personal communication) consid- ers the species common in Canadian waters. Capture data indicate that this species has remained relatively common in waters from 1958 to the present (Dryer 1966; Peck 1977; Pratt 1980). Wisconsin considers Coregonus kiyi populations in its jurisdiction to be stable (B. Swanson, Wisconsin Department of Natural Resources, Bayfield, Wisconsin, personal communication). Information regarding populations in Lake Huron is scarce. Koelz (1929) reported the species as widespread at deeper depths in Georgian Bay and the central basin of the main lake. The last known occurrence was at Griffith Island, Georgian Bay, Ontario, in 1973 (Todd 1978). A specimen tentatively identified as Coregonus kiyi, but unconfirmed by the Royal Ontario Museum (ROM), was captured in 1979 (R. Pa
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