. The Canadian field-naturalist. 94 The Canadian Field-Naturalist Vol. 102. Figure 2. Distribution of the Shortnose Cisco in Canada. Extant, Georgian Bay (rare to common). 1. Extirpated (Todd 1980). 2. Rare, Lake Huron (T. Todd, personal communication). Habitat Little is known of the degree of habitat specialization of this species. Depth distribution is generally shallower than most other deepwater ciscos, and other than maintaining a close association with the bottom during spawning, Coregonus reighardi apparently inhabits the midwaters during the balance of the year (Stone 1944;Gray 1979).
. The Canadian field-naturalist. 94 The Canadian Field-Naturalist Vol. 102. Figure 2. Distribution of the Shortnose Cisco in Canada. Extant, Georgian Bay (rare to common). 1. Extirpated (Todd 1980). 2. Rare, Lake Huron (T. Todd, personal communication). Habitat Little is known of the degree of habitat specialization of this species. Depth distribution is generally shallower than most other deepwater ciscos, and other than maintaining a close association with the bottom during spawning, Coregonus reighardi apparently inhabits the midwaters during the balance of the year (Stone 1944;Gray 1979). Scott and Grossman (1973) have summarized the depth distribution of Coregonus reighardi in the Great Lakes. In Lake Ontario, this species was reported from depths of 23 to 91 m, with maximum abundance at 77 m. In Lake Michigan Coregonus reighardi were captured from 11 to 165 m. No depth of capture information is available for Lake Huron. Trends in habitat quality specific to the species are unknown as is the rate of habitat change. No specific protection for the habitat of this species exists in Canada or the United States. General Biology Reproductive Capability: Breeding age, breed- ing frequency, fecundity, early life history, age/sex ratio, and structure of populations of this species are unknown. Females outlive males by about two years in Lake Michigan, where females attain an age of 8+ years (Jobes 1943). Growth is slow; Scott and Grossman (1973) have summarized available age/length/weight data for Lake Ontario and Lake Michigan populations. Adults range in length from 170-260 mm Standard Length (Todd 1980). Spawning in Lake Ontario occurred in April and May (Pritchard 1931); in May and June in Lake Michigan (Jobes 1943). Coregonus reighardi is known to aggregate for spawning (Pritchard 1931; Stone 1944; Smith 1964). This is the only deepwater cisco which spawns in the spring. Fecundity and frequency of reproduction are unknown, as is the growth potential. Species Moveme
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