The Shortnose Cisco was endemic to lakes Huron, Michigan and Ontario. However, it has not been recorded since 1964 in Lake Ontario, 1982 in Lake Michigan and 1985 in Lake Huron, and is, therefore, considered extirpated (no longer exists in the wild). It will be considered extinct only after 50 years has passed since it was last recorded.
Very little is known about the habitat preferences and life history of the Shortnose Cisco. It was a deepwater fish that lived in a clear, cold-water environment all year long. It has been collected in water depths ranging from 22 to 110 m. The Shortnose Cisco was the only known spring-spawning cisco in the lakes where it occurred and likely migrated to deep water for spawning. Sexual maturity was reached at two to three years. The maximum age was eleven years for females and nine years for males. It was prey for Burbot (Lota lota) and deepwater forms of Lake Trout (Salvelinus namaycush).
Source: Wikipedia
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