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1 December 2003 Analysis of Three Cisco Forms (Coregonus, Salmonidae) from Lake Saganaga and Adjacent Lakes Near the Minnesota/Ontario Border
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Abstract

Based on examination of 655 ciscoes from Lake Saganaga, a Minnesota/Ontario border lake, three forms, about 90% separable on gill raker counts, are present. Form L, with the lowest gill raker counts (26–40, mean = 31.9, n = 96) is tentatively identified as Coregonus zenithicus. Form M, with intermediate gill raker counts (36–50, mean = 43.1, n = 92) was the only cisco anticipated to occur in lakes of the region and is assumed to represent Coregonus artedi. Form H, with 45–70 gill rakers, mean = 56.1, n = 467, is the most common cisco in the lake. We argue that the appropriate name for this form is Coregonus nipigon. Additional differences among the three forms include lateral-line scale and vertebral counts, gill raker length, body shape, fin pigmentation, size at sexual maturity, and maximum size. Seagull Lake, affluent to Lake Saganaga, contained only C. artedi (n = 108). Gunflint and Magnetic Lakes, also affluents to Lake Saganaga, contained C. artedi (n = 19) and C. zenithicus (n = 29). Lake Saganagons, immediately downstream of Lake Saganaga, based on only eight available specimens, appears to contain C. nipigon (7) and C. artedi (1).

The American Society of Ichthyologists and Herpetologists
David A. Etnier and Christopher E. Skelton "Analysis of Three Cisco Forms (Coregonus, Salmonidae) from Lake Saganaga and Adjacent Lakes Near the Minnesota/Ontario Border," Copeia 2003(4), 739-749, (1 December 2003). https://doi.org/10.1643/IA02-139.1
Accepted: 18 July 2003; Published: 1 December 2003
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