Coregonus nigripinnis
Blackfin cisco

Key Characteristics

The blackfin cisco is usually characterized by darkly pigmented fins and a deep body. Its body is elongate, distinctly laterally compressed, and deep, with the greatest body depth in front of the dorsal fin. The head is triangular with a blunt snout blunt that is usually greater than eye diameter in length. Their overall coloration is dark silvery, with pink or purple iridescence on sides, and with a back that is dark green to black and silvery below.

Status and Rank

  • State Status: X
  • State Rank: SX
  • Global Rank: G1Q

Occurrences

No known occurrences in Michigan

Updated 7/21/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

This species was once found at depths of 110 to 146 m in lakes Michigan and Huron.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Management

Decline and extirpation of this species was due to overfishing, sea lamprey introduction, and introgressive hybridization (NatureServe).

Active Period

Spawning from third week of September to second week of December

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Oct 19, 2017]

References

Survey References

Technical References

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