Coregonus johannae
Deepwater cisco

Key Characteristics

This cisco species has a terminal mouth and the pre-dorsal length is much greater than the post-dorsal length. The deepwater cisco has between 27 and 33 gill rakers on the anterior arch.

Status and Rank

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

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 found in large lakes at depths of 30-185 m, but rarely caught at less than 64 m.

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

This species was last captured in 1951 and is presumed extinct.

Active Period

Spawning from first week of August to fourth week of August

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Nov 17, 2017]

References

Survey References

Technical References

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