Plants and Animals
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
US Status: No Status/Not Listed
State Status: X - Presumed extirpated (legally 'threatened' if rediscovered)
Global Rank: GX - Presumed extinct
State Rank: SX - Presumed extirpated
Occurrences
| County | Number of Occurrences | Year Last Observed |
|---|
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
- Great lake, pelagic, midwater
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 Recommendations
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
Gill nets
Survey Period: From first week of November to fourth week of October
Trawls
Survey Period: From first week of November to fourth week of October
References
Survey References
- Murphy, B.R. and D.W. Willis, eds. 1996. Fisheries Techniques, 2nd ed. American Fisheries Society, Bethesda. 732pp.
Technical References
- Bailey, R.M., W.C. Latta, and G.R. Smith. 2004. An Atlas of Michigan Fishes. Museum of Zoology, University of Michigan, No. 192, Ann Arbor. 215p.
- Evers, D.C. 1994. Endangered and Threatened Wildlife of Michigan. The University of Michigan Press, Ann Arbor. 412pp.
- NatureServe. 2005. NatureServe Explorer: An online encyclopedia of life [web application]. Version 4.5. NatureServe, Arlington, Virginia. Available http://www.natureserve.org/explorer
- Scott, W.B. and E.J. Crossman. 1973. Freshwater fishes of Canada. Bulletin 184, Fisheries Research Board of Canada, Ottawa. 966pp.