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COSEWIC Assessment and Update Status Report on the Blackfin Cisco in Canada

Technical Summary

Coregonus nigripinnis

Blackfin cisco
Cisco à nageoires noires

Range of Occurrence in Canada: Ontario


Extent and Area Information

extent of occurrence (EO) (Polygon using Figure 2)
Measured as total area of Lake Nipigon
< 740 000 km2



specify trend (decline, stable, increasing, unknown)

Unknown


are there extreme fluctuations in EO (> 1 order of magnitude)?

Unknown


area of occupancy (AO) (The AO is restricted to the deeper waters of the lake, and thus would only be a fraction of the EO)

Unknown




specify trend (decline, stable, increasing, unknown)

Unknown


are there extreme fluctuations in AO (> 1 order magnitude)?

No


number of extant locations (Includes the Little Jackfish River – fish found there are probably migrants from Lake Nipigon)

Unknown




specify trend in # locations (decline, stable, increasing, unknown)

Unknown


are there extreme fluctuations in # locations (>1 order of magnitude)?

No


habitat trend: specify declining, stable, increasing or unknown trend in area, extent or quality of habitat

Unknown



Population Information

generation time (average age of parents in the population) (indicate years, months, days, etc.)
7.5 yr



number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values)

Unknown




total population trend: specify declining, stable, increasing or unknown trend in number of mature individuals

Unknown



if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)

Unknown




are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?

Unknown



is the total population severely fragmented (most individuals found within small and relatively isolated (geographically or otherwise) populations between which there is little exchange, i.e., ≤ 1 successful migrant / year)?

No







list each population and the number of mature individuals in each

Unknown


specify trend in number of populations (decline, stable, increasing, unknown)

Unknown


are there extreme fluctuations in number of populations (>1 order of magnitude)?

No



Threats (actual or imminent threats to populations or habitats)

  • Exploitation – continued presence as incidental catch in Lake Nipigon commercial fishery;
  • historically – overfishing in lake Huron
  • Competition with introduced exotics such as rainbow smelt, and spiny water flea
  • Possible Introgressive Hybridization


Rescue Effect (immigration from an outside source): None

does species exist elsewhere (in Canada or outside)?
No


status of the outside population(s)?
N/A

is immigration known or possible?
No

would immigrants be adapted to survive here?
N/A


is there sufficient habitat for immigrants here?
N/A



Quantitative Analysis

N/A


Status and Reasons for Designation

Status: Data Deficient
Alpha-numeric code: Not Applicable

Reasons for Designation: Uncertainty about whether or not we are dealing with ecomorphotypes of a common and widespread species (C. artedii), or distinct populations of blackfin cisco (C. nigripinnis), cannot be resolved with the information presently available. Given this uncertainty, COSEWIC cannot unambiguously define which units it would be assessing. However, COSEWIC notes that whatever the systematic status, there are distinct coregonids in these lakes that warrant enhanced conservation and protection. The uncertainty of systematic status can probably only be resolved through a comprehensive taxonomic/systematic review of the sub-genus.


Applicability of Criteria

Criterion A (Declining Total Population):
Not Applicable – taxonomy uncertain.

Criterion B (Small Distribution, and Decline or Fluctuation):
Not Applicable – taxonomy uncertain.

Criterion C (Small Total Population Size and Decline):
Not Applicable – taxonomy uncertain.

Criterion D (Very Small Population or Restricted Distribution):
Not Applicable – taxonomy uncertain.

Criterion E (Quantitative Analysis):
Not Applicable – No data.