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COSEWIC Assessment and Update Status Report on the Banded Killifish, Newfoundland population in Canada

Technical Summary

Fundulus diaphanus

Common name: Banded Killifish, Swimp (NF name) (English)
Fondule barre (French)

Range of occurrence in Canada: Newfoundland Population (also occurs in MB, ON, QC, PE, NB, NS)

Extent and Area Information

extent of occurrence (EO) – in Newfoundland

< 50 000 km2



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


area of occupancy (AO)

< 200 (km2)



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


number of extant locations


trend in # locations


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


habitat trend: (in area, extent or quality of habitat)

Stable (only accessible in coastal regions)

Population Information

generation time (average age of parents in the population)

Mature at 1+ years

number of mature individuals (capable of reproduction) in the Canadian population

Not Known

total population trend


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


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)?


list of each population and the number of mature individuals in each

Indian Bay - 1 209-20 569
Loch Leven - Unknown
Stephenville Crossing - Unknown
Ramea Island - Unknown
Winterland - Unknown
Freshwater Pond - Unknown
Grand Bay West - Unknown

trend in number of populations


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



  • Populations may be impacted by increased sedimentation resulting from logging, particularly in the Indian Bay area.
  • Populations would be vulnerable to any disturbance impacting on water quality or macrophyte communities due to their restricted ranges and close proximity to one another.

Rescue Effect: Unlikely

does species exist elsewhere (in Canada or outside)?


status of the outside population(s)?
(see existing status below)

Secure in Canada with the possible exception of Manitoba and Quebec. Nearest US populations are secure.

is immigration known or possible?


would immigrants be adapted to survive here?


is there sufficient habitat for immigrants here?


Quantitative Analysis

Not available