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Other features
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Contact information
For information on Wisconsin's rare animals, contact:
Rich Staffen
Conservation Biologist
608-266-4340

Pygmy Whitefish (Prosopium coulterii)


Overview

Overview

Pygmy Whitefish (Prosopium coulteri), a fish listed as Special Concern, prefers the deep water, around 46 to 71 meters deep, of Lake Superior. Spawning occurs from November through December. This species is not actively tracked in the Natural Heritage Inventory Database, but it could be tracked in the future if there is further evidence of its decline.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - both state and federal - and the rank (S and G Ranks) for Pygmy Whitefish (Prosopium coulterii). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where occurrences of this species meet NHI data standards and is not meant as a comprehensive map of all observations.

Note: Species recently added to the NHI Working List may temporarily have blank occurrence maps.


Prosopium coulterii is not tracked by the Wisconsin Natural Heritage Inventory Program at this time (this species is not on the NHI Working List).
Summary Information
State Statusnone
Federal Status in Wisconsinnone
State RankS3S4
Global RankG5
Tracked by NHIW
WWAP m-SIN

Species guidance


A guidance document is not available at this time. Use the information from the other tabs and contact local biologists, as needed, to develop management and avoidance strategies.

Photos/Video

Photos


Pygmy Whitefish

Side view of round whitefish (top), pygmy whitefish (middle), lake whitefish (bottom 2): Notice the differences in snout and body shape; round and lake whitefish are juveniles, the pygmy whitefish is an adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up head of round whitefish (top), pygmy whitefish (middle), lake whitefish (bottom): Notice snout shape differences; round and lake whitefish are juveniles, the pygmy whitefish is an adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Side view of pygmy whitefish (top 2) and round whitefish (bottom 2): Notice body and snout shape differences; pygmy whitefish are adults, round whitefish are juveniles.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up head of pygmy whitefish (top) and round whitefish (bottom): Notice snout shape differences; pygmy whitefish is an adult, round whitefish is a juvenile.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Side view of a juvenile (top) and an adult (bottom): Juveniles are similar to adults, although pigment blotches in juveniles are more pronounced.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up flank: The flanks show 55-70 (usually 55-66) lateral line scales, and faint pigment blotches on the dorsal area.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up caudal region: There is an adipose fin, 31-40 (usually 33-37) circumferential and 16-20 caudal peduncle scales.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Side view of a gravid female: Breeders are similar to non-breeders except for many tiny tubercles.

Photo by John Lyons, WDNR.

Pygmy Whitefish

There are 15-23 pyloric caecae; this specimen is a gravid female.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up mouth: The mouth is subterminal and lacks jaw teeth.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Top view of snout: There is a single flap on the nostril.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up gill rakers: There are 16-20 short gill rakers.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up mouth and snout.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up pectoral fin.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up dorsal fin.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up pelvic fin.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Head-on view adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Bottom view adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up anal fin.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Side view adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Side view adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Side view adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Top view adult.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up flank.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up head.

Photo by John Lyons, WDNR.

Pygmy Whitefish

Close-up tail.

Photo by John Lyons, WDNR.


Last revised: Monday, August 13, 2018