Lake Whitefish Lake Simcoe population
Scientific Name: Coregonus clupeaformis
Other/Previous Names: Lake Simcoe Whitefish,Lake Simcoe Whitefish
Taxonomy Group: Fishes
Last COSEWIC Assessment: May 2005
Last COSEWIC Designation: Data Deficient
SARA Status: Schedule 2, Threatened - (SARA Schedule 1 provisions do not apply)
Image of Lake Whitefish
The Lake Simcoe Whitefish has a dark brown to black back, while its sides are silvery and its underparts are whitish. It has small eyes; a snout which extends beyond the mouth; one dorsal fin; a forked caudal fin; and pelvic, anal and pectorals fins. Lake Simcoe Whitefish measure approximately 381 mm in length.
Distribution and Population
The Lake Simcoe Whitefish is a distinct stock of Lake Whitefish found only in Lake Simcoe. The population of Lake Simcoe Whitefish has been steadily declining. A program to restock the lake has been implemented; eggs of Lake Simcoe Whitefish are collected and artificially fertilized during the spawning season.
The water quality of Lake Simcoe has been deteriorating, and the habitat of the whitefish has been changing. Degradation of spawning sites, siltation, algal growth, accumulation of decaying matter, and reduction of the oxygen content of the water are some of the conditions affecting Lake Simcoe and the fish populations found within it.
Spawning occurs in late October and early November and hatching occurs in late April or early May. Lake Simcoe Whitefish reach sexual maturity between the ages of 4 and 8 years.
The degradation of the habitat of the Lake Simcoe Whitefish due to the eutrophication of the lake is a primary limiting factor. Chemical contaminants, which have negative impacts on the fish, are another important limiting factor. Predation by Rainbow Smelt (which were introduced into Lake Simcoe in 1964) may be affecting the survival of larvae and young whitefish.
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
3 record(s) found.
- COSEWIC Status Reports (1 record(s) found.)
- COSEWIC Assessments (1 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
COSEWIC Annual Report - 2005 (2005)2005 Annual Report to the Canadian Endangered Species Conservation Council (CESCC) from the Committee on the Status of Endangered Wildlife in Canada.
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