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Report: The Lake Trout of Tutshi Lake. Life History and Preliminary Assessment of Annual Sustainable Yield 1987 (00051TUTR)

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A limnological and fish sampling survey was conducted on Tutshi Lake in September 1987. It was determined that Tutshi was a large, cold, oligotrophic lake. A total of 96 lake trout (salvelinus namaycush) ranging in size from 13.0 to 88.4 cm and in age from 5 to 40 years were captured in 89 hours of gillnetting.

Author:  Hatlevik, S.P.

Old Reference Number:  sk67

Date Published:  Mar 1990

Report ID:  2559

Audience:  Government and Public

A limnological and fish sampling survey was conducted on Tutshi Lake in September 1987. It was determined that Tutshi was a large, cold, oligotrophic lake. A total of 96 lake trout (salvelinus namaycush) ranging in size from 13.0 to 88.4 cm and in age from 5 to 40 years were captured in 89 hours of gillnetting. Only four fish exceeded 50 cm, and there was some concern and speculation over the lack of larger fish in the sample. By comparison to other northern lakes surveyed in Skeena Region, lake trout from Tutshi were generally smaller. Growth rates were fairly rapid up to 11 years and 45 cm after which growth slowed markedly. Theoretically, Tutshi could provide an annual sustained yield of 1754 kg of lake trout or approximately 1763 fish weighing about one kg (average length 43 cm). Spring sampling is recommended to obtain a more representative sample of the lake trout population. Due to the vulnerability of lake trout to exploitation, more stringent angling regulations should be considered.

Report Type
  Fish and Aquatic Habitat Information
 
Subject
  Fish Species - Lake Trout (Char) - Salvelinus namaycush
  Region - Skeena
  Fish and Fish Habitat - Lake
  Fish and Fish Habitat - Stock Assessment
  Watershed Groups - 836 - Tutshi River
 


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