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Report: Tchesinkut Lake, Lake Trout Stock Assessment and Evaluation of Short Set Small Mesh Experimental Gill Netting Procedure (00601FRAN)
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Tchesinkut Lake was sampled during daylight hours between May 28 to 31 using a two short set (min. 1hr) 60ft sinking gill nets per site with three 20ft panels of 1.5 inch, 2.5 inch and 3 inch; and short set (min 1hr) 90m standard Resource
Inventory Committee (RIC) sinking gill nets.
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Author: Giroux, Paul A.
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Old Reference Number: sk132
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Old Reference System: Skeena Fisheries Report
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Date Published: Mar 2002
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Report ID: 2636
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Audience: Government and Public
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Tchesinkut Lake was sampled during daylight hours between May 28 to 31using a two short set (min. 1hr) 60ft sinking gill nets per site with three 20ft panels of 1.5 inch, 2.5 inch and 3 inch; and short set (min 1hr) 90m standard Resource
Inventory Committee (RIC) sinking gill nets. Tchesinkut lake was sampled at an intensity of 1.77 sets per km2 of lake area. Water temperature and dissolved oxygen levels were measure to 30m and the lake was found to be unstratified. Twentyfive
lake trout were captured and ranged from 40 to 70cm in length. All lake trout sampled were less than 15 years of age and catch results were supplied to the creel survey efforts undertaken by Maniwa et al. (2001). Lake trout growth rates showed a significant increase since 1988 and combined with harvest data support the conclusion that Tchesinkut Lakes lake trout population is being over harvested (Maniwa et al. 2001). The short set, small mesh experimental gill nets demonstrated significant bias towards shorter, younger lake trout and lake whitefish when compared against the 90m RIC catch results. Using crew effort over time as an evaluation measure, short set, small mesh gill nets were found to be approximately half as efficient as short set 90m RIC experimental sinking gill nets when comparing lake trout catch results. A lake trout mortality rate of 8 percent was observed for the short set small mesh and 90m sinking gill nets, indicating that the technique shows promise as an effective method for lake trout live capture and release. However, the apparent bias towards smaller and younger fish causes concern for comparing small mesh netting results versus conventional netting techniques using in the past. The comparison of small mesh netting to 90m RIC should remain under study to increase sample size and improve confidence regarding observed size and age bias.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Fish Species - Lake Trout (Char) - Salvelinus namaycush |
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Region - Skeena |
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Fish and Fish Habitat - Lake |
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Fish and Fish Habitat - Management |
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Fish and Fish Habitat - Stock Assessment |
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Watershed Groups - 180 - Nechako |
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