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Report: A Comparison of Scale, Finray and Otolith Derived Ages in Dolly Varden Char and Cutthroat Trout
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Twenty-four Dolly Varden char from the lower Skeena River and 28 cutthroat trout from Mosquito Lake on the Queen Charlotte Islands were aged independently using finrays, otoliths and scales.
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Author: deLeeuw, A.D.
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Old Reference Number: sk77
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Date Published: Nov 1991
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Report ID: 2567
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Audience: Government and Public
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Twenty-four Dolly Varden char from the lower Skeena River and 28 cutthroat trout from Mosquito Lake on the Queen Charlotte Islands were aged independently using finrays, otoliths and scales.For Dolly Varden char where only finrays and otoliths were used, age uniformity was
obtained for only six fish. Age differences of one and two years occurred in eight cases each (16 fish) while the remaining two fish were aged with a difference of three and four years. Average Dolly
Varden age based on finrays and otoliths was 5.9 and 6.7 years respectively and age class dominance was six years regardless of the method used. For cutthroat trout where all three structures were used for aging, age uniformity was not obtained for a single fish and in only 11 cases was there a pair of identical ages. Maximum individual
age differences of 1, 2, 3, 4 and 5 years accounted for 18.5, 33.3, 26.6, 14.8 and 3.7 percent respectively. Average ages determined from finrays,
otoliths and scales were 6.3, 5.6 and 3.9 years, while the dominant cutthroat trout ages from these structures were 5, 4 and 3 years respectively. Implications of these discrepancies to the management of Dolly Varden and cutthroat trout sport fisheries are discussed.
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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 - Cutthroat Trout (General) - Oncorhynchus clarki |
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Fish Species - Dolly Varden Char - Salvelinus malma |
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Region - Skeena |
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Fish and Fish Habitat - Fish Inventory |
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Fish and Fish Habitat - Management |
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Watershed Groups - 400 - Skeena River |
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Watershed Groups - 950 - Moresby Island Rivers |
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