Spawning Migration of Lacustrine‐Adfluvial Bull Trout in a Natural Area

We investigated the spawning migration of lacustrine‐adfluvial bull trout Salvelinus confluentus in the North Fork Skokomish River in Olympic National Park (Washington State) during 1996. Day‐snorkeling and electrofishing were conducted to determine timing and duration of the migration and the distr...

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Published in:Transactions of the American Fisheries Society (1900) 2001-09, Vol.130 (5), p.981-987
Main Authors: Brenkman, Samuel J., Larson, Gary L., Gresswell, Robert E.
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Salvelinus confluentus
Vertebrata
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container_title Transactions of the American Fisheries Society (1900)
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creator Brenkman, Samuel J.
Larson, Gary L.
Gresswell, Robert E.
description We investigated the spawning migration of lacustrine‐adfluvial bull trout Salvelinus confluentus in the North Fork Skokomish River in Olympic National Park (Washington State) during 1996. Day‐snorkeling and electrofishing were conducted to determine timing and duration of the migration and the distribution and abundance of bull trout. The primary spawning migration began in early October and was waning by December. Bull trout migrated 6 km or less up the river from Lake Cushman. Increased river discharge and decreased water temperature appeared to be the primary environmental variables corresponding to the initiation of the migration. Mean length of migratory bull trout increased from June to December. Comparisons with other lacustrine‐adfluvial bull trout populations in Oregon, Montana, Idaho, and British Columbia suggested that these populations exhibit specific migratory strategies related to local environmental conditions.
doi_str_mv 10.1577/1548-8659(2001)130<0981:SMOLAB>2.0.CO;2
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subjects Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Salvelinus confluentus
Vertebrata
title Spawning Migration of Lacustrine‐Adfluvial Bull Trout in a Natural Area
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