Pattern of Shoreline Spawning by Sockeye Salmon in a Glacially Turbid Lake: Evidence for Subpopulation Differentiation
- 1 January 1995
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 124 (1) , 1-15
- https://doi.org/10.1577/1548-8659(1995)124<0001:possbs>2.3.co;2
Abstract
Alaskan sockeye salmon Oncorhynchus nerka typically spawn in lake tributaries during summer (early run) and along clear-water lake shorelines and outlet rivers during fall (late run). Production at the glacially turbid Tustumena Lake and its outlet, the Kasilof River (south-central Alaska), was thought to be limited to a single run of sockeye salmon that spawned in the lake's clear-water tributaries. However. up to 40% of the returning sockeye salmon enumerated by sonar as they entered the lake could not be accounted for during lake tributary surveys, which suggested either substantial counting errors or that a large number of fish spawned in the lake itself. Lake shoreline spawning had not been documented in a glacially turbid system. We determined the distribution and pattern of sockeye salmon spawning in the Tustumena Lake system from 1989 to 1991 based on fish collected and radiotagged in the Kasilof River. Spawning areas and times were determined for 324 of 413 sockeye salmon tracked upstrea...Keywords
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