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Interannual variation of reach specific migratory success for Sacramento River hatchery yearling late-fall run Chinook salmon Oncorhynchus tshawytscha and steelhead trout Oncorhynchus mykiss



Interannual variation of reach specific migratory success for Sacramento River hatchery yearling late-fall run Chinook salmon Oncorhynchus tshawytscha and steelhead trout Oncorhynchus mykiss



Environmental Biology of Fishes 96(2-3): 363-379



The release of hatchery reared salmonid smolts is a common management tool aimed at enhancing depleted wild stocks and maintaining fisheries throughout Northern California and the Pacific Northwest. In the Sacramento River watershed, smolts must migrate through the river, delta and estuary in order to successfully reach the Pacific Ocean. Migration success (success defined as apparent survival from one monitor location to another) may vary between species, year and habitat. We released 5 late-fall run Chinook salmon and 5 steelhead smolts in 29 and 21 in the Sacramento River (river kilometer 27). Each smolt was implanted with a coded ultrasonic tag, which was detected by an array of over 3 underwater receiver stations deployed throughout the system. Less than 25 % of fish migrated successfully to the Pacific Ocean in both years. We found that reach specific success was greater in the Delta in 29 (>6 %) than in 21 (<33 %), whereas this pattern was reversed in the Bay (<57 % in 29, >75 % in 21). Identifying the location, timing and causes of smolt mortality can lead to improved management of the resource.

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Accession: 036421157

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DOI: 10.1007/s10641-012-0037-y


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