Abstract
Abstract Hubbard Glacier is expected to dam Russell Fiord and cause glacial flooding of the lower 20 km of the Situk River near Yakutat, Alaska. To determine probable effects of the flooding on juvenile salmonids Oncorhynchus spp., two rotary-screw traps were used to estimate smolt yield inside and outside the predicted flood zone. Traps were fished from April to mid-August 1990: one at the predicted upstream limit of flooding and the other 3 km upstream from the river mouth. Every week, a sample of each salmonid species was tattoo-marked and released 1 km above each trap; recaptures were used to expand catches to estimate smolt yield. Trap efficiency ranged widely among species, from 3% for steelhead O. mykiss to 24% for chinook salmon O. tshawytscha. Estimated total smolt yields were 900,000 sockeye salmon O. nerka, 213,000 coho salmon O. kisutch, 67,000 chinook salmon, and 26,000 steelhead; only sockeye salmon (34% of this species' smolts) originated in the flood zone. Estimated mortality between traps...
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