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Abundance, Growth, And Predation By Non-Native Brown Trout In The Trinity River, Ca, Justin S. Alvarez
Abundance, Growth, And Predation By Non-Native Brown Trout In The Trinity River, Ca, Justin S. Alvarez
Cal Poly Humboldt theses and projects
Brown Trout were introduced to the Trinity River in Northern California in the 1890’s. Since 1932, Brown Trout have sustained their population without additional stocking. Over the last 15 years, fisheries managers have been concerned that predation by piscivorous Brown Trout may impede efforts to restore native salmonids, in particular endangered Coho Salmon. I investigated predation by Brown Trout on native fish in the 64 km of the main stem Trinity River below Lewiston Dam. Using a bioenergetics approach parameterized with field measurements of Brown Trout abundance and growth, I estimated the amount of energy needed to sustain the 2015 …