Abstract
Fluorescent polystyrene pigment was used to mark juvenile spring chinook salmon (Oncorhynchns tshawytscha) and steelhead (Salmo gairdneri) released from Cole Rivers Hatchery on the Rogue River, Oregon. Sixty percent of the adult spring chinook salmon retained the pigment marks for up to 54 months, and two-thirds of the adult summer steelhead retained the marks for 56 months. Reductions in pigment retention were associated with (1) changes in the skin during gonadal maturation, (2) sexually dimorphic skin characteristics resulting in lower retention rates for males than females, and (3) size of the fish. Greater error was found in correctly identifying fish marked with two dyes of different colors than with one.
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