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Abstract: ''Stomach contents were examined from one-year-old and two-year-old wild steelhead trout, Oncorhynchus mykiss, and hatchery-reared steelhead that had been released into the Trinity River a few weeks prior to capture. Significant differences were found in prey composition of stomachs between wild and hatchery fish. Hatchery fish ingested a greater variety of taxa than either age group of wild fish, but contained fewer organisms per fish. Differences in prey ingested by the two age groups of wild steelhead were not significant. Prey of all three groups of fish were dominated by ants, mayflies, caddisflies, and true flies.''