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We identified and measured invertebrate prey from 234 age-0 brown trout (Salmo trutta) captured in Douglas Creek, Wyoming during summer 1990. The mean length of invertebrate prey increased as the fish increased from 21 to 65 mm total length. The low variability of invertebrate prey lengths found within individual 5-mm length groups of age-0 brown trout indicates that fish of 21–65 mm are highly selective for specific sizes of invertebrate prey.
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