Attraction to 3 pest tephritid parakairomone lures (methyl eugenol, trimedlure, and cuelure) of aquatic insects associated with swift-water habitat in representative Hawaiian stream systems is evaluated. Results indicate no attractancy of aquatic insects to methyl eugenol or cuelure. Attractancy is suggested for Hawaiian Orthocladiinae (Diptera: Chironomidae) to trimedlure; however, significant negative effects to stream insect communities are unlikely because total captures were low and likely limited to this family. High variability in aquatic insect response, both within and between streams as well as possible susceptibility to bucket traps suggest that weak-acting lures such as trimedlure are influenced by multiple variables (trap type and placement, season, insect phenology, population characteristics and dynamics, and stream ecotype)