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We conducted an experiment to determine phototaxis in bonytail Gila elegans, a Colorado River basin endemic fish. We tested groups of 50 protolarvae (6.1-8.9 mm total length) in darkness for 2 h or 4 h with illuminated (lighted) and nonilluminated (unlighted) traps suspended in aquaria in pairs (one lighted and one unlighted, two lighted, or two un...