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Fish-associated chemicals enhance phototactic downward swimming in Daphnia. If perch were treated with the antibiotic ampicillin, this enhancement was significantly decreased. Therefore, not fish, but bacteria associated with fish, seem to produce this kairomone. [KEYWORDS: Diel vertical migration; daphnia-hyalina; chemical cues; predator; galeata; behavior

Do bacteria, not fish, produce ‘fish kairomone’?