Psilocybin calms aggressive mangrove rivulus fish without stopping social behavior
Canadian researchers found in October 2026 that low doses of the psychedelic compound psilocybin reduce aggression in mangrove rivulus fish while keeping their normal social interactions intact.
Study examines fish aggression levels
Scientists investigated how the substance affects social behavior among animals. They tested low doses on the amphibious mangrove rivulus species known for fighting. Results showed a significant drop in aggressive attacks after brief exposure.
Behavior remains normal despite treatment
The compound selectively calms escalating aggression rather than suppressing all activity. Normal social interactions continued even when the fish became less hostile. This suggests the drug targets specific behavioral pathways without causing general lethargy.
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