Psilocybin Selectively Calms Aggressive Fish — SkimNews
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- Psilocybin at low doses significantly reduced aggressive attacks and overall activity in mangrove rivulus fish without disrupting normal social interactions, according to a study published in Frontiers in Behavioral Neuroscience.
- Dayna Forsyth and Dr. Suzie Currie at Acadia University and the University of British Columbia found that high-energy "swimming bursts" — attack behaviors signaling escalating aggression — dropped sharply after 20 minutes of exposure to dissolved psilocybin.
- The effect was selective: energetically costly aggressive behaviors fell while lower-energy social displays like head-on displays remained largely unchanged, suggesting the compound dampens escalated conflict rather than suppressing all behavior.
- Mangrove rivulus fish were chosen for their natural aggression and unusual ability to self-fertilize, letting researchers use three genetically identical lines and attribute behavioral changes to the drug rather than inherited traits.
- The researchers cautioned the fish study is not a human clinical finding — only single short-term doses were tested, and questions remain about duration, repeated exposure, and whether effects translate to people.
Why it matters: The first vertebrate evidence that psilocybin selectively reduces escalated aggression — not blanket sedation — could help researchers isolate which serotonin pathways drive violent conflict across species. Forsyth and Currie's team stresses the work is mechanistic, not therapeutic: it tested single short-term doses in fish, leaving long-term effects and human applicability open.
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