Forget about fish on cocaine. A new study shows that fish given psilocybin from magic mushrooms act less aggressively than usual. This finding, published in Frontiers in Behavioral Neuroscience, highlights the unique effects of this compound on behaviors.
While researchers have examined psilocybin’s impact on humans and other animals, fish are special. Their varied social behaviors can help us understand how substances change reactions. The research marks the first time psilocybin has been shown to reduce aggression in any animal model, suggesting new areas for exploration in neuroscience.
A particularly interesting species in this study is the mangrove rivulus fish, which is known for its aggressive nature and remarkable adaptability. These fish can survive out of water for extended periods and can self-fertilize, which means they are genetically identical within their lineages. “By controlling for genetics, we can focus purely on behavior,” said Dayna Forsyth, the lead researcher.
To test the effects of psilocybin, Forsyth and her team observed how treated and untreated fish interacted. They set up a tank where two fish could see and smell one another but could not physically interact. After exposing one fish to a low dose of psilocybin, researchers looked for changes in behavior when it returned to the tank. They found that the fish doses with psilocybin exhibited less aggressive behaviors, such as darting at their peers, while still participating in social displays.
“We definitely expected all aggressive actions to decrease,” Forsyth noted, surprised that only high-energy aggressiveness was affected. This opens up questions about how psilocybin selectively impacts different types of behavior.
This study adds to a growing interest in how psychoactive substances affect fish. Similar research on salmon showed alarming results regarding cocaine exposure, further pointing toward the dangers of drug pollution in aquatic environments. The intersection of drug exposure in fish and potential effects on humans is particularly intriguing because of our shared neural structures.
Forsyth is keen to explore more. She wonders what would happen with higher doses of psilocybin. Might fish develop a tolerance, returning to their aggressive ways? “It’s crucial to find the lowest effective dose in toxicology studies. But understanding dose tolerance could reveal fascinating insights,” she said.
As researchers continue to explore these questions, the implications reach beyond fish behavior. They might inform our understanding of aggression and mental health treatments in humans, showcasing the interconnectedness of life, whether in the water or on land.
