Schools of neon tetra fish (Paracheirodon innesi) use queuing to evacuate through narrow spaces without clogging or colliding, according to a study published in Scientific Reports. Aurélie Dupont and colleagues observed neon tetra evacuate in groups of 30 through a narrow opening in a tank, which ranged in diameter from 1.5 to 4 centimetres, in response to the movements of a fishing net. Neon tetra measure approximately 0.5 centimetres wide and 3 centimetres long. The authors observed that fish evacuated at faster rates through larger openings than smaller openings, but that fish evacuating through all sizes of opening tended to do so at a constant rate — with the exception of the last few fish in each group, who tended to exit more slowly.

https://www.miragenews.com/neon-tetra-fish-queue-up-to-dodge-bottlenecks-1050880/

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