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We report an unusual high density of the foureye butterflyfish (Chaetodon capistratus) in Punta Francés coral reef, Isle of Youth, Cuba. Foureye butterflyfish were swimming together in associations of 10 to 34 individuals throughout a survey carried out on spur and groove habitat, in July, 2014. This species is commonly observed single or in pairs in the Caribbean coral reefs, tending to contribute significantly to the reef fish abundance in the region. We consider important to record this particular behavior, despite we are unable to explain the causes with the current available data.   Received: 08-02-2022 Accepted: 05-07-2022 Editor: Leandro Rodríguez-Viera