Resumo. Abstract Aim We used social media posts to describe recreational fishing catches in Cachoeira Porteira, Trombetas River basin, Amazon. Methods We analyzed images and videos publicly shared on Instagram between 2019 and 2024, identifying captured fish species, number of individuals, conservation status, and estimated body size. Results We recorded 245 individuals belonging to 10 families and 18 species, with trophic groups carnivorous (55%) and piscivorous (34%) dominating the catch composition. The most frequently recorded species were Cichla thyrorus (37.2%) and Hoplias aimara (15.8%). Only 6% of individuals were caught below the first gonadal maturation size (L50), composed of three species of large migratory catfishes (Brachyplatystoma filamentosum, Zungaro zungaro, and Phractocephalus hemioliopterus). However, P. hemioliopterus showed a high proportion of catches below its first gonadal maturation size L50 (42%). Conclusions Recreational fishing in Cachoeira Porteira targets mainly large predatory fishes, generally at or above maturation size, but with a considerable proportion of immature large catfishes. Social media provides insights into catch composition and size structure, offering an alternative approach to investigate data-poor Amazonian fisheries.