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A estrutura em comprimento dos estoques de quatro espécies de grandes bagres pimelodídeos foi utilizada para se estudar a dinâmica de suas populações na bacia do rio Cuiabá, Pantanal norte. Foram estimados os parâmetros de crescimento, recrutamento e mortalidade para as espécies. Das espécies estudadas o Barbado apresentou o crescimento mais rápido que as demais, que exibiram taxas de crescimento similares. Para o Barbado e o Pintado foram encontrados dois picos anuais de recrutamento, já o Cachara e o Jaú apresentaram um único pico anual. A análise da mortalidade indica que a pesca é uma fonte de mortalidade muito mais importante para o Barbado que para as demais espécies. The length structure of the stocks of four species of large Pimelodidae catfishes was used to study the dynamics of their populations in the Cuiabá river basin, north Pantanal. The estimative of the growth parameters, recruitment and mortality rates for the species were obtained. Among the species studied the Barbado presented the fastest growth than the others. The Pintado, Cachara and Jaú exhibited similar growth rate. For the Barbado and the Pintado we observed two annual picks of recruitment, however the Cachara and the Jaú presented a single annual pick. The analysis of the mortality indicates that the fishing is a source of mortality more important for the Barbado than for the other species

Dinâmica populacional de quatro espécies de grandes bagres na bacia do rio Cuiabá, Pantanal norte, Brasil (Siluriformes, Pimelodidae)