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Sotalia fluviatilis known as tucuxi dolphins is considered the only dolphins exclusively fluvial. According to IBAMA, is classified as a species of "insufficient data". The objective of this paper is to describe the frequency of occurrence of the species S. fluviatilis in Porto of Acai in Santana, Amapa. The study was conducted through on-site observations and the count of observations of individuals. For three months of activity on the field for 4 hours a week, there were 102 sightings, suggesting a habitat preference of these animals in that area of study. Keywords: Sotalia fluviatilis ; Delphinidae; Amazon basin.

Frequência de Avistamentos do Boto Tucuxi, Sotalia fluviatilis (Odontoceti: Delphinidae) em Área de Entorno da Ilha de Santana, Macapá, Amapá, Brasil