The Brazilian damsel fish Stegastes fuscus (Cuvier, 1830) (Osteichthyes: Pomacentridae) is commonly found in the coastal reefs of Northeastern Brazil near the equatorial line (06°00′40′′S). This fish is nocturnal, generally inhabiting shallow areas (<8 meters of depth) of biogenic or rocky reef pools. The diet of the adultS. fuscus is mainly of algae, but animal items have also been observed [6]. This trophic plasticity is explained by the greater need for protein for rapid growth during the initial phase of life [7].Despite its small size and low commercial value, S. fuscus is an important link in the trophic dynamics of tropical reef ecosystems [8]. The current study was carried out to provide information on the morphohistology of the digestive tract of the damsel fish S. fuscus
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