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Feeding habits of Rhizoprionodon porosus were assessed by the analysis of stomach contents of individuals captured by artisanal fisheries. Prey items were identified to the lowest possible taxonomic level and classified according to the Index of Relative Importance (IRI). A total of 76 individuals were analyzed with a predominance of juveniles. Twenty-five stomachs were empty, fourteen contained only amorphous masses, and the remaining (37) had at least one partially digested prey. The predominant items were teleost fishes, present in 40 stomachs (83.8%), followed by crustaceans (18.9%) and mollusks (13.5%), totaling 11 identified taxonomic groups: Clupeidae, Engraulidae, Holocentridae, Ophichtidae, Pomacentridae and Pleuronectoidei (teleost fish); Isopoda, Stomatopoda and Penaeidae (crustaceans), and Octopodidae and Loliginidae (mollusks). No significant differences in food items were found between males and females or between juveniles and adults. The Index of Relative Importance indicated that Rhizoprionodon porosus has piscivorous habits (95.5%), consuming a variety of fish but complementing its diet with crustaceans and mollusks. Similar results have been reported for other Rhizoprionodon species, and this is probably related to their selectivity for fish and to the abundance of this type of prey in the areas where these sharks were taken.

revista nordestina de biologia

Stomach contents of the Caribbean sharpnose shark Rhizoprionodon porosus (Poey, 1864) (Elasmobranchii: Carcharhinidae) from the coast of Paraíba, Brazil