FEEDING HABITS OF THE ATLANTIC SPOTTED DOLPHIN, Stenella frontalis, IN SOUTHEASTERN BRAZIL

This study presents new information on the feeding habits of the Atlantic spotted dolphins, Stenella frontalis, in the Western South Atlantic. Nine stomach contents of S. frontalis incidentally caught in fishing operations conducted by the gillnet fleet based on main harbour of Cananeia (25[degrees]...

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Bibliographic Details
Published in:Brazilian journal of oceanography 2012-04, Vol.60 (2), p.189-198
Main Authors: Lopes, Xenia Moreira, Santos, Marcos Cesar de Oliveira, da Silva, Ednilson, Bassoi, Manuela, dos Santos, Roberta Aguiar
Format: Article
Language:English
Subjects:
Cetacea
Merluccidae
Merluccius hubbsi
Paralonchurus brasiliensis
Scombridae
Stenella frontalis
Tremoctopodidae
Trichiuridae
Trichiurus lepturus
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Summary:This study presents new information on the feeding habits of the Atlantic spotted dolphins, Stenella frontalis, in the Western South Atlantic. Nine stomach contents of S. frontalis incidentally caught in fishing operations conducted by the gillnet fleet based on main harbour of Cananeia (25[degrees]00'S; 47[degrees]55'W), southeastern Brazil, were analyzed. These specimens were captured between 2005 and 2007. A total of 1 422 cephalopod beaks, 147 otoliths and three crustaceans were recovered from the stomach contents. The dolphins assessed preyed on at least eight different fish species of the families Trichiuridae, Carangidae, Sparidae, Merluccidae, Engraulidae, Sciaenidae, Congridae and Scombridae, five cephalopod species of the families Loliginidae, Sepiolidae, Tremoctopodidae and Thysanoteuthidae, and one shrimp species of the Penaeidae family. Based on the analysis of the Index of Relative Importance (IRI), the Atlantic cutlassfish, Trichiurus lepturus, was the most important fish species represented. Of the cephalopods, the squid Doryteuthis plei was by far the most representative species. Several items were reported for the first time as prey of the S. frontalis: Xiphopenaeus kroyeri, Tremoctopus violaceus, Semirossia tenera, Merluccius hubbsi, Pagrus pagrus and Paralonchurus brasiliensis. S. frontalis presented teuthophagous and ichthyofagous feeding habits, with apparent predominance of the first, and preyed mainly on pelagic and demersal items.Original Abstract: O presente estudo apresenta novas informacoes sobre os habitos alimentares de golfinhos-pintados-do-Atlantico, Stenella frontalis, no Atlantico Sudoeste. Foram analisados nove conteudos estomacais de S. frontalis acidentalmente capturados em operacoes de pesca entre 2005 e 2007 pela frota pesqueira do municipio de Cananeia (25[degrees]00'S; 47[degrees]55'W), sudeste do Brasil. Foram recuperados dos conteudos estomacais 1 422 bicos de cefalopodes, 147 otolitos e tres camaroes. Dos itens analisados, foram reportados um minimo de oito especies de peixes pertencentes as familias Trichiuridae, Carangidae, Sparidae, Merluccidae, Engraulidae, Sciaenidae, Congridae e Scombridae, cinco especies de cefalopodes pertencentes as familias Loliginidae, Sepiolidae, Tremoctopodidae e Thysanoteuthidae, e uma especie de camarao da familia Penaeidae. Com base no Indice de Importancia Relativa (IRI), o peixe-espada, Trichiurus lepturus, correspondeu a especie de peixe com maior importancia. Entre os cefalopo
ISSN:1982-436X
DOI:10.1590/S1679-87592012000200009