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Diet of the freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) on Marajó Island (Pará, Brazil)

2010; Instituto Internacional de Ecologia (Brazil); Volume: 70; Issue: 1 Linguagem: Inglês

10.1590/s1519-69842010000100022

ISSN

1678-4375

Autores

M P de Almeida, PMO. Lins, Patrícia Charvet, Ronaldo Borges Barthem,

Tópico(s)

Fish Biology and Ecology Studies

Resumo

The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated. The level of repletion 1 (¼ full) was the most representative for both sexes, as well as for immature and mature specimens. Most of the food items found were well-digested. The food items identification indicated the presence of 15 orders, including insects, mollusks, crustaceans, annelids and fish. Differences in diet were observed among the locations studied when comparing %IRI, crustaceans being the most preferred in Afuá, fish in Lake Arari and mollusks in Muaná.

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