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Stomach contents analysis is a very important tool to know the batoids tropho-dynamic and their relationship with the environment. The aim of this research is to know the food preference of nine species of rays caught by artisanal fishing close to Bahia de Tortugas, Baja California Sur. The species in analysis are: Gymnura marmorata, Pseudobatos productus, Hypanus longus, H. dipterurus, Zapteryx exasperata, Rostroraja velezi, Myliobatis californica, Narcine entemedor and Platyrhinoidis triseriata. A total of 830 stomachs were analyzed, where 56% had some type of food and 44% were empty. The advanced digestion of prey was high; however, we recorded nine food groups. The red crab Pleuroncodes planipes as crustacean dominant in six species of rays, followed by the peanut worms Sipunculus spp. and several benthic fishes. During 2013 and 2015, the phenomenon called “the Blob” was present in the study area, causing an increase in the sea surface temperature (1 - 4 ^oC), altering the trophic network consumed by batoids. This environmental change is associates with the presence of the ray R. velezi, in northern sites. Awas observed an increase in the abundance of P. productus, Z. exasperata and M. californica, due to the increase of prey, such as the Pleuroncodes planipes. Therefore, the abundance and distribution of Batoid species in the Northwest of B.C.S., could be associated to environmental conditions, causing the displacement of species, and the increase of food.

Palabras clave: Diet composition; Trophic relationships; Prey; Niche

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