Microalgae are an important source of food for aquaculture and one of the main food groups sources to cultivate bivalve molluscs. Even though those organisms are very versatile and have been studied for years, their full potential is yet to be explored. Primar Aquicultura is an estuarine organic farm that is equipped with the only oyster seed breeding hatchery, focused on the Crassostrea gasar, located in the northeast of Brazil. Although still not very expressive on the national scenario of bivalve molluscs, the production of native oyster seeds is a new approach and possibly viable in order to evolve the culture of oysters in Brazil. In a way to contribute to the cultivation of native oysters, native microalgae obtained from areas with natural occurrence and production of C. gasar in the state of Rio Grande do Norte, Brazil, were studied in regards to their potential of inclusion in the nursing of the C. gasar. In this study, 18 microalgae were isolated at LARBIM/UFPB, three of those presented good performance in massive cultive and were utilized in the nursing of C. gasar. The native and traditional microalgae were selected according to the morphology and size. The feeding during the larviculture was tested in two different treatments, one with native algae an another with traditional algae. This two treatments were performed in triplicate. Each tank was populated with 10,3x106 larvae. Survival of larvae in the treatment with traditional microalgae was significantly higher than the larvae fed with native microalgae