Helenice Vital¹, Ruy K Kikuchi², Beatrice Ferreira³, Zelinda Leão², Jorge Eduardo Lins Oliveira⁴, Mauro Maida⁵, Moab Praxedes Gomes¹, Andre Giskard Aquino da Silva¹, Patricia Eichler¹ and Mary Lucia da Silva Nogueira¹, (1)UFRN Federal University of Rio Grande do Norte, Geologia, Natal, Brazil, (2)UFBA Federal University of Bahia, Salvador, Brazil, (3)Universidade Federal de Pernambuco (UFPE), Oceanografia, Recife, Brazil, (4)UFRN Federal University of Rio Grande do Norte, Oceanografia e limnologia, Natal, Brazil, (5)UFPE Federal University of Pernambuco, Oceanografia, Recife, Brazil