1. Radioisotope Laboratory, Biophysics Institute, Rio de Janeiro Federal University (UFRJ), Brazil, Aquatic Mammal Laboratory (MAQUA), Oceanography Faculty, Rio de Janeiro State University (UERJ), Brazil, Laboratory for Ecophysiology, Biochemistry and Toxicology, Department of Biology, University of Antwerp, Belgium, and Laboratory for Oceanology, MARE Center, Liege University, Belgium