Persistent organic pollutants, Blubber, Contamination assessment, Stenella frontalis, Polychlorinated Biphenyls - analysis, Environmental Monitoring, DDT - analysis, Male, Halogenated Diphenyl Ethers - analysis, Water Pollutants, Chemical - analysis, Stenella, Hexachlorobenzene - analysis, Animals, Biopsy, Female, Adipose Tissue - chemistry, Chlordan - analy...