Heavy metal pollution originates from mining, agricultural,and domestic activities, significantly impacting waterresources. It has been reported that between 75% and96% of the world’s seas are contaminated, exposing marinemammals to ecotoxicological effects, with about 60%affected. The data sources used for this research include Scopus, ScienceDirect, Springer, ResearchGate, and the Journalof Wildlife Diseases. Additionally, the PRISMA methodology wasemployed for a systematic review, analyzing 60 articles. The resultsindicate that most studies are from the United States, with theDelphinidae family being the most frequently studied. Furthermore,93% of the studies focus on chronic effects related to bioaccumulationin the liver and kidneys. There is a positive correlation betweenexposure time and concentration differences according to divingdepth. High concentrations of arsenic have been ...