Study finds white sharks with high levels of mercury, arsenic and lead in their blood

Researchers found high concentrations of mercury, arsenic, and lead, in blood samples obtained from Great white sharks in South Africa. The samples had levels that would be considered toxic to many animals. However, the study found no apparent negative consequences of these heavy metals on several health parameters measured in the sharks, including body condition, total leukocytes, and granulocyte to lymphocyte ratios, suggesting no adverse effects on their immune system.