Recent investigations have shown that whales and dolphins caught off the coast of Japan are highly contaminated by DDT, dioxin, PCBs, and methylmercury.
ت .‏ ،‏ الديوكسين ،‏ مركَّبات ثنائي الفنيل المتعدِّد الكَلْوَرة PCBs‏ ،‏ ومتيل الزئبق .‏