Endocrine-disrupting xenoestrogens in fish may be interfering with male fertility.
Nota del Doctor
Here are some recent videos on xenoestrogens:
Estrogen in Meat, Dairy and Eggs
Alkylphenol Endocrine Disruptors and Allergies
Dairy Estrogen and Male Fertility
Dietary Sources of Alkylphenol Endocrine Disruptors
Male Fertility and Diet
Also check out Xenoestrogens & Early Puberty.
For more context, see my associated blog posts: Mercury Testing Recommended Before Pregnancy; Pollutants in Californian Breast Tissue; Male Fertility and Dietary Pollutants, and Why Are Children Starting Puberty Earlier?