The plague of radioactive water at the wrecked Fukushima No. 1 power plant has renewed fears both in Japan and abroad over the contamination of seafood and the habitat it comes from.

The government is trying to reassure consumers that all fish that find their way to market are safe, pointing to marine life sampling data and regulations regarding shipment of contaminated marine products.

But how safe — or dangerous — could fish caught in the Pacific be? On what data and safety standards is the government basing its claims of safety?