South Korea announced on Friday that it was banning all fish imports from along Japan’s northeastern coast because of what officials called growing public worry over radioactive water leaking into the Pacific Ocean near the crippled Fukushima Dai-ichi nuclear power plant. Fisheries in Fukushima prefecture are nearly all closed, and fish caught in nearby prefectures are sold on the Japanese market only after tests have shown them to be safe for consumption. However, South Korea’s ban applies to a total of eight prefectures with a combined coastline of more than 700 kilometres (430 miles), regardless of whether…