“The radioactive substances emitted into the atmosphere by the Fukushima Daiichi Nuclear Power Plant (NPP) accident have contaminated seawater and fresh water by various channels, and over time, they will gradually settle into the ocean floor and riverbeds…Regular measurements (as a rule, once a week) are taken at key ports when major coastal species and migratory species are landed. Monitoring in the five prefectures of Fukushima, Miyagi, Ibaraki, Iwate, and Chiba has been improved in light of the new standards for radioactive substance levels which came into force in April 2012.”
This source mainly serves to help visualize the scale of impact of the Fukushima nuclear disaster on Japan's East Coast fishery business. From the cascade of several white dots on the map, this displays how widespread radioactivity was within the aquatic ecosystems of the coast, thus rendering a significant portion of Japan's fishery trade unprofitable during the time period. The image description from the apan Ministry of Agriculture, Forestry, and Fisheries report reads as follows: “The radioactive substances emitted into the atmosphere by the Fukushima Daiichi Nuclear Power Plant (NPP) accident have contaminated seawater and fresh water by various channels, and over time, they will gradually settle into the ocean floor and riverbeds…Regular measurements (as a rule, once a week) are taken at key ports when major coastal species and migratory species are landed. Monitoring in the five prefectures of Fukushima, Miyagi, Ibaraki, Iwate, and Chiba has been improved in light of the new standards for radioactive substance levels which came into force in April 2012.”