The good news here is that the levels are lower than that which is deemed hazardous, the bad news is that it wasn’t detected by people being paid to monitor such things, but by some researchers looking at migratory issues.
It is critical that the government get their monitoring in place and in front of these kinds of issues, before the public panics and destroys the fishing industry , which is likely to happen from this anyway. Many people do not trust government monitoring to be accurate and timely.
Pacific bluefin tuna which have migrated from Japan to California have been found to be contaminated with radioactive cesium from the Fukushima nuclear accident, researchers from Stanford’s Hopkins Marine Station in Pacific have reported in PNAS (Proceedings of the National Academy of Sciences). Despite radiation contamination, levels so far detected are well below those considered hazardous for human health, the authors emphasized.