
Japanese marine sea slugs photo: John Chapman
Another good news-bad news story. The good news is that the fears of radiation spreading across the Pacific from the Fukushima meltdown following the Japanese tsunami of 2011, have been wildly overstated. Yes, trace elements of radiation traceable to Fukushima have been recorded in Pacific fish, but they are barely above the level of naturally occurring background radiation. Or, as one analysis, described it, “turns out bananas are more radioactive than fish.”
The bad news is that the debris and trash propelled across the Pacific by force of the tsunami have acted as rafts for a wide range of invasive species, mostly invertebrates like mussels, sea anemones and crabs, which have been washing ashore on North American beaches for last seven years. The really bad news is that scientists are observing that many of these species are surviving and may, over time, pose a threat to indigenous plants and animals on the North American Pacific coast.