Radioactive water leaking from the Fukushima Daiichi nuclear plant into the ocean shouldn’t pose much of a threat to sea life: The Pacific Ocean will quickly dilute it to safe levels, an expert says. Radiation is most likely to turn up in seaweed, which soaks up iodine; it's unclear if seaweed is farmed or harvested in the contaminated area. Radioactive cesium is more dangerous than iodine, but it is water soluble and so will leave fish once they exit contaminated areas. The threat to immobile shellfish, however, is much greater.
