For scientists monitoring the effects of last year's devastating nuclear accident on nearby marine life, one surprising finding stands out: Well over a year after reactor meltdowns released huge amounts of radiation from the Fukushima Daiichi plant into the ocean, some fish caught offshore are still showing extremely high levels of radiation.

That must mean the fish are being exposed to a continuing source of radioactive contamination, writes Ken Buesseler, a marine chemist with the Woods Hole Oceanographic Institution in...