Biologically, one toxin plus one toxin, does not equate double the toxicity effect. Studies show you can get a multiplying toxicity damaging effect 10 to 20 times greater. The organism becomes overloaded dealing with too much toxic stress at once.
Like the human embryo, embryonic sea life, including fish eggs, are hypersensitive to radioactive contamination. This massive amount of radioactive environment pollution continually following into the Pacific Ocean from the Fukushima Catastrophe site has resulted in the Northern Pacific Ocean food supply crashing! As a result there are numerous reports of Northern Pacific fish stocks crashing, plus reports of seals, whales and birds etc., washing up on the west coast of North America, starving to death.