I love tuna so this question has been bugging me senselessly.
I am aware that larger fish tend to have more mercury concentration in their flesh than their prey, however, I don't understand how this can be possible.
I understand that there will be more mercury in the large fish than the small fish as it collects in the large fish over time, but why isn't it distributed across a much greater volume of animal tissue, therefore keeping the overall concentration the same?
The only thing I can think is that the larger fish have some reduced capability for excreting mercury. Whatever the reason, why don't we hear about it? Why is it always "bioaccumulation" this or "biomagnification" that?