Here's how pesticide math works: 1 + 1 = more than 2.
Here's how pesticide laws and regulations work: 1 + 1 = 2.
You can expose fish to pesticides based on the laws and regulations, and they'll die when the fish do the real pesticide math.
Translated into geeky science language: a new study says the effects of pesticide mixtures on fish is worse than simply adding up the effects of individual pestices. This is a bummer, because the regulations that are supposed to protect fish assume that the effects are additive.
So the fish get hosed.
When will we get smarter about this stuff?