Question

Using salmon as an example, explain the difference between bioaccumulation and biomagnification. Explain how aquaculture can reduce the risks posed by these phenomena to people who eat fish.

Answer 1

Hi, and welcome to QuestionCove!

The phenomena of bioaccumulation and biomagnification refer to living organisms taking in and storing substances (often harmful or toxic) such that these substances become concentrated within their bodies.
One example, as the question hints, is the accumulation of the heavy metal mercury within the bodies of salmon.
There are many problems this could pose for wildlife, as salmon, for example, are eaten by animals, which in turn are eaten or decomposed back into the environment. Normally, trace amounts of toxic materials will not cause too much harm, but when too much is allowed to build up and concentrate, it could lead to health and environmental issues.

What do you think would happen if we take the animals (like salmon) out of the environment that is exposing them to the toxic substances (like mercury) and put them in a controlled environment in the context of aquaculture (like agriculture, but with water rather than land)? Might this present an opportunity to cut down on bioaccumulation and biomagnification?