Problem: Researchers want to know how overfishing is impacting fish populations to make decisions about whether new policies are needed to protect fish populations. What empirical evidence could be collected to get an idea of how overfishing is affecting particular populations? Need Assignment Help? Scientists could measure the amount of bycatch. Scientists could measure the amount of money collected by fishermen. Scientists could measure the level of animal waste in the water. Scientists could measure the number of fishermen on the water.