The alewife was once the scourge of the Great Lakes. The small, silver herring made its way into the basin through the St. Lawrence River in the late 19th century and proceeded to wreak havoc on the ecosystem. If you were around the region in the 1960s, you might remember the stench of thousands of dead alewives washing up on Great Lakes beaches. Now, scientists are concerned with a decline in the population of this invasive species and how the shrinking numbers of alewives could impact their main predator, the popular Chinook salmon.
Lots of things end up in Great Lakes that shouldn’t be there. Plastic bottles and microbeads, fertilizer runoff from farm fields, and invasive species are only a few. Now, add to that list prescription drugs. Researchers are increasingly worried about how chemicals from prescription medication could be impacting aquatic wildlife.