If you frequent lakes in the Northwoods, you know that invasive species are a big problem. Take rainbow smelt – the tiny fish are known for outcompeting native fish and devouring their young. Once rainbow smelt get into a lake, it can be all but impossible to get rid of. Some approaches rely on chemicals that wipe out all fish species. But one project out of UW’s Trout Lake Research Station is experimenting with a new technique that could have many fewer side effects than the chemical method.