Part of what we saw back in the early 1950s, when sea lamprey destroyed the top of the food chain, primarily lake trout, was that the fish on which the top predators feed grew out of control. They couldn't feed either, and the population just exploded. They started to die off. They got washed up on beaches.
If you go back and look at the history of why so many people intervened with both the U.S. and Canadian governments back in those days, a lot of them were cottagers. They weren't necessarily fishers, but they couldn't go to the cottages anymore with tonnes of fish rotting and decaying on beaches. The cottagers couldn't enjoy the beaches just because of the stench. When you interrupt the ecosystem, it has tremendous effects throughout the whole basin.
If I have time, I'll just say as well that a lot of the research we do in support of fisheries goes to identifying habitat that needs to be controlled and rehabilitated and whatnot. The benefits of that are not just for fish, of course. You get into wetland restoration, which has a real economic value. Look at how much a wetland does in terms of removing things from the environment. If they weren't there, you would have to put in sewer management systems and so on.
The impacts are pretty incredible when you look at it from a broad ecosystem perspective.