The sea lamprey hasn't been as bad...probably in 30 or 40 years. It was probably worse when I was a kid than it is now.
The zebra mussels have been a big problem ever since they came, but the fish are starting to eat zebra mussels. I think in just the last two or three years, some of the whitefish have gone from having very little zebra mussel tissue found in their gullets to now where it's half of what they're eating.
We thought the gobies were going to be a real problem. If the fish is bigger than a goby, it eats the goby. If the goby is bigger than the other fish, the goby eats it. You can cut walleyes open and what you'll find in them are gobies. The bigger the walleye, the bigger the goby inside.