Again, I'll defer to Dr. Goddard, but we've certainly had fluctuations in the population despite a fairly aggressive war on sea lamprey over 50-odd years now. The best we can do is keep them to within 90% of what they were at their maximum.
One of the things we haven't talked about a lot is the research. We've alluded to the research a few times. I've not been a part of any organization that does more effective research than this organization, and applies that research quickly. We're looking at a few things now that we're trying to implement or test as alternatives to lampricide. I mentioned pheromones earlier. We've been relatively successful, I would say, at synthesizing pheromones that lamprey use for migration and for reproduction, and we're testing that to attract sea lamprey into areas where we want them to go to for trapping and for false reproduction.
We're also just discovering—it's so sophisticated that we're calling it a repellant at this point—an odour that sea lamprey emit when they die. Other sea lamprey detect this and avoid the areas where dead sea lamprey are. So one of the new terms that we're using—not very sophisticated—is push-pull. If we can perfect the odour to drive them away from streams, and perfect the pheromones to attract them to streams, then we're excited about the opportunities that this represents to help control the population. But that said, it is still extremely difficult to eradicate—extremely difficult.
Dr. Goddard, do you...?