I'm not part of the control personnel, so I couldn't give you the exact data, but my understanding is that the present sea lamprey control still relies very heavily on pesticide application, because frankly that is, at the present time, the most efficient way of killing sea lamprey.
There might have been some reduction, but certainly not to the extent that they had hoped to achieve. The pheromone research has been going on for at least that length of time, if not longer, and it has shown quite positive signs in terms of achieving good success in getting lamprey to respond to pheromones. There have been some field tests to show efficacy, but to my knowledge pheromones have not been utilized on a large scale for control purposes. I literally just received money last year to do research on the repellents that I propose, so I'll be doing the first experiments this summer.
Another gentleman, who is working on this in parallel, did a set of experiments last summer. To make a long story short, at the present time I don't think that the Great Lakes Fishery Commission is anywhere close to meeting its target of reducing pesticide application.