Could the lake be seeded to increase the food supply or would the negative effects offset any benefit?
I will repeat from the information provided during the presentation - there is no lack of food for the sockeye up to a population of 100MM. The highest total number of fry in the lake was in 2012 and it was estimated at 72MM. Those are NOT my figures but I believe I am reiterating accurately what was presented.
It was postulated that the cleaning of the lake of untreated sewage reduced the growth of algae which in turn made for clearer water making it easier for sight predators to take sockeye.
While I am sure I disagree with the WA DOE's assertion as reported by CM as it might apply to Lake WA I am also sure no one will go on record advocating sewage into the lake. However, if northern pikeminnow are a significant predator then how might they and other predators be reduced in number keeping in mind that 98% of the fry never make it out of the lake? Maybe a bounty system like on the Columbia River?
As for spawner loss there needs to be some creative thinking applied; capture off Golden Gardens and move quickly into the lake for release? Apparently there was some discussion about piping cool water out of the deeper part of the lake but that was considered extremely expensive.
Anyway, just some thoughts for consideration rather than capitulating before trying to mitigate the several limiting factors.