"...push on harder, pummel it even harder, harvest even the last one- go to any length like a crack addicted drug addict to get the chrome fix. " Agree that a lot of it requires at least hip boots to wade through, but he does hit some nails.
I have never heard anything about the ocean currently contributing significantly to the LO Alewife population. The issue here, at least hypothetically, is that the longer periods of ice cover and assumed resultant reduction in phytoplankton and zooplankton biomass, and the longer periods of cold temperatures, cause increased thiaminase production in the alewifes, who also suffer in terms of body condition from less available food and the harsher conditions. The predator gets a higher dose of thiaminase in each prey fish consumed, and has to consume more prey fish per unit of energy needed, and as a result is not able to get enough Vitamin B for maintenance of metabolism. After one bad winter in 2014, this exhibited most dramatically as the chrome die off in the SR. Then, a second winter even worse than the first, and the deep lake pretty much shut down after mid-June. It seems logical that if this condition became advanced enough in large numbers of the trout and salmon out in the lake in 2015, they hit the bottom instead of making into the tributaries. Some of the fish survived, but no where's near what would be expected from "normal recruitment" (I've seen west coast numbers where 1-2% return is considered good, but we don't have seals and seal lions and Orcas and the commercial and Native American fleets in LO!), and the Salmon and Steelhead were both affected (I saw pretty good numbers of browns in the CNY tribs I have been on, maybe they are more focused on the gobies). A silver lining in all this for the long run is that as long as the hatchery is selecting the healthiest fish, these are possibly individuals with a genetic resistance to the thiaminase, as they have some how managed to survive and make it back to the hatchery, so the genepool gets "stronger." But if it takes a long time to get things "back on track," it's little consolation for geezers like me and Twobob.