Clint, I think, has it. The alewife is the main prey fish in the lake for all the salmonids, even if some are more opportunistic than the kings, which are herring feeders unless there are none to be had. The heavy stress experienced by the alewife population last winter, which led to a rare spring alewife die-off (even if not the kind of massive dieoff we saw in the 60's), would also have caused a greater production of thiaminase, which would lead to even poorer incorporation of B1 by the predators. Thiamin, B1, is necessary for many areas of the fish's metabolism, and lack of it can even become fatal. The east end of the lake also froze sooner and stayed frozen longer last year, which could have meant greater stress on bait schools at the east end, and a larger impact, including some morbidity out in the deep water, on the salmon. Things at the west end were fine, except for that period in June into July when no one could find fish, and I have not heard reports of problems from west end tribs, they are still reporting healthy catches of browns and steel. Of course, so was Douglaston last I looked.
But there were strong runs of salmon in the Genesee right into early November, and good runs reported in the Oak and 18-mile. If this winter stays cold enough to set up similar conditions, we could see the same thing happening next year. And Dime, you're on it, too, as if the stresses are enough to decrease the alewife population significantly, predators that require alewives (Kings) either shrink in size or numbers, as happened in Michigan (size) and Huron (numbers, the whole fishery collapsed, and is slowly being "rebuilt"), the whole concept of carrying capacity, and the limiting factor for predators is the amount of prey. More opportunistic feeders like steel and browns will switch to alternatives like Gobi when temperatures allow, and emerald shiners or sticklebacks or whatever they can find, but the kings really focus on alewife, so they will be the canary in the coal mine, and maybe we saw one canary tip over last year, and these scurvy (Yea, I know, that's C) steelhead are another bird gasping for air.