For NY, I'd look into Golden Shiners. There are no shad species that will survive the winter that won't cause problems down the road.
Here in N. Indiana Gizzard shad can grow from spawning to being too large for LMB to eat in less than a year. The local lake has Gizzard Shad in it. The last gill net survey the DNR did showed that they made up 60% of the fish biomass in the 365 acre lake.
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