It depends on the fish. Some species are a lot more salt sensitive than others. It shouldn't impact threadfin shad though. In areas affected by the tides, they handle brackish water just fine, and that involves a much higher salinity level than you're ever going to see from road brine runoff into a big lake like Center Hill.
That doesn't mean salting the roads is okay for the environment. In particular, it's tough on some species in smaller streams, especially farther down the food chain. But the salt runoff doesn't impact the shad kills. They just get temperature stressed during cold snaps, and then they are more susceptible to disease and other problems that cause die-offs even among the shad that weren't killed by the cold itself.
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