FWIW, I have read that hickory shad do not utilize certain types of artificial fish passages, though Americans don't seem to have any issues. Don't know what the design is of the passage at that dam, but perhaps it is only somewhat effective for all species. As Carl said, it is quite difficult to access the water between the whitewater rapids of Little Falls and the Little Falls Dam, though I imagine shad can access that stretch.
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http://www.tpfr.org
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