Weir Wonderings

Has anyone had any experience with small fish swimming over, or being
swept over, weirs? Do they generally tend to stay away from
unexpected fast-moving currents "into the unknown abyss", or do they
instead tend to like to play with "weir roulette"? I am specifically
thinking right now of mosquito fish, but if anyone has experience with
larger fish, that would be of interest to me as well.

Thank you very much,
David
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