In my experience shiners will spawn, alot... they do like some moving water as that seems to be their natural habitat, even a garden hose into the water brings them all into a big horde. Right now I have probably 3 seperate spawn groups of them in my pond, just from what they have done in the past 4 months. So I guess the simple answer is yes, they do spawn and spawn frequently producing hordes of tiny fry. They seem to grow from 1/4 inch to 1 inch in about 10 days or so.
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