What they -could- do, is impose a "Seasonal Fishing Only" rule, and enforce it, and introduce algae-eating fish to the retention ponds. Once the rainy season subsides and the ponds start returning to normal depth (or drying out, as some do), they open fishing season and tell everyone it's catch and keep, no more catch and release.
That way you don't have to introduce toxic chemicals into the water to kill the algae caused by man-made retention ponds filling up with runoff rainwater.
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