I don't eat my fish. They are too valuable to eat.
Bombs away with the chlorine when I drain my ponds!
I don't KILL my fish. I try my best to keep them alive. However, if I do decide to kill them, I won't be eating them. So it doesn't matter if I use a plutonium/lead/chrome/cadmium/mercury cocktail.
All seriousness aside, I doubt that bombing a pond with Cl every 5-10 years will build up enough byproducts in the soil to harm fish or fish predators. Regularly dumping swimming pool or clothes washing water into a pond would be far more likely to cause a buildup.
