Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations My 85 year old pond

45ACP. if you do not want to breach the dam, AND you want to kill off all the current fish, use a fairly high dose of nothing but Hydrated Lime. The HY lime will turn the water Gin clear, kill every living thing in it (plants and fish), and the high pH will drop back to a safe zone for stocking in only a couple weeks. Scavengers, eagles, buzzards, etc will gorge themselves on the dead fish and do the nasty work of cleaning the carnage for free, and fast. Even if rhe dam needs breached to de-muck (and it will), use Hydrated Lime to kill off all fish with the pond full of water first....let it work 3 days, and then breach...Feel free to send me a PM if you'd like to know more.

EDIT: Hydrated Lime is by far your least expensive option and the best way to ensure no fish are left alive, and water is clear.