Brian from Mackay, Id writes
The Hi-Yield Killzall Aquatic Herbicide is safe around aquatic life when applied as directed on the product label. The product label states, "When emerged infestations require treatment of the total surface area of impounded water, treating the area in strips may avoid oxygen depletion due to decaying vegetation. Oxygen depletion may result in fish kill."
Answer last updated on: 04/22/2020