Adding lime to a pond increases water pH, boosts alkalinity, and acts as a buffer against drastic pH swings, which is crucial for healthy fish reproduction, survival, and preventing fish kills. It increases nutrient availability, boosting pond productivity by promoting beneficial plankton growth.
Coupled with liming, fertilization can increase fish production in your pond by 3 to 4 times. The components in pond fertilizer stimulate the food chain from the bottom up by nourishing microscopic algae called phytoplankton. In ponds, phytoplankton represents the very base of the food chain. In terms of fish production, a healthy plankton "bloom" translates into more, bigger, healthier fish.