Fertilize initially with 100 pounds per acre of cottonseed meal. Apply 1 to 2 gallons per acre of liquid fertilizer if the bloom thins to a Secchi disk reading of more than 24 inches. Decomposition is slow in cold water, and the excess organic matter will accumulate. During harvest, seine crews may complain about the smell and fish will die in the sump from the poor water quality. Ponds with existing plankton blooms may have high populations of predaceous copepods that can eat fry.
Copepods can literally wipe out all fry in a pond.
This is equal to 0.8 pound per acre-foot. Fry can be stocked the day after Dylox is applied. Check a water sample from treated ponds before stocking, to make sure that the Dylox killed the copepods. In cases where old water will be pumped into an empty pond prior to stocking fry, a filter with a 100 to 150 micron mesh can be used to mechanically remove the large, predatory adult copepods. If a filter is not available, water can be pumped from ponds with existing crops of golden shiners, as the fish will have eaten most of the adult copepods.