Fingerlings passing through this mesh size are considered suitable for stocking into nursery or growout ponds. Retained fingerlings are discarded or grown for brood fish. Graded fingerlings should grow quickly when stocked into properly managed grow-out ponds. Good nets of proper mesh size are needed and must be maintained. Brood fish may be injured during partial harvesting.
Excessive mortality can result from rough handling.
Water quality may degrade when nets are pulled through the reproduction pond during fingerling harvests. Fresh water must be available at this time and skillful management is needed. Secchi disk - a circular disk measuring approximately 20 cm in diameter which is used to measure the abundance of plankton in water. Funding for this series was provided by the United States Agency for International Development.