Care needs to be taken not to overstock the ponds or to over-fertilize, which can cause algal blooms and oxygen depletion, leading to large scale mortalities.Įxamples of fish reared in the extensive fish farming system are catfish, carp, and tilapia. Fsh species are tilapia, which feed on algae, catfish, which feed off the pond bed, and species of carp, which feed on zooplankton. The natural balance within the extensive system is maintained by stocking the ponds with a variety of fish occupying different ecological niches. Production of food within the extensive system can be increased by “fertilizing” the pond (e.g. The farmer can regulate the environment of the pond with the help of several fish species and special equipment.Īn extensive fish farming system is based on a semi-natural environment (example existing ponds), with natural food supply to the fish cultured such as algae, crustaceans, and zooplankton, etc. The major feature of such a system is that it is installed in a semi-natural environment, with natural food supply to the cultured fish. The main examples of an Extensive system are a pond or irrigation ditch system.
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