Wild fish have gained access to these undrainable SDAE - Chibuto ponds and thus this Clarias came in through either flooding or walked in overland (walking catfish) during a wet or humid period. The carrying capacity of a pond may be in the purposefully cultivated fish (tilapia in this case) or, if wild fish get in, a combination of cultured fish and wild fish. This generally reduces the size of the target fish and produces kilograms of unwanted wild fish.