Traditional pond construction and aquaculture technologies mandate the exploitation of limited water resources. The result is often a lowering of water qualilty and quantity available for alternative uses and users. Rainfed ponds might offer a non-polluting alternative, and make fish farming feasible for a wider variety of potential adopters. Microclimatic effects of holding water on the land might also create positive environment impacts on the farm itself, and over a larger area if widely implemented. A pilot study of the technical and economic feasibility of small scale rainfed aquaculture found that these systems can be both profitable and self-sustaining in rural Malawi. In addition, mechanisms which might generate long-term environmental benefits (e.g. improved fertility, soil drainage, crop production and soil moisture), were found to function effectively even in the short term.
Management of rainfed aquaculture on Malawian smallholdings
Brummett, R.E., Chikafumbwa, F.J.K. (1995)
Paper presented at the Pacific Congress on Marine Science and Technology (PACON) Conference on Sustainable Aquaculture. Honolulu, Hawaii, 11-14 June