The Southeast Asian Fisheries Development Center (SEAFDEC) has found that fishponds and prawn farms have caused the decline of annual fish harvests. In a study, the Japanese-funded center said that small fishermen lose about 420,000 tons of fish every year due to the conversion of mangrove swamps to fishpond and prawn farms.

Montebon, M. (1991, August 5). Fish farms = low catch. Manila Standard, p. 14.