(vasep.com.vn) Vietnam seafood exports earn annual revenue of US$6 billion, however, irrigation system serving for aquaculture has not been developed. As a result, fish farmers and enterprises suffer from loss caused by diseases. The loss was mainly attributable to lack of investments for irrigation system, Mr. Nguyen Huu Dung, Vice Chairman of Vietnam Association of Seafood Exporters and Producers (VASEP) said.