International donors have praised the conclusion of the Khmer Rouge tribunal in the case against prison chief Duch.
The government has been tearing down these kinds of reservoirs since late June, under the new Tonle Sap Authority.
Kem Sokha, president of the Human Rights Party, said in an interview with VOA last week that his party faces repression.
The author of a Khmer Rouge memoir who now lives in the US is raising funds to help education in Cambodia.
Authorities say they are concerned infected pigs are being smuggled in from Thailand and Vietnam.
Hun Sen said the courts had made an independent decision free of political influence.
Duch, whose real name is Kaing Kek Iev, faces the prospect of release at the age of 86.
Following last week's verdict of Duch, 24 of 90 victims who claimed they lost loved ones in his torture center were dismissed.
Trade volume between the two increased more than 120 percent in the first quarter of the year compared to the same period last year.
The decree also follows a 2006 law that provides for military conscription.
On Monday, officials began blood tests of pigs in Kampot, where the latest and most severe outbreak has occurred.
Thirty-seven countries have ratified the 2008 Convention on Cluster Munitions.