Authorities profit from the trade in mushrooms meant to raise funds for Pyongyang, sources say.
The move violatesUN sanctions on the export of seafood for badly needed foreign cash.
Exhausted by rehearsals for a national holiday, many show anger at being forced to take part, sources say.
The sanctions-hit regime is using the event to entice traders and entrepreneurs to pump money into the country.
Nonconforming fashions and hairstyles are forbidden, with youth groups sent out to force compliance.
Date has not been set for trial of Indonesian Siti Aisyah and Vietnamese Doan Thi Huong to resume.
Business trips, group tours to the capital are blocked until Sept. 5, sources say.
Trading firms rush to sell abandoned stocks amid speculation the jointly operated industrial park may soon reopen.
Export is strictly banned under UN sanctions forcing Pyongyang to give up its nuclear weapons program.
New concerns over product safety are leading to a preference for hard-to-afford medicines made in South Korea.