Chinese shrimp Fenneropenaeus chinensis is a commercially important speciesin China and the natural distribution is confined only in the Bohai Sea, Yellow Seaand the coast of Korean Peninsula. During the 1990s, the yield of Fenneropenaeuschinensis from farming ponds counted for 70% of the total marine shrimp farmingproduction. However, because of the factors of strains, diseases and environment, theyield decreased sharply, which counted for a quarter of the annual harvest in theprosperous stage and t...