Chitosan with small content in the feed ( - ) could be selected to prepare shrimp feed-pellet having so high water-stability that met the Standard of Vietnam Ministry of Fisheries 28-TCN 102/1997. The radiation treatment at sterilization doses (20 - 30 kGy) was evaluated as the most practical technology because irradiated chitosan with reduced content of has capacity to be prepared feed-pellets as stable as comparable to imported products.