1. Mutual Slaughter: This situation frequently happens to jars with high shrimp density. The shrimps just after decorticating are oftentimes the targets attacked by the same species. The prevention is to densely plant watergrass with the shelter places allowable for shrimps. 　 　 2. Frost Killing: Excessively low water temperature will impeded the biological activities of shrimps with temperature limitation rated at 10 celsius degrees. Water temperature below 10 celsius degrees will cause fatality. 　 　 3. Planaria Attack: The planaria in jars will pose huge menace to shrimps. In special, weak adult shrimps and newly born shrimps will become the attack targets. 　 　 4. Jump-off Jar: Slightly lower water level to the full volume is highly recommended preferably with 6cm distant from the full volume line. 　 　 5. Egg-embrace Death: This death is oftentimes attributed to deteriorated water quality or incomplete decorticatie. 　 　 6. Unhealthy Individual: It is hard to determine whether a shrimp is healthy or not. On the whole, the unhealthy shrimps can be determined from the turbidity of body color and the phenomenon with slowly swinging tails. 　 　 7. Disease Fatality: Any dead shrimp infected with bacteria should be removed from jar immediately to avoid infection to other living shrimps. 　 　 8. Unknown Cause: This is exactly the most dangerous signal and this situation will make shrimps with delayed biological activities. Thereafter, body color will result in bad turbidity and death finally. 　 　 9. Shock Death: This phenomenon frequently happens to dramatic changes happening to water temperature and PH values. Thus, water quality is a critical matter.