The hatching of fairy shrimp Branchinella thailandensisfrom Thailand was studied. The fairy shrimp cysts were subjected to different temperature regimes [ambient (26-29oC), 30°C, 32°C, and 34°C] and examined the experimental condition's effect on hatching until no hatching occurred. Results indicated that temperature affects the hatching of the Thai fairy shrimp B. thailandensiscysts. The hatching of the fairy shrimp could occur once at 34oC and can be stimulated at 32oC, but fluctuating temperatures (26-29oC) and 30oC may reduce hatching success. However, the incubation period took longer, and hatching success was extremely low, suspected of improper cysts production technique and processing. In conclusion, the hatching of fairy shrimp B. thailandensiscan be improved at 34oC but optimal at 32oC.