Effect of Temperature on the Hatching of Fairy Shrimp Branchinella thailandensis Sanoamuang, Saengphan & Murugan, 2002 (Branchiopoda: Anostraca) from Thailand

Abstract

The hatching of fairy shrimp Branchinella thailandensis from 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. Resultsindicated that temperature affects the hatching of the Thai fairy shrimp B. thailandensis cysts. 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. thailandensis can be improved at 34oC but optimal at 32oC.