Three species of the sergestid shrimps , namely Sergia lucens (Hansen, 1922), S. talismani (Barnard, 1947) and S. prehensilis (Bate, 1881), are described inthis paper. S. prehensilis and S. talismani are new records for Taiwan watersand South China Sea, while S. lucens has long been an important objectivespecies of inshore macrozooplankton fishery in the Tungkang area. These speciesinhabited in almost the same area, but at different depths: S. lucens in theepipelagic layer, S. talismani in the upper mesopelagic, and S. prehensilis inthe lower, and even bathypelagic layers. Diurnal vertical migration occurred forall species: upward migration for feeding in the night and downward in the day.