Combined effects of temperature and salinity on egg hatching rate andincubation time of Penaeus semisulcatus (Decapoda: Penaeidae)

摘要

This study was undertaken to determine the combined effects of temperature and salinity on the incubation time and hatching rate of Penaeus semisulcatus eggs in controlled laboratory conditions. Fertilized eggs, from a female caught in nature and spawned in our laboratory, were stocked in 2-l round bottom glass flasks and received one of nine temperature (24, 28 and 32 degree C) and salinity (30, 35 and 40 ppt) combinations. The eggs hatched in all treatments. The hatching rate increased as salinity increased and was highest at 24 degree C. In terms of hatching rate, the best combinations in descending order were 24 degree C at 40 ppt, 32 degree C at 40 ppt and 28 degree C at 40 ppt. However, the incubation time was longer at 24 degree C (17.5 h) than at 28 degree C (14.5 h) or 32 degree C (11.5 h).