Abstract:The salinity tolerance of Pseudosciaena crocea during early development (newlyhatched larvae, mouthopened larvae, yolksac disappeared larvae, oil globules disappeared larvae, fry and 30dayold juvenile) was examined at salinites of 5, 10, 25, 40 and 45. The mortality, mean death time (MDT), median death time (DT50), and median lethal salinity72 h (MLS-72) were employed as indicators of salinity tolerance. The results showed that suitable salinity for 30dayold juvenile, yolksac disappeared larvae, mouthopened larvae, fry, and newlyhatched larvae ranged from 5.5 to 41.0, 6.8 to 23.3, 8.2 to 39.4, 9.3to 26.7, 18.9 to 33.1, respectively. Therefore, the salinity tolerance of 30dayold juvenile of P.crocea is rather strong, especially it can tolerate lowsalinity of 5.5. The results lay a theoretical foundation for desalting culture and the fresh water treatment for white spot disease of P.crocea . In normal seawater, the median death time (the pointofnoreturn, PNR) at different developmental stages without feeding was determined as follows: newlyhatched larvae (8.6 d) > mouthopened larvae (6.5 d) > 30dayold juvenile (5.5 d) > yolksac disappeared larvae (4.6 d) > fry (4.0 d) > oil globules disappeared larvae (1.8 d). These indicate that the feeding of exogenous nutrients should be enhanced before the oil globules disappeared, was it will help to improve lowsalinity tolerance and survival of P.crocea ’s larvae.