Salinity tolerance of Pseudosciaena crocea during early development
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    Abstract:

    The salinity tolerance of Pseudosciaena crocea during early development (newlyhatched larvae, mouthopened larvae, yolksac disappeared larvae, oil globules disappeared larvae, fry and 30dayold 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 salinity72 h (MLS-72) were employed as indicators of salinity tolerance. The results showed that suitable salinity for 30dayold juvenile, yolksac disappeared larvae, mouthopened larvae, fry, and newlyhatched larvae ranged from 5.5 to 41.0, 6.8 to 23.3, 8.2 to 39.4, 9.3to 26.7, 18.9 to 33.1, respectively. Therefore, the salinity tolerance of 30dayold juvenile of P.crocea is rather strong, especially it can tolerate lowsalinity 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 pointofnoreturn, PNR) at different developmental stages without feeding was determined as follows: newlyhatched larvae (8.6 d) > mouthopened larvae (6.5 d) > 30dayold juvenile (5.5 d) > yolksac 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 lowsalinity tolerance and survival of P.crocea ’s larvae.

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李 兵,钟英斌,吕为群.大黄鱼早期发育阶段对盐度的适应性[J].上海海洋大学学报,2012,21(2):204-211.
LI Bing, ZHONG Ying-bin, LV Wei-qun. Salinity tolerance of Pseudosciaena crocea during early development[J]. Journal of Shanghai Ocean University,2012,21(2):204-211.

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  • Online: March 16,2012
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