大黄鱼早期发育阶段对盐度的适应性
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上海市科学技术委员会重点项目(10JC1406200,11320501200);上海市教育委员会重点创新项目(10ZZ102);国家自然科学基金(31072228)


Salinity tolerance of Pseudosciaena crocea during early development
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    摘要:

    在5、10、25、40及45这5种盐度梯度下,对大黄鱼初孵仔鱼、开口仔鱼、卵黄囊消失仔鱼、油球消失仔鱼、稚鱼和30日龄幼鱼的耐盐性进行了比较研究,对不同发育时期的死亡率、半数死亡时间、平均死亡时间及72 h半致死盐度等耐盐指标进行了分析。实验结果显示,大黄鱼早期各发育阶段对盐度的适应范围为:30日龄幼鱼为5.5~41.0,卵黄囊消失仔鱼为6.8~23.3,开口仔鱼为8.2~39.4,稚鱼为9.3~26.7,初孵仔鱼为18.9~33.1。表明30日龄幼鱼具有较强的耐盐性,尤其能在较低盐度(5.5)的环境中生活,为大黄鱼的淡化养殖及白点病的淡水浴治疗提供了依据。在正常海水盐度和不投饵状态下,各发育阶段的半数死亡时间,即饥饿不可逆点为:初孵仔鱼(8.6 d)>开口仔鱼(6.5 d)>30日龄幼鱼(5.5 d)>卵黄囊消失仔鱼(4.6 d)>稚鱼(4.0 d)>油球消失仔鱼(1.8 d)。此结果说明在仔鱼开口后应加强外源性营养的投喂,将有助于提高幼体对低盐度的耐受性及其成活率。

    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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  • 在线发布日期: 2012-03-16
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