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Gilles Lemari Jean Franois Baroiller Frdric Clota Jrme Lazard Antoine Dosdat 《Aquaculture (Amsterdam, Netherlands)》2004,240(1-4):575-587
In order to develop a simple and accurate index of the salinity resistance of tilapia, batches of 10 juveniles (5 to 20 g) of two different species Oreochromis niloticus and Sarotherodon melanotheron reared in freshwater were subjected to gradual increases in salinity until 100% mortality. Seven daily increments of salinity were tested with 4 replicates: 2, 4, 6, 8, 10, 12 and 14 g l−1 day−1, while control batches were kept in fresh water. The temperature was maintained at 27 °C. The concentration of oxygen, ammonia and the pH were not limiting factors. The mortality, monitored on a daily basis, appeared after 2–51 days and was spread out over 1–20 days, depending on the increment of salinity. The higher the daily rate in salinity increase, then the shorter the time lapse before total mortality occurred. The cumulative mortality as a function of salinity fit well with simple linear regressions. The criterion of the resistance to salinity was the index MLS (median lethal salinity) defined at each daily rate as the salinity at which 50% of fish died. For S. melanotheron, the mean MLS was 123.7±3.5 g l−1 whatever the daily rate in salinity. For O. niloticus, the MLS was 46.3±3.4 g l−1 for daily increases in salinity ranging from 2 to 8 g l−1 day−1 and decreased significantly (P<0.05) above this level. The MLS-8 g l−1 day−1 ,which takes into account the full capacity of the fish to adapt to the increasing salinity, appeared to be a simple, optimized and efficient criterion for assessing the resistance to salinity for O. niloticus and S. melanotheron. This criterion can be a useful tool for ranking the different parental strains and hybrids of different genus and species of tilapia used in programmes of genetic selection for growth and salinity tolerance. 相似文献
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Goikoetxea Alexander Servili Arianna Houdelet Camille Mouchel Olivier Hermet Sophie Clota Fréderic Aerts Johan Fernandino Juan Ignacio Allal François Vandeputte Marc Blondeau-Bidet Eva Geffroy Benjamin 《Fish physiology and biochemistry》2022,48(4):1117-1135
Fish Physiology and Biochemistry - In this study, we aimed to investigate the relationship between cortisol and the determination of sexual fate in the commercially important European sea bass... 相似文献
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