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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...
Immunoglobulin M (IgM) in teleost fishes is the only component of the specific humoral defense system that is affected by environmental factors. In the present study, we examined the effect of various environmental factors (water temperature, salinity, pH and suspended solids) on the plasma IgM in the Nile tilapia, Oreochromis niloticus. For all treatments, fish were acclimatized in particular environmental...
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