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Abstract
The combined effects of elevated temperature and salinity on physiological parameters, growth and enzymatic activities of striped snakehead (Channa striata) from larvae to juvenile stage were investigated. Larvae were reared at three temperature levels (27oC, 30oC and 33oC) in combination with three salinities (0, 5 and 10‰). The results showed that temperature and salinity did not influence the haematological parameters of fish such as red blood cells, haemoglobin concentration and haematocrit value. The number of white blood cells decreased at treatments 27oC-5‰, 30oC-5‰ and 33oC treatments. Glucose concentration decreased significantly at 5‰ treatment compared to those at 0‰ treatment (p<0,05). The Cl- ion concentration in plasma raised with the increase of temperatures and salinities, while osmolality and Na+ ion concentration were not affected by these two environmental factors. Temperature and salinity did not show their impacts on the amylase, trypsin and pepsin activities, however, the chymotrypsin activities in intestine were reduced at high temperature and salinity. The highest weight was shown at the 27oC-0‰ treatment with the highest survival rate being recorded at the 33oC-0‰ treatment. This study proves that the combination of temperature and salinity potentially influences the striped snakehead at the larvae to juvenile stage.