Effects of different salinity levels on growth, survival and trypsin actitvity of early juvenile Marble goby, Oxyeleotris marmoratus
2009
Sitti Raehanah Muhd Shaleh | Muhammad Darwis | Masaru Tanaka | Shigeharu Senoo
Marble goby, Oxyeleotris marmoratus is the expensive freshwaterfish of family Eleotridae. Many farmers in Southeast Asian regions are trying to culture this fish. The mass seed production technique has not yet been established due to the high mortality occurring in the early juvenile stage. In the present study,juveniles of 40 days after hatching (d AH) were reared at different salinity levels(SaLs) for 60 days in order to determine the growth, survival, body protein content and trypsin activity. Throughout the experiment, the optimum Sal recorded was 10 ppt. The mean specific growth rate (6.6%) and survival rate (85.6%) were significantly higher (P<0.05) in 10 ppt Sal as compared with 0 and 30 ppt SaLs. Protein content and specific trypsin activity were also significantly higher (P<0.05) at 10 ppt SaL in which varied from 0.23 to 0.43 mg/ml and 0.001 to 0.066 mUnits/mg protein/min, respectively. Specific trypsin activity increased from 50 to 70 d AH but decreased from 80 to 100 d AH. The highest growth and survival rates of juveniles in 1Oppt SaL was considered to be caused by the higher trypsin activity.
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