Influences of rock salt salinity on culture of nile tilapia (Jitlada 3)
2000
Wirat Jiwyam
Growth, survival rate, feed conversion ratio and carcass compositions of Jitlada 3, Nile tilapia reared under different rock salt salinity levels were investigated in laboratory experiment. The results of growth performance indicated the effects of rock salt salinity levels on mean weight gain, relative weight gain and specific growth rate of experimental fishes (p0.01). Consequently, growth of experimental fishes tended to reduce as salinity was beyond 10ppt. Besides this, salinity levels showed the effect on feed conversion ratio of experimental fishes (P0.01). The lowest feed conversion ratio of experimental fishes occurred at salinity of about 5ppt. Carcass analysis showed that crude protein and fat compositions of experimental fishes from different saline conditions were significantly different (P0.01). Crude protein content in carcass of fishes reared under freshwater condition was highest, 53.1+-0.87 percent. Differently, fat content was highest in fishes reared under 10 ppt salinity level, 19.5+-0.75 percent. However, the result of this study did not show the effect of salinity level on ash content of experimental fish carcasses (P0.05).
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