Effects of different salinity and temperatures on the growth, survival, haematocrit and blood biochemistry of Goldfish (Carassius auratus).

摘要

The aim of the present study was to investigate the effects of different salinities (0 per mil, 6 per mil and 12 per mil) and temperatures (23, 27 and 31 degrees C) on the food consumption, growth, blood biochemistry and haematocrit of Goldfish. After 45 days of exposure to different salinities and temperatures, Goldfish showed a good adaptation to these salinities and temperatures in terms of blood biochemistry (glucose and triglyceride) and haematocrit. Salinities (0 per mil and 6 per mil) and temperatures (23 and 27 degrees C) did not affect the weight gain, specific growth rate, final biomass and feed conversion rates, but these parameters were significant (P<0.05) at 12 per mil salinity and 31 degrees C temperature. Plasma total protein levels decreased with the increase in salinity (P<0.05), while they were independent of temperature. In conclusion, Carassius auratus, a freshwater stenohaline fish, showed good growth in saline waters with maximum 12 per mil salinity and 31 degrees C temperature.