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Turkish Journal of Fisheries and Aquatic Sciences 2007, Vol 7, Num, 1     (Pages: 23-26)

Survival and Growth of Macrobrachium rosenbergii (de Man) Juvenile in Relation to Calcium Hardness and Bicarbonate Alkalinity

S. Adhikari 1 ,V. S. Chaurasia 1 ,Ajaz Ahmad Naqvi 1 ,B. R. Pillai 1

1 Soil and Water Chemistry Section Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar – 751002, Orissa, India Viewed : 1841 - Downloaded : 2443 Survival and growth of Macrobrachium rosenbergii juvenile (0.045±0.007 g, 25 days old) were investigated under different calcium hardness levels from 92 to 384 mg/L CaCO3 for 42 days. The maximum survival rate (100%) was observed at a calcium hardness level of 92 mg/L CaCO3, while the lowest survival rate (60%) was recorded at the highest calcium hardness level of 384 mg/L CaCO3. Maximum growth of the prawn (11.6±2.7 mg/day) was observed at 132 mg/L CaCO3. However, there were not significant (P>0.05) changes in growth at calcium hardness levels of 92 and 192 mg/L CaCO3. The growth of the prawn declined significantly (P<0.05) at calcium hardness level of 228 mg/L CaCO3 and above. Survival and growth study of M. rosenbergii juvenile (0.12±0.03 g, 60 days old) was also done under different bicarbonate levels from 100 to 370 mg/L CaCO3 for 60 days. Survival rate of the prawn was highly impaired at the highest bicarbonate levels tested while maximum survival rate (90%) was recorded at bicarbonate level of 100 mg/L CaCO3. The highest growth (4.92±0.13 mg/day) of the prawn was recorded at lowest bicarbonate level of 100 mg/L CaCO3 tested and the growth significantly (P<0.05) declined at 205 mg/L CaCO3 bicarbonate alkalinity and above. Keywords : survival rate, growth, Macrobrachium rosenbergii, hardness, alkalinity