S. ADHİKARİ, V. S. CHAURASİA, Ajaz Ahmad NAQVİ, B. R. PİLLAİ

Survival and growth of Macrobrachium rosenbergii (de Man) Juvenile in relation to calcium hardness and bicarbonate alkalinity

Survival and growth of Macrobrachium rosenbergii juvenile (0.045g±0.007, 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±0.03g, 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. 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.

Anahtar Kelimeler:

kabuklu su ürünleri, kalsiyum, büyüme, sertlik, yaşayabilme, alkalilik, Macrobrachium rosenbergii, iri karides

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