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| Concentration and Proportion of Calcium and Magnesium in Water in Golden Shrimp Neocaridina sp Culture |
| SONG Bo,CAO Shanmao,SUN Kai |
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Abstract Influences of concentration and proportion of calcium and magnesium in water on growth and vi‐tality of golden shrimp (Neocaridinasp) at water temperature of 20-23 ℃ and pH 6 .5—7 .5 .The golden shrimp was reared in 20 cm × 15 cm × 20 cm glass cylinder at 20 shrimp per cylinder in the water containing total amount of calcium and magnesium at 35 mg/L ,70mg/L or 105 mg/L ,with ratio of calcium to mag‐nesium=1∶1 ,1∶2 ,1∶3 and 1∶4 for 20 days .The activities of alkaline phosphatase (AKP) ,alanine aminotransferase (GTP) ,aspartate aminotransferase (GOT) and Na+ /K+‐ATP (ATPase) enzyme were measured at the end of the experiment .The results showed that the maximal survival rate was observed in the water containing total amount of calcium and magnesium at 105 mg/L ,and the shrimp in the water containing total amount of calcium and magnesium at 70 mg/L had significantly higher grow th rate in body length than the shrimp in the water containing total amount of calcium and magnesium at 35 mg/L (P<0 .05) .There was significantly higher survival rate in the ratio of calcium to magnesium =1∶3 group than that in the ratio of calcium to magnesium = 1∶1 and 1∶4 groups (P<0 .05) .The findings indicate that significant increase in viability and survival is found in golden shrimp cultured in the water with total a‐mount of calcium and magnesium at 105 mg/L ,and ratio of calcium to magnesium=1∶3 .
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Received: 25 June 2015
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