Roles of Salinity on Survival Rate, Metamorphosis Period, and Rate of Acclimatization of Dwarf Blue Shrimp, Caridina c.f. babaulti (Bouvier, 1918)
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Abstract
The Dwarf blue shrimp, Caridina c.f. babaulti (Bouvier, 1918), is a very popular species in the ornamental aquarium business worldwide. Recently, a native species resembling the exotic blue shrimp has been introduced. This native shrimp species has been heavily exploited in the wild, leading to attempts to promote captive culturing strategies. Our preliminary experiments suggested that the early life stage of the shrimp is related to salinity. In Experiment I, we aimed to determine the optimum salinity for nursing newly hatched larvae. Three salinity levels (15, 20, and 25 ppt) were tested, with 150 larvae exposed until they reached the juvenile stage, which took 60.33±5.03, 49.33±3.05, and 45.00±1.73 days, respectively. It was found that 20 ppt was the most suitable for this experiment (p<0.05). Experiment II aimed to determine the optimum rate for decreasing salinity for nursing larvae. In this experiment, salinity was maintained at 20 ppt and then sharply decreased by 2, 5, or 10 ppt per day. It was found that decreasing the salinity by 2 ppt per day resulted in a higher survival rate of the shrimp compared to the other treatments (p<0.05). These experiments suggest that it is possible to enhance the nursing success of the shrimp by adjusting salinity levels. It was concluded that the dwarf blue shrimp could be successfully cultivated in captivity.
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