Acute Toxicity of Hydrated Lime (Calcium hydroxide) to Clarias gariepinus Fingerlings


Acute toxicity
Calcium hydroxide
Clarias gariepinus


The acute toxicity of hydrated lime to fish is a critical concern in aquatic environments, as it can neutralize acidic gases, potentially reducing the toxicity of gaseous products. Understanding its acute toxicity levels is essential for assessing the immediate adverse effects of substances on organisms, including fish. This study aimed to determine the 96-hour LC50 acute toxicity of hydrated lime (calcium hydroxide) on fingerlings of the African catfish Clarias gariepinus. The acute toxicity of calcium hydroxide (hydrated lime) on the fingerlings of C. gariepinus (mean weight and length 5.8±0.2g and 4.2 ± 0.3cm, respectively) was investigated under laboratory conditions in a static bioassay. Fish were exposed for 96 hours to various concentrations of 280 mg/L, 272 mg/L, 264 mg/L, 256 mg/L, 248 mg/L, and 0.0 mg/L, each treatment having a replicate aeration system. The mortality of C. gariepinus fingerlings exposed to different concentrations of calcium hydroxide was found to be directly proportional to an increase in the concentration of the substance. The 96-hour LC50 was 268 mg/L, with upper and lower limits of 272.375 mg/l and 263.695 mg/L, respectively. This indicates that as the concentration of calcium hydroxide increased, so did the mortality rate of the fish, with no mortality observed in the control group. The presence of calcium hydroxide in water can pose a threat to fish species and other aquatic organisms due to its toxic properties.



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