Indian Journal of Science and Technology

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Nitrogen fertilizers tend to increase ammonium concentration especially in the aquatic medium. To evaluate its impact, the acute toxicity of ammonium sulphate, urea and a composite fertilizer (15:15:15) (NPK-1) was assessed in fingerlings of fresh water fish Catla catla using a static test system. The toxicity of ammonium sulphate, urea and NPK1 to C. catla increased with increasing fertilizer concentration and duration of exposure. The concentration that killed 10% (LC10) and 90% (LC90) of fish varied with the fertilizers. The concentrations of ammonium sulphate, urea and NPK- 1 that killed 50% of fingerlings of C. catla within 96-h (96-h LC50) were 0.12, 0.19 and 0.18 g/L, respectively. Ammonium sulphate concentrations killing 50% (LC50) of the fingerlings of fresh water fish Catla catlawere 0.23, 0.17, and 0.14, 0.12 g/L during 24hr, 48hr, 72hr and 96hr correspondingly. Ammonium sulphate was found to be more toxic to the juvenile fresh water fish C. catla compared to urea and NPK-1.

Keywords

Acute Toxicity, Nitrogen Fertilizers, Catla catla, Fish, Pollution
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