Acute toxicity of inorganic fertilizers to African catfish,Clarias gariepinus(Teugals)

摘要

Abstract.Acute toxicity of Ca(OH)2, NPK, Na3PO412H2O and NaNO3fertilizers onClarias gariepinus(Teugals) was investigated in glass aquaria. Results showed that Ca(OH)3 was the most toxic of the four fertilizers. Na3PO4.12H2O and NaNO3 were less toxic. The 96‐h LC50 for the fertilizers ranged from 33.9 mg/l for Ca(OH)2 to 1258.9 mg/1 for NaNO3. It is concluded that secondary application of these fertilizers in stocked ponds should be avoide