Malachite green(MG) is a carcinogenic, teratogenic, and mutagenic chemical that is often illegally used in fishery production. The chemical residues mainly exist in two forms, as MG and its metabolite leucomalachite green(LMG), both of which have severe carcinogenicity, in aquatic products and the environment. Due to the significant structural differences of these two compounds, existing monoclonal antibodies are only able to detect one drug residue in a sample, and cannot accurately reflect the total amoun...