[Objective] To explore the test condition and method sensitivity of Cholinestersae( ChE) and β-N-Acetyl-D-glucosaminidase( NAGase) from Daphnia magna by the methods of competitive and non-competitive ELISA.[Method]ChE and NAGase of Daphnia magna were detected by the methods of indirect competitive and non-competitive ELISA,respectively.[Result]As for ChE,the optimal dilutions for the antigen and the antibody were 1. 466 μg / m L and 1∶ 10 000,respectively,and the sensitivity was measured to be 7. 426 7 ng /...