The higher the D.O. the higher percentage conversion of nauplii, all treatment have average percentage conversion nauplii to Zoea 1 stage it shows significant difference (p < 0.05) and 25 ppm gives the highest percentage conversions at 95.33% followed by 20 ppm, 15 ppm and 10 ppm which have the average percentage conversion of 93.23%, 89.33% ,85.67.%, respectively.