| I | Ovaries are very small size, oocytes cannot to distinguish to the naked eyes |
| II | Ovaries have begun to develop; oocytes are difficultly distinguishable to the naked eyes |
| III | Advanced maturation, oocyte distinguishable to the naked eyes testes changes from transparent pale yellow |
| IV | Ovaries have achieved their development but the sexual products are still not extruded when light pressure is applied |
| V | Ripe ovaries, sexual products are extruded in responses to very light pressure on the belly |
| VI | The oocytes have been discharged, ovaries have appearance of deflated sacs and containing few left over oocytes |