Ovarian stage   Macroscopic description
  I – Immature/recovering (previtellogenic stage)   Ovaries are thin strand-like and translucent to opaque white; recovering spent ovaries in few crabs.
II – Developing (vitellogenic stage I) Ovaries are thickened and dark yellow; oocytes are arranged compactly and are not clearly visible within the ovary.
III – Mature (vitellogenic stage II) Ovaries further thickened and orange in colour; oocytes are clearly visible in the ovary.
IV – Ripe (vitellogenic stage III) Ovaries swollen and large; dark brown or bright orange; oocytes are clearly visible in the ovary.
V – Spent ovary Ovaries are slightly thick and white in colour; few unspent dark orange or dark brown oocytes are also present in some crabs.  
Table 2: The macroscopic description of the different stages of ovarian development in the crab O. senex sene.