The colour of mature egg of Scylla serrata is:

Correct option is A

Correct Answer: (a) Brownish
Explanation:
→ Mature egg masses of the mud crab Scylla serrata are typically brownish to dark brown, due to yolk pigmentation and embryonic development stages.
→ Colour may darken as embryos develop and chromatophores form.
Information Booster:
→ Egg colour can indicate developmental stage and broodstock condition; hatchery managers monitor colour to time hatching and larval rearing.
Additional Information (Other Options):
(b–d): Not typical for mature S. serrata egg appearance.