Oyster usually spawn in the pH of:

Correct option is A

Correct Answer: (a) 7.8–8.2
Explanation:
→ Oysters typically spawn in near-natural seawater pH (slightly alkaline) around 7.8–8.2, which supports gamete viability and larval development.
→ Extreme pH deviations impair fertilization and early larval survival.
Information Booster:
→ Maintaining stable pH (~8.0) in hatcheries is critical; acidification (lower pH) is a concern for mollusc aquaculture.
Additional Information (Other Options):
(b) Very alkaline and harmful; (c) overlaps but 7.8–8.2 is more precise; (d) acidic and unsuitable.