The pH of brackish water fish ponds for growing milkfish is:

Correct option is B

Correct Answer: (b) 7.5–9
Explanation:
→ Milkfish (Chanos chanos) grow well in slightly alkaline conditions; pH 7.5–9 is commonly cited as suitable for pond rearing in brackish systems.
→ Alkalinity and buffering capacity help stabilize pH swings.
Information Booster:
→ Sudden pH shifts (particularly toward acidity) stress fish and reduce survival — monitor and correct with liming if needed.
Additional Information (Other Options):
(a),(c),(d): narrower or lower ranges; 7.5–9 gives optimal metabolic conditions for milkfish.