Question

Nursery phase of major carps refer to rearing of 4 day old spawn (5-6 mm) in ponds for a period of

• A. 20-30 days
• B. 30-45 days
• C. 8-12 days
• D. 15-20 days

Hint:

Remember the stages and sizes of carp seed:
- Spawn (5--6 mm) \(\rightarrow\) Fry (20--25 mm) in 15--20 days (Nursery Phase).
- Fry \(\rightarrow\) Fingerlings (100--150 mm) in 60--90 days (Rearing Phase).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The culture of Indian Major Carps involves distinct, sequential rearing phases: nursery phase, rearing phase, and grow-out phase.

Step 2: Detailed Explanation:
- Nursery phase: Rearing of 4-day-old, newly hatched spawn (length \(5\text{--}6\text{ mm}\)) to the fry stage (length \(20\text{--}25\text{ mm}\)).
This phase is carried out in highly fertilized nursery ponds for a short period of \(15\text{--}20\text{ days}\).
- Rearing phase: Rearing of fry to fingerlings (\(100\text{--}150\text{ mm}\)) over a period of \(2\text{--}3\) months.

Step 3: Final Answer:
The nursery phase duration is 15-20 days, corresponding to option (D).