Question

In the breeding of Indian major carps on a large scale, which of the following is more commonly used?

• A. Glass jar hatchery
• B. Vertical hatchery
• C. Circular hatchery
• D. Hapa method

Hint:

"Circular Hatchery" = "Chinese Hatchery" = "Eco-hatchery." It is the backbone of the Indian fish seed industry due to its high capacity and efficiency.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Large-scale seed production requires high efficiency, minimal labor, and high survival rates of eggs and hatchlings. Different hatchery models have been developed over the years.
Detailed Explanation:
1. Hapa Method: The oldest method, involving cloth enclosures in ponds. It is prone to environmental fluctuations and predation; not suitable for large-scale modern commercial production.
2. Glass Jar Hatchery: Uses vertical flow in glass jars. Good for research or small batches, but difficult to scale up to millions of eggs.
3. Circular Hatchery (Chinese Eco-hatchery): This is the most common system used in India for large-scale production. It consists of a circular spawning pool and a circular incubation/hatching pool. Water enters tangentially, creating a continuous circular current that mimics the riverine environment. This keeps the semi-buoyant eggs of IMC in constant motion, ensuring uniform oxygenation and preventing them from clumping or settling. It can handle millions of eggs simultaneously with very high survival rates.

Step 2: Final Answer:
The Circular (Chinese) hatchery is the most common and efficient method for large-scale IMC breeding.