Hypophysation is done in fishes to

Options

A. increase size
B. increase their growth
C. cause breeding in fisheries
D. increase their palatability

Answer

**Step-by-Step Solution:**

1. **Understanding Hypophysiation**:
- Hypophysiation is a technique used in aquaculture (fish farming) that involves the use of hormones to induce breeding in fish.

2. **Purpose of Hypophysiation**:
- The primary purpose of hypophysiation is to stimulate the reproductive process in fish. This is particularly important in controlled breeding environments where natural breeding may not occur.

3. **Mechanism of Action**:
- In hypophysiation, extracts from the pituitary gland of a fish (or sometimes from other species) are injected into the fish. These extracts contain gonadotropin hormones that play a crucial role in regulating reproduction.

4. **Inducing Breeding**:
- The hormones released from the pituitary gland stimulate the fish's reproductive organs, leading to the maturation of eggs in females and sperm in males, thus inducing breeding.

5. **Benefits of Hypophysiation**:
- By using this method, fish farmers can increase the number of offspring, which is essential for maintaining fish populations and ensuring a sustainable supply for consumption and trade.

6. **Conclusion**:
- Therefore, hypophysiation is primarily done in fishes to induce breeding and increase their population, which is vital for aquaculture practices.