Discuss the technique of hypophysation in details.

Hypophysation is a technique used in freshwater aquaculture to induce artificial breeding in fish, particularly in species that do not spawn naturally under controlled or pond conditions. It involves the administration of pituitary gland extracts or synthetic hormones to stimulate gonadal maturation and spawning. This technique is widely employed for breeding economically important fish species such as carps, catfish, and tilapia.

The process of hypophysation can be broken down into the following stages:

1. Selection of Brooders  
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