Question

7) State d process of induced breeding briefly

Answer 1

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Answer 2

The fish production from inland water which are essentially culture fisheries and are less capital intensive have growth rate at present when compared to marine fisheries which are essentially capture and are capital intensive have relatively slow growth rate. Also increased population has resulted in shortage of foodstuff from land resources and even from the capture fisheries. Fish thus can be supplied with fewer man-hours and lesser capital investment. Thus, an emphasis has been given to culture fisheries - AQUACULTURE.

The major problem in cultivating the major carps and Chinese carps is the non-availability of seeds for ready stocking in fish ponds. Because, they do not breed in confined waters even though they mature in these water bodies. They breed in flooded rivers during monsoon when temperature is low. Though riverine seed fish resources meats nearly 90 % of the demand, but they are mixed and found not suitable for profitable fish culture. Further, the seed fish may not be available at the time of requirements and seeds are available only at some selected collection centres which are often not easily accessible and their transportation from place of collection to the culture site may also pose mortality problems. In order to overcome these problems, the induced breeding by “HYPOPHYSATION TECHNIQUE " has been development. Usually pituitary glands are used to induce the fish for spawn. The hormone secreted by pituitary gland stimulates growth, development, maturity and ovulation of eggs. These hormone secreted from pituitary are protein or peptide.


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