Answer:
Some kinds of intervention by man in the course of natural propagation of cultivated or cultivable fishes may help to achieve a better survival of their offspring. The techniques of artificial propagation of fish are manifold, all of which are aimed at producing plenty of spawn, fry, and fingerlings for utilization in culture or for restocking water bodies or water courses. The demand for quality fish seeds is particularly great for modern intensive and superintensive culture systems. The polyculture system has further increased the demand for the seed of fishes of different feeding habits.
