State two advantages of composite fish culture. What is the application of hormonal stimulation in fish culture?

(N/A) Advantages of composite fish culture:
$(i)$ It allows for the cultivation of a variety of fish species in a single pond,leading to higher yields.
$(ii)$ Different species utilize food from different zones of the pond,ensuring efficient use of available resources.
$(iii)$ Since species are selected based on different feeding habits,they do not compete for the same food source.
Application of hormonal stimulation:
Hormonal stimulation is used in fish culture to ensure the supply of pure fish seed in desired quantities by inducing breeding in fish that might not otherwise breed in captivity.