Animal husbandry is the science of rearing, feeding and caring, breeding and disease control of animals. It ensures supply of proper nutrition to our growing population through activities like increased production and improvement of animal products like milk, eggs, meat, honey, etc.
b. Polyculture of fishes is of great importance.

Explanation

(b) Composite fish farming :
Few selected fishes belonging to different species are stocked together in proper proportion in pond this mixed farming is termed composite fish farming or polyculture. The advantages include,
1. All available niches are fully utilized.
2. Compatible species do not harm each other.
3. No competition among different species is fond.
4. Catla catla, labeo rohita and Cirrhinus mrigala (surface feeder) are the commonly used fish species for composite fish farming.