3. Improvement In Food Resources
Poultry Diseases :
The poultry birds suffer from various diseases caused by virus (Fowl pox, Ranikhet), bacteria (Tuberculosis, Cholera, Diarrhoea), fungi (Aspergillosis), parasite (worms, mites, lice), etc.
Fish Production :
Capture fishing i.e., obtaining fishes from natural resources.
Culture fishery i.e., fish farming.
The fishes which are obtained from island water bodies such as ponds, lakes, rivers and streams are called fresh water fishes Ex- labeo, while those obtained from sea are called marine fish Ex - Harpodon (Bombay duck), Mackerel, bhetki, pomfret, Tuna, sardine.
Composite Fish Farming :
The intensive fish farming can be done in composite fish culture systems.
In such a system, a combination of five or six fish species are grown in a single fish pond.
For example catla are surface feeders, Rohu feed in the middle zone of the pond, and common carps are bottom feeders and Grass carps feed on the weeds. Such farming increases the fish yield.