From Local and International studies, we can say Fish farming is divided into three category, known as extensive fish farming,semi-intensive fish farming and intensive fish farming.
EXTENSIVE SYSTEM: This involves cultivation of fish in earthen ponds, cages or pens, whereby no additional feed is given to the fish. They are left to depend on the natural productivity of the water for survival. Stocking density in this system is lowest, about 3fish/m^2 or less. Usually no artificial fertilizer or lime is applied to the pond. The advatage of this system is that it cost very little or nothing
to run the pond. But fish yield may be as low as 1-3 tons per hectare.
SEMI-INTTENSIVE FISH CULTRE SYSTEM: This system is mostly done in earthen ponds and sometimes using tanks. The fish are given artificial feed occasionally; ponds may be limed and fertilized. Stocking desity is average. fish yield may not be up to 10 tons per hectare. This system is popular in integrated Agro-fish culture system.
INTENSIVE FISH CULTURE: It is practiced in ponds, cages, pens and mostly tanks in flow through and re-circulatory water system. Fish are fed high quality feed to satiation up to 6 times daily. Water quality is regularly monitored and maintained at optimum. Dissolved oxygen content of the system is enhanced through regular aeration. Stocking density is usually very high, and the fish yield in highest in this system.
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