studies on improved practices of prawn farming for higher ...

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7. Water quality management.
8. Post-harvest technology and marketing.
Typically, depending on the density of stocking, grow out
methods are categorised as "traditional" (stocking density unknown)
"extensive" (low stocking density of 1-2/ml with no feeding), "semiintensive"
(medium density ie. 6-10/m’ with feeding), "intensive"
(higher density ie. 20-40/ml with feeding and aeration) and "super
intensive" (with very high density of 200-500/ml feeding, aeration and
high water exchange). With increase in density, the technology becomes
sophisticated, capital costs go up and the production per unit area
increases as the farms get smaller.
In general, increased production of 4600-7400 kg/ha was
achieved by increasing the stocking rates to 40-45/m2 and supplying
high energy feeds while maintaining high oxygen values using pond
aerators.
Shrimp prices are on the increase for the largest sizes (16-20
g) compared to small and medium sizes. Hence the importance of raising
standard sized specimens within short duration is preferred.
a) Traditional, is the simplest culture to undertake with
least inputs during operations. (1) Being the lowest level of
intensity of culture, the production rate also is the lowest. (2) In
this management, the stock is variable with many extraneous species and
(3) Also there is no specific stocking rate. (4) The big ponds used
are uncleared and (5) fossess only make shift dykes. (6) Due to uneven
bottom, the depth of water may vary at different points (7) The crops
mainly depend on the natural fertility of the fields/areas as no
fertilizer is added for the growth of feed organisms. (8) Feeding is
not resorted (9) Similarly neither pumps nor aerators are used (10)
Also use of pesticides are not in vogue (ll) In the presence of
predators there can be no control over the quality or quantity. (12)
The generally variable production does not require any special post