Harvesting procedure of brackishwater fish and prawn is different from that of freshwater fishes. Partial draining of fish pond is to be done before netting. Netting and trapping are only partially effective in removing the stocked fishes and prawns. For total harvest, draining or pumping out of all pond water is essential. After complete drainage, hand picking has to be done mainly to recover the burried prawns.
Economics of brackish water aquaculture will vary from place to place depending on land price, cost of labour and farm construction materials and transportation of the stackable materials to the working site, since many of the suitable sites are located in desolate areas without proper communication facilities. General economics of brackishwater shrimp culture of a farm having 12.5 ha (water area 10.0 ha) is given in Table-5, Investment and return functions have been calculated on the basis of land price and cost of other construction materials prevalent in the state of West Bengal.
Brackishwater fish farming involves high capital investment and maintenance of these farms pose many problems. Area development, communication and infrastructure developments entail heavy capital expenditure. Unfavourable tidal amplitude, high rate of siltation, cyclone, pollution, soil acidity, etc. are some of the factors that deserve special consideration.
- Central Inland Fisheries Research Institute, Barrackpore