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www.iaritoppers.in Whatsapp : +91-9694095242 Page | 1 Composite Fish Culture  Fish is the cheapest and most easily digestible animal protein.  Any perennial freshwater pond/tank retaining water depth of 2 meters can be used for fish culture purpose. However, the minimum level should not fall below one meter.  Even seasonal ponds can also be utilized for short duration fish culture.  The average productivity from ponds at present is to the tune of 2500 kg/ha/year. Species Feeding habit Feeding Zone Indian Major Carp Catla Zoo plankton feeder Surface feeder Rohu Omnivorous Column feeder Mrigal Detrivorous Bottom Feeder Exotic carps Silver carp Phytoplankton feeder Surface feeder Grass carp Herbivorous Surface, column and marginal areas Common Carp Detrivorous/Omnivorous Bottom feeder  Repayment: 8 years with 1-year moratorium Technical Parameters : Pond Management:  Pre-stocking: In case of new ponds, pre stocking operations starts with liming and filling of the pond with water. However, the first step for existing pond requiring development deals with clearing the pond of unwanted weeds and fishes either by manual, mechanical or chemical means. Current Affairs Part-20 NABARD Norms Part-1
www.iaritoppers.in Whatsapp : +91-9694095242 Page | 2 Different methods are employed for this –  Removal of weeds by Manual/Mechanical or through Chemical means.  Removal of unwanted and predatory fishes and other animals by repeated netting or using mahua oil cake @ 2500 kg/ha meter or by sun drying the pond bed.  Liming: The soils/ tanks which are acidic in nature are less productive than alkaline ponds. The normal doses of the lime desired ranges from 200 to 250 Kg/ha. However, the actual dose has to be calculated based on pH of the soil and water as follows: Soil pH Lime (kg/ha) 4.5-5.0 2,000 5.1-6.5 1,000 6.6-7.5 500 7.6-8.5 200 8.6-9.5 Nil Fertilization / Manuring: Organic Organic manure to be applied after a gap of 3 days from the date of liming. Cow dung @ 5000 kg/ha or any other organic manure inequivalent manurial value. Inorganic Inorganic fertilization to be undertaken after 15 days of organic manuring. Stocking:  The pond will be ready for stocking after 15 days of application of fertilizers. Fish fingerlings of 50- 100 gm size (approx) should be used for stocking @ 3000 nos. per acre.  The present model envisages stocking of advanced fingerlings and rearing for 10-12 months.  Multiple stocking & multiple harvesting technique is being increasingly used by farmers across all states. The technology involves stocking of seeds at a higher rate than the normal recommended norm. As against the normal stocking density of 5000 seeds per ha (fingerlings of size: 8 cm), a stocking density in the range of 7500-10,000 per ha seeds is practised in this technology.