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How to Grow Scampi (Giant Prawn) in Cotton Districts

A hands-on guide for farmers in cotton-growing regions who want to add giant freshwater prawn (scampi) to their enterprises. Covers site selection, pond construction, seed, culture methods and harvesting.

Ranjeet Natarajan
Ranjeet Natarajan August 9, 2026 6 min read 1,161 words
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How to Grow Scampi (Giant Prawn) in Cotton Districts

Why scampi suit cotton districts

Many cotton districts have features that make them suitable for scampi (giant freshwater prawn, Macrobrachium spp.) culture: flat land, monsoon-fed surface water, clay soils that retain water, and farmers who understand water-management. Scampi can be grown in existing farm ponds, retired cotton fields converted to culture ponds, or in purpose-built earthen ponds. The enterprise can provide cash flow in months when fields are fallow and diversify farm income.

Basic biology and culture window

Commercial scampi farming in inland areas uses the giant freshwater prawn (commonly Macrobrachium rosenbergii). Grow-out is typically a single crop that takes several months to reach market size, depending on stocking density, feeding and water quality. Match the grow-out cycle to local climate: temperate winters slow growth, while warm, well-managed ponds grow prawns faster.

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Site selection and water sources

  • Water availability: Reliable fresh water is critical. Sources include farm ponds, dug wells, canals or treated bore water. Avoid saline or brackish water unless using brackish-tolerant species or hybrids.
  • Soil type: Heavy clay or clay-loam is ideal because it holds water and reduces seepage. Sandy soils require lining or more frequent water fills.
  • Topography: Flat or gently sloping land is easiest for pond construction and water control.
  • Biosecurity: Locate ponds away from sewage discharge and areas with uncontrolled livestock access. Reduce risk of contamination by fencing and controlling access.

Pond design and construction

Use earthen ponds with well-formed bunds and simple inlet/outlet structures so you can control water level and drainage. Key design points:

  • Pond depth: 1–1.5 m is common for earthen scampi ponds. Shallow margins (30–50 cm) provide habitat for juveniles.
  • Surface area: Ponds can range from small (a few hundred m2) to hectares. Small modular ponds are easier to manage and harvest.
  • Inlet/outlet: Provide pipes and sluice gates for controlled water exchange. A drain for complete harvest and cleaning is essential.
  • Lining: If soil permeability is high, use clay compaction or synthetic lining to minimize seepage.
  • Shelter structures: Prawns use vertical space and shelter; provide PVC pipes, bamboo, or brush bundles to reduce aggression and improve survival when stocking densities are moderate to high.

Choosing seed and varieties

Use healthy post-larvae (PL) from reputable hatcheries. Check PL quality on arrival: active swimming, intact appendages, and no visible fungal mats or discoloration. If possible buy larger-sized PL or juveniles from proven suppliers.

  • Source: Select hatcheries with traceability, disease screening and good survival records.
  • Size at stocking: Depending on the system, you can stock at PL post-larvae (PL10–PL20) or juvenile stage (several grams) if available.
  • Disease: Confirm hatchery disease-free certification where possible and quarantine new batches if practical.

Stocking density and culture systems

Choose a culture system that matches your management capacity.

  • Extensive/traditional: Low inputs, low densities. Good for minimal investment but slower growth and lower yields.
  • Semi-intensive: Moderate stocking, regular feeding and water management. This is a practical choice for farm diversification in cotton districts.
  • Intensive: High stocking, high feed and aeration needs—requires more capital and strong management.

Stocking density guidance (general): for semi-intensive earthen ponds consider moderate densities; do not overcrowd without aeration and high-quality feed. Use shelter structures to reduce cannibalism.

Feeding and nutrition

Good feed management is the most important operational cost and determinant of growth. Use commercially formulated prawn feed where available; otherwise, balance protein (around 30–40% for grow-out) and energy sources. Feed according to size and expected daily feed percentage of biomass, adjusted as prawns grow and as water temperature changes.

  • Feed multiple times per day rather than one large meal to reduce waste.
  • Remove uneaten feed and feces during drain/harvest operations to keep water quality stable.
  • Consider supplemental natural foods: manage pond fertility (phytoplankton, zooplankton) with controlled fertilization to provide natural supplements and reduce feed cost.

Water quality and pond management

Monitor and manage water quality regularly. Key parameters to watch:

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  • Temperature: Affects metabolism and feeding. Adjust feeding with seasonal changes.
  • Dissolved oxygen (DO): Keep DO above stressful levels—especially important at night. Aeration helps with higher densities.
  • pH: Neutral to slightly alkaline is preferable; sudden swings stress prawns.
  • Ammonia and nitrite: Keep low by avoiding overfeeding and maintaining good pond exchange and natural biofilters.

Manage pond bottom condition by periodic drying and tilling of the pond bed between crops. Controlled fertilization (organic or inorganic) can promote natural food, but avoid over-fertilization that causes oxygen crashes.

Disease prevention and biosecurity

  • Quarantine new seed stock and observe for at least a week if possible.
  • Control pond access, disinfect equipment, and avoid mixing water between ponds without treatment.
  • Reduce stress: stable water quality, adequate shelter, and suitable stocking densities lower disease outbreaks.
  • Have a local laboratory or extension contact for diagnosis if mortality occurs—don’t guess at treatments.

Harvesting and post-harvest handling

Drain ponds or use seine nets for harvest, depending on pond infrastructure. Timing depends on market size and price. Handle prawns gently—minimize time out of water, chill or place in oxygenated tanks if transport requires it. Grade by size if selling to processors or live markets; good sizing improves price.

Integration with cotton farming and crop rotations

Scampi culture can fit into cotton district rotations in several ways:

  • Convert fallow or low-producing plots into seasonal ponds during non-critical crop periods.
  • Use pond water for irrigation after appropriate checks—avoid transferring pathogens to crops and ensure water quality is suitable.
  • Return organic pond sludge as a soil amendment after proper composting; it can be valuable for soil organic matter but should be treated to reduce pathogen risk.

Economics and marketing

Start small to learn the system before scaling. Know your market—fresh live prawns, chilled or processed products fetch different prices and have different handling requirements. Build relationships with buyers, processors, or local markets before you harvest. Record all inputs and yields so you can refine stocking, feeding and harvest timing for profitability.

Common practical tips from growers

  • Start with one or two ponds to master water management and feeding schedules.
  • Keep good records: stocking date, source and survival, feed used, water-quality notes and harvest weights.
  • Use simple shelters (PVC, bamboo) to reduce cannibalism and improve survival in small ponds.
  • Communicate with nearby farmers to coordinate water use in the dry season and avoid contamination of shared sources.

Where to get help

Contact local aquaculture extension services, hatcheries or cooperative societies for region-specific advice, seed sources and disease diagnosis. Practical, local mentorship from farmers already producing prawns is invaluable.

Final checklist before starting

  • Confirm reliable fresh water source and soil suitability.
  • Plan pond design with proper inlet/outlet and drainage for harvest.
  • Identify a reputable seed supplier and market for harvest.
  • Prepare a realistic budget that covers feed, labor, and contingencies.
  • Start small, monitor carefully, and scale up as you gain experience.

Growing scampi in cotton districts is a practical way to diversify farm income using existing water and land resources. With attention to pond construction, seed quality, feeding and water management, farmers can develop a viable prawn enterprise suited to local conditions.

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Ranjeet Natarajan
Ranjeet Natarajan

Contributing writer at Agriculture Novel — telling the stories that sustain us.

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