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Growing Scampi (Giant Prawn) in Coimbatore: Practical Guide

A hands-on guide for Coimbatore growers on producing scampi (giant freshwater prawn). Covers variety choice, pond preparation, seed sourcing, culture practices, and troubleshooting.

Ranjeet Natarajan
Ranjeet Natarajan August 9, 2026 5 min read 1,035 words
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Growing Scampi (Giant Prawn) in Coimbatore: Practical Guide

Introduction

Scampi in India generally refers to the giant freshwater prawn, Macrobrachium spp., commonly cultured in ponds and tanks. Coimbatore’s warm climate and access to groundwater and agricultural byproducts make it suitable for scampi farming if you follow practical on-farm steps: choose the right variety, prepare the site, manage water and feed, and keep disease prevention front and center.

Which variety to grow

The most commonly cultured species in India is Macrobrachium rosenbergii. For Coimbatore, look for well-performing local strains supplied by reputable hatcheries. Factors when selecting seed:

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  • Proven survival and growth under local conditions.
  • Availability of post-larvae (PL) with clear physical activity and uniform size.
  • Health screening and certification from hatcheries.

Site selection and pond types

Choose a site with easy access to water, electricity for aeration, and good road access for inputs and markets. In Coimbatore you can use:

  • Earthen ponds: common for larger-scale operations. Ensure clay content to retain water.
  • High-density lined ponds: PVC or HDPE liners for smaller farms or where seepage is a problem.
  • Circular or rectangular tanks: concrete or ferrocement tanks for intensive culture or RAS integration.

Keep ponds shallow to moderate depth—about 0.8–1.2 m working depth is typical to allow aeration and easy harvesting.

Pond preparation

  • Drain and dry ponds after previous crop. Remove sludge and weeds.
  • Repair bunds and inlets/outlets; ensure predator-proof fencing and bird netting if necessary.
  • Apply lime to adjust pH to neutral or slightly alkaline if needed. Test soil/pore water where possible.
  • Fill with groundwater or bore water; avoid highly saline or contaminated sources. Allow water to stabilise for several days.
  • Establish natural productivity by fertilising with organic manures or controlled inorganic fertilisers to develop natural food (periphyton) before stocking, if adopting semi-intensive systems.

Seed sourcing and acclimatisation

Buy post-larvae (PL) from hatcheries with good track records. Check a sample: active swimming, no deformities, uniform size. Transport in oxygenated bags and minimise stress.

  • Acclimatise by floating transport bags in pond water for 15–30 minutes, then gradually add pond water into the bag before release.
  • Stock only in the early morning or late evening to reduce thermal stress and predation.

Stocking density and culture systems

Choose a system and corresponding stocking density:

  • Extensive: low density (1–2 PL/m2) in fertilised ponds; depends on natural productivity.
  • Semi-intensive: medium density (3–6 PL/m2) with supplementary feeding and aeration.
  • Intensive: higher density (10–30 PL/m2 or more) in tanks or lined ponds with continuous aeration and formulated feed. Requires stronger management and biosecurity.

Start conservatively if you are new: semi-intensive is a practical middle ground for Coimbatore conditions.

Feeding and nutrition

Feeding is the single largest controllable cost. Use a balanced formulated feed designed for freshwater prawns with appropriate protein (often 30–40% depending on growth stage) and attractants. Complement formulated feeds with natural productivity maintenance.

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  • Feed small, frequent portions—2–4 times a day in ponds; continuous supply in intensive tanks via automatic feeders is an option.
  • Monitor feed conversion by observing uneaten feed and adjusting amounts. Avoid overfeeding to prevent water quality deterioration.
  • Provide shelter structures (PVC pipes, bamboo bundles, brushwood) to reduce cannibalism—especially important during moult periods.

Water quality management

Maintain stable water quality; regular monitoring is essential. Key parameters:

  • Temperature: prawns grow best in warm water. Coimbatore’s climate suits year-round culture, but avoid extremes; provide shade if necessary.
  • Dissolved oxygen (DO): keep DO above 4 mg/L for intensive and above 3 mg/L for semi-intensive culture. Install aerators (paddlewheels or diffused aeration) as required—even small farms need reliable oxygenation at night.
  • pH: aim for 7.0–8.5; avoid sudden pH swings.
  • Ammonia and nitrite: keep as low as possible; maintain good aeration and pond management to prevent buildup. Partial water exchange helps in intensive systems.

Disease prevention and biosecurity

Preventive management is cheaper than treatment. Practical measures:

  • Source healthy seed from certified hatcheries.
  • Restrict entry to ponds; disinfect equipment and footwear.
  • Quarantine new batches of seed.
  • Avoid mixing juveniles of widely differing sizes; size variation increases cannibalism and stress.
  • Maintain good water quality and nutrition—stress reduction lowers disease risk.
  • Have a relationship with a local aquatic veterinarian or extension service for rapid diagnosis if mortalities rise.

Harvesting and grading

Harvest strategy depends on market demand and culture system:

  • Partial harvests: remove market-size prawns periodically to reduce density and keep growth of remaining ones rapid.
  • Final harvest: drain or pump down pond/tank and collect prawns using nets. Handle gently to reduce mortalities and quality loss.
  • Size grading before sale helps fetch better prices. Use cool boxes/iced transport for live or chilled prawns to maintain quality to market.

Seasonal considerations for Coimbatore

Coimbatore has a warm climate with moderate to high temperatures most of the year and a distinct monsoon. Practical points:

  • Avoid heavy monsoon inflow of turbid water and contaminants—control inlet flows and use settling ponds if needed.
  • Plan stocking so critical early stages avoid highest rainfall or extremes in runoff that carry pollutants.
  • Use shade structures or floating vegetation to moderate pond temperatures during very hot periods.

Economics and record-keeping

Before starting, calculate input costs (seed, feed, fertiliser, aeration, labour) and realistic production targets for your chosen system. Keep daily records of feed used, mortalities, water quality readings, and growth samples. These records let you calculate feed conversion ratios and production costs and identify issues early.

Practical tips from growers

  • Start with a pilot pond or tank to build experience before scaling up.
  • Maintain simple, consistent routines: same feeding times, daily DO checks, weekly growth sampling.
  • Talk to neighbouring shrimp/prawn farmers about local hatcheries, feed sources, and market channels—local knowledge matters.
  • Invest in a reliable aerator and backup power if possible; oxygen stress causes rapid losses.

Common challenges and solutions

  • High mortality after stocking: likely causes include poor seed quality, abrupt acclimatisation, or low DO. Check seed source and acclimatisation procedures; improve aeration.
  • Slow growth: check feed quality, stocking density, and water quality (temperature, DO, ammonia).
  • Cannibalism and size variability: use shelters, frequent grading, and avoid mixed-size stocking.

Conclusion

Scampi farming in Coimbatore can be profitable with careful site selection, good seed, disciplined feeding and water management, and attention to disease prevention. Begin small, keep detailed records, and scale up once you have consistent results. Local extension services and experienced farmers are valuable partners—use them.

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Ranjeet Natarajan
Ranjeet Natarajan

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

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