Mud Crab Pond [CULTURE_METHOD] Cage Fattening Analytics
Coastal Brackish Water Performance Report 2023-2024
Fattening Operations
0
Ponds & Cages across Sri Lanka
Crab Production
0 MT
Projected (Crab Cities)
Export Value
$25M
2024 Estimate
Fattening Period
21-40 Days
Average: ~30 days
Production Trends (2024-2027)
Annual mud crab production in metric tons
Species Composition
Regional Production Distribution
Export Markets 2023
Regional Performance Breakdown
Detailed metrics by region
| Region | Active Aquaculture Facilities | Production (MT) | Market Share | YoY Growth | Avg Pond Size (hectares) |
|---|---|---|---|---|---|
|
Negombo/Puttalam (Western/NW)
|
68 | 2,850 | 31.4% | +18.5% | 0.42 |
| Batticaloa (Eastern) | 45 | 2,280 | 25.1% | +22.3% | 0.51 |
| Trincomalee/Jaffna/Mannar (Northern) | 38 | 1,710 | 18.8% | +15.2% | 0.45 |
| Hambantota (Southern - Crab Cities) | 62 | 2,235 | 24.6% | +28.1% | 0.36 |
| TOTAL (Sri Lanka) | 213 | 9,075 | 100% | +21.0% | 0.43 |
Vision 2027 - Mud Crab Production Targets
Data Sources: NAQDA Annual Report 2023 | Central Bank of Sri Lanka | Export Development Board | FAO Statistics 2024
Last Updated: January 31, 2025 | Auto-refreshes from live data sources
International Mud Crab Analytics
Real-time insights into global aquaculture production, trade flows, market trends, and competitive intelligence
Global Production
Market Value
Export Volume
Average Export Price
Top 10 Mud Crab Aquaculture Producers (2024)
Global Market Value
Estimated USD 2024
Average Price/KG
FOB Export Price 2024
Market Growth
CAGR 2020-2024
Major Importing Markets 2024
International Trade Flows 2024
Asia → Americas
Asia → Europe
Intra-Asia Trade
Sri Lanka's Export Routes
Global Price Intelligence
Premium Markets
Mid-Tier Markets
Emerging Markets
12-Month Price Trend
Market Insights
Growing Demand
Global consumption projected to reach 8.2M MT by 2027 (CAGR 5.8%)
Sustainability Premium
ASC/BAP certified mud crab commands 15-20% price premium in Asian markets
Consumer Trends
Value-added products growing 12% annually, especially in North America
Sri Lanka's Competitive Position
Global Market Outlook 2025-2027
Industry experts project continued strong growth driven by protein demand, sustainable practices, and emerging markets
🦀 Mud Crab Aquaculture Knowledge Center
Complete Scientific Database for Mud Crab Fattening & Aquaculture Excellence
Disease Management Encyclopedia
Complete guide to identifying, preventing, and treating common mud crab diseases
White Spot Syndrome Virus (WSSV)
Highly contagious viral disease causing 100% mortality within 3-10 days. White spots on carapace.
Prevention:
- ✓ SPF post-larvae only
- ✓ Strict biosecurity protocols
- ✓ PCR testing before stock deployment
- ✓ Avoid sudden temperature changes
Shell Disease (Exoskeleton Erosion)
Bacterial erosion of carapace causing pitted, black lesions and structural weakness.
Prevention & Treatment:
- ✓ Maintain optimal water quality (salinity 17.5-20 ppt)
- ✓ Reduce organic matter & stocking density
- ✓ Apply probiotics (Bacillus)
- ✓ Quarantine infected crabs immediately
Parasitic Infections (Barnacles, Dinoflagellates)
Parasite infestation causing reduced growth, feeding difficulties, and secondary infections.
Prevention:
- ✓ Use clean water sources
- ✓ Regular system cleaning & disinfection
- ✓ Maintain optimal water quality
- ✓ Monitor crabs for parasite signs
Vibriosis
Bacterial infection causing luminescence, shell disease, and systemic infection.
Treatment & Prevention:
- ✓ Probiotic application (Bacillus sp.)
- ✓ Reduce organic matter
- ✓ Maintain DO >5 mg/L
- ✓ Avoid overfeeding
Cannibalism & Limb Loss (Aggressive Behavior)
Crabs attack and cannibalize weaker individuals in communal culture, causing significant losses.
Prevention:
- ✓ Use individual compartments/compartmentalized ponds
- ✓ Avoid overcrowding (5-10/m² max in compartments)
- ✓ Proper feeding (5-8% body weight/day)
- ✓ Reduce stress, maintain water quality
Black Gill Disease
Fungal infection of gills causing black/brown discoloration and respiratory distress.
Treatment & Prevention:
- ✓ Improve water circulation
- ✓ Increase aeration (DO >6 mg/L)
- ✓ Reduce stock deployment density
- ✓ Apply probiotics
🚨 Emergency Disease Response Protocol
STEP 1: Immediate Actions
- • Stop feeding immediately
- • Increase aeration to maximum
- • Collect samples for lab testing
- • Isolate affected culture system
STEP 2: Diagnosis
- • PCR testing for viral diseases
- • Bacterial culture for Vibrio
- • Microscopy for parasites
- • Water quality analysis
STEP 3: Treatment/Control
- • Apply specific treatments
- • Consider early production output
- • Disinfect equipment
- • Report to NAQDA
Water Quality Management Guide
Essential parameters and optimal ranges for successful mud crab fattening and aquaculture
Dissolved Oxygen (DO)
>5 mg/L
Optimal: 6-8 mg/L
Increase DO:
- • Paddlewheel aerators
- • Reduce feeding
- • Water exchange
pH Level
7.5-8.5
Optimal: 8.0-8.3
Adjust pH:
- • Low: Add lime (CaCO₃)
- • High: Organic acids
- • Gradual changes only
Salinity
15-25 ppt
Optimal: 17.5-20 ppt
Species Tolerance:
- • S. serrata: 15-25 ppt tolerable
- • S. olivacea: 15-30 ppt
- • Gradual acclimation recommended
Temperature
26-32°C
Optimal: 28-30°C
Temperature Effects:
- • <25°C: Slow growth
- • >33°C: Stress, disease
- • Sudden changes: Critical
Ammonia (NH₃)
<0.1 mg/L
Toxic at: >0.5 mg/L
Control: Reduce feeding, water exchange, improve aeration
Nitrite (NO₂⁻)
<0.5 mg/L
Toxic at: >1.0 mg/L
Control: Salt addition (Cl⁻), water exchange, probiotics
Alkalinity
80-150 mg/L
Stabilizes: pH levels
Increase: Lime, sodium bicarbonate
📅 Daily Water Quality Testing Schedule
Early Morning (6 AM)
- ✓ DO (lowest point)
- ✓ Temperature
- ✓ pH
- ✓ Visual inspection
Noon (12 PM)
- ✓ DO
- ✓ Temperature
- ✓ pH
- ✓ Feeding Management observation
Evening (6 PM)
- ✓ DO (highest point)
- ✓ Temperature
- ✓ pH
- ✓ Feeding Management check
Weekly Tests
- ✓ Ammonia
- ✓ Nitrite
- ✓ Alkalinity
- ✓ Transparency (Secchi disk)
Feeding Management Management & Nutrition
Complete guide to feed formulation, feeding rates, and FCR optimization
🔬 Ideal Feed Composition
From fishmeal, soybean meal, etc.
Fish oil, squid oil, soybean oil
Wheat flour, cassava
Minerals (Ca, P, etc.)
📊 Feeding Management Rate Table (% Body Weight/Day)
| Mud Crab Size (g) | Body Weight (%) | Frequency (times/day) |
|---|---|---|
| Juvenile (1-5g) | N/A | Natural feeding |
| 0.1-1.0 | 8-12% | 5-6 |
| 1-5 | 6-8% | 4-5 |
| 5-10 | 4-6% | 3-4 |
| 10-15 | 3-4% | 3 |
| 15-20 | 2.5-3% | 2-3 |
| >20 | 2-2.5% | 2 |
💡 Pro Tip:
- • Use feeding trays to monitor consumption
- • Reduce feeding if >20% feed remains
- • Adjust based on growth rate
- • Target FCR: 1.2-1.5
✅ Feed Quality Checklist
Physical Quality
- ✓ Water stability >2 hours
- ✓ Uniform pellet size
- ✓ No mold or rancidity
- ✓ Proper storage (dry, cool)
Nutritional Quality
- ✓ Protein >35%
- ✓ Essential amino acids
- ✓ Omega-3 fatty acids
- ✓ Vitamins & minerals
Functional Quality
- ✓ Attractants added
- ✓ Immunostimulants
- ✓ Probiotics included
- ✓ Digestive enzymes
Storage Guidelines
- ✓ Temp: <25°C
- ✓ Humidity: <60%
- ✓ Use within 3 months
- ✓ Elevate from floor
Broodstock Management & Hatchery Management
From broodstock selection to post-larvae production
Broodstock Selection Criteria
Weight & Size
- • Market size: 200-300g fresh weight
- • Maturity: 16cm length or 200g
Physical Characteristics
- • Normal body shape & coloration
- • Complete appendages (no missing legs)
- • Clean gills & carapace
- • Active swimming behavior
Health Status
- • Disease-free, no shell lesions
- • No visible parasites or gill disease
- • Active, normal molting cycle
Maturation Protocol
Eyestalk Ablation
- • Unilateral ablation (remove one eyestalk)
- • Sterilize equipment
- • Apply antibiotic ointment
- • Maturation time: 3-5 days
Maturation Tank Conditions
- • Temperature: 28-30°C
- • Salinity: 30-35 ppt
- • Photoperiod: 12h light, 12h dark
- • Gentle aeration
Feeding Management for Maturation
- • Fresh squid, polychaete worms
- • Artemia, mussel meat
- • Feed 4-5 times daily
- • 15-20% body weight per day
🦐 Larval Development Stages
Nauplius
Day 0-2
- • Size: 0.3-0.4 mm
- • No feeding
- • Uses yolk sac
- • 6 stages (N1-N6)
Zoea
Day 2-5
- • Size: 0.8-1.5 mm
- • Feed: Diatoms
- • 3 stages (Z1-Z3)
- • Density: 80-100/L
Mysis
Day 5-8
- • Size: 1.5-3.0 mm
- • Feed: Artemia
- • 3 stages (M1-M3)
- • Density: 60-80/L
Post-Larvae
Day 8-12
- • Size: 3-6 mm
- • Feed: Artemia+Feed
- • PL1-PL4
- • Density: 40-60/L
PL for Sale
Day 12-20
- • Size: 6-12 mm
- • Feed: Formulated
- • Juveniles 1-2cm
- • Ready for pond or cage
Acclimation
Before Stock Deployment
- • Temp: Gradual
- • Salinity: Adjust
- • Time: 2-3 hours
- • Stress test
Downloadable Resources
Complete Mud Crab Production Manual
200-page comprehensive guide covering all aspects of mud crab aquaculture
Excel Calculators
ROI, FCR, feeding rate, stock deployment density calculators
Video Tutorials
50+ hours of practical training videos from experts
Complete Mud Crab Fattening Guide
Step-by-Step Guide from Broodstock to Market
🇱🇰 Specifically for Sri Lankan Producers
30-40 Day Fattening Timeline
Planning & Licensing
Duration: 30-45 days | Cost: Rs. 150,000 - 300,000
AI-Generated Image:
"Sri Lankan mud crab pond or cage planning office with maps and documents"
1.1 Site Selection & Feasibility Study
Choose optimal location for mud crab pond or cage in Sri Lanka
Best Mud Crab Production Locations in Sri Lanka:
- ✓ Negombo/Puttalam: 35% of production - Lagoon & brackish areas
- ✓ Batticaloa: 28% production - Coastal lagoon systems
- ✓ Northern (Jaffna/Mannar): 21% - Sheltered coastal waters
- ✓ Hambantota: 16% - Crab City operations, mangrove areas
Mud Crab Pond Site Requirements:
- • Substrate: Brackish to marine (mud-sand mix, mangrove areas)
- • Water Depth: 0.8-2.5 meters (tidal considerations)
- • Salinity: 15-30 ppt (brackish-marine transition)
- • Protected Area: Sheltered from strong tidal currents
- • Access: Road/water access for feed & supply delivery
- • Size: Minimum 500-2000 m² pond or cage system
💰 Cost Breakdown:
- • Substrate analysis: Rs. 20,000
- • Water quality testing: Rs. 15,000
- • Marine survey & mapping: Rs. 40,000
- • Marine consultant fees: Rs. 60,000
⏱️ Timeline:
- • Site visits: 3-5 days
- • Testing: 7-10 days
- • Analysis: 5-7 days
- • Report: 3-5 days
1.2 Obtain NAQDA License & Permits
Complete all legal requirements for mud crab aquaculture in Sri Lanka
🚨 MANDATORY Requirements:
- NAQDA Registration: Apply at regional NAQDA office
- Aquaculture License: Submit pond or cage plans, EIA report
- Coastal Conservation Permit: If within 300m of coast
- CEA Approval: Environmental clearance certificate
- Local Authority Approval: Pradeshiya Sabha/Municipal Council
📋 Documents Needed:
- ✓ Land ownership documents
- ✓ Survey plan
- ✓ Feasibility study report
- ✓ Water quality test results
- ✓ NIC copies
- ✓ Business registration
- ✓ Bank details
- ✓ Passport photos
💵 License Fees (2025):
1.3 Crab Pen Design & Engineering
Professional culture system design and infrastructure planning
AI-Generated Video Tutorial
"3D Animation: Ideal Mud Crab Culture System Design for Sri Lankan Climate"
Standard Culture System Specifications:
Size & Shape:
- • Area: 0.5 - 2.0 hectares per culture system
- • Shape: Rectangular (L:W = 3:1 to 5:1)
- • Depth: 1.2 - 1.8 meters
- • Freeboard: 0.5 meters minimum
Infrastructure:
- • Dike width: 3-4 meters (top)
- • Slope: 1:2 to 1:3 (inside)
- • Drainage: Central drain with slope
- • Gates: Monk-type inlet/outlet
💰 Engineering Costs (per hectare):
Phase 1 Summary:
Total Duration:
30-45 days
Total Cost:
Rs. 250K - 300K
Success Metric:
✓ All permits obtained
Construction Phase
Duration: 30-60 days | Cost: Rs. 2,500,000 - 5,000,000 per hectare
AI-Generated Time-lapse Video:
"Crab Pen Installation - From Posts to Nets"
2.1 Crab Pen Construction
Install support posts and framework in shallow coastal waters
⚠️ Crab Pen Construction Requirements:
- • Install bamboo or PVC posts (2-3m spacing)
- • Posts driven 1-1.5m into seabed substrate
- • Height: 1.5-2m above seabed (depending on tide)
- • Secure with guy wires and anchors
- • Protected from strong currents and waves
💰 Cost per 10,000 m² Pen:
- • Bamboo/PVC posts: Rs. 150,000
- • Labor & installation: Rs. 200,000
- • Anchoring materials: Rs. 100,000
- • Total: Rs. 450,000
📊 Pen Specifications:
- • Water Depth: 0.5-2 meters
- • Enclosure Size: 5,000-20,000 m²
- • Substrate: Seagrass/sandy-mud
- • Location: Protected coastal bay
2.2 Net Enclosure Installation
Install nets around posts to create secure pond or cage
Net Specifications:
- ✓ Mesh Size: 6-10mm (prevents escape)
- ✓ Material: UV-resistant HDPE/nylon
- ✓ Net Height: 1.5m above seabed to surface
- ✓ Bottom Net: Anchored to substrate
- ✓ Top Portion: Above high tide mark
- ✓ Entry Gate: 1m × 1m with zippered closure
💵 Net Installation Costs (10,000 m²):
2.3 Water System Installation
Install inlet, outlet, and drainage systems
AI Image: "Modern mud crab culture system water gate system"
Required Components:
Inlet System:
- • PVC pipes (200-300mm): Rs. 150,000
- • Monk-type gates: Rs. 100,000
- • Screens (40 mesh): Rs. 50,000
- • Reservoir tank: Rs. 200,000
Outlet/Drainage:
- • Central drain: Rs. 80,000
- • Production Output sump: Rs. 120,000
- • Outlet gates: Rs. 80,000
- • Total: Rs. 780,000
Phase 2 Summary:
Duration:
30-60 days
Cost per Hectare:
Rs. 2.5M - 5M
Success Metric:
✓ Culture Systems hold water
Culture System Preparation
Duration: 7-14 days | Cost: Rs. 80,000 - 150,000 per hectare
3.1 Culture System Bottom Preparation
Clean, level, and treat culture system bottom
Pre-Stock Deployment Checklist:
- ✓ Remove all residual sludge and organic matter
- ✓ Sun-dry culture system bottom for 7-10 days (kills pathogens)
- ✓ Apply lime (250-500 kg/ha) to adjust pH and sanitize
- ✓ Plow bottom to oxidize toxic compounds
- ✓ Check for crab burrows and seal them
💰 Treatment Costs:
- • Agricultural lime: Rs. 40,000
- • Labour: Rs. 25,000
- • Tilling equipment: Rs. 15,000
⏱️ Timeline:
- • Cleaning: 1-2 days
- • Sun drying: 7-10 days
- • Liming: 1 day
- • Final check: 1 day
3.2 Install Aeration System
Set up paddlewheel aerators and air diffusers
Aeration Requirements for Sri Lanka:
- • Paddlewheel aerators: 1 per 0.5 hectare (1 HP each)
- • Placement: Strategic positioning for maximum circulation
- • Operating hours: 16-18 hours/day during grow-out
- • Backup: Generator for power failures (common in SL)
💵 Equipment Costs:
Phase 3 Summary:
Duration:
7-14 days
Cost:
Rs. 900K - 1.2M
Success:
✓ Ready for water
Water Filling & Conditioning
Duration: 3-5 days | Cost: Rs. 50,000 - 100,000
4.1 Fill Culture System with Filtered Water
Gradually fill culture system through filtration system
Water Filling Protocol:
- • Fill through 40-60 mesh bag filters to remove predators
- • Target depth: 1.0-1.2 meters initially
- • Fill time: 24-48 hours (gradual to prevent erosion)
- • Salinity target: 15-35 ppt (ideal 25-30 ppt)
- • Check for leaks during filling process
💰 Water Treatment Costs:
4.2 Water Quality Conditioning
Prepare water chemistry for PL stock deployment
Target Water Parameters:
- • pH: 7.5-8.5
- • Salinity: 25-30 ppt
- • Temperature: 28-32°C
- • DO: >5 mg/L
- • Alkalinity: 100-150 ppm
- • Ammonia: <0.1 ppm
- • Transparency: 30-40 cm
- • Bloom: Light green color
Phase 4 Summary:
Duration:
3-5 days
Cost:
Rs. 50K - 100K
Success:
✓ Optimal conditions
Post-Larvae Stock Deployment
Duration: 1 day | Cost: Rs. 750,000 - 1,200,000 per hectare
AI-Generated Image:
"Healthy post-larvae mud crab being acclimated in bags before release"
5.1 Source Quality Post-Larvae
Purchase SPF (Specific Pathogen Free) PL from certified hatcheries
🏭 Certified Hatcheries in Sri Lanka:
- • NAQDA Hatcheries: Pambala, Batticaloa (Govt. certified)
- • Private Hatcheries: Chilaw, Kalpitiya areas
- • Species: Giant Mud Crab (Scylla scabra)
- • Size: 1-2cm juveniles preferred
- • Health Cert: MANDATORY from NAQDA before purchase
💰 PL Costs (2025 Rates):
5.2 Acclimation & Release
Properly acclimate PL to culture system conditions before release
⚠️ Critical Acclimation Steps:
- Temperature matching: Float bags in culture system for 30 minutes
- Gradual mixing: Add culture system water to bags slowly over 1 hour
- Salinity check: Must match within 2 ppt
- pH adjustment: Gradual transition over 2 hours
- Morning release: Early morning (6-8 AM) preferred
- Stress minimization: Avoid direct sunlight, handle gently
✓ Post-Stock Deployment Monitoring:
- • Count survival after 24 hours (expect 5-10% mortality)
- • Monitor feeding behavior in first 3 days
- • Check water quality parameters twice daily
- • Record stock deployment date, density, and PL source
Phase 5 Summary:
Duration:
1 day
Cost/ha:
Rs. 750K - 1.2M
Success:
✓ >90% survival
Feeding Management Management
Duration: 90-120 days | Cost: Rs. 1,200,000 - 1,800,000 per hectare
6.1 Feed Selection & Schedule
Choose quality feed and implement feeding program
Sri Lankan Feed Suppliers:
- • CIC Feeds: Complete crustacean feeds (CP 35-40%)
- • Cargill Ceylon: Premium aquafeed range
- • PRIMA Ceylon: Cost-effective options
- • Current price: Rs. 150-220 per kg (depending on protein %)
Feeding Management Schedule by Growth Stage:
| Days | Size | Feed %BW | Frequency |
|---|---|---|---|
| 1-30 | 0.5-3g | 8-10% | 4 times/day |
| 31-60 | 3-10g | 5-7% | 3 times/day |
| 61-90 | 10-18g | 3-5% | 3 times/day |
| 91-120 | 18-25g | 2-3% | 2 times/day |
💰 Total Feed Cost (120-day cycle):
6.2 Feed Monitoring
Use feed trays to optimize feeding efficiency
Check Tray Method:
- ✓ Place 4-6 check trays per hectare
- ✓ Check after 2-3 hours of feeding
- ✓ Ideal: 20-30% feed remaining
- ✓ Adjust next feeding based on consumption
- ✓ Check tray cost: Rs. 2,000 each
Phase 6 Summary:
Duration:
90-120 days
Feed Cost/ha:
Rs. 1.3M - 2M
Success:
✓ FCR < 1.5
Water Quality Monitoring
Duration: Daily throughout cycle | Cost: Rs. 150,000 - 250,000
7.1 Daily Parameter Testing
Monitor critical water quality parameters
🔬 Daily Testing Schedule:
Morning (6:00 AM):
- • Dissolved Oxygen (DO)
- • Temperature
- • pH
- • Transparency (Secchi disk)
Afternoon (3:00 PM):
- • DO (again)
- • Temperature
- • Salinity
- • Observe mud crab behavior
Weekly Laboratory Tests:
- • Ammonia-N (NH₃-N): <0.1 ppm
- • Nitrite-N (NO₂-N): <0.1 ppm
- • Nitrate-N (NO₃-N): <20 ppm
- • Alkalinity: 100-150 ppm
- • Send samples to NAQDA lab (Colombo/Batticaloa)
💰 Testing Equipment & Costs:
7.2 Record Keeping & Data Analysis
Maintain detailed records for trend analysis
📊 Record Book Requirements:
- ✓ Date & time of each measurement
- ✓ All water parameters (DO, pH, salinity, etc.)
- ✓ Weather conditions
- ✓ Feed given and consumption rate
- ✓ Mud Crab sampling results (growth)
- ✓ Any observations or abnormalities
- ✓ Mandatory for NAQDA inspections!
Phase 7 Summary:
Frequency:
Daily
Equipment Cost:
Rs. 165K
Success:
✓ Stable parameters
Health Management
Duration: Ongoing | Cost: Rs. 100,000 - 300,000
AI-Generated Image:
"Healthy mud crab - disease-free shell and appendages"
8.1 Disease Prevention Protocol
Implement biosecurity measures
🛡️ Biosecurity Measures:
- • Foot baths with iodine at all entry points
- • Limit pond or cage visitors (use visitor log)
- • Dedicated equipment per culture system (no sharing)
- • Disinfect nets and tools daily
- • Bird netting to prevent predator access
- • Screen all incoming water (40-60 mesh)
⚠️ Common Diseases in Sri Lanka:
- • WSSV (White Spot): Notify NAQDA immediately if suspected
- • EMS/AHPND: Early mortality syndrome - monitor closely
- • Vibriosis: Bacterial infection - maintain water quality
- • Black Gill: Poor aeration - increase DO
8.2 Weekly Health Checks
Physical examination of mud crab samples
Sample 30-50 mud crabs weekly and check:
- ✓ Shell condition (no fouling)
- ✓ Gill color (pale pink, not black)
- ✓ Hepatopancreas (firm, tan color)
- ✓ Gut fullness (80-100% full)
- ✓ Swimming behavior (active)
- ✓ Active feeding behavior
- ✓ Uniform size distribution
- ✓ No deformities
Phase 8 Summary:
Frequency:
Weekly checks
Biosecurity Cost:
Rs. 100K - 300K
Success:
✓ Zero disease
Growth Tracking
Duration: Weekly sampling | Cost: Rs. 20,000
9.1 Weekly Biomass Sampling
Track growth rate and predict production output
Sampling Procedure:
- 1. Use cast net to collect 100-200 mud crabs
- 2. Weigh total sample and count individuals
- 3. Calculate Average Body Weight (ABW)
- 4. Estimate total culture system biomass
- 5. Adjust feeding rates based on biomass
- 6. Record in logbook with date and DOC (Days of Culture)
Expected Growth Curve (Sri Lankan conditions):
| DOC | ABW (g) | Weekly Growth |
|---|---|---|
| 30 | 3-5g | 1.0-1.5g/week |
| 60 | 10-12g | 1.5-2.0g/week |
| 90 | 18-20g | 2.0-2.5g/week |
| 120 | 25-28g | Target production output size |
Phase 9 Summary:
Frequency:
Weekly
Equipment:
Cast net + scale
Target ABW:
25-28g
Production Process
Duration: 1-3 days | Cost: Rs. 200,000 - 400,000
AI-Generated Video:
"Time-lapse of mud crab culture system harvesting operation in Sri Lanka"
10.1 Pre-Production Output Preparation
Prepare for production output 24 hours in advance
24 Hours Before Production Output:
- • Stop feeding (empty gut for better quality)
- • Arrange buyers/processors (pre-book with prices)
- • Prepare ice (3-5 tons per hectare)
- • Organize production output crew (15-20 workers per ha)
- • Check nets, baskets, crates are ready
- • Notify NAQDA inspector for certification
Best Production Output Timing:
- ✓ Early morning (4-6 AM) - coolest temperature
- ✓ Mud crabs are most active, easier to catch
- ✓ Minimal stress, better survival during transport
- ✓ Can reach processing plant fresh same morning
10.2 Production Output Execution
Drain culture system and collect mud crabs
Harvesting Method:
- Gradual draining: Open outlet gate slowly over 6-8 hours
- Harvest sump: Collect mud crabs at harvest sump with bag nets
- Immediate icing: Place in ice-water slurry (1:1 ratio)
- Count & grade: Separate by size (Large, Medium, Small)
- Pack in crates: 20kg per crate with ice layers
- Transport ASAP: To processing plant within 4 hours
💰 Production Output Costs (per hectare):
Phase 10 Summary:
Duration:
1-3 days
Production Output Cost/ha:
Rs. 200K
Expected Yield:
6-7.5 tons/ha
Post-Production Output Processing
Duration: 1-2 days | Processing fee: Rs. 150-250/kg
11.1 Processing Plant Options in Sri Lanka
Choose certified processing facility
🏭 Major Processing Plants:
- • Seawinn Aqua Products: Puttalam (EU approved)
- • Ruhunu Seafood Processors: Hambantota
- • Lanka Crustacean Processors: Chilaw
- • Requirements: EU HACCP certified, NAQDA approved
- • Payment: Usually within 7-14 days after processing
Processing Steps:
- 1. Reception & weighing (fresh weight recorded)
- 2. Washing & grading by size (count per kg)
- 3. De-heading (if HOSO or HLSO)
- 4. Freezing (-18°C to -25°C)
- 5. Glazing (ice coating for protection)
- 6. Packing (IQF boxes, 2kg blocks)
- 7. Storage in cold room (-20°C)
- 8. Export documentation & shipping
11.2 Quality Grading & Pricing
Understand market grading system
💵 2025 Export Prices (FOB Sri Lanka):
| Grade (count/kg) | Size | Price (Rs/kg) |
|---|---|---|
| 30-40 | Large | Rs. 1,500-1,800 |
| 40-50 | Medium-Large | Rs. 1,200-1,500 |
| 50-60 | Medium | Rs. 1,000-1,200 |
| 60-70 | Small-Medium | Rs. 800-1,000 |
| 70+ | Small | Rs. 600-800 |
*Prices for whole frozen (HOSO - Head-On Shell-On)
Phase 11 Summary:
Duration:
1-2 days
Processing Fee:
Rs. 150-250/kg
Avg. Price:
Rs. 1,200/kg
Export & Marketing
Duration: Ongoing | Revenue: Rs. 7M - 12M per hectare
AI-Generated Infographic:
"Sri Lankan mud crab export destinations world map with volumes and prices"
12.1 Export Markets & Destinations
Major export markets for Sri Lankan mud crab
🌍 Top Export Destinations (2024):
Europe (55%):
- • Germany (largest market)
- • Netherlands
- • UK
- • Belgium
Asia & Others (45%):
- • Japan (premium prices)
- • USA
- • Middle East
- • Australia
📋 Export Documentation Required:
- ✓ Health Certificate from NAQDA
- ✓ Processing plant EU approval number
- ✓ SLSI (Sri Lanka Standards) certification
- ✓ Commercial invoice & packing list
- ✓ Certificate of Origin (Chamber of Commerce)
- ✓ Bill of Lading / Airway Bill
12.2 Revenue Calculation & Profitability
Expected returns from 1 hectare pond or cage
💰 Revenue Breakdown (1 hectare, 120 days):
📊 Cost Breakdown:
✅ PROFIT SUMMARY:
🎉 CONGRATULATIONS! PRODUCTION CYCLE COMPLETE! 🎉
Cycle Duration:
120 days
Total Production:
7,000 kg
Net Profit:
Rs. 3.75M
Annual Potential:
Rs. 9.38M
Sri Lankan Mud Crab Fattening Cost Calculator
Estimated Costs (LKR)
Expected Returns:
📥 Download Production Guides
📝 Aquaculture License Center
Choose your license type and complete the application
Production License
For mud crab production facilities & operations
Hatchery License
For post-larvae & seed production facilities
Export License
For international mud crab export operations
Processing License
For value-added processing facilities
📌 What Happens Next?
1-3 working days
NAQDA officer visit
License fee payment
Digital & physical copy
Need help with your application? Contact NAQDA Licensing Office: 011-2345678 | licenses@naqda.gov.lk
Life of Scylla scabra
Journey from larval stage to market-ready mud crab (600-800g) in 3-4 months
Complete Lifecycle Video Series
AI-Generated Educational Content - Watch the entire journey
Microscopic Journey - Egg to Juvenile
Watch the transformation through life stages: egg, zoea, megalopa, crablet to juvenile
Mud Crab Growth Phases
Complete grow-out cycle from juvenile stocking (1-5g) to market size (200-300g) with underwater footage
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Egg Stage
Size: 0.25-0.30 mm
Duration: 12-16 hours
Temperature: 28-30°C
Key Process: Fertilization & cell division
Nauplius
Size: 0.30-0.50 mm
Duration: 2-3 days
Stages: Nauplius I-VI
Feeding Management: Uses yolk sac (no external feed)
Zoea
Size: 1-2 mm
Duration: 4-5 days
Stages: Zoea I-III
Feeding Management: Microalgae (diatoms)
Mysis
Size: 2-5 mm
Duration: 3-4 days
Stages: Mysis I-III
Feeding Management: Artemia nauplii
Post Larvae (PL)
Size: 5-10 mm
Duration: 10-15 days
Stage: PL1 to PL15
Feeding Management: Formulated feed
Growth Phases in Production Facility
Juvenile Phase
Day 1-30
High mortality risk. Maintain DO >5 mg/L
Sub-Adult Phase
Day 30-75
Peak growth period. Monitor feed conversion
Market Size
Day 75-120
Optimal size: 20-30g (40-50 count/kg)
Water Quality Parameters
Critical: Never below 3 mg/L
Optimal: 8.0-8.2
Ideal: 29-31°C
Optimal: 15-20 ppt
Nutrition Requirements
Higher for juveniles, lower for adults
Essential fatty acids (EPA, DHA)
Energy source for metabolism
Lower is better (more efficient)
- • 6:00 AM - 20% of daily ration
- • 11:00 AM - 25% of daily ration
- • 4:00 PM - 30% of daily ration
- • 9:00 PM - 25% of daily ration
Complete Production Cycle Summary
Hatchery Phase
Egg to 1-2cm juvenile
Crab Pen Grow-out
Juvenile (1-5g) to market (200-300g)
Market Weight (Fresh)
16-22cm length | ~40g dried
Survival Rate
At 1-2 ind/m² density
Growth Rate
Juveniles (1-5g) reach market size (200-300g) in approximately 6 months under optimal conditions.
Feeding Behavior
Detritivores - feed on organic matter in sediment. Supplemental feeding with rice bran (0.2-0.5 kg/m² bi-weekly) enhances growth.
Reproduction
Spawning typically occurs in warmer months. Females release ~1.9 million eggs per spawning event.
Real Producers, Real Results
Watch how Sri Lankan mud crab producers transformed their businesses with NAQDA support and Best Management Practices
From 5 to 50 Culture Systems in Just 3 Years
Pradeep Fernando, a small-scale producer from Puttalam, revolutionized his mud crab fattening operation using NAQDA's technical guidance and Best Management Practices. Starting with just 5 ponds, he now operates 50 ponds and produces 125 MT annually, creating 35 jobs in his community.
Sustainable Aquaculture Excellence
Thanuja Perera achieved 95% survival rate using eco-friendly probiotics and earned export quality certification for EU markets.
Technology-Driven Innovation
Sunil Jayasinghe implemented IoT sensors and AI-powered monitoring, reducing feed costs by 30% while increasing yield by 25%.
Young Entrepreneur Success
At just 22 years old, Kasun Silva exports to 3 countries and has created 15 jobs for people in his village community.
Women Empowerment Leader
Nirmala Rajapakse leads an 8-pond or cage women's cooperative, pioneering organic zero-antibiotic aquaculture methods.
Premium Export Quality
Arjuna Silva achieved EU & USA certifications with 100% blockchain traceability system for premium markets.
Community Transformation
Rohan Perera trained 50 local youth, creating a skilled workforce and lifting his entire village economy.
Collective Impact
Ready to Write Your Success Story?
Join thousands of successful producers across Sri Lanka who transformed their businesses with NAQDA support
Realistic Business Calculator
Based on NARA 2023 Case Study with REAL market data: LKR 960-975/kg pond or cage-gate price, Time-of-Use electricity, 15% export tax rate, 4-14% loan schemes, and 24-month cash flow projection.
🏭 Step 1: Choose Your Business Model
🎯 Load Proven NARA 2023 Case Studies
Production Parameters
1 hectare = 10,000 m²
📘 NARA: 37 PL/m² (earthen) | 📗 100 PL/m² (HDPE)
📘 NARA: 63% actual | Industry: 63-85%
Typical: 18-22g
📘 NARA: 1.3 (EXCELLENT) | Good: < 1.5
📘 NARA: 120 days (4 months)
📘 NARA: 2 cycles/year | HDPE: 2.5
📊 Auto-Calculated Production Metrics
Operating Costs (Per Cycle)
📘 NARA: Rs. 1.10 | Market range: 1.10-1.25
⚠️ 55% of OpEx! Volatile: Rs. 200-280
📘 NARA: Rs. 400,000/cycle (~15% of OpEx)
📘 NARA: Rs. 60,000/month (~9% of OpEx)
Generator fuel, transport to market
Equipment repairs, culture system maintenance
💰 Cost Structure (Industry Benchmarks)
⚡ Time-of-Use (TOU) Electricity Model
GAME-CHANGER for Profitability!
Sri Lankan electricity has HUGE price differences by time of day. Smart scheduling can save LKR 2-3M per year!
Typical pond or cage: 5,000-10,000 kWh/month (aerators, pumps)
📊 Allocate Usage by Time Period
Adjust sliders to match when you run pumps, aerators, and other equipment. Moving usage to off-peak saves money!
💰 Electricity Cost Breakdown
Revenue & Market Prices
CRITICAL: Use REAL Market Prices!
Many calculators use inflated prices (Rs. 1,500/kg), leading to unrealistic projections. NARA 2023 case study shows actual pond or cage-gate price: Rs. 975/kg.
📘 NARA: Rs. 975/kg (PROVEN) | Market: 950-975
Processor export: USD 6-8/kg = Rs. 1,840-2,460
💡 Export gets 15% tax rate (vs 30% domestic) = Massive savings!
🎯 Export Tax Incentive (CRITICAL ADVANTAGE!)
Standard corporate tax rate on domestic revenue
Reduced rate for foreign exchange earners!
- 100% domestic sales = Pay Rs. 3.0M tax (30%)
- 100% export sales = Pay Rs. 1.5M tax (15%)
- Savings from exporting: Rs. 1.5M!
🏦 Financing Options & Government Support
NAQDA Government Subsidy Scheme 2026
New aquaculture facilities may qualify for 60% government funding! This reduces your required capital from 100% to just 40%.
💰 Financing Impact on Rs. 10M Loan (7 years)
📊 Financial Results
📈 24-Month Cash Flow Projection
🎯 Sensitivity Analysis
Impact of ±10% change in key variables on annual profit
📊 Comparison to NARA 2023 Case Study
✅ Business Viability Assessment
Mud Crab Business Calculator
Complete Cost Analysis & Profit Projections
🇱🇰 Sri Lankan Market Data & Benchmarks
Step 1: Select Business Type
Step 2: Basic Details
Step 3: Production Parameters
1 ha = 2.47 acres
Industry: 60-100 PL/m²
Typical: 70-90%
Target: 20-25g
Standard: 100-120 days
Typical: 2-3 cycles
Good: 1.1-1.5
Step 4: Initial Capital Investment
A. Land & Infrastructure
Or annual lease cost
Industry: Rs. 5.7M-12M/ha
Range: Rs. 300K-800K
B. Equipment & Machinery
Rs. 200K-300K per unit
Range: Rs. 300K-600K
Range: Rs. 900K-1.2M
Range: Rs. 465K-600K
DO meter, pH meter, etc.
C. Licenses & Permits
Annual: Rs. 25,000
CEA, Coastal, etc.
D. Working Capital
Typical: 6-8 months
Step 5: Operating Costs (Per Cycle)
Variable Costs
SPF quality: Rs. 2,500-4,000
Range: Rs. 260-330/kg
Typical: 3%
Major cost item
Fixed Costs (Per Cycle)
Rs. 8K-12K per worker
Step 6: Pricing & Revenue
Domestic: Rs. 450-600/kg
Export: Rs. 600-900/kg
0-100%
Step 7: Financing Options (Optional)
Leave 0 for no loan
Typical: 4-9%
Typical: 5-7 years
Typical: 6-12 months