Crab Farming Boxes - High Quality RAS System Solution
Crab Farming Boxes - High Quality RAS System Solution
Here’s a comprehensive, actionable solution for high-quality RAS (Recirculating Aquaculture System) crab farming boxes, designed for indoor/vertical intensive production, minimal water use, low stress, and consistent yields, with focus on component selection, system design, operation, and vendor references for commercial deployment.
1. Material & Structure: Food-grade PP, HDPE, or 316 stainless steel (corrosion-proof for salt/freshwater). Modular vertical “crab apartment” design with individual compartments to prevent cannibalism, easy harvesting, and uniform water flow. Typical size per unit: 42×34×18 cm (adjustable for mud crab, blue crab, swimming crab). Stackable for space efficiency, with drainage/oxygenation ports per cell.
2. Water Distribution: Bottom-to-top flow or horizontal cross-flow per compartment; adjustable flow rate (0.8–1.2 L/min per crab) to avoid sediment accumulation and ensure DO > 6 mg/L.
3. Hygiene & Maintenance: Smooth, non-porous surfaces; quick-disassemble panels for cleaning; compatibility with CIP (Clean-in-Place) systems.
Full RAS Process Flow & Key Equipment
Subsystem | Critical Components | Performance Requirements |
Mechanical Filtration | Drum filter (50–80 μm)+sieve/bag filter | Remove >95% of solid particles; automatic backwash; 24/7 operation |
Protein Skimming | Foam fractionator | Remove dissolved organic matter, reduce BOD, stabilize pH |
Biological Treatment | MBBR (moving bed bioreactor) or fluidized bed biofilter | Convert ammonia/NO2⁻ to NO3⁻; HRT 1.5–2 h; media surface area >300 m²/m³ |
Disinfection | UV sterilizer (30–40 mJ/cm²)+ozone (0.5–1 mg/L, controlled contact time) | Eliminate pathogens, prevent disease outbreaks |
Oxygenation & Temperature | Micro-nano bubble aerator, pure oxygen injection; titanium heat exchanger | DO ≥ 6 mg/L; temp stable ±0.5°C (26–28°C for mud crab, 18–22°C for winter species) |
Automation & Monitoring | PLC+SCADA system; online sensors (pH 7.8–8.2, salinity, ORP, ammonia, NO2⁻, DO, temp) | Real-time alerts; auto-adjust flow, oxygen, heating/cooling |
1. Small-scale (1000–5000 crabs): Containerized RAS with 4–8 tiers of boxes, compact footprint, plug-and-play, suitable for farms, research labs, or retail display.
2. Large commercial (10,000+ crabs/year): Multi-tank modular RAS, centralized water treatment plant, redundancy for pumps/filters, integration with automatic feeding systems and waste collection.
1. Stocking: Size-sorted juveniles (≥20 g); 1 crab per compartment to eliminate cannibalism; density up to 30–40 kg/m³ (far higher than pond culture).
2. Water Quality: 10%–15% daily partial water change; keep ammonia <0.1 mg/L, nitrite <0.05 mg/L, nitrate <50 mg/L; pH 7.8–8.2; salinity matched to species (25–30 ppt for mud crab).
3. Feeding: Automated feeders with 3–4 meals/day; feed conversion ratio (FCR) ~1.2–1.5; leftover feed removal within 2 h to prevent water deterioration.
4. Cleaning Cycle: Weekly partial cleaning; monthly full disinfection with hypochlorite (residual <0.3 mg/L before restocking).
5. Power Backup: UPS+diesel generator or solar hybrid system to avoid oxygen failure (RAS cannot tolerate >30 min power outage).
Quality & Compliance Certifications
• Materials: FDA food contact approval, EU EC 1935/2004, ISO 9001 for manufacturing.
• System performance: NSF/ANSI 50, BAP (Best Aquaculture Practices) certification for sustainable RAS.
Vendor & Reference (China/Global)
1. Zhongkehai (Qingdao, China): “Crab Apartment” brand, vertical modular boxes+full RAS integration, with FDA certification, proven in commercial mud crab farms, with after-sales training and maintenance.
2. AquaOptima, Recircula: European suppliers focusing on energy-efficient RAS components for high-salinity crab species.
• Initial investment: Containerized 1000-crab system ~
30,000; large commercial system ~200/m³ water volume.
• Operating cost: Electricity (0.8–1.2 kWh/m³/day), feed, labor; payback period typically 2–3 years with year-round production (2–3 batches/year) and premium market pricing.
1. Confirm crab species, target yield, available space, water source, and budget.
2. Engage a professional RAS integrator for customized box layout, water treatment capacity calculation, and automation design.
3. Perform a 4-week pilot run to optimize water parameters and feeding regime before full-scale stocking.
Would you like me to draft a sample technical specification sheet for your crab farming boxes and RAS components that you can send directly to manufacturers for quotes?
|（注：文档部分内容可能由 AI 生成)