Introduction to the RAS System for Industrial Indoor Mud Crab Farming
The RAS (Recirculating Aquaculture System) for industrial indoor mud crab farming is a modern farming mode based on a high-density and controllable environment.
Through recirculating water treatment technology, and in combination with biological, mechanical, and electronic devices, this system simulates the natural growth environment of mud crabs. It achieves water quality purification, temperature regulation, and disease prevention and control, thus getting rid of the traditional farming's dependence on natural water bodies and seasons. In mud crab farming, three-dimensional facilities such as "crab apartments" are often used. The crabs are individually placed in independent farming boxes to avoid cannibalism. At the same time, the recirculating water system enables the efficient utilization of resources.
Components of RAS
Farming Unit:
It adopts a three-dimensional "crab apartment" design. Each farming box separately partitions the mud crabs and simulates the natural cave environment. The material used is food-grade polypropylene (PP), which is safe and non-toxic.
Water Treatment System:
Filtration Device: It includes a high-speed sand filter tank (to remove solid particles), a protein skimmer (to separate organic matter), and a biological filter (to degrade harmful substances such as ammonia nitrogen).
Disinfection Equipment:
Ultraviolet sterilizers or ozone equipment are used to kill pathogens.
Water Quality Monitoring System:
This monitoring system maintains sensors monitor water quality parameters in real time (such as pH, dissolved oxygen content, salinity, etc.).
Recirculating Water Facilities:
Water pumps, water storage tanks, and sewage disposal systems enable the recycling of water bodies and reduce water resource consumption.
Advantages of RAS
High Density and High-efficiency Production:Continuous farming throughout the year significantly increases the output.
Environmental Controllability:Through constant temperature control, water quality regulation, and independent farming units, the risk of disease transmission is reduced, and the survival rate is increased by more than four times.
Resource Conservation:The recycling water utilization rate is high. The minimum monthly power consumption is only about 100 kilowatt-hours, and it occupies a small area (only 1/10 of that of traditional farming).
Quality Assurance:Separate feeding and the controllable environment make the mud crabs uniform in size, excellent in appearance, free of antibiotic residues, and better in taste.
Eco-friendliness:It reduces wastewater discharge, decreases the pollution to natural water bodies, and meets the requirements of green and sustainable development.
Information About Indusrial RAS Crab Growing
1.Average Harvest Weight
Conventional Range: The harvest weight of mud crabs farmed in indoor crab apartments is usually 200-500 grams per crab, which specifically depends on the initial specifications of the crab seedlings and the farming management.
If summer seedlings (15-50 grams per crab) are stocked, they can reach the commercial specifications (about 200-300 grams) after 3-4 months of farming.
If larger-sized crab breeds (such as 50-100 grams per crab) are stocked, the farming cycle is shortened, and the harvest weight can reach more than 300 grams.
During the fattening farming stage (for the mated thin crabs), they can gain weight to reach the specifications of roe crabs (about more than 150-200 grams) within 30-40 days.
2.Farming Cycle
Full Cycle: If starting from crab seedlings (such as C4 stage juvenile crabs), through optimizing water quality, temperature, and feed management in the indoor crab apartments, the farming cycle which is 12-18 months in traditional earthen ponds can be shortened to 6-8 months.
Specific Stages:
Seedling Cultivation: When stocking 15-50 grams of crab seedlings, they can reach the commercial specifications within 3-4 months.
Fattening Stage: For thin crabs or female crabs after mating, it only takes 30-40 days to gain weight to meet the standards of roe crabs.
3.Key Influencing Factors
Temperature Control: The indoor system can maintain the water temperature at 18-25°C (the most suitable growth temperature for mud crabs), avoiding winter dormancy and shortening the growth stagnation period.
Water Quality Management: The crab apartments adopt recirculating water technology, combined with equipment such as protein skimmers and biological filters, to keep the water quality stable (salinity 8-26, pH 7.8-8.5), reducing the occurrence of diseases and the frequency of water changes, and improving the growth efficiency.
Precise Feeding: Using soft pellet feeds or shellfish baits, the daily feeding amount accounts for 8-10% of the body weight. Combined with AI monitoring to reduce the waste of uneaten feeds, the feed conversion rate is improved (low FCR design).
4.Comparative Advantages over Traditional Farming
Shorter Cycle: Traditional earthen pond farming requires 12-18 months (including the overwintering period), while the crab apartments can shorten it to 6-8 months through environmental regulation.
Increased Density: The crab apartments adopt a modular independent box design, and the farming density can reach 4-6 crabs per square meter (in traditional ponds, it is 1-2 crabs per square meter), significantly increasing the yield per unit area.
Optimized Survival Rate: Closed management reduces the risks of enemy organisms (such as gobies) and escapes. With the biosecurity isolation design, the survival rate can be increased to more than 80%.
Technical Specifications
| Usage | For aquaculture |
| Suitable for | Mud crab, blue crab etc |
| Crab box | Modular individual crab boxes |
| Water type | Fresh water or salt water |
| Main equipment | Drum Filter/Protein Skimmer/Biofilter and more |
| Water quality monitoring system | Available |
Some Photos of Crab Box
FAQ:
Q: Are you a factory or a trading company?
A: We are a manufacturer with a factory covering an area of 2,000 square meters and various production equipments.
Q: What is the material of the main structure of your greenhouse? How long can it be guaranteed to be used?
A: The main frame of our greenhouse is generally made of hot-dip galvanized steel. This material has super corrosion resistance. Under normal circumstances, with proper daily maintenance, its service life can reach 15 - 20 years. It can resist common natural disasters such as wind, rain, and snow pressure, providing a stable growing environment for the crops in the greenhouse.
Q: Before placing a large order, we'd like to buy a sample greenhouse to try it out first. Is that possible?
A: Yes. We can send you a small-scale greenhouse by LCL (Less than Container Load) sea shipping.
Q: I have a piece of land and I want to grow some vegetables or raise some fish, but I don't know what kind of greenhouse and what size I need. Can you help me with the design?
A: Of course. You can tell us the size of your land, your expected annual output of vegetables or fish, as well as the local climate information. Based on these data, we can design the style, size and price of the greenhouse for you. We'll also let you know approximately how many workers are needed and how long it will take to complete the installation, and how much yield you can expect in a year.
Q: Do you provide planting technical guidance after I purchase the greenhouse?
A: We have a professional planting technology team. After you purchase the greenhouse, according to the crop varieties you plant, we will customize a detailed planting plan for you, covering all aspects such as sowing time, planting density, fertilization and watering frequency, and key points of pest and disease prevention and control. During the planting process, you can contact our technicians via phone, video, etc. at any time, and they will answer your questions promptly.
Q: How long will it take to receive the greenhouse after placing an order?
A: Generally, for standard-specification greenhouses, production, transportation, installation and commissioning can be completed within 20 - 30 days after you place the order and the deposit arrives. However, if you customize special specifications or configurations, or the quantity you purchase is relatively large, it may take about 40 - 60 days. We will give you an accurate time estimate when signing the contract.
Q: What kind of assistance can you provide during the greenhouse installation?
A: We will provide several ways to help you with the installation: First, we'll provide written installation instructions; second, we'll offer online installation guidance; third, we'll dispatch engineers to your construction site for on-site installation guidance; fourth, if there is our local agent, our agent can also help you with the installation service.
Q: What are the quick solutions when encountering pest and disease problems?
A: First, our technical team will help you accurately identify the types of pests and diseases, which is the key to taking the right countermeasures. Then, according to different pests and diseases, we will provide corresponding biological control, physical control or chemical control solutions. For example, for common pests like aphids, we recommend using physical control methods such as yellow sticky traps combined with biological control methods like releasing ladybugs, so as to minimize the use of chemical pesticides, which can protect the environment while effectively controlling pests and diseases.
Q: What preparations should I make before installation?
A: First, obtain the building permit from the government if required. Second, prepare the tools according to the tool list we send you. Third, get the workers ready. Fourth, prepare the power supply if needed. Fifth, prepare a place to store the goods upon arrival to keep them from getting wet in the rain.
Q: What does your greenhouse after-sales service include?
A: We provide a one-year free warranty service. During the warranty period, for any parts of the greenhouse with non-artificial damage or quality problems caused by natural disasters, we will replace or repair them for free. After one year, we still offer long-term paid maintenance services.
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