# Eel Farming: Hatchery, Grow-Out, and Harvest Systems ## Key Takeaways - Eel aquaculture relies on specific *Anguilla* species, with Japanese and European eels dominating global production; responsible sourcing of glass eels is critical due to conservation status, necessitating strict documentation for trade. - Recirculating Aquaculture Systems (RAS) are preferred for grow-out, requiring precise control of water quality parameters: temperature (24-28°C), dissolved oxygen (>5 mg/L), ammonia (<0.5 mg/L), nitrite (<0.1 mg/L), and pH (6.5-8.0). - High-protein diets (45-55% crude protein) are essential for carnivorous eels, with feed conversion ratios (FCR) typically ranging from 1.2 to 1.8, and overfeeding must be avoided to prevent water quality deterioration. - Disease prevention hinges on stringent biosecurity protocols, including quarantine, disinfection, and monitoring for bacterial pathogens (*Edwardsiella tarda*, *Aeromonas hydrophila*, *Vibrio* spp.) and viral agents like Anguillid herpesvirus 1, for which rapid LAMP assays exist. - Harvest requires minimizing stress through humane slaughter methods (e.g., electrical stunning) and implementing robust traceability systems, such as genetic authentication via real-time PCR, to ensure food safety and market access. - Economic viability is heavily influenced by the cost of glass eels (30-50%) and feed (20-30%), with RAS energy consumption being a significant operational expense; biofilter capacity must be calculated based on daily feed input, not fish biomass, to prevent ammonia accumulation. --- Eel farming involves the controlled production of Anguilla species, primarily European eel (*Anguilla anguilla*), Japanese eel (*Anguilla japonica*), American eel (*Anguilla rostrata*), and giant mottled eel (*Anguilla marmorata*), from glass eel collection through hatchery propagation, grow-out in recirculating aquaculture systems (RAS), and harvest. This article provides practical guidance for farmers and investors on the key stages of eel aquaculture, including management decisions, system design, water quality control, disease prevention, and harvest methods, based on available scientific and technical evidence. ## At a Glance | Production Stage | Primary Input | Typical Duration | Key Management Focus | |------------------|---------------|------------------|----------------------| | Glass eel collection and acclimation | Wild-caught or hatchery-produced glass eels | 1 to 3 months | Quarantine, weaning onto artificial feed, density control | | Hatchery and larval rearing | Broodstock, hormones for induced maturation | 3 to 6 months | Water quality, live feed production, disease surveillance | | Grow-out in RAS | Juvenile eels (elvers) | 12 to 24 months | Feeding regime, water temperature, oxygen, waste management | | Harvest and processing | Market-size eels (150 to 300 g) | 1 to 2 days | Grading, humane slaughter, traceability | ## Species Selection and Sourcing ### Commercially Relevant Anguilla Species The global eel aquaculture industry relies on several Anguilla species. Japanese eel dominates production in East Asia, while European eel is farmed in Europe and North Africa. American eel and giant mottled eel are also cultured in specific regions. The FAO maintains a cultured species database that includes these species and their production characteristics. Farmers must verify local regulations regarding the capture and trade of glass eels, as several species are subject to conservation measures. The European eel is listed under CITES and requires strict documentation for international trade. An early warning of an upsurge in international trade in the American eel underscores the need for responsible sourcing and trade monitoring. ### Glass Eel Collection and Quarantine Most eel farms begin with wild-caught glass eels, though hatchery-produced stock is becoming more available. Glass eels are collected during seasonal migrations at river mouths and estuaries. Upon arrival at the farm, glass eels must undergo a quarantine period of at least 14 days in a separate system. During quarantine, monitor for signs of stress, disease, and mortality. Disinfection protocols using povidone-iodine have been studied in related eel species for water treatment. Maintain water temperature between 22 and 26 degrees Celsius and salinity at 10 to 15 parts per thousand during acclimation. Record the source, date of collection, and initial weight of each batch. Mortality rates above 10 percent during the first week indicate poor acclimation or disease and require investigation. ### Hatchery Production and Larval Rearing Hatchery production of eels remains technically challenging. Broodstock are typically wild-caught adults that are induced to mature using hormonal treatments. Recent research has focused on egg quality and larval vitality in European eel. Farmers attempting hatchery production must have access to specialized facilities for live feed production, including rotifers and Artemia. Larval rearing requires precise water quality control, with temperature maintained at 18 to 22 degrees Celsius and salinity at 32 to 35 parts per thousand. The transition from live feed to artificial feed is a critical period with high mortality. Record daily survival rates, feed intake, and water parameters. Eel sperm cryopreservation has been studied as a tool for genetic management and hatchery reliability. ## Grow-Out Systems ### [Recirculating Aquaculture System Design](/knowledge/animal-farming/aquaculture/recirculating-aquaculture-system-design-components-sizing) RAS is the preferred system for eel grow-out due to its ability to maintain stable water quality and temperature. A typical RAS for eels includes fish tanks, mechanical filtration, biological filtration, aeration, and temperature control. Tank design should minimize surface area to reduce stress and aggression. Circular or rectangular tanks with a water depth of 0.8 to 1.2 meters are common. The USDA Agricultural Research Service provides resources on aquaculture system design and management. Key design parameters include a water exchange rate of 5 to 10 percent of system volume per day, a biofilter volume of 10 to 20 percent of tank volume, and aeration capacity to maintain dissolved oxygen above 5 mg per liter. Water quality monitoring in eel aquaculture using IoT has been developed to provide real-time data on temperature, pH, dissolved oxygen, and ammonia levels, allowing for rapid response to changes. ### Water Quality Management Eels are sensitive to poor water quality. Maintain ammonia below 0.5 mg per liter, nitrite below 0.1 mg per liter, and nitrate below 100 mg per liter. Temperature should be kept at 24 to 28 degrees Celsius for optimal growth. Dissolved oxygen must remain above 5 mg per liter at all times. pH should be maintained between 6.5 and 8.0. Record water quality parameters at least twice daily and maintain a log for trend analysis. Sudden drops in dissolved oxygen or spikes in ammonia require immediate action, including increasing aeration, reducing feeding, or performing a water exchange. A semi-continuous efficient strategy for removing phosphorus and nitrogen from eel aquaculture wastewater using the self-flocculating microalga Desmodesmus sp. PW1 has been studied as a treatment option. ### Feeding and Nutrition Eels are carnivorous and require high-protein diets. Commercial eel feeds typically contain 45 to 55 percent crude protein and 8 to 15 percent crude lipid. Feed is usually provided as sinking pellets. Feeding frequency varies with size: glass eels are fed 4 to 6 times daily, while larger eels are fed 1 to 2 times daily. Feed conversion ratios (FCR) typically range from 1.2 to 1.8. Overfeeding leads to water quality deterioration and increased waste production. Record daily feed intake, FCR, and growth rates. Adjust feeding rates based on water temperature and fish behavior. When water temperature drops below 20 degrees Celsius, reduce feeding frequency and amount. ### Stocking Density and Growth Stocking density affects growth rate, feed conversion, and disease incidence. For glass eels, start at 1 to 2 kg per cubic meter and increase to 5 to 10 kg per cubic meter as they grow. For grow-out, densities of 20 to 50 kg per cubic meter are common in RAS. Higher densities require more intensive water treatment and aeration. Growth rates vary by species and temperature. Japanese eels can reach market size (150 to 200 g) in 12 to 18 months, while European eels may require 18 to 24 months. Record monthly weight samples from at least 10 percent of the population to track growth. A bioeconomic analysis of commercial giant mottled eel aquaculture in Taiwan provides insights into optimal stocking density and management for improved productivity. ## Disease Prevention and Health Management ### Common Diseases in Eel Aquaculture Bacterial diseases are a major concern in eel farming. Current research on bacterial diseases in eel has focused on an immunological perspective. Common bacterial pathogens include Edwardsiella tarda, Aeromonas hydrophila, and Vibrio species. Viral diseases, such as Anguillid herpesvirus 1, can cause significant mortality. A development of a [loop-mediated isothermal amplification](/knowledge/diagnostics/molecular/lamp-assay-rapid-detection-african-swine-fever-virus-oral-fluids) (LAMP) assay for rapid and visual detection of Anguillid herpesvirus 1 has been reported. This assay can provide results within one hour, allowing for early intervention. Parasitic infections, including gill flukes and skin flukes, are also common. Record all disease observations and treatments. ### Biosecurity Protocols Implement strict biosecurity measures to prevent disease introduction and spread. These include footbaths, hand washing, disinfection of equipment, and quarantine of new stock. Limit visitor access to production areas. Use species-specific equipment and disinfect between batches. The USDA National Agricultural Library provides resources on animal health and welfare in aquaculture. Record all biosecurity measures and any disease outbreaks. If mortality exceeds 2 percent per day for three consecutive days, escalate to a veterinarian. ### Vaccination and Treatment Vaccination is not widely practiced in eel aquaculture, but research is ongoing. Antibiotics should only be used under veterinary supervision and in accordance with withdrawal periods. Probiotics and immunostimulants are sometimes used to improve disease resistance. For parasitic infections, formalin and salt baths are common treatments. Always follow label instructions and withdrawal periods for any treatment. Record all treatments, including dose, duration, and withdrawal period. Do not harvest eels for human consumption until the withdrawal period has elapsed. ## Harvest and Processing ### Harvest Methods Eels are typically harvested when they reach market size, which varies by species and market demand. For Japanese eels, market size is usually 150 to 200 g, while European eels are often harvested at 200 to 300 g. Harvest methods include netting, draining the tank, or using a fish pump. Eels are sensitive to handling stress, so minimize handling time. Record harvest weight, number of fish, and any mortalities. Grade eels by size to meet market specifications. ### Humane Slaughter Humane slaughter methods are important for both welfare and product quality. Common methods include electrical stunning, percussive stunning, or immersion in ice slurry. The FAO Animal Production and Health division provides guidelines on humane slaughter practices. After stunning, eels are typically bled by cutting the gills or tail. Record slaughter method and any welfare observations. Animal welfare issues in capture-based aquaculture have been reviewed, highlighting the importance of minimizing stress during harvest. ### Traceability and Quality Control Traceability is essential for [food safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) and market access. A genetic system for an integral traceability of European eel in aquaculture and seafood products has been developed using fast real-time PCR. This system can authenticate eel products and ensure they are from legal sources. Record all production data, including source of glass eels, feed batch numbers, treatments, and harvest dates. Implement a quality control program that includes sensory evaluation, microbiological testing, and chemical analysis. Maintain records for at least two years after product sale. ## Waste Management and Environmental Impact ### Waste Production and Treatment Eel aquaculture produces waste in the form of uneaten feed, feces, and metabolic waste. In RAS, waste is removed through mechanical filtration and biological treatment. A semi-continuous efficient strategy for removing phosphorus and nitrogen from eel aquaculture wastewater using the self-flocculating microalga Desmodesmus sp. PW1 has been studied. This approach can reduce nutrient levels and produce biomass for biofuel or feed. Record waste production and treatment efficiency. Monitor discharge water quality to comply with environmental regulations. ### Regulatory Compliance Eel aquaculture is subject to environmental regulations regarding water discharge, waste management, and species conservation. The economic impact of the inland water fisheries and aquaculture industry, including the eel industry in Japan, has been studied. Farmers must comply with local, national, and international regulations. Record all regulatory permits and compliance activities. Failure to comply can result in fines, closure, or loss of market access. ## Economic Considerations ### Production Costs Major costs in eel farming include glass eels (30 to 50 percent of total costs), feed (20 to 30 percent), energy (10 to 15 percent), and labor (10 to 15 percent). The cost of glass eels varies by species and availability. Feed costs are influenced by protein content and source. Energy costs are significant in RAS due to pumping, aeration, and temperature control. Record all production costs and compare to industry benchmarks. The bioeconomic analysis of giant mottled eel aquaculture in Taiwan provides insights into cost structures and profitability. ### Market Prices and Demand Eel prices vary by species, size, and market. Japanese eel commands high prices in East Asian markets, while European eel is popular in Europe. Market demand is influenced by cultural preferences, seasonal factors, and supply. Record sales prices and market trends. The economic impact of the eel industry in Japan highlights the importance of sustainable production for long-term market stability. ### Risk Management Eel farming involves risks related to disease, market fluctuations, and regulatory changes. Diversify markets and species to reduce risk. Maintain good records to support insurance claims and regulatory compliance. Develop a contingency plan for disease outbreaks, equipment failure, and market disruptions. An early warning of an upsurge in international trade in the American eel underscores the need for responsible sourcing and trade monitoring. ## Common Failure Patterns ### High Mortality in Glass Eels High mortality in glass eels is often due to poor acclimation, inadequate water quality, or disease. Ensure proper quarantine and weaning protocols. Monitor water quality closely and adjust as needed. Record mortality rates and investigate causes. If mortality exceeds 15 percent during the first two weeks, consult a specialist. ### Slow Growth and Poor Feed Conversion Slow growth and poor FCR can result from suboptimal water temperature, poor feed quality, or high stocking density. Maintain water temperature within the optimal range. Use high-quality feed and adjust feeding rates based on fish behavior. Reduce stocking density if growth is slow. Record monthly growth samples and compare to expected growth curves. ### Disease Outbreaks Disease outbreaks can cause significant mortality and economic loss. Implement strict biosecurity measures and monitor fish health regularly. Use rapid diagnostic tools, such as the LAMP assay for Anguillid herpesvirus 1, for early detection. Record all disease outbreaks and treatments. If mortality exceeds 5 percent in a single day, escalate to a veterinarian immediately. ### Water Quality Deterioration Water quality deterioration can occur due to overfeeding, inadequate filtration, or system failure. Monitor water quality parameters daily and adjust system operation as needed. Maintain backup systems for aeration and pumping. Record all water quality data and system maintenance. If ammonia exceeds 1.0 mg per liter or dissolved oxygen drops below 4 mg per liter, take immediate corrective action. ## Welfare and Safety Context ### Fish Welfare Eel welfare is an important consideration in aquaculture. Animal welfare issues in capture-based aquaculture have been reviewed. Key welfare concerns include handling stress, water quality, and slaughter methods. Minimize handling and provide optimal water quality. Use humane slaughter methods. Record welfare observations and any interventions. Signs of poor welfare include erratic swimming, loss of appetite, and skin lesions. ### Worker Safety Worker safety is critical in eel farming. Hazards include slippery floors, electrical equipment, and chemicals. Provide training on safe work practices. Use personal protective equipment, such as gloves and boots. Record any accidents and near misses. Ensure that all electrical equipment is properly grounded and protected from water exposure. ### [Food Safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) Food safety is essential for market access. Implement a Hazard Analysis and Critical Control Points (HACCP) plan. Monitor for contaminants, such as heavy metals and pesticides. Ensure proper handling and storage of harvested eels. Record all food safety checks. The FAO Animal Production and Health division provides guidelines on food safety in aquaculture. ## Professional Escalation Criteria ### When to Consult a Specialist Consult a veterinarian if you observe unusual mortality, disease symptoms, or poor growth. Consult an aquaculture engineer if you experience system failures or poor water quality. Consult a nutritionist if you have concerns about feed quality or feeding practices. Record all consultations and recommendations. Escalate immediately if mortality exceeds 5 percent in a single day or if a notifiable disease is suspected. ### When to Report to Authorities Report any notifiable diseases to the relevant authorities. Report any regulatory non-compliance. Report any food safety incidents. Record all reports and follow-up actions. The USDA National Agricultural Library provides resources on animal health and welfare reporting requirements. ## Practical Decision Framework for Eel Farm System Selection and Configuration Selecting the appropriate production system configuration requires a structured evaluation of farm resources, target species, and market timelines. This framework provides a step-by-step approach to match system design with operational capacity and production goals, based on available technical evidence from the FAO cultured species database and USDA Agricultural Research Service aquaculture resources. ### Step 1: Assess Resource Availability and Constraints Begin by documenting the following farm-specific parameters before any system design decisions. Record available land area, water source quality and quantity, energy supply reliability, and capital budget. For water sources, test for pH, hardness, alkalinity, and contaminant levels. The FAO Animal Production and Health division provides guidelines on water quality standards for aquaculture. If water pH is below 6.0 or above 8.5, or if hardness exceeds 300 mg per liter as calcium carbonate, consult an aquaculture engineer before proceeding with system design. ### Step 2: Match System Type to Production Scale For farms with less than 500 square meters of tank area and limited capital, a single-pass flow-through system with mechanical filtration may be appropriate. This configuration requires a reliable water source with flow rates of 10 to 20 liters per minute per cubic meter of tank volume. For farms with 500 to 2000 square meters of tank area, a RAS with 5 to 10 percent daily water exchange is recommended. The USDA Agricultural Research Service provides design parameters for RAS components. For farms exceeding 2000 square meters, a multi-unit RAS with independent biofiltration for each unit reduces disease spread risk. Record the chosen system type and justification based on resource assessment. ### Step 3: Determine Species-Specific Temperature and Salinity Requirements Japanese eel requires water temperature of 26 to 30 degrees Celsius for optimal growth, while European eel performs best at 24 to 28 degrees Celsius. American eel tolerates a wider range of 20 to 28 degrees Celsius. Giant mottled eel requires temperatures above 25 degrees Celsius. Salinity requirements also differ: glass eels of all species acclimate best at 10 to 15 parts per thousand, while grow-out can occur in freshwater for Japanese and European eels. American eel and giant mottled eel may benefit from brackish water at 5 to 10 parts per thousand during grow-out. Record target temperature and salinity for the chosen species and verify that the system can maintain these parameters within 1 degree Celsius and 2 parts per thousand respectively. ### Step 4: Calculate Biofilter Capacity Based on Feeding Rate Biofilter size must be calculated from the maximum daily feed input, not from fish biomass. For eel feeds with 45 to 55 percent crude protein, each kilogram of feed produces approximately 30 to 40 grams of total ammonia nitrogen per day. The biofilter must have sufficient surface area to convert this ammonia to nitrate. A moving bed biofilter requires 200 to 300 square meters of surface area per kilogram of daily feed input. A trickling filter requires 100 to 200 square meters per kilogram of daily feed input. Record the calculated biofilter surface area and compare to the installed capacity. If the biofilter surface area is less than the calculated requirement, reduce feeding rates or expand biofilter capacity before stocking. ### Step 5: Establish Monitoring and Response Protocols Implement a water quality monitoring schedule based on system type. For RAS, measure temperature, dissolved oxygen, pH, and ammonia twice daily. Measure nitrite and nitrate weekly. For flow-through systems, measure temperature and dissolved oxygen twice daily, and pH and ammonia weekly. The development of IoT-based water quality monitoring systems for eel aquaculture provides real-time data collection and alert capabilities. Record all measurements in a logbook or digital system. Establish response thresholds: if ammonia exceeds 0.5 mg per liter, reduce feeding by 50 percent and increase water exchange. If dissolved oxygen drops below 5 mg per liter, increase aeration immediately. If pH drops below 6.5, add sodium bicarbonate at 10 to 20 grams per cubic meter of system volume. ### Step 6: Evaluate Economic Feasibility Calculate the break-even price per kilogram of harvested eel based on system type, species, and expected growth rate. Include costs for glass eels, feed, energy, labor, and capital depreciation. The bioeconomic analysis of commercial giant mottled eel aquaculture in Taiwan provides a framework for evaluating profitability under different management scenarios. For RAS, energy costs typically account for 10 to 15 percent of total production costs. For flow-through systems, water pumping costs are lower but water heating costs may be higher in temperate climates. Record the calculated break-even price and compare to current market prices for the target species and size class. If the break-even price exceeds the market price by more than 20 percent, reconsider system configuration or species selection. ### Records and Measurements Maintain a system configuration record that includes tank dimensions, biofilter type and surface area, pump capacity, aeration system specifications, and water exchange rate. Update this record whenever system modifications are made. Record daily water quality parameters, feed input, and any system adjustments. Monthly, calculate the actual biofilter loading rate in grams of ammonia nitrogen per square meter of biofilter surface area per day. Compare this to the design loading rate. If the actual loading rate exceeds the design rate by more than 20 percent for two consecutive months, expand biofilter capacity or reduce stocking density. ### Common Failure Patterns Inadequate biofilter capacity is the most common failure in new RAS installations. Farmers often calculate biofilter size based on fish biomass instead of feed input, leading to ammonia accumulation within 4 to 8 weeks of stocking. If ammonia exceeds 1.0 mg per liter despite increased water exchange, the biofilter is undersized. Another common failure is insufficient aeration capacity during peak summer temperatures. Dissolved oxygen demand increases by approximately 2 percent per degree Celsius above 25 degrees Celsius. If dissolved oxygen drops below 4 mg per liter during warm months, install additional aeration before the next summer season. A third failure pattern is temperature fluctuation exceeding 3 degrees Celsius within 24 hours, which causes feed refusal and stress. If temperature fluctuation exceeds this threshold, improve insulation or increase heater capacity. ### Welfare and Safety Context System configuration directly affects eel welfare. Tanks with sharp corners or rough surfaces cause skin abrasions and increase infection risk. All tank surfaces should be smooth and free of projections. Water velocities above 0.3 meters per second cause forced swimming and energy depletion. Design water inlet and outlet configurations to maintain uniform flow without dead zones or high-velocity areas. The review of animal welfare issues in capture-based aquaculture emphasizes the importance of minimizing environmental stressors during all production stages. Worker safety considerations include electrical grounding of all pumps and heaters, slip-resistant flooring in wet areas, and proper ventilation in enclosed biofilter rooms where carbon dioxide can accumulate. Record any welfare observations or safety incidents and address root causes promptly. ### Professional Escalation Criteria Consult an aquaculture engineer if ammonia remains above 0.5 mg per liter for more than 48 hours despite corrective actions, if dissolved oxygen cannot be maintained above 5 mg per liter with maximum aeration, or if temperature control fails to maintain target range within 2 degrees Celsius. Consult a veterinarian if eels show signs of respiratory distress, such as piping at the water surface, or if feed intake drops by more than 30 percent over three consecutive days. Consult a nutritionist if [feed conversion ratio](/knowledge/animal-farming/poultry/feed-conversion-ratio-measuring-improving-poultry-efficiency) exceeds 2.0 for more than two months or if growth rate falls below 50 percent of expected for the species and temperature. Record all consultations and their recommendations. Escalate immediately if system failure causes mortality exceeding 5 percent in a single day or if water quality parameters reach levels toxic to eels, such as ammonia above 2.0 mg per liter or nitrite above 1.0 mg per liter. ## Frequently Asked Questions ### What species of eel are commonly farmed? Japanese eel, European eel, American eel, and giant mottled eel are the most commonly farmed species. The FAO cultured species database provides information on these and other species. Species selection depends on local regulations, market demand, and environmental conditions. ### How are glass eels collected for aquaculture? Glass eels are collected during seasonal migrations at river mouths and estuaries. They are then transported to farms for quarantine and weaning. Farmers must comply with local regulations regarding glass eel capture and trade. ### What is the typical duration of the grow-out phase? The grow-out phase typically lasts 12 to 24 months, depending on species, water temperature, and feeding regime. Japanese eels grow faster than European eels under similar conditions. ### What are the key water quality parameters for eel farming? Key parameters include temperature (24 to 28 degrees Celsius), dissolved oxygen (above 5 mg per liter), ammonia (below 0.5 mg per liter), nitrite (below 0.1 mg per liter), and pH (6.5 to 8.0). IoT-based monitoring systems can provide real-time data for these parameters. ### How can I prevent disease in my eel farm? Implement strict biosecurity measures, monitor fish health regularly, and use rapid diagnostic tools for early detection. The USDA National Agricultural Library provides resources on animal health and welfare. Quarantine new stock for at least 14 days. ### What is the best method for harvesting eels? Harvest methods include netting, draining the tank, or using a fish pump. Minimize handling stress and use humane slaughter methods such as electrical stunning or percussive stunning. Record harvest weight and any mortalities. ### How can I ensure traceability of my eel products? Use a genetic system for traceability, such as the fast real-time PCR method developed for European eel. Record all production data, including source of glass eels, feed batch numbers, treatments, and harvest dates. Maintain records for at least two years. ### What are the main economic risks in eel farming? Main risks include disease outbreaks, market fluctuations, and regulatory changes. Diversify markets and species, maintain good records, and develop a contingency plan. The economic impact of the eel industry in Japan highlights the importance of sustainable practices for long-term profitability. ## Related Farming Guides - [Recirculating Aquaculture System Basics](/knowledge/animal-farming/aquaculture/recirculating-aquaculture-system-basics) - [Systems Biology](/blog/news/systems-biology) - [Fish Farming Water Feed Stocking Biosecurity Welfare And Harvest Decisions](/knowledge/animal-farming/aquaculture/fish-farming-water-feed-stocking-biosecurity-welfare-and-harvest-decisions) - [Freshwater Prawn Farming Stocking Shelter Feeding And Harvest Management](/knowledge/animal-farming/aquaculture/freshwater-prawn-farming-stocking-shelter-feeding-and-harvest-management) - [Aquaponics Fish Health And System Management](/knowledge/animal-farming/aquaculture/aquaponics-fish-health-and-system-management) ## Related Clinical & Scientific Guides * [Pond Sediment Management and Dredging Options](/knowledge/animal-farming/aquaculture/pond-sediment-management-dredging-options) * [Indoor Aquaculture Facilities: Lighting and Insulation](/knowledge/animal-farming/aquaculture/indoor-aquaculture-facilities-lighting-insulation) * [Greenhouse Aquaculture: Extending Growing Seasons](/knowledge/animal-farming/aquaculture/greenhouse-aquaculture-extending-growing-seasons) ## References and Further Reading - [www.fao.org](https://www.fao.org/fishery/en/culturedspecies) - [www.ars.usda.gov](https://www.ars.usda.gov/animal-production-and-protection/aquaculture) - [FAO Animal Production and Health](https://www.fao.org/animal-production/en). Food and Agriculture Organization of the United Nations. - [Animal Health and Welfare](https://www.nal.usda.gov/animal-health-and-welfare). USDA National Agricultural Library. - [Eel sperm cryopreservation: An overview.](https://pubmed.ncbi.nlm.nih.gov/31155036). Theriogenology, 2019. - [Animal Welfare Issues in Capture-Based Aquaculture.](https://pubmed.ncbi.nlm.nih.gov/33808163). Animals : an open access journal from MDPI, 2021. - [Development of a loop-mediated isothermal amplification (LAMP) assay for rapid and visual detection of Anguillid herpesvirus 1.](https://pubmed.ncbi.nlm.nih.gov/39214419). Journal of virological methods, 2024. - [Disinfection effect of povidone-iodine in aquaculture water of swamp eel (Monopterus albus).](https://pubmed.ncbi.nlm.nih.gov/30519504). PeerJ, 2018. - [A semi-continuous efficient strategy for removing phosphorus and nitrogen from eel aquaculture wastewater using the self-flocculating microalga Desmodesmus sp. PW1.](https://pubmed.ncbi.nlm.nih.gov/37716168). Journal of environmental management, 2023. - [Recent insights into egg quality and larval vitality of the European eel Anguilla anguilla.](https://pubmed.ncbi.nlm.nih.gov/38670468). General and comparative endocrinology, 2024. - [Genetic system for an integral traceability of European eel (Anguilla anguilla) in aquaculture and seafood products: authentication by fast real-time PCR](https://doi.org/10.1007/s00217-015-2514-y). European Food Research and Technology, 2016. - [Water Quality Monitoring in Eel Aquaculture Using IoT](https://doi.org/10.1109/UPCON62832.2024.10983581). 2024 IEEE 11th Uttar Pradesh Section International Conference on Electrical Electronics and Computer Engineering Upcon 2024, 2024. - [The economic impact of the inland water fisheries/aquaculture industry: The case of the eel industry in Japan](https://doi.org/10.1111/rsp3.12323). Regional Science Policy and Practice, 2021. - [Current research on bacterial diseases in eel: An immunological perspective](https://doi.org/10.1016/j.aquaculture.2024.741599). Aquaculture, 2025. - [Improving the management of commercial giant mottled eel Anguilla marmorata aquaculture in Taiwan for improved productivity: a bioeconomic analysis](https://doi.org/10.1007/s12562-015-0934-z). Fisheries Science, 2016. - [Early warning of an upsurge in international trade in the American Eel](https://doi.org/10.1016/j.marpol.2023.105938). Marine Policy, 2024. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.