# [Cage Aquaculture](/knowledge/animal-farming/aquaculture/cage-aquaculture-site-selection-mooring-feeding-and-environmental-observation): Environmental Monitoring and Impact Assessment ## Key Takeaways - Systematic monitoring of water quality parameters including dissolved oxygen, temperature, pH, ammonia, nitrite, nitrate, and phosphate is crucial, with weekly sampling at cage perimeters and reference stations recommended to detect trends before fish health declines. - Benthic impact assessment requires biannual sampling for sediment organic carbon, redox potential, macrofauna diversity, and sulfide levels under cages and at increasing distances to identify waste accumulation and ecosystem degradation. - Carrying capacity estimation involves annual assessment using mass balance models that consider feed conversion rate, nitrogen and phosphorus loading, and water exchange rate to adjust stocking density to match site assimilative capacity. - Establishing permanent monitoring stations at multiple distances from cages and at reference sites is essential to capture the spatial extent of farm influence and differentiate farm impacts from natural variability. - Action thresholds for key parameters (e.g., dissolved oxygen < 4 mg/L, unionized ammonia > 0.02 mg/L, sediment redox < -100 mV, macrofauna diversity < 50% of reference) must be defined to trigger immediate corrective management actions such as reducing feeding or relocating cages. - Maintaining comprehensive records of monitoring data, feed usage, and fish health observations is vital for data interpretation, identifying environmental triggers for health issues, and demonstrating responsible stewardship. --- ## At a Glance [Cage aquaculture](/knowledge/animal-farming/aquaculture/cage-aquaculture-site-selection-mooring-feeding-and-environmental-observation) environmental monitoring requires systematic measurement of water quality parameters, benthic sediment conditions, and nutrient loading to assess farm impact and maintain sustainable production. This article provides cage farm managers with practical protocols for benthic impact assessment, water quality monitoring, and carrying capacity estimation based on published research and established monitoring frameworks. | Monitoring Component | Key Parameters Measured | Practical Application | |----------------------|------------------------|----------------------| | Water Quality | Dissolved oxygen, temperature, pH, ammonia, nitrite, nitrate, phosphate | Weekly sampling at cage perimeter and reference station, identify trends before fish health declines | | Benthic Impact | Sediment organic carbon, redox potential, macrofauna diversity, sulfide levels | Biannual sampling under cages and at increasing distances, detect accumulation of waste feed and feces | | Carrying Capacity | Feed conversion rate, nitrogen and phosphorus loading, water exchange rate, current velocity | Annual assessment using mass balance models, adjust stocking density to match site assimilative capacity | ## Scope and Purpose of Environmental Monitoring Cage aquaculture operations release uneaten feed, fish feces, and metabolic wastes directly into the surrounding water body. These inputs alter water chemistry and sediment conditions beneath and around cages. Environmental monitoring provides the data needed to detect early signs of degradation, comply with regulatory requirements, and adjust farm management before impacts become irreversible. The primary intent of this article is to equip cage farm managers with practical monitoring protocols that link directly to management decisions. Environmental monitoring serves three interconnected purposes. First, it protects the farm's own production by maintaining water quality within ranges that support fish health and growth. Second, it demonstrates responsible stewardship to regulators and the surrounding community. Third, it generates the site-specific data needed to estimate carrying capacity and plan sustainable expansion. ## Benthic Impact Assessment ### Sediment Sampling Protocols Benthic impacts from cage aquaculture result from the accumulation of organic matter on the seafloor or lakebed beneath cages. The nitrogen and phosphorus budget in coastal and marine cage aquaculture shows that effluent loading from feed and feces directly affects ecosystem nutrient dynamics (Marine Pollution Bulletin, 2005, https://pubmed.ncbi.nlm.nih.gov/15664033). Regular sediment sampling provides the earliest warning of excessive organic loading. Establish permanent sampling stations along transects radiating from the cage array. Place one station directly beneath the cage center, additional stations at 25 meters, 50 meters, and 100 meters from the cage edge, and a reference station at least 500 meters upcurrent or upstream. Sample sediment using a grab sampler that collects the top 5 to 10 centimeters of undisturbed sediment. Record sediment color, odor, and texture immediately upon collection. Dark black sediment with hydrogen sulfide odor indicates advanced organic enrichment. Send sediment samples to a laboratory for analysis of total organic carbon, total nitrogen, total phosphorus, and redox potential. Redox potential values below -100 millivolts indicate anoxic conditions that can release toxic hydrogen sulfide. The presence of aquaculture-related trace metals in sediments provides additional evidence of farm influence and can be used to rate near-field effects (Marine Pollution Bulletin, 2002, https://pubmed.ncbi.nlm.nih.gov/12523525). ### Macrofauna as Bioindicators Benthic macroinvertebrate communities respond predictably to organic enrichment. Healthy sediments support diverse assemblages of polychaete worms, crustaceans, and bivalves. As organic loading increases, sensitive species disappear and opportunistic species dominate. Collect macrofauna samples by sieving sediment through a 500-micron mesh screen and preserving all retained organisms in 70 percent ethanol. Identify organisms to family or genus level and calculate diversity indices. Compare macrofauna community composition at cage stations to the reference station. A shift from diverse communities to dominance by a few pollution-tolerant species indicates benthic degradation. When macrofauna diversity under cages drops below 50 percent of reference station values, reduce feeding rates or relocate cages to allow sediment recovery. ### Frequency and Timing of Benthic Monitoring Conduct benthic monitoring at least twice per year. Schedule the first sampling at the end of the low-growth season when water temperatures are lowest and oxygen levels are highest. Schedule the second sampling at the end of the high-growth season when feeding rates and waste outputs are highest. This timing captures both baseline conditions and peak impact periods. After major storm events or unusual mortality events, conduct an additional benthic assessment within two weeks. Storm resuspension can redistribute accumulated sediments and temporarily improve conditions, but the underlying organic load remains. ## Water Quality Monitoring ### Critical Parameters for Cage Aquaculture Water quality directly affects fish health, feed conversion efficiency, and disease susceptibility. An in-depth review of critical water analysis parameters for cage aquaculture in Malaysian coastal regions identifies dissolved oxygen, temperature, pH, ammonia, nitrite, nitrate, and phosphate as the most relevant parameters for monitoring and management (Jurnal Kejuruteraan, 2024, https://doi.org/10.17576/jkukm-2024-36%283%29-03). Dissolved oxygen is the most immediate limiting factor. Measure dissolved oxygen at multiple depths within and around cages at dawn, midday, and dusk at least weekly. Dawn measurements capture the daily minimum oxygen concentration. If dawn dissolved oxygen falls below 4 milligrams per liter, reduce feeding rates and increase water exchange if possible. Temperature stratification can trap oxygen-depleted water beneath cages. Measure temperature profiles from surface to bottom at each monitoring station. A temperature difference of more than 2 degrees Celsius per meter of depth indicates strong stratification that can lead to sudden oxygen depletion if the thermocline breaks down. Total ammonia nitrogen and unionized ammonia are toxic to fish even at low concentrations. Measure ammonia weekly at the cage perimeter. If unionized ammonia exceeds 0.02 milligrams per liter, reduce feeding and increase water exchange. Nitrite and nitrate accumulate as ammonia is oxidized and indicate the nitrification capacity of the water body. ### Sampling Locations and Frequency Establish permanent water quality monitoring stations at the cage perimeter, 50 meters downcurrent, 100 meters downcurrent, and at an upcurrent reference station. Sample at each station at the same time of day to allow direct comparison. Collect samples from at least two depths: 1 meter below the surface and 1 meter above the bottom. The relative effects of nutrient emission from intensive cage aquaculture on reservoir water quality demonstrate that nutrient concentrations decrease with distance from cages but remain elevated compared to reference sites (Environmental Monitoring and Assessment, 2015, https://doi.org/10.1007/s10661-015-4925-4). This spatial pattern confirms that cage operations are the source of nutrient enrichment and that monitoring must include both near-field and far-field stations. Sample water quality weekly during the high-growth season and monthly during the low-growth season. After heavy rainfall or during algal blooms, increase sampling frequency to daily until conditions stabilize. ### Real-Time Monitoring Systems Traditional manual sampling and laboratory analysis cannot deliver real-time data for rapid management decisions. Centralized remote monitoring systems for offshore aquaculture cages enable continuous measurement of water quality parameters with data transmission to shore-based control centers (Transactions of the Chinese Society of Agricultural Machinery, 2012, https://doi.org/10.6041/j.issn.1000-1298.2012.06.032). These systems use sensors deployed at cage depth that transmit data via cable or wireless link. Install dissolved oxygen and temperature sensors on at least two cages within the farm. Configure the system to send alerts when dissolved oxygen falls below 4 milligrams per liter or when temperature exceeds the species-specific tolerance range. Review daily minimum and maximum values each morning to detect developing problems. Satellite-based monitoring provides a complementary tool for assessing large-scale cage aquaculture distribution and environmental context. An attention-fused deep learning model using Sentinel-2 satellite data can accurately monitor cage and raft aquaculture at large scale, providing spatial data on farm extent and changes over time (IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2024, https://doi.org/10.1109/JSTARS.2024.3390762). Satellite imagery helps managers understand regional water quality patterns and identify potential pollution sources outside the farm. ## Carrying Capacity Estimation ### Mass Balance Approach Carrying capacity is the maximum fish biomass that a site can support without causing unacceptable environmental degradation. The management of marine cage aquaculture requires an environmental carrying capacity method based on dry feed conversion rate (Environmental Science and Pollution Research International, 2007, https://pubmed.ncbi.nlm.nih.gov/18062477). This approach calculates the nitrogen and phosphorus loading from feed and estimates the water volume and flushing rate needed to dilute and assimilate these wastes. Calculate annual nitrogen loading by multiplying total feed used by the nitrogen content of the feed (typically 6 to 8 percent) and subtracting the nitrogen retained in harvested fish (typically 25 to 30 percent of feed nitrogen). The remaining nitrogen is released to the environment. Phosphorus loading is calculated similarly using feed phosphorus content (typically 1 to 2 percent) and fish retention (typically 15 to 20 percent). Compare calculated loading to the assimilative capacity of the water body. Assimilative capacity depends on water exchange rate, depth, and background nutrient concentrations. Sites with strong currents and deep water have higher assimilative capacity than shallow, low-flow sites. ### Site-Specific Factors Carrying capacity is not a fixed number. It varies with season, water temperature, current patterns, and the cumulative effects of multiple farms in the same water body. The environmental impact assessment of stocking density in bamboo cage aquaculture examines how different stocking densities affect water quality dynamics and stress biomarkers (Environmental Monitoring and Assessment, 2025, https://pubmed.ncbi.nlm.nih.gov/40111523). Higher stocking densities increase waste loading and stress on fish, reducing growth rates and increasing disease susceptibility. Monitor current velocity at the cage site using a current meter deployed at cage depth for at least one full tidal cycle or 24 hours. Calculate the water volume passing through the cage array per hour. If current velocity is consistently below 5 centimeters per second, carrying capacity is severely limited and stocking density must be reduced accordingly. Consider the cumulative impact of multiple farms in the same watershed or coastal embayment. The aquaculture effects on environmental and public welfare in Mediterranean mariculture demonstrate that cumulative nutrient loading from multiple farms can exceed ecosystem assimilative capacity even when individual farms operate within acceptable limits (Chemosphere, 2011, https://pubmed.ncbi.nlm.nih.gov/21821276). Coordinate monitoring with neighboring farms and share data to assess regional carrying capacity. ### Adjusting Stocking Density Based on Monitoring Data Use monitoring data to adjust stocking density annually. If benthic organic carbon under cages increases by more than 20 percent between monitoring events, reduce stocking density by 10 percent for the next production cycle. If water column ammonia concentrations at the cage perimeter exceed 0.1 milligrams per liter total ammonia nitrogen during the high-growth season, reduce feeding rates and consider reducing stocking density. If macrofauna diversity under cages remains below 50 percent of reference station values for two consecutive monitoring events, the site has exceeded its carrying capacity. Relocate cages to a new site or fallow the existing site for at least six months to allow sediment recovery. ## Records and Measurements ### Essential Records for Environmental Monitoring Maintain a permanent record of all environmental monitoring data. For each sampling event, record the date, time, weather conditions, water temperature, dissolved oxygen, pH, ammonia, nitrite, nitrate, phosphate, and Secchi depth at each station. Record sediment characteristics including color, odor, texture, and redox potential. Record macrofauna species counts and diversity indices. Maintain a separate feed record showing daily feed amount, feed type, and feed conversion rate. Calculate monthly feed conversion rate as total feed used divided by fish weight gain. A rising feed conversion rate often indicates deteriorating water quality or increasing stress on fish. Record all fish health observations including unusual behavior, reduced feeding response, external lesions, and mortality. The USDA National Agricultural Library provides resources on animal health and welfare that can guide record-keeping practices (USDA National Agricultural Library, https://www.nal.usda.gov/animal-health-and-welfare). Correlate health events with water quality data to identify environmental triggers. ### Data Interpretation and Thresholds Establish action thresholds for each monitored parameter before the production cycle begins. When monitoring data approach or exceed these thresholds, implement corrective actions immediately. Common action thresholds include: - Dissolved oxygen below 4 milligrams per liter: reduce feeding, increase aeration if available - Unionized ammonia above 0.02 milligrams per liter: reduce feeding, increase water exchange - Sediment redox potential below -100 millivolts: reduce feeding, consider cage relocation - Macrofauna diversity below 50 percent of reference: fallow site or relocate cages Document all corrective actions taken and their outcomes. This record provides evidence of responsible management for regulators and supports continuous improvement of monitoring protocols. ## Common Failure Patterns ### Inadequate Baseline Data Many cage farms begin operations without collecting adequate baseline data on water quality and benthic conditions. Without baseline data, it is impossible to distinguish farm impacts from natural variability. Collect baseline data for at least one full year before stocking the first fish. Sample monthly at proposed cage locations and at reference stations. This investment in pre-operational monitoring pays for itself by preventing regulatory disputes and enabling early detection of problems. ### Insufficient Spatial Coverage Monitoring only at cage perimeters misses impacts that occur at greater distances. Nutrient plumes can extend hundreds of meters downcurrent from cages. Establish monitoring stations at multiple distances along transects to capture the full spatial extent of farm influence. Include stations at distances where impacts are expected to be undetectable to confirm that reference conditions are truly unaffected. ### Ignoring Cumulative Effects Individual farms may operate within acceptable limits while the combined impact of multiple farms degrades the water body. Participate in regional monitoring programs that assess cumulative nutrient loading and ecosystem health. Share data with neighboring farms and regulatory agencies. If regional water quality trends show degradation, advocate for coordinated reductions in stocking density across all farms in the area. ### Failure to Act on Monitoring Data Collecting monitoring data without acting on it wastes time and money. Establish clear decision rules that link monitoring results to management actions. Train farm staff to recognize threshold values and to implement corrective actions without delay. Review monitoring data weekly during the high-growth season and adjust feeding and stocking decisions accordingly. ## Limitations and Professional Escalation ### Limitations of Monitoring Methods Sediment sampling provides a snapshot of conditions at a single point in time. Sediment conditions can change rapidly after storm events or during algal blooms. Supplement periodic sediment sampling with continuous water quality monitoring to capture short-term events that may have long-term impacts. Particle size analysis methods can produce different results depending on the technique used. Reconciling Coulter Counter and laser diffraction particle size analysis for aquaculture monitoring requires careful calibration and method validation (Environmental Monitoring and Assessment, 2024, https://pubmed.ncbi.nlm.nih.gov/38940996). Use the same analytical method consistently to allow comparison of results over time. Satellite-based monitoring provides broad spatial coverage but limited temporal resolution. Cloud cover can prevent image acquisition for weeks at a time. Combine satellite data with in-situ monitoring to fill gaps in the satellite record. ### When to Escalate to Professionals Engage a qualified environmental consultant or university researcher when: - Monitoring data show rapid degradation that exceeds action thresholds despite corrective actions - Benthic conditions under cages become anoxic with visible hydrogen sulfide production - Water quality parameters remain outside acceptable ranges for more than two consecutive weeks - Fish health problems correlate with environmental monitoring data but the cause is unclear - Regulatory agencies require environmental impact assessments beyond routine monitoring - Planning expansion to a new site or increasing stocking density significantly The Food and Agriculture Organization provides resources on sustainable aquaculture practices and environmental management (FAO, https://www.fao.org/fishery/en/culturedspecies). The USDA Agricultural Research Service conducts research on aquaculture production systems and environmental impacts (USDA ARS, https://www.ars.usda.gov/animal-production-and-protection/aquaculture). These organizations can provide guidance on monitoring protocols and interpretation of results. ## Welfare and Safety Context ### Fish Welfare Implications Poor water quality causes physiological stress in fish, reducing growth, feed conversion efficiency, and disease resistance. The environmental impact assessment of stocking density in bamboo cage aquaculture examines stress biomarkers in fish exposed to different stocking densities (Environmental Monitoring and Assessment, 2025, https://pubmed.ncbi.nlm.nih.gov/40111523). Elevated cortisol levels, reduced immune function, and increased disease susceptibility result from chronic exposure to suboptimal water quality. Monitor fish behavior daily. Fish that congregate at the cage surface, show reduced feeding response, or exhibit abnormal swimming patterns may be experiencing environmental stress. Check water quality immediately when behavioral changes are observed. If water quality is within acceptable ranges, investigate other potential stressors including disease, parasites, or predator disturbance. ### Worker Safety During Monitoring Environmental monitoring involves working on or near water in potentially hazardous conditions. Always wear a personal flotation device when working on cages or sampling platforms. Use a boat with a second person present when sampling at stations away from cages. Carry communication equipment and inform shore-based staff of your location and expected return time. Sediment samples may contain hydrogen sulfide, which is toxic at low concentrations. Handle sediment samples in well-ventilated areas and avoid inhaling sediment odors. Wear gloves when handling sediment and wash hands thoroughly after sampling. ### [Food Safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) Considerations Environmental contaminants can accumulate in farmed fish and pose risks to consumers. The presence of aquaculture-related trace metals in sediments and lobsters near cage farms demonstrates that metals can enter the food web (Marine Pollution Bulletin, 2002, https://pubmed.ncbi.nlm.nih.gov/12523525). Monitor metal concentrations in farmed fish tissue if sediment metal levels are elevated. Follow all regulatory requirements for withdrawal periods after any chemical treatments. Maintain records of all treatments and their dates. Do not harvest fish until withdrawal periods have expired and tissue residue testing confirms compliance with [food safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) standards. ## Frequently Asked Questions ### How often should I monitor water quality at my cage farm? Monitor dissolved oxygen, temperature, and pH weekly during the high-growth season and monthly during the low-growth season. Monitor ammonia, nitrite, nitrate, and phosphate at least monthly year-round. Increase monitoring frequency to daily during algal blooms, after heavy rainfall, or when fish show signs of stress. ### What is the most important water quality parameter for cage aquaculture? Dissolved oxygen is the most immediately critical parameter. Low dissolved oxygen causes rapid fish mortality and can occur suddenly, especially during warm weather or at night. Monitor dissolved oxygen at dawn to capture the daily minimum and at dusk to capture the daily maximum. ### How do I establish a benthic monitoring program for my cage farm? Establish permanent sampling stations along transects radiating from the cage array. Place stations directly beneath cages, at 25 meters, 50 meters, and 100 meters from the cage edge, and at a reference station at least 500 meters upcurrent. Sample sediment for organic carbon, redox potential, and macrofauna diversity twice per year. ### What is carrying capacity and how do I estimate it for my site? Carrying capacity is the maximum fish biomass your site can support without causing unacceptable environmental degradation. Estimate carrying capacity using a mass balance approach that calculates nitrogen and phosphorus loading from feed and compares it to the assimilative capacity of the water body based on water exchange rate and depth. ### How do I know if my cage farm is exceeding its carrying capacity? Signs that carrying capacity has been exceeded include rising sediment organic carbon levels, declining macrofauna diversity, elevated ammonia concentrations at the cage perimeter, and deteriorating fish health or growth performance. If macrofauna diversity under cages remains below 50 percent of reference station values for two consecutive monitoring events, the site has exceeded its carrying capacity. ### What should I do if monitoring data show environmental degradation? Implement corrective actions immediately when monitoring data approach or exceed action thresholds. Reduce feeding rates, increase water exchange if possible, and consider reducing stocking density. If degradation continues despite corrective actions, relocate cages to a new site or fallow the existing site for at least six months. ### Can satellite monitoring replace in-situ water quality sampling? Satellite monitoring provides broad spatial coverage but cannot replace in-situ sampling for parameters such as dissolved oxygen, ammonia, and pH that require direct measurement. Use satellite data to assess regional water quality patterns and farm distribution, but continue in-situ monitoring for farm-level management decisions. ### How do I coordinate environmental monitoring with neighboring cage farms? Share monitoring data with neighboring farms and participate in regional monitoring programs. Coordinate sampling schedules and methods to allow direct comparison of results. If regional water quality trends show degradation, work together to reduce cumulative nutrient loading through coordinated reductions in stocking density. ## Related Farming Guides - [Aquaculture Water Quality Monitoring](/knowledge/animal-farming/aquaculture/aquaculture-water-quality-monitoring) - [Aquaculture Solids Management Settling Filtration Sludge And Disposal](/knowledge/animal-farming/aquaculture/aquaculture-solids-management-settling-filtration-sludge-and-disposal) - [Aquaculture Alkalinity Hardness And Ph Management](/knowledge/animal-farming/aquaculture/aquaculture-alkalinity-hardness-and-ph-management) - [Aquaculture Ammonia And Nitrite Management](/knowledge/animal-farming/aquaculture/aquaculture-ammonia-and-nitrite-management) - [Recirculating Aquaculture System Basics](/knowledge/animal-farming/aquaculture/recirculating-aquaculture-system-basics) ## 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. - [Environmental impact assessment of stocking density in bamboo cage aquaculture: examining water quality dynamics, stress biomarkers, and ecosystem response in a subtropical forest water body of Northeast India.](https://pubmed.ncbi.nlm.nih.gov/40111523). Environmental monitoring and assessment, 2025. - [Management of marine cage aquaculture. Environmental carrying capacity method based on dry feed conversion rate.](https://pubmed.ncbi.nlm.nih.gov/18062477). Environmental science and pollution research international, 2007. - [Aquaculture effects on environmental and public welfare - the case of Mediterranean mariculture.](https://pubmed.ncbi.nlm.nih.gov/21821276). Chemosphere, 2011. - [Aquaculture-related trace metals in sediments and lobsters and relevance to environmental monitoring program ratings for near-field effects.](https://pubmed.ncbi.nlm.nih.gov/12523525). Marine pollution bulletin, 2002. - [Reconciling Coulter Counter and laser diffraction particle size analysis for aquaculture monitoring.](https://pubmed.ncbi.nlm.nih.gov/38940996). Environmental monitoring and assessment, 2024. - [Nitrogen and phosphorus budget in coastal and marine cage aquaculture and impacts of effluent loading on ecosystem: review and analysis towards model development.](https://pubmed.ncbi.nlm.nih.gov/15664033). Marine pollution bulletin, 2005. - [An Attention-Fused Deep Learning Model for Accurately Monitoring Cage and Raft Aquaculture at Large-Scale Using Sentinel-2 Data](https://doi.org/10.1109/JSTARS.2024.3390762). IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2024. - [A new proposal architecture for fish feed waste detection in an aquaculture cage](https://doi.org/10.1109/ComNet68251.2025.11325391). International Conference on Communications and Networking, 2025. - [An In-depth Review of the Critical Water Analysis Parameter and Water Quality Management Technology in Cage Aquaculture within Malaysian Coastal Regions](https://doi.org/10.17576/jkukm-2024-36%283%29-03). Jurnal Kejuruteraan, 2024. - [Satellite-based monitoring and statistics for raft and cage aquaculture in China's offshore waters](https://doi.org/10.1016/j.jag.2020.102118). International Journal of Applied Earth Observation and Geoinformation, 2020. - [Centralized remote monitoring system for bred fish in offshore aquaculture cage](https://doi.org/10.6041/j.issn.1000-1298.2012.06.032). Nongye Jixie Xuebao Transactions of the Chinese Society of Agricultural Machinery, 2012. - [Relative effects of nutrient emission from intensive cage aquaculture on the semiarid reservoir water quality](https://doi.org/10.1007/s10661-015-4925-4). Environmental Monitoring and Assessment, 2015. - [Remote sensing monitoring and environmental pollution load assessment of coastal aquaculture area based on GF-2](https://doi.org/10.1109/Agro-Geoinformatics.2019.8820243). 2019 8th International Conference on Agro Geoinformatics Agro Geoinformatics 2019, 2019. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.