Intelligent Online Water Quality Monitoring Solution for Aquaculture

Aquaculture Intelligent Water Quality Management Solution: Digital IoT Empowers Efficient Ecological Fishery

Industry Pain Points and the Necessity of Online Monitoring

Aquaculture is a high-investment, high-risk industry. Traditional breeding models have long relied on "depending on the weather" and "raising fish by experience". Dramatic changes in the water environment often bring devastating blows to farmers.

Industry Problems

• Nighttime "floating head" and hypoxia-induced fish deaths: Dissolved oxygen is the lifeline of aquaculture. In summer and autumn, affected by air pressure, heavy rain or high temperature, fish ponds are prone to sudden hypoxia in the early morning. Farmers cannot patrol ponds all night, which can easily lead to large-scale fish deaths and pond overturning.

• Hidden water quality toxicity exceeding standards: With the accumulation of residual feed and excrement, toxic substances such as ammonia nitrogen and nitrite at the bottom of fish ponds often exceed standards unknowingly, leading to decreased immunity of aquatic animals and inducing large-scale diseases.

• Large errors and untimely manual measurements: Using traditional reagent kits or portable instruments is not only time-consuming and labor-intensive, but due to measurement lag, it is often too late when water quality deterioration is discovered.

Why is online monitoring needed?

Modern high-density aquaculture has entered the era of "refined water control". Online monitoring can provide uninterrupted dynamic curves of physiological factors, helping farmers accurately grasp the evolution trend of water physicochemical indicators. More importantly, online data can be physically linked with automatic water addition and intelligent aeration equipment, upgrading management methods from "post-rescue" to "pre-protection".

What Problems Can Our System Solve

The intelligent water quality management solution for aquaculture created by YEXsensor builds a 24/7 fishery IoT monitoring network by deploying calibration-free industrial-grade sensors in ponds. The system can not only capture the drop in dissolved oxygen in the middle of the night in seconds and automatically turn on aerators, but also calculate ammonia nitrogen toxicity ratio in real time, send early warnings to mobile phones before water quality imbalance, help farmers completely get rid of the risk of fish deaths, and achieve stable and high yields.

Application Scenarios of Aquaculture Intelligent Online Water Quality Monitoring Solution

This solution is designed for different aquatic ecological needs and is widely applicable to the following breeding models:

• Intensive factory recirculating aquaculture (RAS): In high-density indoor breeding workshops, accurately monitor the water quality microcirculation of each biological filtration unit and breeding tank.

• Outdoor pond refined high-density breeding: Suitable for open-air ponds of high-value species such as four major Chinese carps, Litopenaeus vannamei, Chinese mitten crab, and mandarin fish.

• Cage and enclosure aquaculture: Deployed in reservoirs, lakes or offshore cage areas to control bottom hypoxia and sudden changes in water environment in natural waters in real time.

• Nursery and hatching bases: Provide zero-drift high-frequency water quality monitoring for the extreme sensitivity of juveniles to water quality.

System Composition of Aquaculture Intelligent Online Water Quality Monitoring Solution

The system fully considers the complex and scattered physical environment of outdoor fish farms, adopts low-power and anti-interference design, and is closely composed of the following five parts:

1. On-site Sensing Layer (Water Quality Sensors)

High-performance sensors are directly deployed in the breeding water body, measuring online for a long time and outputting standard digital signals:

• YEX-S1-RDO Dissolved Oxygen Sensor: Adopts optical fluorescence principle, no membrane, no electrolyte, not affected by sulfide interference, no drift after long-term placement.

• YEX-S1-PH pH Sensor: Industrial-grade polymer solid electrolyte electrode, providing stable pH data.

• YEX-S1-NHN NHN-S-Online-Ammonia-Nitrogen-Sensor.html">Ammonia Nitrogen Sensor: Ion selective electrode method, real-time locking of non-ionic ammonia toxicity.

• YEX-S1-EC Salinity/Conductivity Sensor (Supplementary): Provides accurate salinity and TDS basic data for seawater and freshwater aquaculture.

2. Edge Acquisition Layer (Data Collector)

Intelligent IoT acquisition terminal deployed at the pond mouth, integrated with RS485 fieldbus to receive sensor data, and equipped with multi-channel relay output interface, which can be directly interconnected with aerators and feeders.

3. Network Transmission Layer (Wireless Transmission)

• 4G Transmission: In pond mouths with good base station signals, the collector directly sends data to the cloud via 4G network.

• LoRa Networking: For large-scale modern breeding bases with dozens or hundreds of fish ponds, each pond terminal aggregates data to the base center gateway through extremely low-power LoRa local network, and then transmits it uniformly through a single 4G card, greatly saving daily traffic costs.

4. Supporting Energy Layer (Solar Power Supply System)

For areas without mains power coverage or difficult wiring in outdoor ponds, optional 40W/60W monocrystalline silicon solar panels and high-capacity battery packs are provided to achieve all-day self-power supply for the terminals.

5. Application Management Layer (Cloud Platform)

YEXsensor intelligent fishery IoT platform integrates web large-screen terminal and mobile App/WeChat mini-program. In addition to data display, its core is the intelligent linkage engine, which can set aerator start-stop strategies based on dissolved oxygen.

Monitoring Parameters and Working Principles

Parameter Configuration and Technical Indicators

System Operation and Linkage Working Principle

Sensors are automatically awakened by the collector according to the preset cycle (e.g. every 5 minutes). The optical fluorescence DO sensor excites fluorescent substances by modulating blue light and detects the time difference of red light release to calculate dissolved oxygen concentration. Data is transmitted to the data collector through the standard Modbus-RTU communication protocol.

The data collector performs "edge strategy judgment" locally: When the dissolved oxygen in the water body drops below the set safety line (e.g. 4.0 mg/L) at 3 a.m. due to biological respiration, the collector immediately closes the internal hardware relay without waiting for cloud instructions, automatically starting the powerful aerator. It automatically shuts down after dissolved oxygen recovers to a high level (e.g. 6.5 mg/L). All process data and linkage logs are asynchronously synchronized to the cloud platform via 4G/LoRa for farmers to view on their mobile phones.

System Features of Aquaculture Intelligent Online Water Quality Monitoring Solution

• Intelligent aerator linkage energy control: Say goodbye to traditional timers or manual switches. The system accurately adjusts aerator start-stop based on real dissolved oxygen data, avoiding ineffective operation. According to actual measurements, it can reduce breeding electricity costs by 30-40%.

• Fluorescent method long life with minimal maintenance: YEX-S1-RDO sensor breaks through the fate of traditional membrane oxygen electrodes that require frequent membrane replacement and electrolyte addition. The fluorescent cap shell is extremely sturdy, requiring only regular wiping in complex breeding water bodies, with no frequent calibration needed.

• Multi-parameter water quality toxicity linkage warning: The toxicity of ammonia nitrogen to fish is determined by non-ionic ammonia (molecular ammonia). The system cloud can perform real-time thermodynamic matrix cross-calculation combining pH, temperature and total ammonia nitrogen to give accurate "real toxicity alerts" rather than simple single-indicator alarms.

• Multi-channel 24/7 alarm: When indicators are abnormal, the system not only pushes on the App, but also uses high-priority voice calls and SMS to bombard farmers in succession, ensuring timely wake-up even during deep sleep.

System Architecture Diagram of Aquaculture Intelligent Online Water Quality Monitoring Solution

The overall logical topology of this solution is shown below, demonstrating the complete business chain of "water body sensing - intelligent local control - cloud refined management":

Customer Value and Benefits

• Achieve zero pond overturning and zero loss: 24-hour dissolved oxygen "gatekeeper" mechanism completely eliminates malignant accidents of entire pond fish and shrimp deaths caused by nighttime hypoxia.

• Significantly increase breeding density ceiling: Under full closed-loop monitoring and active regulation of water quality, farmers can safely increase feeding volume and per-mu breeding density by more than 30%, directly driving a surge in per-mu output value.

• Scientific medication and feed ratio: Combined with changes in water temperature, salinity and ammonia nitrogen, precisely guide scientific feeding, prevent excessive residual bait from polluting the bottom, reduce medication costs, and shorten the pond exit cycle.

Recommended Product List and Configuration

For standard outdoor high-density breeding ponds, we provide the following highly cost-effective equipment combination:

1. Intelligent fishery pond mouth control box: Industrial-grade waterproof box, built-in 4G communication module, with 2 channels of high-power aerator control AC contactors.

2. High-quality sensor duo: YEX-S1-RDO (optical fluorescent dissolved oxygen, integrated temperature), YEX-S1-PH (long-life pH sensor). For special high-density intensive breeding or seawater-freshwater mixed breeding, it is recommended to add YEX-S1-NHN (ammonia nitrogen) and YEX-S1-EC (conductivity).

3. Independent power supply kit (optional): 60W-100W solar panels and matching brackets, suitable for large-area base outdoor ponds.

Project Cases

Case 1: Intelligent Aeration Upgrade for High-density California Bass Ponds in East China

Project Background: California bass is a high oxygen-consuming species with extremely high breeding density, prone to floating heads in the early morning during summer and autumn.

Deployment Solution: Deployed YEXsensor intelligent IoT collectors and YEX-S1-RDO fluorescent dissolved oxygen sensors for 15 standardized bass ponds to achieve automatic group control of aerators.

Operation Effect: Throughout the entire breeding cycle, aerators were all driven by real dissolved oxygen data. Not only were fish death events completely eliminated, but by avoiding ineffective daytime aeration, the average electricity cost per mu was reduced by 320 yuan, significantly increasing the overall income of farmers.

Case 2: Water Quality Monitoring for a Litopenaeus vannamei Breeding Base in Southern China

Project Background: Shrimp farming is extremely sensitive to pH, ammonia nitrogen and salinity. Slight deterioration of water quality can easily induce stealth death disease.

Deployment Solution: Adopted LoRa hybrid networking mode, deploying multi-parameter sensor groups (DO/pH/ammonia nitrogen/salinity).

Operation Effect: The platform monitored pH day-night fluctuation amplitude and ammonia nitrogen accumulation trends, prompting farmers multiple times to regulate bottom quality and spray probiotics before toxic ammonia surged, increasing the overall shrimp survival rate by 18%.

FAQ

Q1: Fish pond water is usually very dirty with lots of algae and plankton. Will the sensor fail quickly when placed inside?

A: This is indeed the most troublesome problem in aquaculture. Traditional electrochemical sensors are indeed very susceptible to biofilm attachment. In response to this characteristic, our YEX-S2 series sensors can be optionally equipped with maintenance-free automatic mechanical cleaning brushes. The brushes can automatically wipe the fluorescent cap and glass electrode surfaces at set time intervals, effectively solving the problem of algae and silt attachment and ensuring the long-term authenticity and validity of measurement data.

Q2: Why is the optical fluorescence dissolved oxygen sensor (YEX-S1-RDO) better than traditional membrane sensors?

A: Traditional membrane dissolved oxygen sensors consume oxygen in the water during measurement, so they have strict requirements on water flow velocity. Their internal electrolyte and permeable membrane are high-frequency consumables that usually need to be replaced and recalibrated every few months, resulting in huge maintenance workload. The YEXsensor optical fluorescence sensor does not consume oxygen during measurement and is not limited by flow velocity. It measures oxygen concentration by detecting the quenching effect of luminescent substances. There is no electrolyte inside, and the fluorescent cap life can reach more than 1-2 years, basically achieving maintenance-free operation.

Q3: Does the ammonia nitrogen sensor (YEX-S1-NHN) measure total ammonia nitrogen or the molecular ammonia toxic to fish and shrimp?

A: Our sensor hardware directly measures the total ammonia nitrogen ion concentration in the water. However, what is truly fatal to aquatic products is the non-ionized molecular ammonia (NH₃) in the water. The proportion of molecular ammonia increases exponentially with the rise of water pH and temperature. After collecting total ammonia nitrogen data, our intelligent IoT system will automatically call the platform's built-in thermodynamic equilibrium formula, combine the currently measured pH value and temperature at the same time, and automatically calculate the precise concentration of non-ionic ammonia toxic to fish, thereby achieving more scientific toxicity warnings.

Q4: Fish ponds are usually very large. Where should a sensor be placed to represent the water quality of the entire pond?

A: This is a very practical engineering construction issue. Due to the operation of aerators and wind direction, fish pond water has certain fluidity. We usually recommend placing the sensor 3-5 meters from the shore, at a water depth in the middle-lower layer of the water body (usually 0.5 to 1 meter underwater), and try to avoid dead water corners or direct air outlets facing the aerator. The data measured at this position best represents the real living environment of the main activity area of fish and shrimp.

Summary

The intelligent water quality management solution for aquaculture is the core technological link to promote the transformation of traditional agriculture to digital smart agriculture. This solution completely overcomes the drawbacks of traditional aquaculture such as inability to monitor at night, blind indicator changes, and over-reliance on manual experience by introducing high-stability industrial-grade physical sensing hardware and high-dynamic IoT edge control algorithms. Through scientific allocation of aeration energy consumption and precise improvement of water environment, it not only fundamentally eliminates the risk of fish deaths hanging over farmers' heads, but also provides strong digital technology support for promoting green, efficient and intensive modern ecological fishery.

Contact our smart fishery engineers now for a free customized pond layout plan and investment return calculation for your fish pond.