Aquaculture equipment factory by Wolize: Controlling parasites in flowing aquaculture is one of the most long-standing problems of producers of the global community, especially in the systems whose water flow is continuous, i.e., flow-through, semi-recirculating and hybrid RAS aquaculture systems design (Power et al., 2025). This unceasing flow of water is not only vital in oxygenation but also in the removal of waste, which also provides effective routes through which parasites spread to various tanks and production lines. Many parasites possess mobile infective stages adapted specifically to aquatic hydrodynamics, allowing them to exploit water currents as transport mechanisms to reach new hosts (Mouritsen, 2025). As aquaculture becomes increasingly industrialized, the consequences of even moderate parasitic infestations have grown more severe because stocking densities are higher, production schedules are tighter, and biological stress tolerance among cultured species can be easily exceeded (Madsen & Stauffer, 2024). These pressures have made engineering-based parasite control a necessity rather than an optional management strategy. Among the technology-driven solutions available, the combined use of flow-rate optimization and ultraviolet sterilization has emerged as one of the most effective ways to interrupt transmission cycles and stabilize health performance in flowing aquaculture environments (Li et al., 2023).
The enhanced risk resistance provides stable support for farming. Traditional pond farming has weak resistance to natural disasters such as heavy rain and cold waves, and a single extreme weather event can lead to total loss. At the same time, external risks such as water pollution and disease transmission are also difficult to control. RAS systems are mostly indoor or semi-enclosed structures, effectively isolating natural disasters and external pollution. Combined with a complete disease prevention and control system, they significantly reduce farming risks and ensure production stability. In summary, RAS systems solve the problems of resource waste, low efficiency, severe pollution, and high risks in traditional pond farming through their core advantages of water conservation, efficiency, environmental protection, and controllability. They not only align with the sustainable development concept of modern agriculture but also meet the demands of large-scale and standardized industrial development, providing strong support for the high-quality development of the aquaculture industry.
Recirculating aquaculture systems recycle over 95 percent of water contained in culture tanks, mechanical filters and treatment chambers. Although this will decrease the environmental discharge and enhance sustainability, it will also cause the concentration of dissolved organic carbon, suspended solids, mucus, fecal particles, uneaten feed, and diverse microbial communities (MAT, 2025). When such compounds build up beyond the optimum levels, they limit the penetration of light, elevate biochemical oxygen requirements, promote the growth of detrimental bacteria and add stress to the fish. Stress suppresses the immune system, destroys feeding performance, and predisposes Vibrio, Aeromonas, Flavobacterium, parasites, viruses, and other opportunistic pathogens. Because of these reasons, high performance RAS design is focused on effective water treatment mechanisms which can constantly regulate organic load and microbial activity (Fossmark et al., 2020).
Technological stability is also a key concern. Although current flow-through aquaculture technology is relatively mature, it can still be affected by various factors in practical applications, such as equipment failure, sudden changes in water quality, and climate change. Problems with the technical system can lead to a deterioration of the aquaculture environment, hindered fish growth, and even large-scale disease and mortality, causing significant losses to fish farmers. Furthermore, as people’s demands for the quality and safety of aquatic products increase, flow-through aquaculture systems face new challenges in ensuring the quality and safety of aquatic products. Continuous optimization of aquaculture processes, strengthened management of feed and medication use, and improved quality testing and traceability systems are necessary. Find more details at fish farm equipment suppliers China.
Founded in 2009 and headquartered in Shandong, China, Shandong Wolize Biotechnology Co., Ltd. has spent the last 15 years dedicated to the R&D, manufacturing and global deployment of advanced aquaculture equipment and liquid-storage solutions. Backed by strategic partnerships with five leading Chinese universities – including Ocean University of China and Shanghai Ocean University – and certified to ISO 9001, ISO 22000, CE and COA standards, Wolize has delivered projects in 47 countries and regions. To date we have built 22 large-scale facilities, each exceeding 3,000 m³ of water volume, while the fish grown in our systems are now exported to 112 countries worldwide.
A Recirculating Aquaculture System (RAS) is a high-density aquaculture technology conducted in a controlled environment. Its core principle involves continuously recycling water from the culture tanks through a series of physical, biological, and chemical filtration units, requiring only minimal replenishment to compensate for water lost through evaporation and waste discharge. RAS enables precise control over key parameters such as water temperature, dissolved oxygen, pH, and ammonia, thereby freeing aquaculture from the traditional constraints of being reliant on natural conditions. In contrast, traditional aquaculture in Africa is constrained by several major factors: Water Scarcity and Uncertainty: Large parts of Africa are arid and receive low rainfall, with seasonal rivers frequently drying up. Traditional pond aquaculture is highly vulnerable to climate shocks. Land Resource Competition: Fertile, flat land with good water access suitable for constructing ponds is often also prime land competed for by agriculture and human settlement. Environmental Pollution Risk: Wastewater discharge from open culture systems can lead to eutrophication of surrounding water bodies, causing ecological issues. Disease and Pest Infestation: Exchange with external water bodies makes fish stocks highly susceptible to pathogen outbreaks, leading to significant economic losses. Geographical Limitations: Landlocked countries face extremely high costs in developing mariculture, making it difficult to access high-value seafood products.