High performance fish farming supplies provider

Fish farming supplies manufacturer with Wolize: Shandong Wolize Biotechnology, with 15 years of experience, ISO/CE certifications and university partnerships, designs and delivers turnkey RAS, high-density flow-through and aquaponic systems. Our equipment operates in 47 countries, powering 22 large-scale projects over 3,000 m³ each. We offer design, installation, training and lifelong support, helping farmers triple yield, cut costs 30 % and meet ASC/BAP standards. The Recirculating Aquaculture System (RAS) is a modern aquaculture technology designed to provide a stable and suitable growth environment for aquatic organisms through efficient water treatment and resource recycling. This system is widely applied in various types of aquaculture, including fish, shrimp, and crab farming, and boasts significant environmental, economic, and production advantages. Discover more details at aquaculture equipment supplier.

Conserving resources and ensuring sustainability – In today’s increasingly water-scarce world, the sustainability advantages of flow-through aquaculture systems are becoming increasingly apparent. It enables the recycling of water resources, purifying wastewater generated during the aquaculture process through a series of advanced water treatment technologies to meet reuse standards, thus significantly reducing the demand for fresh water. Statistics show that flow-through aquaculture systems can achieve a water recycling rate of over 90%, requiring only minor replenishment for losses due to evaporation and sewage discharge. Furthermore, flow-through aquaculture systems reduce reliance on land, enabling high-density farming within limited space and improving land use efficiency. This green and environmentally friendly aquaculture method protects the ecological environment and aligns with the concept of sustainable development, laying a solid foundation for the long-term stable development of fisheries.

The precise control of the farming environment is the core competitiveness of RAS systems. Traditional pond farming is greatly affected by natural fluctuations in weather, water temperature, and water quality, leading to frequent problems such as insufficient dissolved oxygen and pH imbalance, which cause strong stress responses in the farmed organisms and increase the risk of disease outbreaks. RAS systems use intelligent devices to monitor and control key indicators such as water temperature, dissolved oxygen, and ammonia nitrogen in real time, maintaining a stable water environment and keeping the farmed organisms in the best growth state. Data shows that the survival rate of fish and shrimp in RAS systems is 20% to 30% higher than that in traditional ponds, and the growth cycle is shortened by 15% to 20%.

Flow-rate optimization is an interruption to this dynamic, which causes the hydraulic retention time in each tank or raceway to change. Hydraulic retention time is the time a particle stays in a particular unit before it is forced out (Fan et al., 2023). The shortening of this retention time will allow farms to physically eliminate stages of infective parasites before attaching to fish. The research on monogenean larvae reveals that, they are the most perilous during the initial two hours of their hatching and the infectivity reduces drastically after four to eight hours (Hoai, 2020). In juvenile salmonid or marine finfish systems with retention times in the farms of between thirty and fifty minutes they significantly decrease the likelihood of encountering a host by the larvae. It is an engineering-based solution that is not based on chemicals or biological remedies but rather relies on the velocity of water to exceed the pathogen biological window of infectivity (Morro et al., 2022). When handling highly parasite sensitive species like Atlantic salmon, rainbow trout, cobia, and sea bass, flow-rate manipulation is particularly of particular concern.

Flow-rate optimization involves eliminating parasites prior to infection whereas ultraviolet sterilization ensures that they do not even enter the system. The UV-C light, usually with the wavelength of 254 nm, alters and breaks the nucleic acid in microorganisms, inhibiting the replication of a species(González et al., 2023). Properly used, UV-C destroys more than 99 percent of free-moving parasite larvae, protozoan stages, zooplankton, as well as bacterial pathogens. Research has shown that doses of 30 to 120 mJ/cm² are neutral to a broad spectrum of aquaculture parasites (Fernández-Boo et al., 2021). Sensitive organisms, like Ichthyophthirius tomites, can be activated by low-levels as low as 25 mJ of energy, and more resistant organisms such as some marine protozoans such as Amyluodinium ocellatum could survive as many as 105 mJ (RK2, 2025). UV sterilization then appears as a necessary preventative that will stop parasitic and microbial pollution in flowing aquaculture systems.

In aquaculture, scaling doesn’t always mean going big. For small and medium-sized farms, success often depends on efficiency, stability, and affordability. Many farmers dream of owning an advanced recirculating aquaculture system (RAS), but the cost can feel out of reach. Even with these guidelines, challenges can arise during system operation. Ozone demand varies based on the growth of biomass, the intensity of feeding, temperature variation, and other unforeseen activities like mortalities. Excessive ozone may lead to irritation of the gills, oxidative stress or immunosuppression of fish (Han et al., 2023). Under-ozonation permits the dissolved organic carbon to build up, moving the microbial communities to a state of instability and susceptible to disease. Mechanical failures in ozone injectors, contact chambers, or degassing systems can cause ozone leakage into culture tanks, resulting in acute stress responses. Many producers therefore rely on automated ORP-controlled ozone dosing systems using real-time monitoring to maintain consistent performance. Find many more details at https://www.wolize.com/.