The western fishery developed countries represented by Norway, the United States, Japan and Canada have accumulated rich experience in deep-water cage culture technology, and their cage has excellent wind, wave and current resistance. The more representative ones are HDPE circular cage of Norwegian AKVA company, Japanese floating rope cage and American dish cage. China’s deep-water cage culture started relatively late. In recent 30 years, China has vigorously developed deep-water cage technology, solved the problems of simple structure, backward equipment and poor anti current ability of deep-water cage, and made a certain breakthrough in resisting typhoons and bad sea conditions.
After long-term exploration, China has not only realized the independent design of deep-water cage, but also the deep-water anti wind and wave cage has reached the world advanced level, and has carried out aquaculture experiments in the sea areas of Shandong, Zhejiang, Guangdong, Hainan and other places. At present, the main deep-sea aquaculture equipment in China can be divided into Submersible Cage, offshore island and reef floating cage, offshore pasture fence, box girder and frame aquaculture platform, semi submersible deep-sea fishing ground, etc., mainly large-scale aquaculture ships and deep-water cage with strong wind and wave resistance. In May 2018, the world’s largest fully Submersible Cage “dark blue 1”, designed by universities and scientific research institutes such as Ocean University of China, was completed in Qingdao, Shandong Province. The cage has a circumference of 180m and 5 aquaculture water bodies × 104m ³， It can cultivate 300000 salmon at a time. In addition, China’s first 10000 ton “Dehai intelligent aquaculture fishery”-“Dehai 1#”, was completed and successfully put into Zhuhai in September 2018. It mainly carried out the breeding test of major varieties in the South China Sea such as large yellow croaker and cobio fish, and the breeding water body reached 3 × 104m ³， It can adapt to the sea environment with a water depth of 20-100m. It is the first 10000 ton deep-sea aquaculture system equipment with complete intellectual property rights in China. It is also the world’s first large-scale fishing ground that has undergone the inspection of level 17 typhoon and ensured safety. In July 2019, fubao-1, the largest abalone breeding platform in the far-reaching sea in China, was officially completed. The platform is equipped with advanced equipment such as wind and solar power generation, water quality monitoring, video monitoring, data wireless transmission, oxygenation device and so on, which is suitable for large-scale aquaculture in the far-reaching sea. In June 2018, CSIC Wuchuan group started the construction of China’s first three super large deep-sea “intelligent fishing grounds” for the South China Sea in Qingdao. China’s deep and open sea aquaculture facilities are gradually developing in the direction of intelligence, large-scale and safety. The technical level of far-reaching marine aquaculture equipment is constantly improving, and the supporting role for the development of deep and open sea aquaculture industry is significantly enhanced.
Among these cage categories, the liftable floating and submersible metal net cage of Haosail machinery integrates a number of advanced technologies and is composed of deep-sea cage frame, metal mesh and lifting device that can dive into the water to form a cylindrical structure. We adopt the combination of lifting suspension cage and platform to ensure that the cage can withstand the impact of typhoon force 12. The characteristic of the cage is that it can dive below a certain depth of the water before a strong typhoon, so as to avoid the impact of wind and waves. The cage adopts new materials such as HDPE, light-weight and high strength alloy materials, and adopts computer control. Various anti-corrosive, anti-fouling (attachments) and anti-aging technologies greatly improve the overall structural strength and flexibility of deep-sea aquaculture cage, and prolong the service life of the cage, greatly reducing the daily maintenance and the cost of aquaculture in unit volume, and improving the economic benefits.
The cage is with stable inside environment,large flow space,and closer to nature; provides fish with wide space of activities, high survival rate, fast growth, less disease, and good healing ability; supplies more natural bait,reduces artificial bait. Cultured fish are close to the wild one in size and meat quality. It expands the breeding capacity, and improves the production efficiency.