New technology of fish culture abroad

With the rapid development of modern science and technology and aquaculture, the scale of industrial fish culture in many countries is expanding in recent years, and the new culture technology has achieved remarkable results in increasing fish production, reducing energy consumption, saving water and so on. Closed circulation aquaculture technology designed for water saving: water shortage is a major problem facing the world today. in this case, developed countries basically no longer develop the water-consuming fish culture industry, but focus on the development of closed circulation aquaculture equipment to further improve water treatment technology to reduce daily water exchange. On the other hand, the ship-type and platform-type running fish culture equipment produced at sea will also have a certain degree of development in Western Europe and Nordic countries. Pure oxygen technology to increase unit yield: in recent years, some countries such as Denmark and Germany have successfully designed and built aquaculture equipment that uses liquid oxygen to increase oxygen to fish ponds and biofilters, which has greatly increased fish production per unit surface. Countries such as the United States and Sweden have developed pressure oscillation absorption system oxygen production devices, which can directly produce 85%-95% oxygen-enriched oxygen in fish farms, so that pure oxygen enrichment technology can also be used in farms far away from cities. At present, scientists are making great efforts to study the best way to increase oxygen by pure oxygen in order to make this technology popularize rapidly. Water treatment technology to control pollution: the sewage treatment of freshwater fish culture is an important topic in the development of industrial fish culture technology. The biological filter designed by German scientists in the center of the fish pond not only has the effect of heat preservation, but also can reduce energy consumption. It has high practical value and has been paid attention to by many countries. The combined design of this kind of fish pond and filter will have a new development. At the same time, developed countries with advanced industrial fish culture technology will also develop more new types of fish culture sewage treatment equipment with small size, low cost and strong sewage treatment capacity according to their respective water treatment technology characteristics. Low-cost heat pump temperature control technology: temperature control is one of the industrial fish farming; an important link, in the case of daily water exchange of 8% to 10%, the heating cost is a considerable figure. Heat pump is a new type of energy-saving temperature control device, which can save energy by about 50% compared with conventional temperature control devices. It was first used in fish farming in Japan and the United States in the 1980s. With entering the new century, the heat pump manufacturing technology will be more and more advanced, and the cost will gradually decline. Increasingly advanced aquaculture monitoring technology: at present, the more advanced industrial aquaculture equipment have adopted computer-controlled sensing devices to collect and analyze data about water quality, such as oxygen content, pH, water temperature, water level and circulation, etc. and equipped with the corresponding alarm and emergency system. Some farms also use television cameras to scan the water surface to obtain the eating situation of fish, or according to the relevant data, use computers to arrange the best amount of feed, in order to obtain the best conversion rate. In addition, there will also be a breakthrough in the rapid determination of important water quality data, such as ammonia nitrogen content and nitrite content, in order to monitor the water quality more effectively and make industrial fish culture more reliable and stable.