In order to develop floating rope cage fish culture industry, here is a brief introduction to the technology of floating fish net cage fish farming. It mainly includes the selection of breeding sites, the setting of cages, the cultivation and feeding of fingerlings, the type of feed and the management of feeding and raising, and the harvesting of products.
First, the choice of farms. First of all, I will introduce the selection of breeding sites for floating fish cages in the offshore. Since the cage of this breeding mode is set in the offshore area outside the harbor, although its structure is a flexible structure with certain wind and wave resistance, it cannot be installed in sea areas with too much wind and waves to create unnecessary Loss and operational inconvenience. For this purpose, the breeding sites are best equipped with certain wind barriers or small wind waves, smooth waters (flow rate of about 1 m/min), no influence from internal bay pollution and fresh water, fresh water quality, relatively stable environment, sandy bottom sediments. , water depth of 12-20 meters in the sea area. Hydrological conditions are: salinity 30-35 ‰, water temperature 18-32 °C, pH 7.5-8.5, transparency 8-15 meters, dissolved oxygen 4.5 mg / liter or more, the water flow rate in the cage is 0.7-0.75 m/min.
Second, the cage system settings and installation. In the selected breeding area of the sea area, first make a mark of the position of the cage and the place where the anchor is anchored (determination of the anchoring position, where the anchor position of the main anchor is more than 4 times the depth of the outer water depth projection of the main cable, and vice anchor Located 3 times deeper than the main cable projection depth). After the signs of the cage and anchor are determined, the cage frame already made can be pulled to the mark location and submerged in water to fix the main anchor (in the end of the main cable facing the storm, three at each end, 250 kg each, 150 kilograms, 150 kilograms; one end of the leeward wave, two at each end, each 100 kilograms). Then use the main mooring line (3-4mm diameter Nylon Rope
) to connect the main anchor with the end of the cage main cable. Using the same method, fix the secondary iron anchors on each side of the cage frame secondary cable (per 50 kg), and then use the auxiliary anchor rope (nylon rope with a diameter of 3 kg) to connect the auxiliary iron anchor with the main and auxiliary cables at the four corners of the frame cage mouth. Finally, tighten the anchor ropes, and then use a 0.5 cm nylon rope to bind the cage to the position of each cage opening in the frame, and bind the side rails and the hanging foot ropes of each cage to the master. The corresponding position of the secondary cable.
Third, the work table equipment. Since the cage system is a flexible structure, it is difficult to stand on seedlings, feeding, sample sampling, product harvesting and other operations and management. For this purpose, four 0.150.15114 (m) high-quality squares are used. Wooden slats and 6 pieces of 0.08-0.100.38 (m) of high-quality wood and 0.50.81.2 (m) foam or 0.8 m in diameter plastic barrels to make a 8.014 (m) The pontoons are placed on top of cage frames for seedlings, daily management and harvesting operations.