With the decline of offshore economic fish stocks, fishing production has shown a downward trend, and shallow sea aquaculture has also become saturated. Inspired by storm-resistant deepwater cage culture in Zhejiang, Guangdong and Qingdao, Haixing Fisheries Group Co., Ltd., Rizhao City, Shandong Province In May 2002, the company introduced a group of 5 deep-water cages with a circumference of 50 meters and a depth of 10 meters. After two years of breeding, the company achieved good economic benefits. The relevant technical points and benefits are described as follows: First, the cage settings 1. Selection of the sea area (1) Depth and velocity cages are 10 meters deep, so the low tide level is 14 meters and the flow rate is not more than 1 meter/second. And the water quality is more than 30 cm in the outer area of ​​Rizhao Port. It was observed that at the water flow rate of 0.257 m/s, the cage began to deform, and at a flow rate of 1 m/s, the effective volume of the cage was reduced by 80%. (2) Substrate and environment The sediment of the sea area is mainly made of mud or silt. The cage is fixed by the anchoring method. If the bottom material shows sufficient grip, the cage is more reliable. Considering the destructive power of the typhoon, the cage culture area was set up between Rizhao Port and Kui Shan Kou, in order to reduce the influence of wind. 2. Breeding cages are mainly stocked with four species of black cockroaches, six-line fish, squid and black cockroaches. They were released in May. Excluding the black coops, a small number of six-line fish were reared in the cage, and all other breeds were monocultured. 3. The box material and assembly cages, nets, and steel cables are made of high-strength nylon yarn and high-quality polyethylene materials. The frame is made of high-density polyethylene material; the nets have been treated with antiseptics, meshes 3 cm to 5 cm, no nodules, webs with diameters from 16 cm to 18 cm, a total of nine, distributed evenly along the lateral direction of the box, and longitudinally ligated. In order to withstand the buoyancy of the box, the settlement ring is a large ring made of a permeable tarpaulin wrapped around a wire rope with a diameter of 3 cm and a flexible wire. The lower end of the tying wire is 1 meter away from the bottom edge of the mesh so that the cage can be used. Maintain the vertical shape in water and maintain the effective volume of the tank. However, due to the complexity of cleaning and replacing the cages, after the cages have been used for a period of time, the two cages have been removed and replaced, and 35 kg of dropstones can be replaced by the sill. 4. The sea area where anchoring cages are fixed should be relatively open, and in order to prevent some cables from being concentrated when the tide is high, an anchoring fixed cage with certain mobility is selected. A group of five cages are arranged in the water according to the “one†layout, sharing 16 anchors, anchoring 500 kilograms (including three large iron rings with a diameter of 30 cm), and the main anchoring cable is 3.6 cm in diameter and 270 m in length. The auxiliary anchor cable has a diameter of 3 cm and a length of 110 meters. 5. Installation and replacement of cages (1) Four main anchors for the stay-mesh, two main cables parallel to each other at a distance of 40 meters; 12 secondary anchors, and six secondary cables parallel to the main cable at intervals of 40 meters After the cage is launched into the water, the cage is placed on the frame of the cage. The cage ring is made of eight forks. Each of the two forks is focused on the intersection of the main and auxiliary cables; the lower edge of the cage Set a circle or drop stone about 1.5 meters below. (2) Replace the empty net cages of the nets with the close of the fish net cages. After the two nets are connected, the nets are tied around the seams. The drop stone is added to sink the netting attachments at a height of 1 meter. Generally, they are replaced in order so that they can reach each other. The switch between cages is easy to operate. The fish was driven into the empty box and the replaced net was pulled to the shore to remove attachments. 6. Daily management (1) The feeding of bait is mainly based on low-value mixed fish such as fish, sea mud, etc. Once a day, when the weather is not good, it can be fed every other day. The amount of fish fed is 5% of the weight of the fish in the box. 8%. At least 2 feeds should be fed monthly to avoid the lack of nutrients caused by a single bait and cause disease. (2)Cage Cleaning Nets The underwater attachments of cages are mainly barnacles, juvenile mussels and some fast-growing algae. In order to maintain the water-removing capacity of the cages, they should be cleaned frequently by flushing the net with a high-pressure water gun. The clothing, the net under the replacement of the pull to the shore exposure to remove attachments. II. Benefit Analysis 1. Production Benefits of Different Breeding Breeds The main breeds for stocking are black seabream, squid and black seabream. Each box is filled with 30,000 fry, and the survival rate is 80%. The annual benefit analysis per box is as follows: (1) Black? Black, strong cold, can naturally overwintering in the sea area, easy access to seed, suitable for perennial farming pressure. Each box is reared with 30,000 fry weighing 150 grams, and the output of the box is 12,000 kilograms. The selling price is 20 yuan/kg, and the output value is 240,000 yuan, after deducting the cost of 205,000 yuan, the benefit is 34,000 yuan. (2) In May, squid released 30,000 fry weighing more than 100 grams in December. It went out of the box in December, output was 12,000 kilograms, the selling price was 36 yuan/kg, and the output value was 312,000 yuan. After deducting the cost of 265,000 yuan, the benefit was 47,000 yuan. . (3) Black Stork released 30,000 fry weighing 150 grams in May and came out of the box in December. The output was 12,000 kilograms. The selling price was 36 yuan/kilogram. The output value was 432,000 yuan, after deducting the cost of 355,000 yuan, the gain was 77,000 yuan. yuan. 2. Estimated Production Costs (1) Net cage fees The net cages produced in Qingdao and the nets produced in Shantou, Guangdong Province are used. The total installation fee is 80,000 yuan, and depreciation is 4 years. The average annual consumption expense is 20,000 yuan. (2) Fry fees Each box of 50 tons of fish fry rearing weight of more than 30,000, about 2.5 yuan / tail ~ 7 yuan / tail (including the maintenance), a total of 75,000 yuan to 210,000 yuan range. (3) Feeding during bait fee cultivation is mainly based on low-value fish and shrimp, supplemented by synthetic feed. The feed coefficient is 7, total feeding 84,000 kilograms, the price of 1.6 yuan / kg, the cost of 143,400 yuan. (4) Depreciation of transportation vessels The value of a 10 horsepower fishing vessel worth 10,000 yuan and the annual depreciation of 0.02 million yuan per cage. (5) Depreciation of the Guard Ship The entire surface of the water is equipped with a fishing boat of 60 hp to 80 hp with a ship value of 150,000 yuan. It is depreciated for 10 years and the annual rate is 0.075 million yuan per carton. (6) Labor costs The cage is managed by 5 people. The average annual salary is 10,000 yuan, a total of 50,000 yuan. (7) The oil fee for boats and vehicles is 10,000 yuan per cage. Deep-water cages stocked with different fry, the annual output value, the cost is different, the benefit also has the difference, in these 3 kinds of breeds, the breeding black cocoon benefit is best, but due to the black cockroach low temperature ability is poor, has the certain risk, but other two Variety is still more suitable for breeding in windbreak cages.
Better Medical Technology Co., Ltd. , http://www.fshospitalbed.com