Net-wide fish farming is a good method of using nets to breed large-scale fish species or cultured commercial fish in suitable waters for large and medium-sized rivers and lakes. Now we will introduce the technology of net-wide fish farming as follows: 1. Seine network construction 1. The position of the seine net should be the bottom of the seine net area to be flat, the bottom material should be harder, and there must be some silt. Net fence area is generally selected in open water areas of lakes or on both sides of lake estuaries, and in gentle river channels. There is a certain submerged plant or benthic animal at the bottom. The water flow is more than 0.05 m/s, but not more than 0.2 m/s, where the water quality is free from pollution. The water depth is below 4 meters and the water level is stable. 2. The shape of the fence design network is preferably circular or elliptical. The net area is 0.2 to 0.6 hectares (3 to 10 mu). The fence structure is usually composed of wall nets, stone dragons, bamboo piles and crossbars. The wall network is usually double-layered, with an interval of 1 to 5 meters between the outer layer and the inner layer (there is a number of fish recovery devices in the middle for observing whether the inner wall network breaks to escape the fish). The mesh can be made of 33 or 34 strands of polyethylene braided mesh. The size of the mesh depends on the species and size of cultured fish. Generally, 2.5 to 3 centimeters is appropriate, and the horizontal shrinkage factor is about 0.65 to 0.70. The height of the wall network is calculated as the sum of the highest water depth and wave height, such as coexisting crabs and other easy-to-climb species and plunging fish, plus 50 to 80 cm of inwardly protruding dumplings at the top of the wall net. Walls should be installed under a certain strength of the rope, usually with a diameter of 5 mm double. The lower end of the wall net is connected to a gabion, and the mesh of the gabion mesh can be smaller. The gabion usually weighs 10 to 12 kilograms per meter, and the iron chain is also used as a base. The principle is to enable the wall nets to enter the mud without being caught by storms or fishes to escape the fish. Bamboo piles and crossbars are used to secure wall mesh and resist wind and waves. The old bamboo with a diameter of 30 centimeters should be selected, and the tip should be driven into the bottom mud. The ankle should be about 1 meter above the high water level, and the bamboo pile spacing should be 1.5 to 3 meters. The place where the water is shallow and the wind and waves are small can be thinner. On the windward side, add 1 support bar every 6 meters. Crossbars are placed at the top and bottom of the pile, about 50 centimeters from the top or bottom. 3. Mesh Installation Mesh Installation Install the piles according to the design requirements. The mesh pieces are cut and spliced ​​as necessary, and the lower seams are made into stone cages to install the gravel. Along the pile under the net, after the next net under the gabion step into the mud 10 to 20 cm, and then the upper and lower classes fixed on the bamboo pile. Second, the stocking of fish 1. Stocking species extensive type of net around the fish, according to the composition of the food within the seine net stocking fish species. In the lakes with low transparency and large plankton biomass, they mainly raise oysters and squid. The abundant water bodies of the estuary can mainly store grass carp, squid, head locusts, and Pengze squid, etc., and can also raise some crabs. The abundance of water, such as benthic snails and maggots, is added to the water and fishes. In order to control some of the miscellaneous fish in the enclosure area, a certain amount of salmon may be properly stocked. In addition, the net surrounding area should also put some yellow alveolar, small scales, etc. to remove the algae attached to the wall. However, it is not appropriate to stock American fish, stingrays, long kisses, etc. These fish are easy to hook onto the mesh and affect the survival rate. 2. Stocking specifications When raising fish species, usually stocking a body weight: grass carp 20 to 25 grams, 10 to 15 grams of head lice, carp 5 grams, herring 100 to 200 grams is appropriate. Farmed fish are required to be raised for one year to reach the market specifications. General stocking is to weigh more than 50 grams, 250 to 300 grams of grass carp, 50 to 100 grams of group head carp, 50 to 60 grams of carp, 20 to 50 grams of carp, carp, carp More than 50 grams of fish can ensure that the mesh is at a better level and is conducive to fish growth. Hours of stocking fish species should also remove ferocious fish. 3. With the proportion of semi-extensive type generally determine the main fish based on food organisms. The main food-eating fish can be eaten with oysters and clams, about 20% to 30%, and quail clams are about 5%. Among them, grass carp and carp are the main species, and grass carp and carp account for 40% to 60%. Eel and squid are about 5% each; Herring is the main species, herring can account for 10% to 20%, and other fish are eaten. The intensive culture type determines the collocation ratio with feed types. 4. Stocking Density The stocking densities vary with different environmental conditions, and the amount of fish stocks is about 10% to 20% of the planned production. In general, the river discharge capacity is 40-150 kg per 667m2 (1 mu), the lake stocking capacity is less than 0.6 hectares, and 100-200 kg per 667m2, and more than 0.6 hectares are about 50 kg per 667m2. The squid and summer fish are about 20 per 667 m2. Mixed crabs of crabs and crabs are sized for 100 birds per kilogram, and 10 kilograms for each 667 meters. Third, feeding and management network around the fish to increase production mainly depends on feeding artificial feed. Feeding feed types can be adapted to local conditions. For example, there are aquatic plants around, and the main grass carp, head lice, river crabs, etc. can be fed with green grass material, and snails and maggots can be fed with sucking snails. Conditional feed can also be used. Feeding requirements "four settings", 1 positioning: to set up a feed station in the area surrounding the stocking density suitable for stocking, grass can be larger, surrounded by a bamboo 10 to 20 meters 2 riprap anchor floating on the surface of the water You can. Submerged food table can be placed under water, such as 1 to 1.5 meters deep, with an area of ​​about 10 meters 2, or select the hard bottom position feeding. 2 Timing: Usually every day in the morning from 8 to 9 o'clock in the afternoon, feeding from 3 to 5 o'clock in the afternoon. When fodder and fine material are mixed and put, the fodder is first cast and then the concentrate is thrown. 3 Qualitative: Feeding rice can be germinated and then fed. Wheat and other water soaked for 5 to 10 hours, plus salt 1% to 2%, snail can be crushed and voted. 4 Quantitative: The amount of feed depends on the amount of fish in the memory, water temperature, and dissolved oxygen. Also related to feed quality. Concentrates (feed ratio 3 or so) daily dosage is about 1.5% to 3% of fish weight, and green feed is about 4% to 20% (about 10% of terrestrial grass, about 20% of aquatic plants). Suitable temperature, high dissolved oxygen, feeding amount should be increased. Frequently remove debris around the screen, keep the water flowing smoothly, and scrub the wall when necessary. Find repairs and damages in a timely manner. Pay attention to check whether the gabion is stranded or not. Underneath it, dig holes to prevent water rat biting. Before and after the flood season and strong winds, special attention must be paid to the inspection of the facilities. Net fishing can be carried out in batches, catching grass carp, head bream, etc. can be used to pull nets, pad nets to catch, squid and squid can be used for tread net fishing, can also be used in the side of the wall net to open the net or fish net cage Fishing, and finally using the pulse of electricity to catch the joint operations to fish.
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