Speckled fork-tailing cage cage technology measures
The spotted tail fins are docile, prefer cluster activities, and are ideally suited for high-density, intensive farming. They are excellent breeds for cage culture.
1. In the water area, the advection area in the midstream of the reservoir is selected, or the river flow area and the lake lagging area are selected. It requires fresh water, no pollution, rich dissolved oxygen, and a transparency of 80 cm or more. The body of water is micro-flowing with a flow rate of less than 0.2 m/s. The depth of water is about 5 meters. During the dry season, the bottom of the cage should also be at least 1 meter above the bottom.
2. Net cages can be set to 5 meters x 5 meters x 2.5 meters in size, and small cages of 1 meter x 1 meter x 1 meter can also be used. The cages are made of polyethylene, preferably double-layered, which helps to prevent escape. The size of the mesh depends on the size of the fish body. Generally, 15 cm or 20 g of fingerlings have a mesh size of 3 cm. When changing the box, the specifications of the meshes are adjusted accordingly. Increasing the mesh size is beneficial to increase the transparent exchange capacity of water bodies. The cages are arranged in rows, and the spacing between adjacent cages in the same row is about 1.5 meters. The upper edge of the open cage should be 0.5 meters above the water surface.
3. The fish stocks need to be kept in specifications, and it is best to stock large-scale fish species. For small size fish species, it can be diluted and cultivated and then quickly diluted. Usually about 15 cm or 20 grams of fish species, after 120 - 150 days of culture, specifications can reach 800 grams or more. The stocking density is 150-200 tails per cubic meter of water, which can be adjusted according to the water quality conditions and the aquaculture management level.
4. The crude protein content of the bait fed on the bait can be more than 30% to meet the normal growth needs of the catfish. To use buoyant bait, it is convenient to feed, but also easy to observe the fish eating and checking the growth of fish. In general, the amount of fish fed is 80% full. Feeding volume should be appropriately increased or decreased with fish growth, water temperature, and weather changes. Daily feeding is performed in two separate sessions, one at 9:00 in the morning and one at 5:00 in the afternoon.
5. Before the breeding and management cages are set up, they should be carefully inspected for any damage or knots. After setting up, check regularly to prevent fish from escaping. Inspection method: Raise the cage around to see if fish escapes or breaks. In addition, ferocious fish attacks should also be avoided to destroy the cage. In the breeding process, the debris in the water body is easily attached to the surface of the cage, and it is easy to grow some filamentous algae, blocking the mesh hole, and affecting the exchange of water. The debris should be promptly removed to clean the mesh and keep the water flowing.
6. Disease prevention actively prevents the occurrence of diseases. Feeding baits often or hanging bags in the cage upstream. Diseases that have already occurred should be dealt with decisively to prevent the outbreak of infection. Medication methods are generally selected for oral administration or medicinal baths. In the medicated bath, the fish is squeezed into a corner of the cage. The fish and the cage are transferred to the inner container containing the liquid medicine. The concentration and the action time of the medicine are well controlled. When the fish body is uncomfortable, the liquid is immediately removed.
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