Cage culture carp technology details: high-quality culture carp!

Cage culture has the advantages of simple facilities, low investment and high yield, which is widely used in aquaculture, and carp has been very popular since it just came back, so cage culture of carp has been widely accepted and used. Let's take a look at the techniques of raising carp in cages.

I. Culture environment

For the water area used for cage culture of carp, reservoirs, rivers, lakes and ponds with larger water surface can be selected, and the selected water area should meet the conditions such as wide water surface, stable wind and waves, sufficient water source, good water quality and indicators in line with the "Fisheries Water quality Standard". The surrounding environment is quiet and noise-free, and has the traffic conditions for travel. The optimum water temperature for carp growth is 2530 ℃, the water depth in the area where the cage is placed should be more than 4m, and it is suitable for the waters with longer growing period, the dissolved oxygen content in the water area should be above 5mg/L, the transparency should be > 70cm, the water flow is smooth, the flow velocity is 0.1~0.2m/min, and the bottom is flat.

Aquaculture equipment

The cage usually adopts a 5m × 5m × 2.5m hexahedral closed cage with a lid. The mesh aperture is set according to the size of the fish. The cage is made of polyethylene, and there are about 1m live holes on each side of the corner of the lid. In order to release fish species and inspection during production and other operations. Cage placement is mostly buoyant, with appropriate buoyancy and sinking force. In the frame made of steel bar, the upper end of the cage is fixed on the steel bar frame, at the same time, oil barrels are used as floating tools, a simple working channel is set up on the frame with wood, and fixed with Anchorage and pile frame for human walking and bait management.

The distribution of cages should not be too dense, and the position of cages should be moved frequently to avoid excessive local pollution. The arrangement of the cages depends on the production scale. The cages can be arranged in series according to the box spacing of 2: 5m. When there are multiple rows of cages, the row spacing is 5 '10m, and the cages of the two adjacent rows should be arranged at staggered intervals. In order to facilitate manual feeding, two cages can also be separated by 1m to 2m apart to form a pair. Or 4 cages also form a "field" shape according to the box distance of 1: 2m, with each pair (or group) separated by 5m / 10m, which can also be arranged in series. If there are more cages, the distance between row and row should be 50-70m. Artificial baiting in the net needs to be equipped with a bait boat, each of which can manage 4 or 5 cages. The bait feeding machine can also be used to put the bait, and the bait feeding machine can be fed according to the program, which has the advantages of regular and quantitative feeding, which can obviously improve the utilization rate of bait and reduce manual labor. Pellet feed should be used in the feed composition of carp cultured in cage, so the corresponding feed processing unit should be used according to the culture scale, feed demand, production capacity and other conditions to meet the feed needs.

3. Stocking fish species

The healthy large size fish species with the same body color, uniform size, no ulcer, no disease and no damage should be selected for stocking. The size of the fish species should be 100-150 g, and the stocking density should be controlled at 150-200 fish / m2. The stocking of fish species usually takes place in April every year, and the fingerling can be released when the water temperature reaches 12-15 ℃. About 10 days before the fish species into the box, you can first put the cage into the water, the cage will grow a small amount of algae in the water, these algae can reduce the damage in the process of entering the box. When fish fry enter the box, 10~20min can be washed with 20mg/L potassium permanganate solution. The length of disinfection time of fish fingerling should fully consider the factors such as the physical state of fish fingerling, the level of water temperature and the concentration of medicine solution. If abnormal conditions are found in the process of dipping and disinfection of fish fingerlings, they should stop washing and disinfection immediately.

Fourth, feeding

The cage culture of carp is mainly based on artificial bait, and the fish should be domesticated after entering the box, and the predation habit of the fish should be trained by tapping the iron bucket and making sound along the edge of the boat. Domesticate twice a day, once in the morning and once in the afternoon, about 40min each time, and the domestication usually lasts about 10 days. The size of pellet feed should be selected according to different specifications of fish species. The diameter of pellet feed is less than 3mm for carp with a weight of 50 to 200g, and 3~5mm for carp with a weight of more than 200g. Pellet bait should be high-quality full-price bait with comprehensive nutrients, and feeding should strictly abide by the principles of timing, quality and quantity. The specific amount of bait should be set with reference to the weather, water temperature and the eating of fish. In general, the food intake of fish can reach 80%. The feeding times increased with the increase of water temperature. The feeding times increased from 2 times a day when the water temperature was 12 ℃ to 4 times a day when the water temperature was about 20 ℃. When the water temperature was above 25 ℃, the times of daily feeding increased to 5 times. In the later stage, with the decrease of air temperature, the times of daily feeding should be reduced accordingly, and it was appropriate to control it at 3 times per day.