Grass carp cages should be set up where the water flows, the water is lean, and the water is pure. At present, the efficiency of grass carp breeding is good. In particular, cage grass carp aquaculture brings rich returns to farmers every year. Therefore, how to achieve high yield and high efficiency in cage culture of grass carp is an urgently needed technology for many farmers. Now with the breeding experience to talk about grass carp cage culture technology points:
First, the environmental conditions should be suitable
For grass carp breeding in cages, cages should be set in locations where the leewards are sunny, the water is open, the water is fresh, the sources of water are not polluted, and the traffic is convenient. The daily dissolved oxygen is maintained at 5 mg/l or more, and the pH value is approximately 7.0 to 8.5. 5 to 10 meters, the transparency of the water body is more than 50 cm, and the culture area is not vulnerable to flooding.
Second, the cage settings should be reasonable
Net cages are generally made of polyethylene material, and the size of the cage is preferably 25 to 30 square meters. The four sides of the cage should be fixed on the bamboo frame. The bottom four sides of the cage should be hung with a sinker. The sinker should use stones or woven bagged cement to bind the four corners under the cage. The cage is opened up and down into a square shape. The cage is 30 cm above the water surface. The cages were fixed with cables. The cables straddle the surface of the water. After they were straightened, they were placed on the fixed piles on the shore. The distance between the two cables was 8 meters. After the cages are fixed by cables, the cages shall be installed with the water within 10 days after the fish species are put into the tanks to allow the nets to attach to the algae to make the meshes smooth and prevent the nets from scratching the fish body. The cages can be set in a single box or in groups. Single box set box spacing 25 meters or more. When set by group, every 5 boxes as a group, is a tandem type, take a single row or double row, group box spacing 4 meters, group spacing is about 100 meters, more than 10 meters offshore, in order to prevent the harm of rats, snakes . The arrangement direction of the cages should be perpendicular to the direction of the water flow, which can increase the dissolved oxygen in the water and prevent oxygen deficiency in the grass carp breeding process.
Third, fish stocking should be scientific
Fish stocking should grasp four aspects: First, fish species should be excellent. Fish species are required to have a healthy body, consistent specifications, complete fins, and no disease or injury. Into the box fish species to be healthy, to avoid trauma, the operation is careful, pay attention to prevent human operations caused grass carp injury. The second is that the specifications should be large. The fish species in the box are required to be about 0.25 kg. The large-size fish species have strong disease resistance, high survival rate, and a short breeding cycle, and they can be listed at the end of the year. The third is the right density. In general, cages are stocked with grass carp stocking quantities of approximately 20 fish/m2 to 30 fish/m2, and cages can be stocked in quantities of 200 g/tail to 300 g/tail, with specifications of 100 g. /tail fish. The fourth is to pay attention to methods. Before entering the box, the fish should be bathed and disinfected. Generally, 3% to 5% salt water or potassium permanganate can be used for 15 minutes. Wherever possible, a grass carp hemorrhagic disease vaccine should be injected. The timing of stocking is generally late autumn or early winter. When the water temperature is about 15°C, the stocking is better. At this time, the grass carp can still feed after entering the box. There is a recovery period. After the spring is opened, it can be eaten early to increase the growth time of fish and lay a high yield and high efficiency. basis.
Fourth, feed feeding should be meticulous
When grass carp is cultured in cages, it is generally not suitable to feed grasses in large quantities. Because grassy nutrition is difficult to promote its growth, full-grain pellet feeds should be fed to increase the utilization of feed and reduce the contamination of residual baits on water quality. Grass carp can be fed 2~3 days after entering the box, usually in the morning (9~10 o'clock) and in the afternoon (3~4 o'clock), feeding once before feeding and domesticating before feeding, according to "slow - fast - slow "The rhythm and the "less-more-less" feeding amount, domestication of 1 to 1.5 hours a day, after 10 days of continuous acclimation, when most fish can go up and grab food, they can be fed normally. The daily feeding amount is 3%~5% of the total weight of the fish body, and it is fed 3 times to 4 times per day, and each feeding is about 0.5~1 hour, and the majority of the fish species are full. The amount of each feed should also be properly adjusted according to changes in water temperature, weather changes, fish ingestion and activities. Grass carp grows fastest when the water temperature is between 25°C and 34°C. It should increase the amount of feeding and reduce feeding or stop feeding when it is rainy, hot, thundery and other bad weather.
Fifth, daily management should be strengthened
The daily management of cage grass carp is critical. Mainly do the following aspects:
1. Stick to the inspection box. Should adhere to the daily inspection box, regular inspection of fish growth, reasonable adjustment of feeding, careful observation and analysis, found problems and timely treatment.
2. Diligent in brush box. Wash the cage once every 10 to 15 days, remove the residual bait dirt and algae, so that the water body can be fully exchanged.
3. Check box regularly. Frequently inspect the cages and repair the damaged cages in time to avoid the escape of grass carp or feral fish. In the flood season, it is also necessary to check the strength of the ropes in time, whether the ropes are firm, and whether the nets are deformed.
4. Often tune the box. With the fluctuation of the water level of the reservoir, the cage must be adjusted to a suitable depth and water quality.
Six, fish disease prevention and control should pay attention
First of all, we must adhere to healthy culture, operate according to regulations, prevent disease before they occur. Second, we must do a good job of prevention and do a good job of artificial immunity. At the same time, fish species should be soaked with salt water before they are put into the tank. We must also regularly disinfect and prevent disease. We must administer the baits once every 10 days or so. Each 100 kg of fish should be weighed. 500 grams of allicin plus 200 grams of salt spices were fed and fed for 3 to 5 days to prevent parasites in the fish. Every 10 to 15 days, each cage was splashed with calcined pulp and hot water. To purify water. Use pesticides and bactericides every month. In the hot season, bags can be hung around the cage. Bromochloroin can be used as the drug. Adhere to feeding high-quality feed, do not feed deterioration, expired feed.
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