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Second, the seedlings choose to choose high-quality, healthy, consistent specifications of the United States red fish, red snapper, black bream seedlings, body length 6-7 cm.
Third, stocking
1. Before clearing the water in the clear pond, dry the pond water for 2 days. Use 100 kg of quick lime to improve the bottom quality and 30 cm of water per mu. Drain it after soaking in the pond for 3 days. Use 30 ppm of bleaching powder after 30 cm of water. Quanchiposa was disinfected; after 2 days, it was sterilized with 5 kg/mu tea; 5 days later, the water was fattened, and the proportion of No. 1 pond water was adjusted to 1.0 08, and the proportion of No. 2 pond water was adjusted to 1.0 13. Sprinkle photosynthetic bacteria 10 ppm 7 days prior to planting.
2. Seed and domesticated seedlings were shipped from March 20, and were treated with 10 ppm copper sulphate and 4 ppm bromochloroheine 4 ppm for 5 minutes. The red snapper, red snapper, and black scorpion were put into the domestication pool on that day. Temporary conservation, desalination, pool water temperature controlled at 23-24 °C, pH value of 8.2, the proportion of pool water 1.0 18, after the fish into the stable water for 3 days. In the future, in the case of insulation, inject a certain amount of fresh water every day, adjust the proportion of pool water, and hold the American redfish pool water according to the specific gravity 1.0 18 (2 days) → 1.0 16 (2 days) → 1.0 14 (3 days) → 1.0 12 ( 3 days) → 1.0 10 (3 days) → 1.0 08 Gradually increase the proportion of seawater to 1.0 08, and increase the proportion of seawater with red snappers and black storks by 1.0 18 (2 days) → 1.0 17 (2 days) → 1.0 16 (2 days) → 1.0 15 (2 days) → 1.0 14 (2 days) → 1.0 13 Gradually increase the specific gravity of seawater to 1.013, then transfer the redfish into pool #1 and place the red snapper and black The quail was transferred to the No. 2 pond. After 3 days of stabilization, 5% or so of fresh water was gradually added each day, and the natural temperature and low salinity adaptive domestication was performed. After 10 days, the proportion of the No. 1 pond water that stocked the American redfish was adjusted to 1.0 03 , After 15 days, the proportion of the No. 2 pond water stocked with red snappers and black sea bream is adjusted to 1.0 09 - 1.0 10, and the pH of the stable two ponds is between 7.8 and 8.4. The stocking density of the No. 1 pond is every 1000 acres, 2 ponds stocking density of 800.
Fourth, develop management
1. Feed Management Feed is mainly based on fresh small trash fish, with a wide source and low price. In the early period, due to the transport of fish, domesticated freshwater, and weak constitution, we must feed enough feed so that the fish can recover quickly and enter the fast growing period. In the middle period of July-September, we need to control the amount of feed, because at this time of high temperature season, although the fish is very busy, if the fish eats too much, it will easily cause diseases such as enteritis; in addition, excessive feeding will cause deterioration and deterioration of water quality. . Feeding enough feed in the later period, because this time is the main fattening period for fish, it is necessary to properly add enough feed, and the feed quality can be relatively poor, but it should be fresh. If the feed is insufficient, it will affect the growth of fish, especially American redfish. Feeding was conducted twice a day, once before sunrise and once after sunset, according to 10%, 6%, and 7% feeding methods in three phases, and 7-80% satiation on a daily basis. When feeding, pay attention to the size and growth of the fish, so that the feed can be adjusted in time and the number of feeds can be increased. The disease status of the fish can be observed to prevent and control the fish.
2. Water quality control The pH should be controlled between 7.8 and 8.4. Change the water every 4 days to 5-8 centimeters. The water quality in the mid-term high temperature period is easy to deteriorate. Change the water 8-10 centimeters every 2 days, depending on the situation. But pay attention to the proportion of stable pool water, and regularly put in zeolite powder to adjust the water quality.
3, prevention and treatment of fish diseases to prevent the main, supplemented by treatment, mainly to do a comprehensive prevention and control work. Two to three days of regular two-day mixing in the bait 1 ‰ -2 强 doxycycline to enhance fish disease resistance. Sprinkle photosynthetic bacteria regularly in the pool to stabilize the advantages of beneficial bacteria, inhibit the growth of the bacteria, and reduce the incidence.
5. Results of the experiment After a total of 7 months of cultivation from April to November, the number of 835 kilograms of American redfish 3006 kilograms produced in the No. 1 pool increased to 700-900 grams and the largest individual was 1123 grams. The survival rate was 94%. A total of 1,785 kilograms of red snapper and black sorghum were harvested. The yield per mu of 495.8 kilograms was increased to 600-800 grams and the survival rate was 90%. The survival rate was significantly higher than that of cage culture and general pond culture of 40%-70%. Water quality is relatively easy to manage and control throughout the entire growing process, and basically no disease occurs; fish growth is rapid and economic benefits are significant, which is a new method for the development of marine aquaculture.
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I. Site Selection In the farms near the sea, 2 shrimp ponds (4,060 meters with an average water depth of 1.5 meters) with easy access to and drainage from the sea, easy access to fresh water are selected. The source of seawater is filtered seawater, and the source of fresh water is well water. , plus six 24-meter domesticated desalination tanks and aeration equipment.