First, test conditions and methods
1. Pond conditions: The area of ​​special culture ponds is 2.8, the depth of water is 1.8 meters; the area of ​​the polytrophic pool is 1.5 mu and the water depth is 1.5 meters. The source of the water is the Fuchun River water diversion, the water quality is fresh, pollution-free, and the amount of water is sufficient, which meets the standards of GB11607.
2. Disinfection in clear ponds: ponds should be sterilized with quick lime before the stocks are stocked. The amount is 100 kg/mu. Three days later, they are disinfected with bleaching powder of 30 g/m3 to completely kill pathogens.
3. Stocking of fish species: The stocking time was June 17, 2004, of which 2500 were reared in a special raising pond, 893 mu were placed, and the specifications were 50 g/tail. The mixed-culture ponds were mainly cultured white shrimps, and they were conventionally reared. Put seedlings and feeding management, set up 600 species of gem and fish, put 400 mu, specifications 50 g/tail. All fish species were sterilized with 2% saline bath before entering the pool.
4, feeding and management
(1) Feed and feeding: The artificially-prepared buoyant pellet feed is used in a special pool, and the crude protein content is 35%. The daily feeding amount is 2%-5% of the fish body weight, adjusted once every 5 days, and adjusted flexibly according to the weather, water quality and actual food intake, etc. in principle. The polyculture ponds do not feed fish feed separately, according to conventional feeding and management of white shrimp culture in South America.
(2) Routine management: refer to the conventional fish culture in the pond and the production and management measures of Penaeus vannamei, implement pollution-free culture and standardized management.
(3) Disease prevention and control: Adhere to the principle of “prevention based and health managementâ€. Seedlings were bathed with 2% saline for 7-8 minutes prior to stocking. Dibromohydantoin, chlorine dioxide and other drugs were regularly disinfected during the test.
Second, the test results
1. The ponds were reared exclusively: On October 20th, 2004, the results showed that the average size of adult fish reached 450 g per tail, the total output reached 1113.7 kg, the average yield per mu reached 398.8 kg, and the survival rate reached 99.0%.
2. Polyculture of ponds: By October 8th, 2004, the results of the capture of dry ponds have reached an average specification of 600 g per gem, with a total output of 352.8 kg, an average yield of 235.2 kg per mu, and a survival rate of 98%. The captured production of shrimp is 450 kg and the average yield per mu is 300 kg.
Third, summary and experience
1. The results of the test proved that the gem pods have the advantages of rapid growth, high susceptibility to domestication, low oxygen tolerance, and strong adaptability. Although it is similar to the temperature requirements for tilapia, freshwater whitefish, etc., its meat quality, nutritional value, and economic benefits are much higher than those mentioned above. According to the current market price of commercial fish, its aquaculture efficiency is 5-6 times that of tilapia, freshwater whitefish and other fish. Therefore, the market prospects are promising. It is currently a fine variety of freshwater aquaculture species in our city, which is suitable for promotion.
2. The test has achieved significant production economic benefits. According to the test results, the average yield per mu in ponds was 398.8 kg, the per mu value was 2,3928.2 yuan, and the net income per mu was 9571.2 yuan. The South American white prawn ponds were bred with gemstones, with an average yield of 235.2 kg per mu and a mu production value of 1,4112.3 yuan. Without affecting the yield and benefits of South American white shrimp aquaculture, the net increase of revenue per acre was 5644.8 yuan, which achieved the purpose of increasing production and efficiency.
3. When the gems and oyster ponds were raised and tested, it was found that the gems could easily be deprived of oxygen in the monoculture or in the polyculture of shrimp ponds. This is different from the data report and should be noted in the actual breeding process. In addition, gemstones are also very sensitive to trichlorfon, copper sulphate, and ferrous sulphate, so be careful when using drugs to avoid adverse consequences.
4. Through trials, the introduction, domestication, and breeding tests of Australian gemfish have been successful and have yielded good production benefits. However, issues such as breeding of the best stocking specifications and density, carrying out artificial breeding tests, breaking through breeding and breeding, and reducing major production costs such as seedlings need to be further studied.
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