With the rapid development of breeding in high-density ponds, the market's demand for catfish has become saturated, and carp prices are also falling. In order to enrich the freshwater
Fish market and mobilize the production enthusiasm of the majority of fish farmers, we now introduce several excellent carp varieties for reference by farmers. Eel carp refers to carp, such as carassius auratus, heterotrophic carp, Pengze carp, silver carp, etc. These carps have the advantages of rapid growth, strong disease resistance, etc., and have a good market in China. Xiang Yunkai (formerly known as the engineering 鲫): This 鲫 is a collaborative group headed by Academician Liu Ji of the Chinese Academy of Engineering. Triploid squid, which has been cultivated using a combination of cell engineering and sexual hybridization engineering, has its own incompleteness. It has the advantages of rapid growth, strong growth, strong disease resistance, wide appetite, easy fishing, low temperature resistance, tender meat, and deliciousness. At the end of the year, the fry can reach 500g. The fish species can be cultivated for one year and the individual can exceed 1000g. 40% to 60% faster than common squid. When the ponds raised fish in an oxygen-depleted pan, grasses and grasshoppers died, but Xiangyunjing was safe. When the water temperature is below 10°C, other fish have ceased to grow, and the cinerea can still grow. Polyculture in ponds can increase production by 1200 to 1440 kg/ha. Increased net profit by more than 1500. Xiangyun grasshoppers can be bred in ponds, mixed breeds, and can also be bred using cages, rice fields, lakes, and reservoirs. Heterologous carp: This eel is a female parent of the Chinese Academy of Sciences Aquatic Institute and a male progeny from Jiangxi Province. After artificial insemination, it has an obvious growth advantage and grows 34.7% faster than its parent. In the second year, it can grow to about 500g. The stocking pond can be stocked with 80 to 120 tails of summer silverfish. The average individual at the end of the year is about 250g. If the adult fish pond is covered with 200 summer flowers, the average value is 200g or more at the end of the year. Peng Zeyi: This is a new breed of freshwater aquaculture that was jointly bred by the Jiujiang City Institute of Science and Technology and the Jiangxi Provincial Institute of Fisheries in Jiangxi Province. It is native to the natural waters of Pengze County in Jiujiang City because of its individual flesh. Tender and delicious, it enjoys a good reputation in the local area. Pengze is an omnivorous fish, with good adaptability, rapid growth, easy reproduction, disease resistance and other good traits, suitable for ponds, lakes, reservoirs, rice fields and other water culture, year-end seedlings up to about 500g. Silver cocoon: The cockroach is native to the Shuangfeng Reservoir in Fangzheng County, Heilongjiang Province, and its growth rate is faster than that of common cod. The largest individual can reach 1.5kg. Currently, cocoon has been transplanted throughout the country, and if it is raised in the fingerling pool Summer 200, the end of the end of the pool up to 400g or so. Silver worms are set in adult fish ponds and can produce 300-600 kg/ha. In order to better understand the differences in growth between Xiangyun pupae and Pengze pupae and heterotrophic carp under the same conditions, we conducted comparative culture experiments on different pools of these three carp species. The test is summarized below. The fastest growth rate of the three kinds of carp was Xiangyun pupae, followed by heterotrophic carp, Pengze pupae were the slowest. They were 21.78% and 70.83% faster than those of hetero-fish and Pengze. Due to its triploid and complete infertility, C. yunnanensis is not affected by gonad development. The nutrients consumed by the fish are completely used for vegetative growth. However, the growth of heterotrophic squid and Pengze scorpion is restricted by sexual maturity: the survival rate from three kinds of squid From the above perspective, the survival rate of Xiangyun Yun is the highest, followed by Peng Zeyu, and the lowest for heterotrophic carp. No drugs were administered during the trial period. Xiang Yunjing and Peng Zexi had strong disease resistance and no death caused by infectious fish disease occurred. In the experiment, the phenomenon of death of the hemorrhagic disease affected the survival rate; from the perspective of the economic benefits of the three species, the carp carp was a complete carp body shape, with large individuals, no development of gonadal organs, less internal organs, and a large proportion of edible parts. Meat tastes delicious and is deeply loved by consumers. The local market price is between 16 and 20 yuan/kg, which is higher than the price of ordinary squid and has higher economic benefits. However, the following issues should be noted in production practice. 1 pond conditions and preparation before stocking 1.1 pond selection pond area should be moderate, should not be too large, the pond area of ​​0.33 to 1 hectare is appropriate, a small pond is conducive to the replacement of water bodies and production management. The depth of water is generally 1.8-2.5m. The pond is rectangular and east-west, and the bottom of the pond is flat. The mud at the bottom of the pond must not exceed 30cm. No leakage, no water in the water source is sufficient, and the groundwater in the deep well is appropriate. Power is guaranteed. Each 6~8 mu pond is equipped with a 3kw impeller type aerator, and there are injection and drainage equipment. 1.2 Preparation before stocking 1.2.1 Fish ponds should be cleaned and disinfected prior to entering the pool. Laotang should excavate excess silt and expose it to dry pools. Clear Pond drugs are mainly lime or chlorine preparations, requiring Quanchiposa, completely kill pathogens and wild fish. 1.2.2 15 to 20 days before stocking, adult fish pond water injection 1 ~ 1.2m. 2 Stocking of fish species 2.1 Stocking time In mid-April, stocking began when the average water temperature reached 6-8°C. Prior to entering the pond, fish fingerlings should be sterilized with drugs such as malachite green or potassium permanganate. 2.2 Select a good species of carp, the purity of the seed should be guaranteed. Stocking species should be pure (preferably the carp is suitable for Pengze Sui), specifications are neat, and the body is robust and free of injuries. Pure varieties of squid can give full play to their advantages of rapid growth, strong disease resistance, etc. The introduction of varieties should go through the local fishery department, and conditions can also be signed directly with the field home. 2.3 Formulate a reasonable stocking mode, and do a good job with varieties. Breeding of common carp generally has intensive culture and nesting. The pond area of ​​intensive carp is preferably about 1 hectare, and 30,000 catfish of 70g/tail can be stocked. With 125g/tail squid 3000 tails. Intensive eel ponds should not be used with other food-eating fish to avoid competing for food and affect the growth of eels. The number of ponds and the size of the area in which the catfish were raised depend on the number of breeding stocks. A total of 180,000 squid 50g/tail were housed in a 2-hectare pond. This will not affect the growth rate of the main cultivar, but also the rational use of water, improve efficiency. 3 Do a good job in the regulation and management of pond water quality 3.1 Spring ponds are used to apply zeolite powder or medical stone once, use one ten-thousandth, use good modifiers every 7 days, and use one-half parts per million, if the pond water quality is transparent Below 20cm, the dosage is 10 to 15 parts per million. 3.2 During the high season of fish growth, the pond is filled and drained twice a month. After pouring and draining, the Sanhe agent and sodium dichloroisocyanurate should be splashed in the pond to achieve the purpose of sterilizing the purified water. 3.3 timely detection of water quality, regular use of photosynthetic bacteria, plankton to the water to provide nutrients, so that the water quality in good condition. During the whole breeding cycle, change the water once every 10 days or so, changing the water depth by 15cm each time. At the same time, adjust the pH of the water with quicklime from time to time to keep it between 7.0 and 7.5, and use it in conjunction with the aerator. The pond maintains good water quality conditions. The aerator was used from July onwards. The principle of use was “opening two and two without openingâ€. It was open at noon on sunny days, opened in the early morning on cloudy days, opened early in floating heads, and remained open on a sunny evening. The rainy days were not open at noon. 3.4 Choosing a full-price compound feed with stable and reliable quality should choose full-price compound feeds produced by large enterprises with good reputation and stable quality. The feed crude protein content of the culture pond was 32%, and gradually adjust its content according to the growth period. The protein content of the feed was not less than 28% and should not be higher than 35%. An excessively high protein content would cause feed nutrient wastage. 3.5 Do a good job of preventing fish diseases in advance, so that the prevention is greater than the treatment before the seedlings lime clear pond, fish into the pond with salt or potassium permanganate solution to soak, kill the bacteria on the fish. Every 20 days or so in the breeding process, chlorine killing spirits, fish and shrimps and other drugs are used to carry out the Quanchiposa to prevent fish diseases. The diseases that endanger the species of salmon are mainly fulminant bacterial septicemia, schizophrenia, sputum hydronephrosis, and epidermal capillary hemorrhage. Among them, "bursting bacterial sepsis" and "epidermal capillary hemorrhage" are the most serious hazards, and these diseases must be prevented in advance. Use a combination of "external elimination and internal medicine". Every month, we must insist on the injection of anti-drug drugs twice. We must do two sterilizations in the first 20 days before the fish market. This will greatly reduce the occurrence of fish diseases.
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