According to Binh Dinh Fisheries Sub-Department, in this province, many shrimp farming areas under the extensive farming method, the environment in the cultured water areas is seriously polluted, because the farming area has not been properly planned, which is the main cause of the epidemic. shrimp disease. In fact, the planned shrimp farming areas in Binh Dinh are few, and the spontaneous shrimp farming areas with weak infrastructure are many. The extensive shrimp farming areas do not have a separate water supply system into the pond and a separate wastewater discharge system, most of them only have one pond and then discharge it directly into the environment, leading to infectious pollution. lan. In the context of seriously polluted farming water, causing continuous diseases for shrimp, many whiteleg shrimp farming households in the form of intensive and semi-intensive farming in Phu My district (Binh Dinh) have filtered water before put in ponds. Contamination of culture water is the main cause of disease for shrimp. Photo: Vu Dinh Thung. The filter tank is built of cement bricks with a width of 6m, a width of 4m, and a depth of 2m. Underneath the tank is a layer of coral rock, followed by a layer of activated carbon and a thick layer of sand on top. Water is pumped from the underground circuit into the filter pond and then discharged into the pond with a large plastic pipe. Pump and filter continuously until there is enough water in the pond. After being filtered, the water is clear, when entering the pond, there is little change in algae. Every 3-5 months, shrimp owners have to change the sand and coal layer once. The 1-year coral layer must also be removed, scrubbed clean and then put back in the tank to avoid contamination of the culture water from the scum in the filter tank. The model of using water filter tanks for shrimp farming has been applied by many whiteleg shrimp pond owners in My An commune (Phu My district). Breeding fish in a dual-effective shrimp pond For shrimp farmers in Hoai Nhon town (Binh Dinh), raising mullet in shrimp ponds to help the fish clean the pond environment, both to limit environmental diseases on shrimp, and to earn more income from fish. . According to Mr. La Dong Quang in block 2, Tam Quan ward (Hoai Nhon town, Binh Dinh), one of the three pioneers in raising mullet in shrimp ponds has degraded in the model developed by the Binh Dinh Agricultural Extension Center. deployed with an area of ​​12,000m2, the number of mullet fingerlings stocked is 12,000 with the size of 200 fish/kg. After 8 months of stocking, the results showed that the fish grew well, the survival rate reached nearly 90%, the average weight reached 2-3 fish/kg, the estimated yield was more than 4.8 tons. Mullet has delicious meat, is popular with consumers, so the output is very generous. Mr. Pham Van Chay, a shrimp farmer in Dong Dien hamlet, Phuoc Thang commune (Tuy Phuoc district, Binh Dinh) releases monotypic tilapia into shrimp ponds to clean the pond environment. Photo: Vu Dinh Thung. According to Mr. Do Minh Quang, Deputy Director of Binh Dinh Agricultural Extension Center, farming households must manage environmental factors during the farming process; regularly monitor watercolor, identify environmental factors, monitor environmental factors. Monitor the health and pathology of the mullet fish to take timely measures. The water level in the pond is always maintained above 1.2 m, the amount of water changes from 20-30%/time, the time of water change depends on the level of pollution in the pond. Use aerators and aerators to maintain optimal dissolved oxygen levels in the pond, especially after sunset. In the first time of the farming process, only run the fan in the evening, when the fish are large, depending on the total weight of fish in the pond, adjust the running time of the fan accordingly. The shrimp’s food is always left over at the bottom of the lake, when the aerator runs aeration, the excess food pops up, the mullet fish just like that, so they can take advantage of the fine food source, and the fish will grow faster. Photo: Vu Dinh Thung. “Especially, mullet is omnivorous, the main food is organic detritus. This feature is very beneficial for cleaning degraded shrimp pond environment. In addition, the technique of raising mullet is not difficult, there are few diseases, so the survival rate is high. Breeding mullet interspersed with shrimp at a ratio of 1/4 will bring double profits on the same area, and at the same time reduce the time and cost of fish feed. Because the shrimp’s food is always left over on the bottom of the lake, when the aerator runs on the aerator, the excess food expands, the fish just keep on snapping, so they can take advantage of the refined food source, and the fish will grow faster. Breeding mullet in degraded shrimp ponds has given double results, both cleaning the environment in the pond to ensure safe shrimp growth and creating more income for farmers,” said Mr. La Dong Quang, farmer. mullet in a shrimp pond in Hoai Nhon town shared. In the shrimp farming area in the direction of biosecurity in Dong Dien village, Phuoc Thang commune (Tuy Phuoc district, Binh Dinh), in the shrimp ponds, tilapia can be stocked with the density of 1 fish/2m2 so that they to clean the pond bottom and ensure the water source for farming. “Tilapia not only gradually eat waste at the bottom of the pond to help limit pollution, but the slime layer of the fish also secretes substances with biological effects to kill harmful bacteria of shrimp, balancing the ecology in the pond. Thanks to that, shrimp farming in Dong Dien in recent years has not been harmed by diseases, farmers are profitable,” said Pham Van Chay, who has 4,500m2 of water surface area for whiteleg shrimp farming in Dong Dien village. shall.

Trau tree, also known as oil painting tree, often grows in mountainous areas with moderate slope. Trau is a large tree, up to 8 meters or more high, smooth body, diverse leaves, sometimes with deep lobes, when cut shallow, sometimes whole and heart-shaped, glossy top surface, dark color, underside. translucent, pale color. The flowering season usually starts in April and usually flowers before young leaves appear. By September, there is another flower crop. The fruit of the previous flower will ripen around October. These days, when visiting the Northwest, almost anywhere can be satisfied to see the white Trau forests growing on the hillsides. Hoa Trau is a simple flower with the same root. Each flower has 5 petals, white, purple spots on the nail. Hoa Trau grows in clusters and is quite fragrant. Trau does not require much soil, but where the soil does not have moderate porosity, the soil is not cool and is not good, Trau trees die quickly. In suitable soil, the Trau tree grows very fast, flowers immediately in the 2nd or 3rd year, the branches grow in horizontal and even layers, even after a few years it can grow up to 12 – 15cm. Hoa Trau is also one of many flowers associated with the life of ethnic minorities in the Northwest. The pure and gentle Trau flower bosses give the viewer a relaxed feeling. Currently, Trau’s main use is to use oil presses to blend paint, sweep over the fabric to avoid wet rain, with high export value. Dry Trau is only used as a fertilizer in the field. Also for making medicine. At that time, the Trau kernel will be burned into charcoal, powdered with pig fat to treat impetigo, pimples. Water must not be swallowed. Hoa Trau adorns the Northwest streets … … often adorned the villages in the border areas.

Red-eyed carp are raised by many households in streams, with high economic efficiency. A villager in the commune said that he had an affinity with this fish farming. Once he visited a friend in Sa Pa district, Lao Cai province, he saw that people here raise fish in a stream a lot, with little maintenance costs, and easy to sell. When he returned, from the water in the stream near his house, which flowed all year round, he started to raise fish. He chose the rocky slot and dug 4 fishponds with a total area of ​​up to 5,000 m2. In the midst of a pond, he worked more to bring water from the stream. The fingerlings were bought by him from hatcheries, including simple tilapia, carp, grass carp, etc., so the quality of seeds is always guaranteed. In Sin Thau commune, people raise fish entirely on elephant grass, banana leaves, maize and pureed cassava, without using pellets or industrial bran. Therefore, the quality of commercial fish here always ensures the clean element, firm meat, which is favored by many people inside and outside the region. Some households earn more than 200 million VND a year from fish farming taking advantage of the stream flow. But in Khanh Hoa province, where for many generations of Raglai people, T’rin people only know how to catch stream fish, hunt porcupines, and now there are suddenly fish farms with “nationality” all over Europe and Australia . It is a life-changing story in Son Thai commune, Khanh Phu, Khanh Vinh mountainous district. Going to Da Tay mountain area, beside Se Ooc stream (Son Thai commune), visiting Khanh Vinh cold water fish farm, everyone was excited. Between the four mountains and forests, dozens of large and small aquariums with 6,000m2 of water surface to raise sturgeon, snow grouper look very superficial. According to the farm’s technical manager, the cod grouper is a luxury fish, specializing in cold water living in Australia, but brought here still to live well. This farm also breeds sturgeon. The fish here grew faster than the fish raised in Da Lat. Sturgeon in Da Lat raised from 15 to 18 months to be sold, but here only 12 months, the fish had enough weight to bring to the market. Also in Khanh Phu commune, beside the winding Yang Gang, the fish farm of more than 1 ha is leaning against Treo hill (New hamlet), the scene is also very interesting. The fish farm seems to fall into a valley, far from residential areas, but close to the stream, with an area of ​​10,000m2 of water surface. Starting in 2018, the fish are in good season, grow well and give high income. Currently, each kg of fish sold at the source is more than 200,000 VND, about 10 tons of fish per month for sale. Farmers said that in order to get results today, people have gone through many difficulties. At the time of stocking, everything was favorable, the fish grew quickly. But in the first season, when it was ready to sell (each one from 1.6 kg – 1.7 kg), it suddenly died in mass. The fish farmer was shocked. But if they stop, all enthusiasm is considered to be dissolved into smoke. In the end, we gathered and reworked and then learned from experience, so the following cases all gave good results. Raising fish in streams is the most difficult, unfortunately, when it comes to sudden floods. At that time, it was very difficult to protect the fish from overflowing. Therefore, during the rainy season, fish farmers have to take turns “on duty”, if the rain is heavy and the water rises, they must immediately notify everyone to take care of them. The streams are still the same for thousands of generations, but if you have determination, have capital, learn experience and techniques, fish farming here will bring a great source of income.