White leg shrimp farming in freshwater area is a spontaneous production activity however that has developed strongly in Long An Province in recent. This study was carried out by surveying 30 shrimp farmers in two freshwater districts of Long An Province including Tan Thanh and Moc Hoa. The result showed that themain technical criteria of shrimp farming were recorded including 0.28 ha of culture pond area, 1.6 m of water level depth, 2.7o=oo of salinity, 88 mg.L-1 of alkalinity, 143 individual.m-2 of stocking density, 86.9 days of culture time, 78.8% of survival rate, 24.7 tons.ha-1.crop-1 of yield and 1.25 of FCR. Regarding the financial status, the total investment cost and profit of shrimp farming were 2,120.8 millions VND/ha/crop and 1,079.6millions VND/ha/crop, respectively. The result of regression analysis showed that the factors including pond area, survival rate of shrimp and FCR were the major factors which had a significant impact on farming productivity. Meanwhile the shrimp farming profit was strongly influenced by 5 main factors including labor cost, feed cost, drug cost, pond renewed cost and shrimp farming productivity.
This study focused on water quality assessment of farmed shrimp ponds in Binh Dai District, Ben Tre Province. The goals of the study were to provide chemical parameters of pond water for farmers, to identify problems and causes in farmed shrimp related to water quality and disease, and to help managers find appropriatesolutions to minimize damage to local shrimp farming. Water samples were collected monthly from January to June 2021 from 90 vannamei farmers in six different areas, including Vang Quoi Dong, Dinh Trung Binh Thoi, Phu Long, Phu Vang, and Binh Thang of Binh Dai District. Parameters investigated in this study included pH,alkalinity, NH4+, NH3, NO2- and three other minerals. Water quality parameters were analyzed based on APHA standard analysis methods. The results showed that the water quality of shrimp farming areas in Binh Dai fluctuated from time to time, and water quality parameters were suitable for vannamei shrimp farming. However, the concentration of NO2- was always higher than the permitted threshold. The results fromcluster analysis and MANOVA testing showed that water quality of the shrimp farming areas in Binh Dai was significantly different (p < 0.05), especially NO2-, Ca, Mg and alkalinity. These findings suggest that farmers must apply proper solutions for water quality management in each farming area to maximize crop production.
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