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ผลงานตีพิมพ์ในวารสารวิชาการRisk factors associated with acute hepatopancreatic necrosis disease at shrimp farm level in Bac Lieu Province, Vietnamผู้แต่ง: Hien The Nguyen, Toan Nguyen Van, Tien Tien Ngoc,  Dr.Visanu Boonyawiwat, Associate Professor , Dr.Theera Rukkwamsuk, Associate Professor , Mr.Adisorn Yawongsa, Associate Professor , วารสาร:  
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Applications of Paddle Wheel Aerators and Diffused-Air System in Closed Cycle Shrimp Farm System) ผู้เขียน:ดร.วราห์ เทพาหุดี, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractShrimp culture practices are changing from high water exchange systems to low water exchange systems to reduce the risk of disease contamination and water pollution. The low water exchange systems require a great number of aerators to prevent water deterioration due to high organic loading associated with limited water exchange. However, high rates of aeration can not only cause excessive water currents and erode pond bottom badly but also increase power cost. In this present study, applications of paddle wheel aerators and diffused-air systems were investigated in grow-out ponds of a closed cycle farm. The results showed that these systems were successful used in shrimp production, and of the systems examined, a combination of paddle wheel and medium bubble size diffused-air system, with a polyethylene pipe network proved to be most effective and convenient. This aeration system provided suitable dissolved oxygen concentrations to the water body and the pond bottom, which could stimulate decomposition at the pond bottom. In addition, this system had low operating costs. It is suitable to be applied in low water exchange culture systems and it can also reduce problems of pond bottom erosion, a typical problem, when using large numbers of paddlewheels. |
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ที่มา:KASETSART UNIVERSITY FISHERIES RESEARCH BULLETINหัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Nutrient Budget and feasibility of Closed Cycle Shrimp Farm Systems) ผู้เขียน:ดร.วราห์ เทพาหุดี, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA closed cycle shrimp (Penaeus monodon) farm was conducted for two consecutive crops. This system comprised of two grow-out ponds, one reservoir and one sediment pond. The reservoir was used for water storage and treatment. Average total production was 3,755 kg ha-1 for the first crop and 5,25-3 kg ha-1 for the second. Feed was the major source of nutrient to grow-out ponds, contributing an average 361 kg ha-1 of N (85.8% of TN) and 69 kg ha"1 of P (51.5% of TP) for the first crop compared with 485 kg ha1 of N (82.3% of TN) and 92 kg ha"1 of P (50.8% of TP) for the second crop. Major losses were accumulation in the sediment accounting for 30% of TN and 88% of TP outputs. This system results demonstrated the feasibility of the system in culturing shrimp for at least two consecutive crops with no effect on shrimp production and water quality. The system could obtain high feeding efficiency, and low water exchange was used per production. The production was also reasonable. However, increased levels of nutrients and sediment in the reservoir may create problems in the subsequent crops. This needs to be further studied regarding the effects of the long term accumulation on the shrimp production. |
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ที่มา:การประชุมวิชาการระดับชาติ มหาวิทยาลัยราชภัฏพระนคร ครั้งที่ 3หัวเรื่อง:ขนาดที่เหมาะสมของแมงกานีสซีโอไลต์ชนิดเม็ดเพื่อการกำจัดแอมโมเนียไนโตรเจนจากน้ำเสียฟาร์มเลี้ยงกุ้งในแบบจำลองคลองวนเวียน |
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ที่มา:ASIAN PACIFIC AQUACULTURE 2009หัวเรื่อง:แนวทางการใช้สาหร่ายไส้ไก่จากฟาร์มเลี้ยงกุ้งสำหรับเป็นอาหาร |
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