tailieunhanh - Báo cáo nghiên cứu khoa học: "MÔ HÌNH KI NH TẾ-SI NH HỌC ĐỂ CẢI THIỆN HIỆU QUẢ KI NH TẾ-KỸ THUẬT CỦA TRẠI SẢN XUẤT GIỐNG TÔM CÀNG XANH (MACROBRACHIUM ROSENBERGII) Ở ĐỒNG BẰNG SÔNG CỬU LONG"

Tuyển tập các báo cáo nghiên cứu khoa học của trường đại học cần thơ trên tạp chí nghiên cứu khoa học đề tài: MÔ HÌNH KI NH TẾ-SI NH HỌC ĐỂ CẢI THIỆN HIỆU QUẢ KI NH TẾ-KỸ THUẬT CỦA TRẠI SẢN XUẤT GIỐNG TÔM CÀNG XANH (MACROBRACHIUM ROSENBERGII) Ở ĐỒNG BẰNG SÔNG CỬU LONG. | Tạp chí Khoa học 2008 2 143-156 Trường Đại học Cần Thơ MÔ HÌNH KINH TẾ-SINH HỌC ĐỂ CẢI THIỆN HIỆU QUẢ KINH TẾ-KỸ THUẬT CỦA TRẠI SẢN XUAT GIỐNG Tôm càng xanh MACROBRACHIUM ROSENBERGII Ở ĐỒNG BẰng sông Cửu long Lê Xuân Sinh1 ASTRACT Giant freshwater prawn Macrobrachium rosenbergii is one of the most important aquatic species which has high economic value and given the priority for development in the Mekong River Delta. However the supply of postlarvae is one of the most important constraints for further development of this industry. Therefore there is an urgent need to improve the efficiency in hatchery operation of this species on both profit and production as well as quality of postlarvae provide to the grow-out farmers in the delta. This study helps to describe major grow-out systems and the hatchery operation of giant fresh water prawn in the Mekong Delta aiming to build a bio-economic model by applying the Monter-Carlo simulation. This model is a dynamic and stochastic bio-economic model which consists of 4 componets that is bio-technological physics production and economic sub-models. If the set of conditions were applied the optimal and theoritical solutions for an individual hatchery with 20 tanks 1 m3 per tank could help to increase times of postlarvae production and 2 times ofprofit The hatchery could be operated up to 7 production cycles per year each cycle had posetive profit. The yield of postlarvae varied with a lower level in comparion with the profit when each of the initial most important parameters was changed number of tanks size of tanks change of sources offemales delay in the starting day of hatchery operation dry-out time of the hatchery nursing density of nauplii . Limitation of female size about 50g female did not significantly effect to profit and yield g female was the best size . Reduction of 1-2 cycles at the end of operation year could significantly decrease the yield but not profit. Training on the use of this bio-economic .