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BÁO CÁO " NGHIÊN CỨU KHẢ NĂNG SỬ DỤNG OZONE TRONG ƯƠNG ẤU TRÙNG TÔM SÚ (Penaeus monodon) "

Tạp chí Khoa học 2008 (2): 133-142 Trường Đại học Cần Thơ Nguyễn Lê Hoàng Yến1 Đề tài được thực hiện với 2 thí nghiệm nhằm khảo sát sự ảnh hưởng của Ozone đến chất lượng nước ương nuôi ấu trùng tôm Sú từ Nauplii đến PL15 . Thí nghiệm 1 gồm 3 nghiệm thức nhằm so sánh tác dụng của nước được xử lý bằng Ozone và Chlorine trong ương ấu trùng từ Nauplii lên PL1 . Kết quả nghiệm thức sử dụng nước xử lý bằng ozone kết hợp sục ozone vào bể 1lần/ ngày (nồng độ ozone thay đổi. | Tạp chí Khoa học 2008 2 133-142 Trường Đại học Cần Thơ NGHIÊN CỨU KHẢ NĂNG SỬ DỤNG OZONE TRONG ƯƠNG ẤU TRÙNG TÔM SÚ Penaeus monodon Nguyễn Lê Hoàng Yến1 ABSTRACT The effect of ozone on water quality in aquaculture was set up by two experiments. The first experiment was done to compare the effects of using ozone and chlorine on water quality and survival rate of postlarvae with 3 treatments i Water was treated by chlorine Control treatment ii Water was treated by ozone at 0.35mg L iii Water was treated by ozone 0.35 mg L and ozone was dissolved daily in rearing tank at the concentration of 0.27 mg L. The results showed that NOf was lowest 0 011mg L in the treatment 3 while survivalPL1 could reach up to 81.4 . Our findings suggested that ozone can replace chlorine to treat water in shrimp hatcheries. The second experiment combined between the re-circulating water system and ozone in protein-skimer for rearing PL1 to PL15.The experiment comprised of 4 treatments i Water was treated by chlorine Control treatment ii Water was treated by ozone at 0.35mg L iii Ozonied water and ozone was dissolved daily in rearing tank at 0.27 mg L iv Ozone was dissolved daily in rearing tank at 0.27 mg L and Ozone dissolved constantly in protein skimmer. Results showed that the density ofVibrio was decreased in treatment 4 however it was not significantly difference with other treatments P 0.05 . Length and wet weight of PL15 10 4mm and 0 8g respectively were significantly higher compared to those from the control treatment. However survival rate of PL15 in treatment 3 and 4 were not significant compared to control treatment P 0.05 . After taking stress test with 200mg L formalin survival rate of Pl15 in treatment 3 and 4 were significantly higher than those from other treatments p 0 05 . Keywords Ozone chlorine water treament Penaeus monodon Title Study on the possible use of ozone in shrimp Penaeus monodon larval rearing TÓM TẮT Đề tài được thực hiện với 2 thí nghiệm nhằm khảo sát sự .