Ảnh hưởng của tần suất xử lý ozone lên chất lượng trứng cua biển (Scylla paramamosain)

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Tác giả: Việt Bắc Nguyễn, Ngọc Út Vũ

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học (ĐH Cần Thơ) 2020

Mô tả vật lý: 176-183

Bộ sưu tập: Metadata

ID: 394731

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu được thực hiện nhằm xác định tần suất xử lý ozone thích hợp cho giai đoạn trứng cua biển nhằm nâng cao tỷ lệ nở của trứng và tỷ lệ sống của ấu trùng. Bốn nghiệm thức thí nghiệm với tần suất xử lý ozon khác nhau gồm: (i) đối chứng (xử lý iodine), (ii) xử lý ozone 1 ngày/lần, (iii) xử lý ozone 2 ngày/lần và (iv) xử lý ozone 3 ngày/lần. Ozone được sục vào bể ương thông qua máy venturi với nồng độ ozone 0,1 mg/L trong thời gian 60 giây. Kết quả thí nghiệm cho thấy tỷ lệ nở và tổng số ấu trùng thu được ở nghiệm thức sử dụng ozone tần suất 1 ngày/lần là 57,4% và 4,25 x 103 ấu trùng/g cua mẹ thấp hơn không có ý nghĩa (p>
0,05) so với nghiệm thức đối chứng lần lược 62,3% và 5,51 x 103 ấu trùng/g cua mẹ. Nhưng tỷ lệ nhiễm nấm, ký sinh trùng, mật độ vi khuẩn tổng và vi khuẩn vibrio trên trứng cua ở nghiệm thức sử dụng ozone 1 ngày/lần thấp hơn có ý nghĩa thống kê so với các nghiệm thức còn lại. Kết quả nghiên cứu cho thấy, xử lý ozon với tần suất 1 ngày/lần giúp kiểm soát tốt bệnh nấm, vi khuẩn và kí sinh mà không ảnh hưởng đến chất lượng trứng và ấu trùng cua biển., Tóm tắt tiếng anh, This study aimed to determine the appropriate application frequency of ozone for disinfection of incubated eggs of mud crab. The experiment was designed with four treatments and triplicated including (i) control (iodine disinfection), (ii) ozone daily disinfection, (iii) ozone disinfection every 2 days, and (iv) ozone disinfection every 3 days disinfection. Ozone was applied to the rearing tanks through a venturi pump for 60 seconds at a concentration of 0.1 ppm. The results showed the hatching rate and number of larvae in the treatment with daily ozone disinfection were 57.4% and 4.52 x 103 ind. which were not significantly lower than those from the control (62.3% and 5.51 x 103 ind., respectively). Fungus and parasite infection ratios were statistically lower in the treatment exposed to daily ozone disinfection. Total bacteria and Vibrio counts on the incubated eggs in treatments with ozone disinfection were significantly lower than those of the control. The results suggested that ozone disinfection could be applied daily in the mud crab hatchery practices.

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