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Nuôi trồng thuỷ sản

Phan Vĩnh Thịnh, Huỳnh Thị Ngọc Linh, Đỗ Thị Thanh Hương, Nguyễn Thanh Phương(1)

Ảnh hưởng của CO2 và nitrit cao trong môi trường lên khả năng điều hòa acid và base của lươn đồng (Monopterus albus, 1793)

Effects of hypercapnia and high nitrite on acid-base regulation of swamp eel (Monopterus albus, 1793)

Khoa học (Đại học Cần Thơ)

2022

2

282-291

1859-2333

Điều hòa acid và base, CO2, Lươn đồng, Nitrit, pH máu

Acid-base regulation, CO2, Blood pH, nitrite, Swamp eel

Ảnh hưởng của CO2 và nitrite lên động vật thuỷ sản đã có nhiều công bố khoa học. Lươn đồng (Monopterus albus) là loài hô hấp khí trời được nuôi phổ biến ở Đồng bằng sông Cửu Long. Lươn đồng có thể bị ảnh hưởng bởi CO2 tăng do tác động của biến đổi khí hậu và nitrite cao do nuôi thâm canh. Nghiên cứu ảnh hưởng đơn và kết hợp CO2 với nitrite cao lên khả năng điều hòa acid và base trên lươn đồng (250-350 g/con) được thực hiện với 4 nghiệm thức gồm 30 mmHg CO2, 23,57 mM NO2-, 30 mmHg CO2 + 23,57 mM NO2- và đối chứng, mỗi nghiệm thức được lặp lại 6 lần. Sau 96 giờ thí nghiệm, kết quả cho thấy sự xâm nhập kết hợp CO2 và nitrite gây cản trở quá trình phục hồi pH máu của lươn đồng (pH máu giảm), nồng độ các ion Na+, K+, Cl‑ và áp suất thẩm thấu đều giảm. Tuy nhiên, lươn đồng vẫn có khả năng điều hòa acid và base trong máu cũng như điều hòa các ion khi bị nitrite xâm nhập nhờ cơ chế trao đổi ion Cl- gián tiếp (giảm ion Cl- qua sự trao đổi HCO3-/Cl-).

The effects of CO2 and nitrite on aquatic animals have been documented. Swamp eel (Monopterus albus) is an air-breathing fish that is commonly farmed in the Mekong Delta of Viet Nam. This species could be affected by high CO2 and nitrite caused by climate change and intensive farming, respectively. The study on the single and combination of hypercapnia and high nitrite on acid-base regulation on swamp eel (250-350 g/eel) was carried out in 4 treatments including 30mmHg CO2, 23.57 mM NO2 - , 30mmHg CO2 + 23.57 mM NO2 - and a control treatment with 6 replications. After 96 hours of experiment, it showed that the combined penetration of hypercapnia and nitrite prevents the pH blood recovery of swamp eels (decrease of pH blood), the concentrations of Na+ , K+ , Clions, and osmotic pressure were reduced. However, swamp eels still can regulate acid-base in the blood as well as regulate ions when being penetrated by nitrite due to an indirect Clion-exchange mechanism (reducing Clions through HCO3 - /Clexchange).

TTKHCNQG, CVv 403

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