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Vol. 54, No. 2 (2018) Trang: 18-26
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Article info.



Received 27 Dec 2017
Revised 05 Mar 2018

Accepted 30 Mar 2018


This study is aimed to evaluate the effects of different carbon dioxide (CO2) levels on acid-base regulation and growth performance of basa catfish (Pangasius bocourti). The study included two experiments, (1) effect of different CO2 levels (1%, 2%, 3%) on fish blood physiological parameters,and (2) effect of CO2 levels on fish growth performance. In the first experiment, the experimental setup consisted of a big tank (1 m3) that recirculated water to 4 smaller tanks (200 L) with 45 fish in each. The water partial pressure of carbon dioxide (pCO2) was controlled with an Oxyguard Pacific box coupled with a G10 ps CO2 probe and a K01svpld pH probe (Oxyguard International A/S, Farum, Denmark). The blood samples were collected at 0, 1, 6, 24, 48, 72, 96 and 168 hrs. after equilibration to investigate pHe, pCO2, [HCO3-] and [Cl-] in plasma. The grow-out experiment was set up for 60 days and fish was weighed at the day 0, 30 and 60. The results showed that, after 1 hr. of CO2 exposure, pHe wassignificantly decreased (7.51±0.01 in control fish and 7.28±0.02 in the fish exposed to CO2 3%, this parameter was recovered after 6 hrs. pCO2 and [HCO3-] increased at all CO2 exposed groups. After 168 hrs., pCO2 and [HCO3-] in plasma of 3% CO2 exposed fish were significantly increased and reached the values of 20.7±1.35 mmHg and 22.2±1.16 mM, respectively; those pCO2 and [HCO3-] values were 2.7 and 3.2-fold as high as the values of control fish. [Cl-] concentration in plasma of fish in 2% and 3% CO2 treatments were significantly decreased after 48 hrs. of CO2 exposure in comparison with control treatment (p<0.05). Besides, weight gain, daily weight gain and specific growth rate were significantly decreased, while feed conversion ratio increased with the increase of CO2 concentrations (p<0.05). In conclusion, carbon dioxide was found to have significantly effects on acid-base regulation and growth performance of fish. Increasing of carbon dioxide in aquaculture systems should be regulated.


Basa catfish, acid-base regulation, CO2, growth, Pangasius bocourti

Cited as: Ha, N.T.K., Bieu, N.T.X., Phuong, N.T. and Huong, D.T.T., 2018. Effect of CO2 on acid-base regulation and growth performance of basa catfish (Pangasius bocourti). Can Tho University Journal of Science. 54(2): 18-26.

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