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

 

ABSTRACT

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.

Keywords

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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