Abstract
Rearing Pangasius hypopthalmus under short manipulated photoperiod is able to improve the growth of that fish, but the water quality of those rearing tanks were poor as there was no phytoplankton to reduce the organic materials. By using the biofloc system, the organic materials might be processed and the water quality might be maintained. To understand the water quality of P. hypopthalmus reared in the tanks with manipulated photoperiod and biofloc system has been conducted in June to august 2020. Sampling DO and BOD5 was carried out 4. Results shown that the DO of tanks with biofloc system was higher (11.814.49 mg/L) than that of the tanks without biofloc system (11.81-7.68 mg/L). The water in the tanks with biofloc system also shown better results on BOD5 (4.28-7.68 mg/L). In the tanks without the biofloc system, the water quality parameters were as follows BOD5 (4.28-35.22 mg/L). Based on data obtained, it can be concluded that the application of biofloc system is effective to maintain the water quality in the rearing tank of P. hypopthalmus treated with short photoperiod.
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