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KMID : 0613820150250050496
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Journal of Life Science
2015 Volume.25 No. 5 p.496 ~ p.506
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The Effects of Temperature on Maintaining the Stability of Water Quality in Biofloc-based Zero-water Exchange Culture Tanks
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Cho Seo-Hyun
Jeong Jong-Heon
Kim Myung-Hee
Lee Kyu-Tae
Kim Dae-Jung
Kim Kwang-Hyeon
Oh Sang-Pil
Han Chang-Hee
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Abstract
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This study explored adequate water temperature ranges for maintaining stable water quality in a biofloc-based zero-water exchange culture system. Five experimental tanks with the following temperatures were set up: 10℃, 15℃, 20℃, 25℃, and 30℃. First, a biofloc-based culture system was developed in the experimental tanks; then, the tanks were stocked with goldfish and went without a water exchange for 60 days. Conditions for developing a biofloc-based culture system and stable water quality in low concentrations of inorganic nitrogen compounds at 10℃, 15℃, 20℃, 25℃, and 30oC were maintained after 17, 26, 43, 68, and 78 days, respectively. Beginning from when the goldfish were stocked in the biofloc-based culture tanks, concentrations of NH4+-N remained constant and at low levels at 10℃ and 15℃, but they showed a gradual increase at 20℃, 25℃, and 30℃. Concentrations of NO2--N and NO3--N at 10℃ and 15℃ did not remain at low levels and immediately increased. While NO2--N concentrations at above 20℃ remained constant and stable at relatively low levels, NO3--N concentrations showed a gradual increase. Conditions of 15℃ and below could not maintain low and stable concentrations of NO2--N. In the pH range of 4.0 to 6.0, NH4+-N concentration decreased as the pH rose. However, there was no correlation between pH and NH4+-N concentration in the pH range of 6.0 to 8.0. These results indicate that pH levels should be kept at pH 6.0 and above to maintain a low and stable concentration of NH4+-N at above 20℃.
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KEYWORD
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BFT, Biofloc, culture system, goldfish, temperature
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