Volume 10, Issue 3 (2021)                   JFST 2021, 10(3): 342-354 | Back to browse issues page

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Sarsangi Aliabad H, Naji A, Seyed mortezaei S R, sourinejad I, Akbarzadeh A. Effect of different temperature, salinity and C/N ratio levels on biofloc production, proximate analyses and control of nitrogenous components in aquaculture system. JFST 2021; 10 (3) :342-354
URL: http://jfst.modares.ac.ir/article-6-47829-en.html
1- Ph.D. student in Fisheries, Department of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran.
2- Associate Professor in Department of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran. , Abolfazlnaji@gmail.com
3- Assistant Professor in Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran.
4- Associate Professor in Department of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran.
Abstract:   (1070 Views)
Biofloc technology has mentioned as a new tool for sustainable aquaculture development and has overcome the problems of water scarcity and discharge of aquaculture effluents to the environment. In this system, nitrogenous wastes (Ammonia and Ammonium) are simultaneously recovered by bacteria and converted into microbial proteins that can be consumed by aquatic animals. The purpose of this study was to investigate the factors affecting the production of biofloc and evaluate it for use in aquaculture. The effect of different temperature levels (24, 28, 32 °C), salinity (0, 4, 8 g/l)  ,and C/N ratio (10:1, 15:1, 20:1) which are the main key factors to the formation and function of biofloc system was evaluated by using a response surface method designing. Moreover, the influence of those factors on total ammonia nitrogen, nitrite, nitrate, floc volume, protein, and lipid content of biofloc was investigated. The results showed that the temperature had a significant effect on floc volume and protein content of biofloc (P < 0.05), but it had no significant effect on other nitrogenous compounds and lipid content (p > 0.05). The protein, lipid and moisture of biofloc particles were decreased by increasing salinity significantly (P < 0.05). Also, TAN and nitrite concentration influenced by C/N ratio inversely. According to the factors Optimization, providing 27 °C and C/N ratio of 18:1 in brackish water and 29 °C and C/N ratio of 14:1 in fresh water resulted in high quality biofloc production and control of nitrogenous wastes in water.
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Article Type: Original Research | Subject: Aquatic pollution and waste water management
Received: 2020/11/22 | Published: 2021/08/20

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