Mass balance in aquaponics recirculation system for culturing african catfish: effect of hydraulic loading rates

Endut, Azizah and Jusoh, Ahmad and Ali, Nora’aini and Wan Nik, Wan Norsani (2011) Mass balance in aquaponics recirculation system for culturing african catfish: effect of hydraulic loading rates. In: Challenges in Environmental Science and Engineering, 25 – 30 Sept 2011, Tainan City.

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Abstract

In intensive aquaculture systems, removal of ammonia–nitrogen buildup from the metabolism of feed and supply of oxygen in fish tank are usually the two limiting factors in culturing freshwater fish. In this study, the experiments were conducted to determine the effect of six hydraulic loading rates (HLR); 0.64, 0.96, 1.28, 1.92, 2.56, and 3.20 m/day on mass balance as well as the growth performance of African catfish (Clarias gariepinus) in an aquaponics recirculation system (ARS). Determination of mass balance can be evaluated based on the most critical factor between oxygen supply and ammonia removal. The result of nitrogen mass balance, based on total ammonia nitrogen (TAN) removal revealed that the percentage of TAN removal was in the range of 69-79% and significantly affect on hydraulic loading rates. The generation and consumption of oxygen in culture tank was a function of hydraulic loading rates and fish digestion according to fish size. The increase of organic matter accumulation in terms of BOD5 was found to have a strong influence on oxygen supply. The growth performance of African catfish in terms of specific growth rates (SGR) and feed conversion ratio (FCR) were in the range of 1.95-2.32 and 1.18-1.33, respectively. It was found that the hydraulic loading rate of 1.28 m/day produced the best production performance in terms of SGR and FCR. Evaluations in nutrient-mass balance can provide information on the environmental impacts of the aquaculture activity, as well as on management quality and efficiency of resource utilization.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > Q Science (General)
Faculty / Institute: East Coast Environmental Research Institute (ESERI)
Depositing User: AP DR AZIZAH ENDUT
Date Deposited: 08 Nov 2015 02:53
Last Modified: 08 Nov 2015 02:58
URI: http://erep.unisza.edu.my/id/eprint/3782

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