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    The Effect of Light-Emitting Diodes (LEDs) on the Development of Duckweed (Lemna minor) in Co-Culture with Red Tilapia (Oreochromis spp.)
    (2023-05-01)
    Luo, Jie
    ;
    Chien, Yew Hu
    ;
    Taparhudee, Wara
    ;
    Kitikiew, Suwaree
    ;
    Kantha, Phunsin
    The effects of artificial light source and photoperiod on duckweed (Lemna minor) growth and the impact of duckweed on red tilapia (Oreochromis spp.) growth in an aquaponic culture are not well understood. This study aimed to investigate: 1) effects of light source and photoperiod on growth of duckweed and water quality, and 2) the effects of feeding red tilapia with different ratios of duckweed: artificial feed. In Phase I, three different artificial light sources (LED white light, T5 fluorescent white light, and LED blue light) were used and then a consecutive experiment was conducted using LED white light with three different photoperiods: 24:0, 16:8, and 12:12 (light:dark). In Phase II, red tilapia were fed with three feeding regimes made up of different percentages (by weight) of duckweed (0%, 5%, and 10%) to artificial pellet feed. Overall, our results suggest that using LED white light with a photoperiod of 16:8 (light:dark) was effective for maximizing duckweed growth in aquaponic culture and consequently resulted in lowest total ammonia nitrogen (TAN) and NO<inf>2</inf>-, and that replacing pellet feed with duckweed at 5% or 10% can increase the growth rate of red tilapia.
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    Nutrients formulation to maximize Ankistrodesmus sp. microalgal cell biomass and lipid productivities
    (2019-01-01)
    Pan-utai, Wanida
    ;
    Srinophakun, Penjit
    ;
    Inrung, Wilasinee
    Ankistrodesmus sp. belongs to a group of microalgae which plays a significant role in various applications. Availability of nutrients is one of the primary factors regulating the growth and development of microalgae. Twelve experiments were run to determine the optimum media formulation of significant nutrient components for maximum biomass and lipid productivities of Ankistrodesmus sp. IFRPD 1061 cultivation using Plackett-Burman design. All nutrients significantly affected biomass productivity. Highest lipid productivity may not only necessarily originate from biomass cells with highest lipid content but also depend on nutrient formulation of culture media. Microalgal cell growth rate plays a major role in biomass and lipid production. Some nutrients including phosphorus and sodium did not significantly affect lipid productivity, therefore, optimizing nutrient contents could be applied to further scale-up microalgal production.
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    Effect of light, nutrient, cultivation time and salinity on lipid production of newly isolated strain of the green microalga, Botryococcus braunii KMITL 2
    (2012-04-01)
    Ruangsomboon, Suneerat
    The green microalga strain, Botryococcus braunii KMITL 2, was isolated from a freshwater reservoir in central Thailand, and the effects of light, nitrogen, phosphorus, iron, cultivation time and salinity on lipid production were studied by varying parameters one at a time. When cultured in Chlorella medium containing 222mgL <sup>-1</sup> phosphorus (PO43--P) under continuous illumination of 200μEm <sup>-2</sup>s <sup>-1</sup> with a salinity of 0psu, a maximum lipid content of 54.69±3.13% was obtained. Its high lipid content makes strain KMITL 2 a potential source for biodiesel production in tropical regions. © 2011 Elsevier Ltd.