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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.)
Author(s)
Date Issued
May 1, 2023
Type
Article
Abstract
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 NO2-, and that replacing pellet feed with duckweed at 5% or 10% can increase the growth rate of red tilapia.
Citation
Journal of Fisheries and Environment, 47(2), 99-115, 2023