EXPOSURE EFFECT OF MAGNETIC FIELD ON WATER PROPERTIES IN RECIRCULATION AQUACULTURE SYSTEMS(RAS)

Abstract

The objective of this study to investigate the effect of magnetic field on water properties recirculating
aquaculture systems. This study is based on previous works reporting the positive effects of exposure
to magnetic field on water properties, plant growth, plant germination, livestock-drinking water, and
fish fertilisation. It was conducted against the backdrop of serious issues pertaining to water quality in
recirculating aquaculture systems, which negatively impact aquaculture species growth. First, this
work evaluates the effect of exposed to magnetic field intensities of 0.10, 0.15, 0.20, 0.10+0.15,
0.10+0.20, 0.15+0.20, and 0.10+0.15+0.20 T on water quality. The results showed significant (p < 0.05)
increases of the dissolved oxygen (DO), pH, and conductivity(CD) by 17.3, 1.6, 3.0%, respectively, and
significant decreases of the ammonium level(NH4-N), specific conductivity(SPC), total dissolved
solids(TDS), oxygen reduction potential(ORP), and chlorides by 25.3, 1.1, 1.4, 1.0, 16.9, 3.4%,
respectively, throughout the experiment in recirculation aquaculture systems. Therefore, the
installation of the device in recirculation aquaculture systems is simple, low cost, and can be retrofitted
into existing systems, which helps simplify fish rearing for fish farmers.