Effect of a constant magnetic field on water quality and rearing of European sheatfish Silurus glanis L. larvae

Abstract

The influence of a constant magnetic field with an intensity ranging from 0.4 to 0.6 T (Tesla) was determined on physicochemical parameters of water and on rearing of larvae of the European sheatfish Silurus glanis L. larvae. In the experiment, feeding brood of European sheatfish was reared in two groups. One was kept in tanks supplied with magnetically treated water. The second group was kept in tanks supplied with water without treatment with a magnetic field (control). The fish tanks were supplied with circulating river water. Rearing was conducted for 15 days at an initial stocking density for both groups of 8 fish per litre. The mean fish mass obtained was 0.46 g, and in the control group – 0.78 g (P<0.05). Stocking mortality was 19.1% in the tanks with a constant magnetic field, and 13.5% in the control group. No changes were observed in water phosphate, ammonium, organic compounds or chloride concentrations.

Influence of continuous magnetic field exposure on water properties and subsequent effects on the growth performance, plasma biochemistry, nutritive value and liver histopathology of Jade PerchScortum barcooin a recirculating system

“…Though generally, no significant difference in the measured water quality parameters, which is in agreement with a study using over twofold higher Tesla levels (0.4–0.6 T) during the larviculture of S. glanis (Krzemieniewski et al, ). On the other hand, other studies reported that magnets could substantially improve water quality (AbdelHady et al, ; Hassan, Rahman, Kamaruddin, & Madlul, ; Krzemieniewski et al, ). Krzemieniewski, Debowski, Janczukowicz, and Pesta () found that 0.40–0.60 T could reduce orthophosphates, chlorides and ammonia‐N in the breeding tank.…”

“…The potential use of magnetized water has also extended to various fish species as well as Artemia spp (Hassan & Rahman, ; Krzemieniewski, Teodorowicz, Debowski, & Pesta, ; Thaker, Faris, & Jassim, ). For instance, Hassan et al, () reported that the 0.15 T promoted growth in tilapia while Thaker et al () found that increasing T levels from 0.075 to 0.30 enhanced several metabolisms in common carp, although the implications for productivity were not investigated.…”

“…More recently, Hassan and Rahman () demonstrated that 0.10–0.20 T improved water quality parameters and even hatchability of Artemia. In contrast, increasing magnetism from 0.40 to 0.60 T during the larviculture of European sheatfish Silurus glanis where survival rate dropped by 5.6% (Krzemieniewski et al, ). Krzemieniewski, Debowski, Janczukowicz, and Pesta () suggested that these adverse effects could be due to the smaller size of the fish when compared with the magnetic intensity used.…”

Water purification using magnetic assistance: A review

“…Magnetic pre-treatment to water alters its chemistry with respect to pH, ionic composition and microbe mutation which impacts the quality of drinking water in a positive and negative manner [98][99][100]. In one study, double distilled water samples were exposed for 48 h to 50 Hz powerline electromagnetic field (EMF) strength of 51.2 T (36.2 RMS).…”

Impact of magnetic water treatment technology on water parameters, growth performance and blood parameters of the Nile Tilapia (Oreochromis niloticus)

“…The overall yield has effected and improved organism performance. Also, other studies revealed that the magnetic field can change the water's surface tension, density, viscosity, hardness, conductivity and solubility of solid matter, which changes the properties of water and improve the biological activities of the water, affecting positively the performance of animals (Gabrielli et al, 2001;Krzemieniewski et al, 2004 &Khudiar andAli, 2012).…”