Effect of a
constant magnetic field on water quality and rearing of European sheatfish Silurus
glanis L. larvae
M. Krzemieniewski, M. Teodorowicz, M.
Debowski, J. Pesta-2004
Aquaculture
Research, 35(6):
568-573
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.
(Department of Environment Protection
Engineering, The Faculty of Environmental Sciences and Fisheries, Institute
of Environmental Engineering System, University of Warmia and Mazury in
Olsztyn, ul. Warszawska 117 B, 10-957 Olsztyn, Poland. E-mail of M.
Debowski: mardeb76@yahoo.co.uk)