Abstract
The current study focusing to solve the water quality in aquaculture system by manufacturing the magnetic unit with different
magnetic flux density 2500 µT and 3500 µT, As well as, study the effect of the magnetic field in agricultural field specially on
growth performance and feed intake of Nile tilapia (O. niloticus). Three fish tanks selected randomly for the experiment. The
experiment was conducted for two production periods. Each period was 24 weeks. The devices were connected to the water
inlet of experimental fish tank in which the water passes through the magnetic treatment devices from South Pole to North
Pole before filling the tank. The results of laboratory tests show that there are an increase in DO concentration up to 52.6 %,
PH value up to 6.2%, and a decrease in NH3 concentration up to 35.9%with increasing the number of turns through MTD units
and with increasing the magnetic flux density to 3500 µT without any considerable change in EC and temperature. In addition,
the results of field test show that there are an increase in DO concentration up to 12% in the morning and 12.8% in evening.
On the other hand, the decrease of NH3 concentration up to 48.9% in the morning compared to 64.9% in the evening in tank
water when it was exposed to magnetic treatment units without any considerable change in PH, TDS concentration. Tank
treated with MTD2 followed by tank treated with MTD1was superior in water quality parameters as well as growth parameters
compared with control tank in the two experimental periods. From the results we concluded that the more we increased the
magnetic flux density of the unit with reducing the speed of the water within the unit, the more we increase the effect of
magnetic treatment unit on improving water quality parameters. The total power consumption was 0.00384 kW h-1
for MTD1
unit compared to 0.01536 kW h-1
for MTD2 unit. The cost of Power consumption was 8003.8 EGP/Period for MTD1 unit and
8033.8 EGP/Period for MTD2 unit compared to 7993.9 EGP/Period for control.
El-Sayed Sehsah, Ahmed El-Masry, Abd Elaziz. Okasha . (2020) MANUFACTURED MAGNETIC DEVICE FOR IMPROVING WATER QUALITY AT TILAPIA FINGERLINGS, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 6.
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