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Medical/biological study (experimental study)

Some immunological responses of common carp (Cyprinus carpio) fingerling to acute extremely low-frequency electromagnetic fields (50 Hz).

Published in: Fish Physiol Biochem 2017

Aim of study (acc. to author)

To investigate the effects of a 50 Hz magnetic field on immune and stress parameters in common carp fingerlings.
Background/further details: In total, 120 carps with an age of 4 month were utilized. Fish were (equally? randomly?) divided onto 15 plastic tanks. After a 2-weeks acclimatization period, the fish were exposed to a magnetic field of 1) 0.1 mT, 2) 0.5 mT, 3) 1 mT, 4) 2 mT or 5) sham exposed (Remark EMF-Portal: Probably, fish from three tanks were subjected to the same treatment. Hence, every group would consist of 24 animals.). Blood of 4 fish per tank was collected and examined 15 and 60 days after exposure/sham exposure.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: 2 hours
Exposure 2: 50 Hz
Exposure duration: 2 hours
Exposure 3: 50 Hz
Exposure duration: 2 hours
Exposure 4: 50 Hz
Exposure duration: 2 hours
Exposure 1
Main characteristics
Frequency 50 Hz
Type
Exposure duration 2 hours
Exposure setup
Exposure source
Chamber container (30 x 12 x 12 cm3) with water of the same quality and temperature (22 ± 4°C) as in the rearing tanks
Setup magnetic field was generated with a cylindrical coil of 80 cm length, an inner diameter of 18.5 cm and an outer diameter of 20 cm; coil constisted of 490 turn of enameled copper wire (2.5 mm diameter); fish were placed in the middle of the coil to ensure that all fish received th same magnetic field intensity; coil was positioned in an east-west direction and magnetic field was parallel to long axis of fish body; digital temperature controller has been installed inside the coil; an air conditioning system ventilated the coil interior chamber to maintain temperature at 22°C; plastic pipes containing cold tap water which circulated around the coil were used for cooling
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 0.1 mT - calculated - -
Exposure 2
Main characteristics
Frequency 50 Hz
Type
Exposure duration 2 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 0.5 mT - calculated - -
Exposure 3
Main characteristics
Frequency 50 Hz
Type
Exposure duration 2 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 1 mT - calculated - -
Exposure 4
Main characteristics
Frequency 50 Hz
Type
Exposure duration 2 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 2 mT - calculated - -
Exposed system:
  • animal
  • carp fingerling (Cyprinus carpio)
  • whole body

Methods Endpoint/measurement parameters/methodology

Investigated material:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

The levels of C3 and C4 as well as the the enzyme activity of lysozyme were significantly reduced in all exposure groups (all magnetic flux densities and after 15 and 60 days) compared to the sham exposure group while the levels of alanine aminotransferase, aspartate aminotransferase and alkaline phosphatase were significantly increased.
The authors conclude that a single exposure to a 50 Hz magnetic field may have long-term effects on immunological and stress-related parameters in carps.
Study character:

Study funded by

  • not stated/no funding

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