Study type: Medical/biological study (experimental study)

Otolith fluctuating asymmetry in larval trout, Oncorhynchus mykiss Walbaum, as an indication of organism bilateral instability affected by static and alternating magnetic fields. med./bio.

Published in: Sci Total Environ 2020; 707: 135489

Aim of study (acc. to author)

The effects of exposure of rainbow trout larvae to a static magnetic field or 50 Hz magnetic field on the development of the inner ear should be investigated.

Background/further details

The magnetic flux densities applied in this study are similar to those recorded in the vicinities of underwater AC and DC cables, respectively.
Rainbow trout eggs were collected after spawning and divided into the following groups: exposure to the static magnetic field until 1) 5 days post hatch (n = 20), 2) 15 days post hatch (n = 30) and 3) 23 days post hatch (n = 30) as well as exposure to the 50 Hz magnetic field until 4) 4 days post hatch (n = 20), 5) 13 days post hatch (n = 30) and 6) 24 days post hatch (n = 30). For each exposure group, a separate control group was used.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 0 Hz
Exposure duration: up to 36 days
Exposure 2: 50 Hz
Exposure duration: up to 37 days

Exposure 1

Main characteristics
Frequency 0 Hz
Type
Exposure duration up to 36 days
Exposure setup
Exposure source
  • not specified
Setup generator produced uniform magnetic field
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 10 mT - - - -

Exposure 2

Main characteristics
Frequency 50 Hz
Type
Exposure duration up to 37 days
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 1 mT - - - -

Reference articles

  • Fey DP et al. (2019): Are magnetic and electromagnetic fields of anthropogenic origin potential threats to early life stages of fish?

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

Otolith fluctuating asymmetry was significantly increased in all exposure groups with exposure to the static magnetic field (groups 1-3) compared to the respective control groups. In the exposure groups with exposure to the 50 Hz magnetic field (groups 4-6), otolith fluctuating asymmetry was also increased compared to the control groups but the differences were not statistically significant.
The authors conclude that exposure of rainbow trout larvae to a static magnetic field might affect the development of the inner ear.

Study character:

Study funded by

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