To investigate whether exposure to static and 60 Hz electric and magnetic fields from undersea cables (power line) has an impact on local fish and its behavior.
Observations were performed at five time points during 2014 and 2015 to consider seasonal influences. Scuba divers conducted visual surveys on an AC and DC cable in water depth of approximately 5, 10, and 15 m respectively.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
60 Hz
AC undersea cable
|
|
|
Exposure 2:
0 Hz
DC undersea cable
|
|
| Frequency | 60 Hz |
|---|---|
| Type | |
| Additional info | AC undersea cable |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 401 nT | - | measured | - | 0.1 m distance from cable |
| magnetic flux density | 195 nT | - | measured | - | 0.5 m distance from cable |
| magnetic flux density | 78 nT | - | measured | - | 1 m distance from cable |
| magnetic flux density | 44 nT | - | measured | - | 1.6 m distance from cable |
| magnetic flux density | 33 nT | - | measured | - | 2 m distance from cable |
| magnetic flux density | 16 nT | - | measured | - | 3 m distance from cable |
| magnetic flux density | 8.9 nT | - | measured | - | 4 m distance from cable |
| magnetic flux density | 5.8 nT | - | measured | - | 5 m distance from cable |
| magnetic flux density | 3.2 nT | - | measured | - | 6 m distance from cable |
| magnetic flux density | 2.2 nT | - | measured | - | 7 m distance from cable |
| magnetic flux density | 0.4 nT | - | measured | - | 8 m distance from cable |
| electric field strength | 319 µV/m | - | measured | - | 1.6 m distance from cable |
| electric field strength | 318 µV/m | - | measured | - | 2 m distance from cable |
| electric field strength | 305 µV/m | - | measured | - | 3 m distance from cable |
| electric field strength | 290 µV/m | - | measured | - | 4 m distance from cable |
| electric field strength | 271 µV/m | - | measured | - | 5 m distance from cable |
| electric field strength | 254 µV/m | - | measured | - | 6 m distance from cable |
| electric field strength | 234 µV/m | - | measured | - | 7 m distance from cable |
| electric field strength | 225 µV/m | - | measured | - | 8 m distance from cable |
| electric field strength | 210 µV/m | - | measured | - | 9 m distance from cable |
| electric field strength | 204 µV/m | - | measured | - | 10 m distance from cable |
| Frequency | 0 Hz |
|---|---|
| Type | |
| Additional info | DC undersea cable |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 559 nT | - | measured | - | 0.1 m distance from cable |
| magnetic flux density | 279 nT | - | measured | - | 0.5 m distance from cable |
| magnetic flux density | 168 nT | - | measured | - | 1 m distance from cable |
| magnetic flux density | 110 nT | - | measured | - | 1.6 m distance from cable |
| magnetic flux density | 88 nT | - | measured | - | 2 m distance from cable |
| magnetic flux density | 54 nT | - | measured | - | 3 m distance from cable |
| magnetic flux density | 38 nT | - | measured | - | 4 m distance from cable |
| magnetic flux density | 30 nT | - | measured | - | 5 m distance from cable |
| magnetic flux density | 23 nT | - | measured | - | 6 m distance from cable |
| magnetic flux density | 18 nT | - | measured | - | 7 m distance from cable |
| magnetic flux density | 14 nT | - | measured | - | 8 m distance from cable |
| electric field strength | 0 µV/m | - | measured | - | 1.6 m to 10 m distance from cable |
No behavioral differences were observed during the exact times of power transitions. Moreover, there were no significant differences in the species richness between current "on" and "off". Although more fish were recorded during the "off" periods for both count types, no statistically significant differences were present compared to the "on" period.
The authors conclude that further research is needed as low sample sizes and high count variability may have influenced statistical analyses.
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