Abstract
We investigated the effect of weak, extremely low frequency (ELF) electric and magnetic fields on the locomotor activity of Atlantic salmon ( Salmo salar) parr and American eel ( Anguilla rostrata) juveniles. Fish were individually exposed to 60 or 75 Hz electric fields of 0·07 V/m or 0·7 V/m or magnetic fields of 0·5 gauss on alternate days in LD 12:12 or DD light conditions. Neither salmon nor eels showed differences between the level or rhythmicity of locomotor activity on exposed and non-exposed days. Fish were also exposed to a 75 Hz electric or magnetic field for 1 h in every 23 h in LL, DD or LD 12:12. None became entrained to a 23 h periodicity. Thus, there is no indication that proposed ELF communications systems would influence the daily activity of Atlantic salmon or American eels.
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