Are MF and EMF of anthropogenic origin potential threats to early life stages of fish?

Authors: Fey DP, Jakubowska M, Greszkiewicz M, Andrulewicz E, Otremba Z, Urban-Malinga B

Year: 2019 Jan 30

Category: Aquatic Toxicology

Journal: Aquat Toxicol

Institution: Aquat Toxicol

DOI: 10.1016/j.aquatox.2019.01.023

URL: https://www.ncbi.nlm.nih.gov/pubmed/30780112

Abstract

Abstract Overview

The increasing number of underwater cables that transfer electric current in aquatic environments raises concerns about the potential impacts on marine life, particularly during the early life stages of fish.

Study Findings

  • In this study, eggs and larvae of rainbow trout, Oncorhynchus mykiss, were exposed to a static magnetic field (MF) of 10 mT and a 50 Hz electromagnetic field (EMF) of 1 mT over a 36-day period.
  • The study investigated effects from the eyed egg stage to approximately 26 days post hatching.
  • Results showed no significant impact on embryonic or larval mortality, hatching time, larval growth, or the time larvae swim-up from the bottom due to MF and EMF exposure.
  • Interestingly, both MF and EMF increased the yolk-sac absorption rate, which may influence subsequent feeding efficiency and weight gain at the first feeding stage.

Conclusions

Although no direct lethal effects were observed, the enhanced yolk-sac absorption rate suggests a potential sub-lethal influence of MF and EMF on fish development. Continued monitoring and research into the effects of electromagnetic fields in marine settings are crucial. Early life stages of fish, particularly those settled on the bottom, may be undergoing subtle yet impactful changes due to exposure to these fields, which could affect their development and survival.

EMF MF fish development aquatic environments magnetic fields electromagnetic fields environmental impact
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