Exposure to Electromagnetic Fields from Submarine Power Cables Can Trigger Strength-Dependent Behavioural and Physiological Responses in Edible Crab

Abstract

Overview

The study focuses on the impact of varying strengths of electromagnetic fields (EMF) emitted from submarine power cables on the edible crab, Cancer pagurus. Three EMF intensities were tested: 250 µT, 500 µT, and 1000 µT.

Findings

• At 250 µT, crabs exhibited minimal physiological and behavioral changes.
• Exposures at 500 µT and 1000 µT disrupted key physiological markers such as L-Lactate and D-Glucose levels and altered Total Haemocyte Counts (THC).
• Certain behavioral shifts were noted, including a preference for EMF-exposed shelters and a decrease in roaming activity at higher EMF strengths.

Conclusion

The findings indicate that EMF strengths of 500 µT or greater can cause significant physiological stress and behavioral alterations in C. pagurus. A threshold of 250 µT is suggested to minimize changes, critical for the design of Marine Renewable Energy Devices (MREDs) and related policies. Future research should expand to different life stages and other benthic crustaceans.