Abstract

Overview

The study examines the impact of electromagnetic fields (EMF) emitted by sub-sea power cables associated with Marine Renewable Energy Devices (MREDs) on the behavior and physiology of the edible crab, Cancer pagurus.

Findings

• Key stress-related parameters such as l-Lactate, d-Glucose, Haemocyanin, and respiration rates were measured.
• Behavioral responses like antennular flicking, activity level, attraction to EMF exposed shelters, and time spent roaming were also assessed.
• No effects were observed on Haemocyanin concentration, respiration rate, activity level, or antennular flicking rate due to EMF exposure.
• Significant disruptions were noted in haemolymph l-Lactate and d-Glucose circadian rhythms.
• Crabs exhibited a clear preference for EMF-exposed shelter (69%) over control (9%).
• A reduction in time spent roaming by 21% was observed.

Conclusion

The findings suggest that EMF emissions from Marine Renewable Energy Devices have significant physiological and behavioral impacts on edible crabs, indicating the need for careful consideration of EMF effects on marine crustaceans in MRED planning.