Solution advanced by
ycatch of elasmobranchs, remains a significant challenge in gillnet fisheries targeting gadoids and Greenland halibut. Many of these species are particularly vulnerable due to slow growth rates and low reproductive capacity, making bycatch reduction a key priority for sustainable fisheries management.
The MarineGuardian magnetic deterrent solution aims to reduce unintended interactions between elasmobranchs and gillnets by exploiting the natural sensitivity of these species to magnetic fields.
The challenge
Gillnet fisheries operating in deep and cold waters can unintentionally capture elasmobranch species such as skates, chimeras, and Greenland halibut-associated deep-water sharks. Once entangled, these species often suffer high mortality, contributing to population decline and increasing conservation concern.
Effective mitigation measures are needed that can be integrated into existing fishing gears without affecting target catch or fishing efficiency.
Dipturus batis
Amblyraja hyperborea
Etmopterus princeps
Chimaera monstrosa
The solution
This MarineGuardian solution explores the use of magnetic deterrent devices incorporated into gillnets. Elasmobranchs possess specialised sensory organs that allow them to detect magnetic and electric fields. By introducing magnetic elements into fishing gear, the deterrent aims to:
- Discourage elasmobranchs from approaching the net
- Reduce the likelihood of entanglement
- Maintain selectivity for target species
Development and progress
Work on the magnetic deterrent device is currently in the exploratory phase:
- Technology exploration is underway, focusing on identifying suitable magnetic materials and configurations
- Future steps will assess feasibility, integration into gillnets, and potential effectiveness under commercial fishing conditions
Expected impact
The magnetic deterrent device is expected to contribute to:
- Reduced bycatch of elasmobranchs in gillnet fisheries
- Improved protection of vulnerable skate, chimera, and shark species
- Practical mitigation solutions compatible with commercial fishing operations
