Global ghost fishing characterization model for derelict bottom set gillnets

Ghost fishing, the unintended capture of marine life by abandoned, lost, and discarded fishing gear (ALDFG), is a major cause of biodiversity loss in the marine environment. Among the many types of fishing gear, derelict bottom set gillnets are considered one of the greatest threats to marine biodiversity. However, indicators quantifying the ghost fishing damage caused by derelict bottom set gillnets are currently unavailable. Life Cycle Assessment (LCA), a comprehensive sustainability assessment tool widely used by policymakers and industry, has yet to incorporate the impacts of ghost fishing by derelict bottom set gillnets on marine biodiversity. In this study, SFI Dsolve researchers developed the first characterization factors for use in LCA to quantify the impacts of derelict bottom set gillnets on fish and invertebrate biodiversity at both global and Norwegian scales. The results showed that invertebrates and cartilaginous fish experienced stronger impacts and were more susceptible to ghost fishing than bony fish species. While this work improves our understanding of ghost fishing and can help reduce the environmental impacts of fishing, it remains a complex process that requires further research. Future work should also assess the impacts of other fishing gear, such as pots, and evaluate the potential benefits of biodegradable alternatives.

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