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Drifting fish aggregating devices in the Indian ocean impacts, management, and policy implications
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Researchers assessed 63 drifting fish aggregating devices (floating structures used to attract tuna for easier fishing) recovered along Somali coastlines and found that none complied with international fishing regulations, highlighting widespread illegal and unregulated fishing practices in the Indian Ocean. Abandoned and non-compliant FADs contribute to ocean debris and ghost fishing, adding to marine plastic pollution.
The Indian Ocean has seen a rise in technologically advanced drifting fish aggregating devices (dFADs), significantly increasing tropical tuna catches. These devices, equipped with GPS buoys and echo sounders, enhance fishing efficiency but also lead to increased juvenile tuna and bycatch species catches, ghost fishing, and abandoned gear. This study assesses the technological sophistication, and ecological impacts of dFADs in the region, particularly their role in IUU fishing when they drift into the Somali EEZ. Over a six-month period, 80-dFADs were opportunistically recovered along the four-sample coastline, with 63 being included analysis. None of the recovered dFADs complied with IOTC regulations. The study estimated the potential number of dFADs per km per annum over the Somali shelf as 1395 dFADs that could theoretically be recovered annually. This underscores substantial regulatory non-compliance and emphasizes the need for enhanced monitoring, stricter regulations, and IOTC cooperation to address the ecological and economic impacts on regional marine ecosystems and communities.
More Papers Like This
Drifting Fish Aggregating Devices in the Indian Ocean: Impacts, Management, and Policy Implications
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Researchers examined the prevalence and governance implications of abandoned, lost, and discarded fishing gear (ALDFG) drifting fish aggregating devices (dFADs) along the Somali coast in the Indian Ocean. Over six months, 63 dFADs were recovered along a sample coastline — none fully compliant with Indian Ocean Tuna Commission regulations — with projections estimating approximately 1,439 dFADs wash ashore annually across the entire Somali shelf.
Global impacts of drifting fish aggregating devices on marine protected areas
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Tuna fishing boats release thousands of floating devices (called dFADs) to attract fish, but these often drift into ocean protected areas where they can entangle wildlife, damage habitats, and leave plastic debris behind. This study found that over half of the world's marine protected areas have likely been affected by these devices, putting nearly 500 vulnerable species at risk — and as this plastic breaks down in the ocean, it can contribute to the microplastic pollution that's increasingly found in seafood we eat. The findings point to a need for stricter rules and more transparency from the fishing industry to protect these critical marine ecosystems
Biodegradable drifting fish aggregating devices: Current status and future prospects
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Researchers assessed the neurotoxic effects of polystyrene microplastics on the freshwater snail Lymnaea stagnalis, finding altered locomotor activity, disrupted chemosensory behavior, and changes in serotonin and dopamine signaling after waterborne exposure. The results suggest that microplastics can interfere with neurochemical pathways in freshwater invertebrates at environmentally realistic concentrations.
Modeling the convergence of buoyant debris in the Indian Ocean: Insights from surface drifter trajectories and Lagrangian simulations
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Researchers used six surface drifter trajectories in the Southern Indian Ocean, combined with Lagrangian particle simulations that incorporate Stokes drift, to map a plastic convergence zone in the western basin fed by the Agulhas Return Current and South Equatorial Current—filling a major gap in understanding where buoyant debris accumulates in this under-monitored ocean.
Dispersal and Beaching Patterns of Drifting Fish Aggregating Devices (dFADs) as Marine Litter in the Northern of Gulf of Guinea
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Analysis of GPS tracking data from fish aggregating devices deployed in the Gulf of Guinea between 2008 and 2014 found the highest beaching rates in the northeastern gulf, driven by Guinea Current retroflection. The study identifies high-risk overlap zones between beached FADs and key fish spawning habitats, highlighting the ecological threat of this form of marine debris.
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