Depredation

Protecting Marine Resources, Sustaining Livelihoods


pelagikos has recently been approached by multiday boat owners to provide technical assistance to mitigate depredation of the longline fishery catch by marine mammals. Several boat owners have deployed non-explosive, acoustic devices (pingers) to deter depredation by marine mammals notably Risso’s dolphin (Grampus griseus). Initially the pingers were succesfful, according to boat owners. However over time the boat owners feel that the dolphins have begun to associate the acoustic signal from the pingers with the longline tuna and tuna-like species catch, causing the depredation to resume. Multiday boat owners are currently inserting mainlines without branch lines and baited hooks and main lines with branch lines and baited hooks, to reduce depredation of their catch.

Deterring depredation: pelagikos has discussed anti-depredation options with local marine mammal scientists and plans to discuss anti-depredation options with international marine mammal scientists in the later part of 2025.

Useful links, downloads & videos
Depredation (image)
Depredation (video)

 

Our Approach & Methodology

Pelagikos begins with evidence-based assessment, analyzing fisheries, ecosystems and community needs to design practical and sustainable management strategies.

We implement solutions collaboratively with communities, industry, and government, ensuring compliance, monitoring, and long-term conservation impact.

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Key focus

Pelagikos focuses on sustainable fisheries management, protecting marine biodiversity, and preventing illegal fishing, ensuring responsible use of Sri Lanka’s coastal, offshore, and high-seas resources.

  • Sustainable Fisheries Management
  • Conservation & Protection.
  • Compliance & Illegal Fishing Prevention

Expertise in Marine Fishery

Pelagikos offers expert guidance on managing Sri Lanka’s marine fisheries, blending scientific research, community collaboration, and policy support to promote sustainable practices.

  • Sustainable management of all marine fisheries
  • Protection of marine biodiversity
  • Combatting illegal and unregulated fishing

Frequently asked questions

What services does Pelagikos provide for Sri Lanka’s fisheries?

Pelagikos offers expert guidance on fisheries management, marine conservation, policy support, and sustainable seafood practices across coastal, offshore, and high-seas fisheries.

How does Pelagikos support sustainable seafood and marine conservation?

We promote responsible fishing practices, protect marine biodiversity, develop marine protected areas, and reduce the impact of fishing on endangered and protected species.

Which communities and organizations does Pelagikos collaborate with?

Pelagikos works closely with fishing communities, seafood exporters, government agencies, and non-government organizations to improve fisheries management and ensure sustainability.

What is the current status of Sri Lanka’s marine fisheries?

Sri Lanka’s marine fisheries include coastal, offshore, and high-seas sectors, supporting thousands of fishermen while facing challenges like overfishing and ecosystem pressures.

Why is marine conservation important for Sri Lanka?

Marine conservation ensures sustainable fish stocks, protects biodiversity, and supports livelihoods, while maintaining the health of coastal and offshore ecosystems.
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