Bycatch mitigation
A Pinger pilot study, Kep

What is Bycatch?
Bycatch means the accidental capture of marine animals that are not the intended target of fishing, such as marine mammals, sea turtles, or young fish, when fishermen use large nets or other fishing gear. Especially, during the process of trawling, where a bog net is dragged across the ocean floor marine wildlife is often accidentally trapped inside. This often happens during trawling, where a large net is dragged across the ocean floor and wildlife is accidentally trapped inside. Many of these animals are discarded at sea, but most do not survive because of physical stress and injuries caused by the entanglement or being thrown back.
In Cambodia, bycatch is recognised as one of the biggest threats to marine wildlife, especially endangered species whose populations are already at risk. Reducing bycatch is essential for protecting marine ecosystems and ensuring the survival of Cambodia’s unique marine life. To address this, Khmer Ocean Life works alongside fishers to develop better techniques and solutions, aiming to save wildlife while safeguarding the main source of income for fishing communities.
What are pingers and how do they work ?
Accoustic Deterrent Devices (ADDs), otherwise known as ‘pingers’, are special underwater devices that are supposed to help prevent bycatch by making sounds that warn marine wildlife, such as dolphins and porpoises, to stay away from fishing nets. These pingers emit short bursts of high-frequency sound that only certain animals can hear, reducing the chance that these animals swim into nets and get trapped.
Previous studies have shown that depending on the species the pingers effectiveness can range between 61%-97% (Fishtek Marine).

our progress so far
As part of our ongoing bycatch mitigation project, our team recently visited the community in Ou Krasar, Kep to conduct hands-on training with local fishers. This initiative includes seven participating fishers who will take part in a 13-month study trial. Throughout the project, they will collect valuable data to assess the effectiveness of acoustic pingers in reducing the accidental capture of the endangered Irrawaddy dolphin in the bottom-set gillnet fishery. By working directly with the community, we aim to promote sustainable fishing practices that protect both livelihoods and marine wildlife in Kep’s coastal waters.
What is the timeline for the project?
January 2025: Securing SMM Fund for the Bycatch mitigation Project
2025: Bycatch Mitigation Action Plan (BMAP) consultations
October 2025: Data collection training with seven local gillnet fishers
1st November 2025: Start of pinger trial period (13 months total)
December 2026: End of pinger trial period
After December 2026: Results



