reducing small-cetacean bycatch in srilankan gillnet fishery
Project members: Joshua D. Stewart (project lead) and Shanta Shamsunnahar
Gillnets, which were developed as long-lasting and affordable fishing gear, have been actively promoted since the 1960s, resulting in increased bycatch in coastal and marine cetaceans across the world. Extensive research has been ongoing for the past 30 years to identify cetacean bycatch mitigation strategies with limited success, due to their widespread popularity among small-scale fishers. Additionally, due to the nature of the fisheries (small, numerous, often with no requirements for license or registration, and typically lacking predictable landing areas) many bycatch management tools, such as observer programs, are ineffective.
A recent study found that floating, subsurface gillnets positioned 2 meters below the surface might reduce cetacean bycatch substantially. Professor Joshua Stewart, PI on a project that collaborates with fishermen in Sri Lanka, is testing this technique and its economic implications.
Shanta Shamsunnahar, a graduate student who works closely with Dr. Stewart, will assist him in conducting semi-structured interviews with fishers in Sri Lanka to determine their socioeconomic status, fishing effort characteristics, intensity perceptions, species composition, spatiotemporal distribution, and the economic costs and advantages of bycatch. This initiative will provide information on fishers' perceived barriers to using modified gear or procedures to minimize bycatch risk maximizing its real-world conservation impact.
Photo: Gillnet and fishermen in Sri Lanka