Title : Comparative analyses of monofilament and multifilament gillnets in Asa River, Ilorin, Kwara State, Nigeria
Abstract:
This study presents comparative analyses of monofilament and multifilament gillnets through field surveys conducted in Asa River, Ilorin, Kwara State, Nigeria. Data were obtained using personal field observations and structured interviews, with a three-stage sampling technique employed across four major landing sites: Waterfall, Apaata, Dam, and Aliara. Five species representing five families were captured by both gear types. Results indicated that, out of a total daily catch biomass of 32,050 g, Oreochromis niloticus dominated (29,688 g), followed by Clarias gariepinus (1,422 g), Clupea harengus (638 g), Mormyrus rume (157 g), and Synodontis clarias (150 g).
Overall, 386 individuals were recorded, of which 78% were caught by monofilament nets and 22% by multifilament nets. Despite being more cost-effective, monofilament nets exhibited superior catch efficiency and species diversity, likely due to their invisibility in water, elasticity, tensile strength, and reduced weight. Multifilament nets, while less productive, remain common because of durability and local accessibility.
The findings highlight the importance of gear choice in artisanal fisheries and its direct implications for sustainability, income generation, and conservation policy. Promoting appropriate net selection may enhance productivity while balancing ecological impacts in riverine communities. The study contributes to ongoing discourse on passive gear regulation and offers evidence for sustainable fisheries management in Nigeria and other developing regions where artisanal fishing is critical to food security and livelihoods.
