Ideally, optimum mesh size, estimating from overall selection factor (5.3744), for female shark catfish should be up to 7.0 cm. But for the holistic viewpoint of multi-meshes/multi-species of gillnet, the 5.5 cm mesh was the compromised mesh size for shark catfish fisheries. This mesh size can prevent the incident of ‘recruitment overfishing’ from small-meshed gillnets (Amarasinghe, 1988).