A poor catch and hard maintenance work were noted for the first year (2003) that the set-net was in operation due to an inappropriate design of the gear and lack of familiarity with the gear by the fishers, resulting in a low number of operation days and a low value of unit price. After technical advice and support from the Japan-side counterparts in 2004, the gear design was improved in three major aspects, namely, net width in the main net system was decreased, the setting of the slope net from the playground to the chamber trap was lowered and narrowed, and 800 sandbags, each 60 kg were used to replace the iron anchors originally employed for gear installation in 2003. The routine work of net maintenance, such as the periodical net cleaning and replacement with spare nets, was also improved: every 3 weeks for the chamber trap, 2 months for the playground, and 3 months for the leader net.