the setting site decision is another factor, especially in relation to the sea bed topography [3,16] for estimating the migration route of fish schools towards the coastal waters. Following the installation of the second set-net unit in 2006, the annual total catch increased, while the catch did not achieve double the amount of the single unit (Fig. 2). This result suggests that these two neighboring units share the same stock migrating to the Mae Rumpheung water due to the close proximity of the two units. The appropriate setting distance of neighboring units should be considered in any future expansion phase of the set-net technology transfer program. The simulation results on cost-profit balances of the Rayong set-net show that a higher unit price with few fishers can enable an income and profit increase under community-based management. In this management strategy under the committee system for a fishers' group, the yearly profit is partially shared among fishers as a bonus at the end of the fishing season, partially spent as the expenditure for daily/yearly gear maintenance (e.g., repair and replace parts of the gear), and partially saved for preparing new units of set-net gear (as in 2006) or for introducing new devices (such as the line-hauler or high pressure water jet net cleaner in 2008).