During the 7-years period covered by this analysis, starting with the transfer of technology of the Japanese-type set-net in Rayong, the catch and sale value trends have increased through technical improvements in gear design and improved operation and management skills, including fish handing, marketing, and selling.
It is important that the design of the set-net fits with the specific oceanographic conditions of the fishing ground and with the migration route and behavior of the target species.
Fish behavior in relation to trap design is the key factor for optimizing design [3]. Nomura [16] described the importance of fish behavior in relation to the design of set-nets, especially the behavioral response to the le der net and the main net system.
Akiyama and Arimoto [17] also indicated a possible approach to have better catch performance of set-net according to the gear design and subsequently performed a data analysis of catch trend for different gear design of set-net [18].
The modification of the gear design in 2004 in Rayong was based on the popular design of a small scale set-net unit used in the coastal area of Toyama Bay, Japan, with the aim of increasing the entrapping efficiency in the chamber net through the use of a narrower main net system and decreasing the chance of escape with narrower and lower sloped net setting.
The learning experience in the Rayong case requires continuous effort in terms of rethinking set-net design based on monitoring of the catch trend over a long-term period.