Hai, soo desu ! Lets not be too concerned, brother, since the Japanese Coast Guard already heavily patrols our territorial waters and there is no Chinese fishing boats that come into the waters without the intervention of the JCG. Whilst the North Koreans and the South Koreans may have a problem in remedying the unmitigated Chinese fishing trawlers within their respective (North Korean and South Korean) territorial waters, that issue is not a concern for us.
Might I remind you that just a year and a half ago the Japanese and Taiwanese Governments have signed a Fisheries Agreement that delineates , specifically, where the Taiwanese fishermen can fish without the intervention of the JCG. In addition, since this agreement came into law , the Taiwanese have remained firmly consistent in the agreement and operate only in agreed waters, so that is a security and territorial victory for Japan. In regards to the Chinese (mainlanders), their fishing trawlers seem to evade entering Japanese territorial waters and manage to go to the SCS instead or in the Korean waters. My reasoning for this is probably due to the lapsed security in those areas , less monitoring. If they enter Japanese waters, well, you know what happens, their ships are summarily boarded , parties are arrested, and are docked. Their ships are confiscated and the interlopers are deported.
As for "sinking illegal fishing boats", I think that is too drastic and that has only been reserved for spy vessels such as North Korean incident several years ago:
Besides these drastic situations , I believe that the JCG should maintain current standard operating procedures, and not resort to wanton aggression such as the sinking of any and all illegal fishing vessels in territorial waters. We have the capability, but we should not do that. Besides, i believe its much more economical to confiscate the vessels and sell it or use spare parts or what have you.