Let me add a little to this
1) download autoit v3, dont worry about learning this program as it is only to let ur computer know what to do with the .au3 file that i willl explain in a minute.
2) visit the posted URL i provided, and copy that text into notepad, hit file > save as, select all files from the drop down box, name is fish.au3
3) start menu > programs > play online > FFXI > config > change screen resolution to 800x600.
4) run FFXI so you can set up, face and be perpendicular to the water
5)set a few macros, set alt 1 to
/echo .
/wait 12
/fish
6) set alt 2 to
/equip Little worm (or whatever bait you are using, CAPS MATTER)
7) log out normally

right click fish.au3 > run script
9) open final fantasy again
10) be amazed as your character starts fishing, auto sorting, reeling in, and interacting as you do NOTHING