you can use AutoAngler 2 to fish for you without moving or needing a profile.
just turn off pool fishing.
however, you also need an anti-afk plugin like rarekiller, because it will just fish and fish and fish and fish, until your bags are full or you get killed, etc. and it will still, try to keep fishing.
if you do this, remember to check the bot every few minutes because it's not intelligent, it can't just move to water and start fishing again, etc. if you want that, you need to use a fishing profile.
or, you could use a professionbuddy script to level fishing and sell/mail the items you have, then move to a different area every few minutes, etc.