No. The nearest I have seen is the
Who Dun It map. It's a conditional map. Hold x number of certain terr. and you can attack a certain location or (maybe) locations. So fishing areas can open up the more you advance in a different area of the map.
Option:
You could have an A, B, C that all reset to zero.
A attacks shallow +1
B attacks medium +2
C attacks deep +3
This might be an assault style map. Each tribe has a dock. Each dock could assault fishing ships A,B,C. Then from there attack different depths as above.
What would be cool and different is the fishing spots D,E,F would give a bigger bonus but revert to neutral. So like fishing you can harvest but can't stay and have to go back to port with your payday bonus, if you hold it.