Does a second fishing spot for the same fishing dock give a further bonus?

[Vercinger]

I have a spot where if I terraform 3 tiles of river into land I'll be able to build a fishing dock that covers 2 separate fishing spot bonus areas. Will this double the bonus? Or is it better to build 2 docks that each cover 1 fishing spot?

[starlight78sso]

Better to build 2 docks.