I've checked all of these bodies of water, as well as every non-shallow body of water in the Heart of Maguuma, and have found 0 fishing nodes. This is impossible to complete without the guild hall but I don't have that one.
This was paired today with another bugged daily Echovald Wilds Spirit Slayer, where none of the spirits on the map (there are 4) give you any credit, despite being named a spirit.
So essentially, I'm locked out of doing 3 dailies. This is seriously disappointing to still see so many basic things broken this far after release.