Finally finished lvl 60 quest "Carpe Diem", it was pretty annoying so I will share what I found.

Obviously from the quest text you know it is in the eddies and mooches from bullfrog. Gathering requirement seems low perception might be high not sure and you have to catch an HQ. I only ever caught them from 11 pm to 3 am. Weather was usually clear, not sure about that.

Patience buff may be required going into the catch, I caught 5 nq, some with patience up. For bait either Stonefly or Spiders work. You want to catch a HQ bullfrog. I found it was rare to straight catch this but they can be mooched from Crickets.

The spot also has dragonskin map so that is pretty useful.

Good luck as there are many other fish that mooch there.