Use oyster bait! I’ve noticed an increase in size for my fishies when fishing using the oyster bait in the event hotspot.
My current setup includes:
- 3x Major Fishing Gathering Luck
- Fierce Fisherman boots and pants
- Vengeful Smock, Gloves and Hat
- Lucky Day/Night 3, and Daytime Colossus 3 (better if you can get nighttime colossus as well)
Hopefully this helps and good luck fishing!