Build planner
Fishing at level 20
The setup that gathers the most at your level, from everything on the wiki: judged by how long each gather takes, the chance it succeeds and the drops it gives, at the node you pick. Put your own piece in any slot and the planner builds the rest around it; save it to keep it and share it.
Tool
Its power decides which nodes you can fish: 8 reaches everything up to the Warm Pond Fishing Spot
Why: Basic Fishing Spot needs only power 1, and this build reaches the limit there, so Tidecatcher's luck counts for more than more efficiency.
Other pick: Lurecaster (Lv 7: 11 efficiency, no luck; 10% less a minute here)
Armour and accessories
One of each; rings twice
Why: The only helmet on the wiki that helps Fishing. Past the limit at the Basic Fishing Spot it adds nothing; it counts on stronger nodes.
Why: The most efficiency a chestplate gives. Past the limit at the Basic Fishing Spot it adds nothing; it counts on stronger nodes.
Other pick: Fisher's Vest (Lv 20: 23.6% efficiency; about the same here)
Why: The only leggings on the wiki that help Fishing. Past the limit at the Basic Fishing Spot it adds nothing; it counts on stronger nodes.
Why: The only boots on the wiki that help Fishing. Past the limit at the Basic Fishing Spot it adds nothing; it counts on stronger nodes.
Why: The most efficiency any gloves give. Past the limit at the Basic Fishing Spot it adds nothing; it counts on stronger nodes.
Other pick: Fishing Gloves (Lv 4: 7.5% efficiency; about the same here)
Why: The most luck an amulet gives here. Luck is a chance of a second drop on each gather.
Other pick: Subnautic Amulet (Lv 0: 17.5% efficiency, 11.5 luck; 1% less a minute here)
No ring or greaves on the wiki help Fishing.
Pet, elixir and food
Why: +5% Fishing XP. A pet's own bonus counts in full: we don't have data on which pet tier unlocks it.
+5 Fishing Efficiency, added to the flat total. Permanent. Counted at its top level: it isn't in your elixirs yet.
+49.5% Fishing Efficiency and +22.5% Fishing XP for 3 hours. Each star adds 10%.
Guild and collections
Not countedYour guild's upgrades and your collections add efficiency and XP, but the planner can't know yours. Turn them on to count them.
The Basic Fishing Spot: its page, with its drops and where it is.