How to Fish Island Progression — All Islands, Bosses & Unlocks

Quick answer

Official: Steam says quests and bosses unlock new islands with harder creatures and better gear. Video-tested: the story repeatedly follows the same pattern — complete the island request, use the resulting bait, defeat the target, keep the distinctive trophy, and turn that trophy in for the next destination.

Main-story progression at a glance

Stage	Required chain	Progress item / result
Crash / Lighthouse Island	Beer → Empty Beer Can → Spider Crab	Spider Crab hand-in → Boat Keys / boat access
Island 2	3 Leeches → Leech Bait → Giant Piranha	Giant Piranha Skeleton → Island 3 coordinates
Island 3	Endangered Creature → Carrot → Pufferfish	Pufferfish Tail → Island 4 coordinates
Island 4	Professional Boss Lure → Tuna → place Tuna on grass → Giant Bird	Bird Head → Island 5 coordinates
Island 5 / Volcano	Scientist smaller-creature step → Whale → throw Whale into volcano	Triggers Magma Whale final phase
Final	Magma Whale	Finish-game / route-home sequence in tested footage

For boss-specific combat, use the All Bosses hub.

Island 1: Empty Beer Can and Spider Crab

Give the Lighthouse Keeper a Beer Can instead of drinking it. He returns the Empty Beer Can, which becomes the Spider Crab bait. Beat Spider Crab, keep its unique quest part and complete the hand-in to unlock boat access.

• How to get Empty Beer Can
• Spider Crab boss

Island 2: 3 Leeches and Giant Piranha

The tested quest counter is 0/3, and the Leeches are tiny ground pickups, not fish you hook. Turn them in for Leech Bait, defeat Giant Piranha and keep the Giant Piranha Skeleton.

• Find 3 Leeches
• Giant Piranha boss

Island 3: Tourist, Carrot and Pufferfish

Turn in a creature labelled Endangered Species for the Tourist, receive the Carrot, use it for Pufferfish and keep the Pufferfish Tail after the fight.

Read the full Island 3 guide or Pufferfish boss guide.

Island 4: Tuna and Giant Bird

Use the Professional Boss Lure to get Tuna, place the Tuna on the grass, defeat the Giant Bird and return the Bird Head. That hand-in leads to Island 5.

Read the full Island 4 guide or Giant Bird boss guide.

Island 5: Whale and the volcano

The Scientist asks for smaller creatures before preparing the large-Whale setup. After defeating the regular Whale, the tested mission instructs players to throw it into the volcano, which leads into Magma Whale.

• Whale boss
• Magma Whale final boss

The progression rule that prevents most soft-lock confusion

Do not automatically sell, cook or gamble an unusual boss part. Tested progression depends on distinctive items such as the Giant Piranha Skeleton, Pufferfish Tail and Bird Head.

If your radar shows no new island, revisit the quest NPC and verify that the correct trophy — not ordinary Meat Chunks — was handed in.

Use the Interactive Island Atlas when you want the whole sequence on one screen.

Patch notes that change this route

• Patch 1.0.4 (official): the intended path up to the final island is easier to see; Pufferfish and Whale were nerfed.
• Patch 1.0.5 (official): you can no longer travel to islands you have not unlocked. Speedrun skips that relied on that bug are dead.
• Patch 1.1.0 “The Islet Update” (official, 28 Sep 2026): the first content update adds multiple mini islands and reworks the distance between islands. Neither changes the main route below - the six story islands and their bosses are untouched - but the sea between them is no longer the length it was at launch, so any travel-time figure taken from pre-1.1.0 footage is stale. The mini islands have no official names: the studio’s notes call them only “multiple mini islands”, so this page does not name them or place them on the route.
• Patch 1.1.0 also adds more creatures, a new mini-boss, new bait and new items (see the note below). Nothing in the update removes or renames an island, a boss or a trophy on this page.
• Patch 1.0.10 (official): ground drops can persist (up to 64, with priority on weapons/tools/quest items/creatures), so leaving a trophy on the floor is less instantly fatal than at launch — still pick trophies up.