How to Fish Walkthrough — Islands, Quests and Boss Order

FAST ANSWER

Progress by completing each island's NPC request, bait, boss and trophy hand-in; a boss kill alone does not always reveal the next route.

The main How to Fish route is Lighthouse → Island 2 → Island 3 → Island 4 → military/volcano → RHIB ending. Each stage follows the same rule: finish the local request, defeat its boss, keep the distinctive trophy, return it, and follow the new Radar coordinates. Killing a boss is often only half the objective.

Route at a glance

Stage	Required chain	Result
Lighthouse	Beer Can → Dry Beer Can → Spider Crab → keeper hand-in	Boat keys and Radar access
Second island	Collect 3 Leeches → continue Leech Bait chain → Giant Piranha	Next route after the quest item is returned
Tourist island	Endangered creature → Carrot → Pufferfish → keep Tail	Coordinates for the next island
Island 4	Professional Boss Lure → Tuna → Terrorizing Bird → keep its head	Next coordinates and the late-game route
Military and volcano	Scientist requests → Whale bait → Whale into volcano → Mutated Bowhead Whale	Lava-whale sequence and final trophy
Ending	Return the lava-whale tail to the scientist → take RHIB keys → start RHIB	Credits and the “We are so back” achievement

1. Lighthouse and boat keys

Speak to the Lighthouse keeper, collect easy early creatures, and use those sales to buy the basic rod and a reliable early weapon. Buy the Beer Can and hand it to the keeper. The returned Dry Beer Can is the bait for the Spider Crab.

Sharpen the knife before the fight. When the crab lunges, move sideways and attack during the visible dizzy window. Return the required boss result to the keeper instead of leaving immediately. The Spider Crab guide covers the combat timing and the hand-in that leads to the boat keys.

Buy the Radar before sailing. It is the practical link between completed hand-ins and the next destination.

2. Three Leeches and the Giant Piranha

On the second island, the objective asks for three Leeches. Search the shallow wet pools for ground pickups and watch the counter reach 3/3. They are pickups for the active request, not ordinary fish to catch and sell.

Prepare the Giant Piranha fight with ammunition and a free inventory slot. Focus the large target; use smaller fish only when healing is needed. After the kill, check the named quest result and return it before repeating the boss. Use the Giant Piranha guide for the fight table.

3. Tourist, Carrot and Pufferfish

The Tourist's endangered-creature request produces the Carrot needed for the Pufferfish chain. Do not search for a random carrot elsewhere when the objective is still waiting for the Tourist's hand-in.

For the boss, build a route around trees or solid cover. The player being chased keeps the loop predictable while solo or co-op shooters use the rerouting window. After the kill, keep the distinct Pufferfish Tail and return it for the next coordinates.

4. Island 4: Tuna and Terrorizing Bird

Buy the Professional Boss Lure when the Island 4 objective points you toward Tuna. Catch the required Tuna, use it to advance the local chain, and defeat the Terrorizing Bird. Preserve the Bird's head rather than selling every drop. Both current full walkthroughs place this hand-in before the military and volcano stage.

5. Military base, scientist and the volcano

Follow the scientist's requests before using the whale bait. After defeating the required Whale, keep the body and carry it to the volcano; throwing that Whale into the crater advances the experiment and leads to the Mutated Bowhead Whale sequence. Do not substitute a random creature or assume the first whale kill is the ending.

After the lava or mutated whale dies, keep its tail. A current ending guide independently confirms the final hand-in: return the tail to the scientist, take the RHIB keys, then interact with and start the RHIB. The boss kill alone does not trigger the credits.

If progression stops

Check these in order:

1. Read the exact active objective.
2. Confirm the collection counter is complete.
3. Check the inventory for a boss tail, skeleton, body or other distinctive quest object.
4. Return to the NPC who started the current chain.
5. Confirm the Radar received the next coordinates.
6. Only repeat a boss after confirming that the original quest object is gone or unusable.

For achievements that do not belong to the main route, use the boat and seagull achievement guide. Return to the How to Fish hub for buying advice, player reviews, platform status and saves.

What this walkthrough does not guess

The official store confirms the game's systems but does not publish an island-by-island solution. The route above is included because multiple current walkthroughs agree on the sequence. This page does not claim exact boss health, guaranteed fight times, a universal best weapon, or a recovery command for a lost trophy. If the live objective text differs after a patch, follow the objective and preserve the named quest item.

Sources

• How to Fish full island and boss progression walkthrough
• How to Fish walkthrough, bosses and achievements
• How to Fish ending, island route and RHIB steps
• How to Fish official Steam listing