Quick answer: Talk to the woman beside the lake, collect all three Leeches from the ground, use the Modified Leech to summon the Giant Piranha and return its trophy.
Story location order
What makes this island different
Forest Island is where the game separates optional boss fishing from story progression. The Old Pike uses a purchased lure, but the actual route forward begins with three physical Leech pickups around the lake and settlement.
Priority route
- Talk to the woman beside the lake until the Leech request is active.
- Collect the three ground pickups before spending money on optional boss lures.
- Buy a Shotgun and enough ammunition for a boss plus its smaller piranha group.
- Exchange the Leeches for the Modified Leech and use it in the lake.
- Defeat Giant Piranha, preserve the skeleton and return it for Desert coordinates.
Forest Island route
- Talk to the lake quest NPC until the objective is active.
- Collect three small Leech pickups from the nearby ground.
- Return them and keep the Modified Leech.
- Clear the Giant Piranha’s smaller minions, then defeat the boss.
- Return the skeleton / quest trophy for the next coordinates.
Money and upgrade decisions
Forest adds ordinary Beginner Lures, the $40 Beginner Boss Lure, firearms, Dynamite and weapon upgrades. The Shotgun is the most useful progression purchase. The Old Pike is a valid collection target, but its lure competes directly with the money needed for the required Piranha fight.
Navigation and quest-item route
The story loop stays close to the inland lake: quest NPC, three ground Leech pickups, boss water and hand-in are all part of the same chain. Use the illustrated Leech guide if a small pickup blends into the ground instead of circling the full island repeatedly.
Main encounter: Giant Piranha
Talk to the woman beside the lake, collect all three Leeches from the ground, use the Modified Leech to summon the Giant Piranha and return its trophy.
Open the Giant Piranha encounter guide →
Progression checkpoints
| Moment | What to confirm |
|---|---|
| Quest start | Lake NPC has asked for three Leeches |
| Before casting | Modified Leech received, Shotgun loaded and healing available |
| During the fight | Minions thinned without ignoring the white escape bar |
| Route unlock | Skeleton accepted and Desert coordinates visible on Radar |
When to do optional work
Fight Old Pike after the Shotgun and main quest are funded. Normal Beginner Lure fishing is useful for cash and collection progress, while optional boss attempts can safely wait until the Desert contact has been unlocked.
Open the illustrated three-Leech location guide →
Solo and co-op route differences
Solo
Solo players should bring healing and keep all visible threats in one direction. Clear only the minions preventing a clean boss shot, then use sideways movement against the Piranha’s jump.
Co-op
Assign a minion-control role and a boss-damage role, but keep both players near the same side of the lake. Split teams can drag the pack across firing lanes and make the boss harder to track.
Common route mistakes
- Fishing for Leeches instead of looking for ground pickups.
- Buying the Old Pike lure before progression equipment.
- Spending the whole boss timer on minions.
- Defeating Giant Piranha but failing to return its skeleton.
Forest Island FAQ
Is Old Pike the Forest story boss?
No. Old Pike is optional; Giant Piranha and its skeleton hand-in unlock Desert Island.
Where are the Leeches?
They are small ground pickups around the lake and nearby settlement, not ordinary fishing catches.
Why did Desert not unlock after the fight?
Return the Giant Piranha skeleton to the woman beside the lake and complete the conversation.
Sources, method and evidence limits
The ground Leech route, Modified Leech exchange, minion mechanic, skeleton hand-in, optional Old Pike and Desert coordinates are corroborated by current map and completion guides.
- Official How to Fish Steam page — official island-and-boss progression premise.
- Destructoid complete walkthrough — five-island order and quest chain.
- ShowGamer island map — story gates, optional encounters and Radar sequence.
- All Things How vendor guide — item tiers, prices and upgrade availability.