How to Fish Island 5 Walkthrough: Whale & Final Boss
On Island 5, give the scientist five requested fish to obtain the Fish Bucket, summon and defeat Bowhead Whale, throw its body into the volcano to trigger Mutated Bowhead Whale, then return the final fin and use the RHIB keys to finish.
Guide evidence checked
- Scientist request
- Five fish
- Whale bait
- Fish Bucket
- Final boss
- Mutated Bowhead Whale
- Ending vehicle
- RHIB
Island 5 ending sequence
Complete the scientist request
Hand in five fish required by the live objective and collect the Fish Bucket.
Summon Bowhead Whale
Equip the Fish Bucket, land the whale encounter, and keep enough ranged damage and healing for a second fight.
Use the volcano trigger
After defeating Bowhead Whale, move its body into the volcano to begin the final Mutated Bowhead Whale encounter.
Return the final trophy
Keep the distinct whale fin and deliver it to the scientist instead of selling or losing it.
Start the RHIB
Take the awarded RHIB keys, empty your hand if the steering interaction does not respond, and activate the boat to finish.
Final-island preparation
| Need | Reason |
|---|---|
| Reliable late-game ranged weapon | Both whale encounters require sustained pressure while moving |
| Cooked healing catches | The final encounter combines contact pressure, stomps, and lava hazards |
| Free inventory space | Protect the quest bait and final trophy from accidental loss |
| Manual save backup | Back up before testing a previously unstable endgame save |
FAQ
How do I start the final boss?
Defeat Bowhead Whale and throw its body into the volcano to trigger Mutated Bowhead Whale.
What do I do after the final boss?
Return the whale fin to the scientist, collect the RHIB keys, and start the RHIB to reach the ending.
Evidence log
Sources
- Steam Global AchievementsLevel A-
- Steam Community: All 28 Achievements + Post-Game RouteLevel B
- Steam Community: Bait & Fish GuideLevel B-
- Steam Community: Item IDs and save-field referenceLevel B-
- Full 100% gameplay walkthroughLevel B-
- Steam discussion: Volcano Whale assault rifle and food methodLevel B-