Bowhead Whale Boss Guide (Deadliest Catch) — How to Fish

Updated 2026-08-26

How to summon and beat the Bowhead Whale in How to Fish: the scientist's Fish Bucket quest, why you must keep the body, and the 'Deadliest catch' achievement on the Volcano island.

Players fighting a giant boss in How to Fish
Official How to Fish screenshot from the Steam store, showing a boss fight.

The "military creature" is the Bowhead Whale

On the Volcano island — the military outpost area — the scientist and the military are tracking something huge. The Steam achievement for the fight, 'Deadliest catch' (25.8% global unlock rate), reads "Help the military defeat the big creature they located." That creature is the Bowhead Whale, the Volcano's story boss and the trigger for the final encounter.

How to get the Fish Bucket

The Bowhead Whale does not answer any lure, including the Scientific Boss Lure. Per the KeenGamer walkthrough, the chain is: 1. Reach the Volcano/Military area. 2. Complete the scientist's requests — catch five Volcano-native fish with the Scientific Lure ($500). The pool is small: Stonefish, Blobfish, Anglerfish, Oarfish, and Superdwarf Fish. 3. Receive the Fish Bucket. 4. Equip the Fish Bucket as bait and cast to summon the Bowhead Whale. 5. Defeat it — and keep the body. Because the summon item comes from catching all five normal Volcano fish anyway, this quest doubles as your collection progress for the island.

The fight: endgame gear is not optional

This is the last boss before the finale, and it is tuned for endgame equipment. Arrive with your best fully upgraded weapon and cooked food for healing. If the fight feels unwinnable, back off and finish your upgrades — the Fish Bucket stays in your inventory, and nothing about the quest expires.

Do NOT sell the whale

The Bowhead Whale's body is the trigger for the final boss: you carry it to the volcano crater and throw it in to start the Mutated Bowhead Whale encounter. Selling it locks you out of the ending until you somehow replace it — treat the body as a quest item, not loot. The 'Deadliest catch' achievement fires as the quest advances; if it did not pop, check whether the body is still lying in the arena before assuming a bug.

What comes next

Carry the whale to the crater, throw it in, and the final boss begins immediately — so heal, reload, and arrange your inventory before the throw. Defeat the Mutated Bowhead Whale, take its fin to the NPC in the hazmat suit, and you receive the military boat key for the ride home and the credits. Our final boss guide covers that encounter step by step.

How to apply this guide safely

Begin with “The "military creature" is the Bowhead Whale” and compare it with the objective, inventory, and controls shown by your installed build. Do not change several variables at once. If the guide concerns progression, complete one dialogue or hand-in and confirm the objective changed before sailing away. If it concerns combat, test the control or equipment choice on an ordinary encounter before spending a boss trigger. If it concerns troubleshooting, preserve the save and start with reversible checks such as restarting the session and verifying files.

Keep a short run record with the game version, solo or co-op state, host identity, starting objective, relevant equipment, steps taken, and outcome. Physics, network state, and retail patches can make two attempts look different even when both players describe them honestly. A controlled record lets you identify which condition changed. It also gives the developer a useful reproduction if the result points to a defect rather than a missed quest step.

Evidence and version check

This article uses KeenGamer — How to Fish: Complete Walkthrough & All Fish Locations, Steam Community Achievements — How to Fish. Official store text and developer announcements establish supported features and broad progression. Steam achievement wording establishes that a named action exists, but it does not prove an exact coordinate, probability, price, damage value, or hidden timer. Community discussions can reveal a repeated problem and possible workaround, but one reply is not treated as a universal mechanic. Where evidence stops, the guide uses cautious testing steps instead of inventing a precise answer.

Before relying on an older route, check the Steam news and discussion dates against the updated date at the top of this page. Prefer the current in-game objective when it conflicts with a video or forum post. Avoid unknown executables, replacement saves, cheats, or destructive file edits offered as shortcuts. A legitimate workaround should be explainable, reversible, and testable without surrendering account credentials or deleting the only known-good save.

Completion check

Finish with “What comes next,” then verify the result in the system that matters: quest log for progression, inventory for items, Steam for achievements, or a repeatable symptom check for a technical fix. Do not treat a visual animation alone as proof that the save registered the event. Wait for a normal transition and inspect the state before selling items, changing hosts, or starting another objective. If the result differs from this page, send the URL, build number, exact steps, and observed result through the contact page; that evidence is how we correct guides without turning uncertain reports into false facts.

Sources & Evidence

Claims are backed by the following sources. Unknowns are marked explicitly.

Frequently asked questions