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Island 1 boss route

How to Beat the Spider Crab Boss in How to Fish

Buy the beer, give it to the Lighthouse Keeper and use the returned Empty Can as bait. Bring an upgraded Knife, sidestep the Spider Crab's charge, strike while it is stunned and hand the shell back to receive the boat keys.

Launch-week multisource routeChecked 2026-08-28
A How to Fish player landing a fish while another player holds a weapon on a tropical island
Prepare the Island 1 arena and melee weapon before spending the Empty Can trigger.Dazed Games / Steam
Start here

The short answer

  • Buy the beer on Island 1 and give it to the Lighthouse Keeper to get the Empty Can back.
  • Upgrade the Knife before the summon; basic punches are not a reliable boss plan.
  • Equip the Empty Can as bait and cast only after clearing a flat fighting area.
  • Bait the charge, sidestep it, land a short melee combo during the stun and repeat.
  • Take the Spider Crab shell to the Lighthouse Keeper for the boat keys, then buy the Radar before leaving.

Get the Empty Can without losing the quest thread

The Empty Can is the boss bait, not rubbish to sell. Finish shopping before you cast so the encounter does not begin while you are holding an unprepared weapon.

  1. 1

    Catch and sell enough ordinary Island 1 creatures to buy the beer and a Knife upgrade.

  2. 2

    Give the unopened beer to the Lighthouse Keeper and keep the Empty Can he returns.

  3. 3

    Move away from clutter, restore health and equip the Empty Can on the Crab-Fishing Rod.

  4. 4

    Cast from shore and be ready to switch to the Knife when the Spider Crab reaches land.

Dodge the charge, then punish the stun

Do not chase the crab during recovery or empty the whole stamina window into one attack. The safe pattern is a readable charge followed by a controlled punish, not a continuous melee trade.

  1. 1

    Stay close enough to invite a ground charge instead of a long, erratic jump.

  2. 2

    Wait for the forward rush, then move sideways rather than backing straight away.

  3. 3

    Turn immediately and land a short Knife combo while the crab is stunned.

  4. 4

    Create space before it recovers and repeat the same bait-and-dodge loop.

Turn in the right item and leave Island 1 ready

  1. 1

    Pick up the Spider Crab shell or body after the fight and return it to the Lighthouse Keeper.

  2. 2

    Collect the boat keys and buy the nearby Radar before getting into the wooden boat.

  3. 3

    Open the Radar and follow the green destination marker to Island 2.

  4. 4

    If the hand-in does not advance, drop other catches and present the boss item again before reloading.

Start the next island without wasting upgradesUse the first-hour spending and save checklist before the next boss route.

Failed-attempt checklist

  1. 1

    No boss on the hook: confirm the bait slot shows Empty Can, not the original beer or Hot Dog bait.

  2. 2

    Dying during the first rush: upgrade the Knife, heal and move the cast point to open ground.

  3. 3

    Crab keeps jumping: stay at medium-close range and stop running across the island.

  4. 4

    No boat keys: return the boss shell to the Lighthouse Keeper and clear ordinary loot from your hands.

Sources used on this page

Community observations are useful leads, but they are not official drop probabilities.

Current editorial walkthroughGamesRadar+ — full How to Fish walkthroughIndependent editorial routeDestructoid — Lighthouse Keeper culprit routeOfficial game and mediaHow to Fish on Steam