Give the Beer to the lighthouse keeper to receive the Empty Beer Can. Give the beer to the lighthouse keeper to receive the empty can
Buy the $3 Crab Fishing Rod if you do not have one, then install the Empty Beer Can on it. Install the empty can on the Crab Fishing Rod
Combat preparation
Buy the $45 Knife; the Spider Crab fight is melee, and the knife is much stronger than fighting with your fists.
No guns are sold on the first island, so do not wait for a firearm before attempting this boss.
Carry a few creatures in your inventory and eat them to restore health after taking a hit.
Boss fight walkthrough
Move the Spider Crab onto dry ground after it is hooked. Wait for it to charge, step to the side, and attack its back while it is stunned at the end of the charge.
Move aside when the Spider Crab charges
Keep the Spider Crab away from the water whenever possible. Contact with water allows it to jump much higher, which makes its next attack harder to avoid.
Watch the fight
Recordings from other players, picked for the method each one shows. Nothing is loaded from YouTube until you press play.
How To Fish: How To Catch & Beat The Spider Crab | First Island & Boat Keys (Prologue Guide)
Walks the whole prologue in order: buy the beer, trade it for the empty can, install it on the rod, hook the crab, fight it, then hand the shell in for the boat keys. Best first watch if you have not started the fight yet.
How to Beat the Spider Crab First Boss How to Fish
The same fight done with nothing but the knife, including the $12 beer trade for the empty can. Watch this one if you would rather not spend money on gear before the first boss.
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Drops after victory
Quest items have a base sale price of $0 and should be kept for the island objective. The number of meat chunks increases with the number of players: three in solo play and one additional chunk per extra player, up to six with four players. Prices below are base values before other multipliers.
Drop
Quantity
Base sale price
Use
Spider Crab Shell
1
$0
Required quest item. Give it to the lighthouse keeper to receive the boat keys.
Meat Chunk (crab)
Player count + 2 (3 solo; 6 with four players)
$10
Can be sold or eaten, but it does not complete the island objective.
Objective after the fight:Keep the Spider Crab shell and give it to the lighthouse keeper to receive the boat keys. Meat chunks do not complete the objective.
Pick up the shell separately after defeating the Spider Crab
Quick answers
How do I summon the Spider Crab?
Give beer to the lighthouse keeper, install the empty beer can on the Crab Fishing Rod, and cast into the water.
What do I hand in after defeating the Spider Crab?
Keep the Spider Crab shell and give it to the lighthouse keeper to receive the boat keys. Meat chunks do not complete the objective.