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Harpoon a Fish Wiki

Aim your harpoon, time your reels, and catch strange sea monsters. Steal contested catches from other players, build your collection, and evolve aquarium pets.

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Fishing Guides
First-person view of aiming a harpoon at a giant spiky sea monster underwater in Harpoon a Fish
Aim-and-reel catchesPlayer fish stealing1,800+ unique fishSea-monster evolution

Working Harpoon a Fish Codes

The current code is MONSTER: +3,000 XP and 3 Ruby Keys, redeemable from the Settings menu.

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How to redeem
MONSTER
Tested active
+3,000 XP+3 Ruby Keys

Source checked:

Explore the Wiki

Six sections, one per task: learn the harpoon loop, redeem the current code, raise aquarium pets, fill your fish index, plan your Robux, and follow game updates.

Fishing

Learn the harpoon loop from your first catch to contested reels, with step-by-step guides for new and improving players.

Codes

Check the current working code, what it pays out, and the exact Settings steps to redeem it in-game.

Aquarium

Turn catches into pets: place your fish, grow it fat and big, and evolve it toward the rarest sea monster.

Fish

Fill your fish index species by species, and see who wins when players compete for the same trophy catch.

Progression

Compare every gamepass before you buy, and open crates with keys for spears, XP and bonus keys.

Update

See what changed in Harpoon a Fish, with dated entries added as game updates are verified.

What Is Harpoon a Fish?

Player harpooning a two-headed shark sea monster with red tentacles in Harpoon a Fish

Harpoon a Fish is a Roblox simulation built around an ocean full of unusual creatures. Getting fatter lets your character sink into deeper water where new sea monsters appear, and your aquarium turns collected catches into pets you keep raising toward the biggest, rarest sea monster.

Learn How to Play

Developer

FirstTry

Platform

Roblox

Genre

Simulation

Core Loop

Aim, reel, and dive deeper

Competition

Contested trophy catches

Collection

1,800+ unique fish

Aquarium

Raise catches as pets

Max Players

6 per server

Latest Guides

Fishing Guides

Start Playing Harpoon a Fish

The whole loop from your first harpoon shot to a growing aquarium pet, using the game's own How To Harpoon steps.

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  1. Aim at a fish and FIRE

    Start your first catch

  2. Time your reels to pull the fish in

    Land the catch before it escapes

  3. Put the caught fish in your aquarium

    Keep it as a growing pet

  4. Get fat and sink deeper

    Find new and rarer sea monsters

  5. Evolve your fish

    Grow the biggest and rarest monster you can

How to Catch Fish

Aim, fire, and time the reel — the skill check that turns a fired harpoon into a caught fish.

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Repeatable gameplay cycle

  1. Aim and FIRE

    Point the harpoon at your target and shoot.

  2. Time your reels

    The timed reel is the skill check — mistimed reels on fast fish fail.

  3. Fish reaches your aquarium

    A fish placed in the aquarium marks a completed catch.

Repeat the sequence for the next target — every catch ends with the fish in your aquarium.

Related observations

Contested catches

Another player can harpoon the same fish — only one player catches it.

Aquarium Basics: From Catch to Pet

What happens after the catch: place your fish in the aquarium, grow it as a pet, and evolve it.

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Step 1

Catch a fish

Aim, fire, and time the reel to land it.

Step 2

Put it in your aquarium

The game's own how-to ends its route here.

Step 3

Grow your new pet

Placed fish keep growing in the aquarium.

Step 4

Evolve it

The long-term goal: the biggest and rarest sea monster.

How to Grow Your Fish

Growth happens in the aquarium over time — fatter fish sink deeper, and store passes can speed it up.

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Growth happens in the aquarium

Placed fish get fat and big over time.

Fat opens the deep

A fatter fish sinks deeper, where new sea monsters live.

Shorten the wait

The store lists a -50% Grow Time pass at 349 Robux.

Boost fat gain

A 2x Fat pass is listed at 249 Robux.

Fill Out Your Fish Index

The index tracks 1,800+ unique fish, and every catch records its species toward completing it.

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Your index tracks over 1,800 unique fish, and each species you catch records its entry.

  • To fill a missing entry, harpoon that fish: aim, fire, and time the reel.
  • Deeper water holds rarer sea monsters — along with more danger.

Trophy Catches and Stealing

When two players hook the same fish, only one lands it — harpoon a rival's catch to steal the trophy.

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Choose for your situation

Another player is fighting the same fish

Harpoon their fish to steal it — but only one player lands the trophy, so a contest is never guaranteed.

The fish is yours alone

Aim, fire, and time your reels to bring it in.

Harpoon a Fish Gamepasses

Five passes are on sale, all added within the past month — here are the named ones and what the full set costs.

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New · Oct 13

2x Fat

Listed at 249 Robux; the listing names the effect: doubled fat.

New · Oct 3

-50% Grow Time [PERMANENT]

Listed at 349 Robux; per its own listing it halves growth time.

All five passes

The full set lists at R$ 1,125 total, with a median pass price of R$ 249.

Frequently Asked Questions

Quick answers about the current code, game changes, and landing your first catch.

The codes table lists the current code with its rewards, status and check date, plus the Settings steps to redeem it.Open Codes

Aim your harpoon at a fish and fire, then time your reels to pull it in — a fish in your aquarium means the catch is complete.Open the catching guide

Verified changes are recorded on the dated update timeline.Open Game Updates

Ready for Your Next Dive?

Grab the current code, learn the harpoon loop, and see what changed before heading into deeper water.

Open CodesPlay on Roblox