Money and fast progression
Your cash comes from two places: what a catch is worth when you land it, and what your aquarium pets pay per second while you are online. Upgrade order matters more than play time - grow the pet rack first, then the Mukbang table that lets you dive deeper.
Cash in Harpoon a Fish comes from two very different sources, and knowing which one you are optimising changes the order you should buy things in.
Source one: a catch pays once
Every fish you land has a value, and the catch card shows you what it is worth alongside its species, rarity tag and weight. This is the fast money: it arrives the moment you reel in, it requires you to be diving, and it stops completely when you log off.
The rules that make catch income bigger:
- Depth pays more than rarity. A deep-band common fish usually beats a shallow rare one.
- Bag slots are the multiplier. Catch value per fish times bag slots is your income per dive - which is why the +10 Bag pass at 79 R$ is one of the best-value purchases in the game.
- The last two bag slots are the expensive ones. Surfacing with a full bag early and diving again is usually better than scrounging for one more fish.
Source two: pets pay every second
Put a catch in the aquarium and it starts paying per second, with the HUD showing a per-second figure and a percentage bonus beside it. This is the slow money, and it is the one that decides your ceiling.
Three properties of pet income drive everything else:
- It runs without you. The tank keeps producing between sessions.
- It runs slower without you. The game states that fish grow 20% faster while online, so a pet's earning power climbs faster during a session than away from it.
- It scales with depth, not with effort. A pet caught at 900 m out-earns a shallow one no matter how long you fish the shallows.
Upgrade order: what to buy with the cash you have
| Priority | Purchase | Why |
|---|---|---|
| 1 | Mukbang table levels | Weight, and weight is depth; depth multiplies both catch value and pet quality |
| 2 | Equip slots | More harpoons per shot means contested catches land instead of being stolen |
| 3 | Aquarium upgrades | More pet slots and higher per-second income - worth it once the rack is full |
| 4 | Repeat | Every cycle moves you one band down |
If you only remember one line: buy depth before you buy comfort. An aquarium upgrade on a half-empty tank pays less than the next Mukbang level that lets you fill it.
The free money most players leave on the table
The HUD has claimable rewards, and the game does not nag you about them. The reward strip shows claims waiting, playtime rewards pay XP and potions for simply staying in the session, and time-limited windows such as the game's Hydra exclusive bonus (a flat percentage on offer) are worth claiming before you dive.
The live code is the other free payout: MONSTER pays 3,000 XP and 3 Ruby Keys straight from the official game page, and it takes fifteen seconds to enter. See codes for the exact steps.
A day-one and day-thirty comparison
- Day one: tutorial catches, a handful of shrimp, one pet in the tank, cash in the hundreds. Buy the Mukbang table.
- Day thirty: a full rack of evolved pets paying every second, a bag that carries ten more fish per dive, and dives that reach the deep bands where single catches are worth more than a day-one session. The only thing that changed is the order things were bought in.
That order - depth, slots, pets, repeat - is the entire economy. Everything else on this site is detail.
