Net a Fish’s Fish Collection is built around three decisions: discover new species, keep valuable fish in the Aquarium, and manage duplicates without accidentally selling material needed for fusion. The Fish Index tracks discoveries and collection rewards, the Fish Cooler handles inventory actions, and the Aquarium turns selected catches into passive Cash. The list below is a supported reference to the named fish, variants, and collection systems currently documented; it is not a complete species database.
Fish, variants, and collection systems
The records use “type” carefully. A fish’s species, its rarity, and a Shiny or Gold fusion result are separate concepts. For example, Celestial Mantis is a fish name, Demi-god is its rarity, and Shiny is a fusion variant rather than another base rarity.
| Fish or system | Type | Collection use | How to obtain or use |
|---|---|---|---|
| Jellyfish | Mythic fish | Aquarium display and passive Cash | Catch it with a Fishing Net; keep it if you want a high-rarity display target |
| Goblin Shark | Apex fish | High-value collection and display target | Catch it with equipment capable of handling the required rarity |
| Great Hammerhead Shark | Apex fish | High-rarity display and income | Catch it, then check its Aquarium value before selling |
| Celestial Mantis | Demi-god fish | Very high-rarity collection target | Pursue it with stronger fishing capability and Luck |
| Prism Fin Dragonfish | Fish species | Adds a discovery to the Fish Index | Catch it with a Fishing Net; its complete rarity and income are not documented here |
| Shiny fish | Fusion variant | Improved display result | Fuse 10 fish of the same kind in the Fish Cooler |
| Gold fish | Fusion variant | Higher-tier display and Aquarium income | Fuse 8 Shiny fish in the Fish Cooler |
| Fish Index | Collection system | Records discoveries and unlocks claimable rewards | Check it after catching a new fish |
| Fish Cooler | Storage and management | Equip, sell, sort, and fuse catches | Interact with it at the dock |
| Aquarium | Display and income system | Grows displayed fish and produces passive Cash | Move selected fish from the Cooler into the Aquarium |
| Fisherman | Duplicate helper | Supplies repeats for fusion | Upgrade the Fisherman at the dock to improve duplicate collection |
Use the table as a planning reference, not as a promise that every fish or stat is listed. The documented named catches show the range from Mythic Jellyfish to Apex sharks and a Demi-god Celestial Mantis, while the systems determine what happens after the catch.
What happens after a new catch
A new fish first matters as a discovery. When a catch unlocks a new Fish Index entry, open the Index and claim any available one-time rewards. The documented rewards can include Cash and mutation boosts, so leaving the Index unchecked can delay resources that are already unlocked. The Index is the record of what you have discovered; it is not the place where you perform inventory actions.
The Fish Cooler is the inventory checkpoint. At the dock, use it to inspect catches, sort them by rarity or Odds, equip a fish, sell it, or select fish for fusion. This separation is important: an Index entry can remain recorded even after a fish leaves your inventory, while the Cooler determines which physical copies are available for display or fusion.
Before selling, check three things:
- Is this fish still needed to complete an Index discovery or collection goal?
- Is it one of the same-kind copies needed for a Shiny or Gold fusion?
- Would placing it in the Aquarium provide a better use than its immediate sale value?
Low-rarity fish are not automatically worthless. They can be fusion material, and the collection notes specifically warn against bulk selling before checking fusion needs. If you use Auto-sell, set its rarity range around your current goal rather than assuming every lower-rarity catch can be discarded.
Building an Aquarium collection
The Aquarium is both a showcase and an income system. Move a selected fish from the Fish Cooler into the Aquarium, where it grows from Baby to Adult and produces Cash over time. Growth stage affects income, and rare fish generally take longer to grow, so a rare catch can be a longer-term display investment rather than an instant payout.
A practical display order is:
- Keep a target fish in the Aquarium when you want its passive Cash or want to grow it toward its adult value.
- Reserve duplicate copies in the Cooler when you are working toward fusion.
- Use Equip Best only after checking whether the automatically selected fish consumes a copy you wanted to keep for a collection or fusion target.
- Revisit the Aquarium after upgrades and fusions, because an improved fish can change which display slot is most useful.
The income loop is straightforward: Aquarium fish generate passive Cash, and unwanted fish can also be sold for Cash. Reinvest that Cash into the Fishing Net upgrade path, Spear Gun, Fisherman, Aquarium, and other Fishing Upgrades. This makes collection progress useful even when the next new species is not immediately available.
Fusion and duplicate planning
Fusion converts repeated catches into stronger display candidates. The documented recipe starts with 10 fish of the same kind to make one Shiny fish. A Gold fish then requires 8 Shiny fish. Because both recipes consume their inputs, fusion should happen only after you have checked the Fish Index and decided which copies must remain available.
The Fisherman supports this plan by catching duplicate versions of fish you have already collected. The fishing progression guide explains how this collection loop fits with regular catches. Upgrade the Fisherman at the dock to improve its efficiency and the range of duplicates it can collect. The useful pairing is therefore:
- Catch a new species yourself so the Fish Index records it.
- Keep the discovered species available for display or inspection.
- Upgrade the Fisherman to supply repeat copies.
- Store those repeats in the Cooler until you have the required same-kind count.
- Fuse only when consuming the copies will not interfere with the current collection target.
- Move the finished Shiny or Gold result into the Aquarium when its display and income value fit your plan.
A fusion result should not be confused with a rarity label. Apex and Demi-god describe rarity categories in the documented collection notes; Shiny and Gold describe results of the fusion process. That distinction matters when sorting fish, deciding what to chase, and setting an Auto-sell rule.
Catch, display, and fuse fish
These moments support the collection loop described here: catching fish, moving them into the Aquarium for passive Cash, and using the Fish Cooler and Fisherman for duplicate-fish fusion.
Reaching rarer fish
The collection loop becomes more demanding as you target higher rarities. Fishing results are affected by randomness, Net capability, Luck, and Fishing Upgrades. The Spear Gun is a mounted catching device for fish above Common by default and is required for obtaining the rarest fish in the game, so it becomes important when your goal moves beyond ordinary catches.
Upgrade priorities should follow the fish you are actually trying to collect:
- Improve the Fishing Net when its catching capability is the limiting factor.
- Improve the Spear Gun before pursuing catches that require it.
- Invest in Luck when you are targeting rare outcomes.
- Keep Helpers, including the Fisherman, working on duplicates and supporting collection growth.
- Check available bait: different baits provide limited-time passive bonuses, and some choices are locked behind rebirth requirements.
A higher-tier target may require several systems at once rather than one purchase. The named records illustrate this range: a Mythic Jellyfish is a high-rarity catch, Apex fish such as Goblin Shark and Great Hammerhead Shark are separate collection targets, and Celestial Mantis is documented as a Demi-god target. Do not treat the name “Celestial” as the rarity; the rarity is Demi-god.
Identify and display a Mythic Jellyfish
This moment supports the Mythic Jellyfish collection example by showing the fish being identified and placed in the Aquarium.
Collection limits and mutable details
The supported records cover selected fish and the systems around them, not every entry in the Fish Index. The available collection reference does not provide a complete species list, every fish’s income, exact growth timers, full rarity table, or all fusion tiers. Those details can change as Net a Fish updates, so use the current in-game Fish Index, Fish Cooler, and Aquarium panels for live values.
The same caution applies to selling and automation. Your current Index goals, available Cooler copies, Aquarium growth stage, and Auto-sell settings can change the best decision from one session to the next. When in doubt, sort the Cooler, inspect the fish’s current use, and preserve enough copies for the next known fusion or collection goal before converting anything into Cash.
First-time Net a Fish collection questions
Should you sell a newly caught fish immediately?
No. Check the Fish Index, fusion requirements, and Aquarium use first. A lower-rarity copy can still be needed for a same-kind fusion or collection goal.
What should you upgrade when chasing a rare fish?
Match the upgrade to the target: improve your Net and Luck for better catching capability and odds, and upgrade the Spear Gun when the target is above Common or requires that mounted device. Helpers such as the Fisherman can continue supplying duplicates while you chase new discoveries.
Does Shiny mean the fish has a higher rarity?
Not in the same sense as Mythic, Apex, or Demi-god. Shiny and Gold are fusion results, while those other labels describe rarity categories, so keep the two classifications separate when sorting or selling.
Why keep a fish in the Aquarium instead of selling it?
An Aquarium fish grows from Baby to Adult and produces passive Cash over time. Keeping a fish can therefore support long-term income or display goals, although the best choice depends on its current growth stage and your immediate fusion needs.