5 fish at Second Sea. The most valuable is Phantom Koi, up to 100,184 C$ at its heaviest with no mutation. Prices below are the lightest and heaviest weight with no mutation.
Most valuable fish at Second Sea
- #1 Phantom KoiExtinct · up to 100,184 C$ · 14 C$/kg
All 5 fish at Second Sea
| Fish | Rarity | C$ / kg | Weight (kg) | Sells for (C$) |
|---|---|---|---|---|
| Phantom Koi | Extinct | 14 | 216–7,156 | 3,024–100,184 |
| Brimstone Angler | Mythical | — | — | — |
| Pine Zephyrfish | Extinct | — | — | — |
| Thornfish | Secret | — | — | — |
| Tropicspike | Extinct | — | — | — |
Fishing at Second Sea
The table is sorted by what each fish sells for at its heaviest weight, so the fish worth chasing are at the top. A fish with a low price per kg can still beat a pricier one if it grows much heavier. Open a fish for its mutation price table, or put your own catch into the sell calculator.
Looking somewhere else? See all Fisch locations.
Frequently asked questions
How many fish can you catch at Second Sea in Fisch?
Fisch Wiki lists 5 fish for Second Sea: 1 Mythical, 1 Secret, 3 Extinct.
What is the most valuable fish at Second Sea?
Phantom Koi, which sells for up to 100,184 C$ at its heaviest weight (7,156 kg) with no mutation.
Data from Fisch Wiki (fisch.fandom.com), licensed CC BY-SA 4.0. We reformatted it and added the calculations. Last synced Nov 11, 2026. In-game prices can change with each update, so treat the game as the final word.