Fisch illustration of a split view above and below the water: a blocky fisherman in a small boat on the surface while a huge glowing crystal-blue fish rises from the deep toward the bait
Illustration: AI-generated artwork, not a game screenshot
Fish Rankings

What Is the Rarest Fish in Fisch?

The rarest fish belong to the Divine Secret rarity: 11 fish with fixed odds that luck cannot change. Here they are, ranked, with what each one takes.

By FischCalculator Teamβ€’Checked against the Fisch Wiki on October 10, 2026

Quick Answer

The rarest fish in Fisch are Him and the Boulder, both at a fixed 1 in 1,000,000 chance per catch. Him can bite in any water; the Boulder only at Keepers Altar. Next come the Forbidden Plesiosaur in Tidefall and the Seraphfin, again in any water.

#1 (tied)
Him
1 in 1,000,000
Any water
#1 (tied)
Boulder
1 in 1,000,000
Keepers Altar
#3
Forbidden Plesiosaur
1 in 500,000
Tidefall
#4
Seraphfin
1 in 250,000
Any water

All 11 Divine Secret Fish, Rarest First

The odds are the chance per catch that the Fisch Wiki lists for each fish. A better rod, bait or potion does not change them.

#1 Him

1 in 1,000,000 (0.0001%)
Where
Any water
Average sale
C$ 2,500
XP
5,000
50% chance by
693,147 catches

#1 Boulder

1 in 1,000,000 (0.0001%)
Where
Keepers Altar
Average sale
C$ 10
XP
50,000
50% chance by
693,147 catches

#3 Forbidden Plesiosaur

1 in 500,000 (0.0002%)
Where
Tidefall
Average sale
C$ 45,667
XP
18,500
50% chance by
346,574 catches

#4 Seraphfin

1 in 250,000 (0.0004%)
Where
Any water
Average sale
C$ 30,003
XP
20,000
50% chance by
173,287 catches

#5 Razorfin

1 in 25,000 (0.004%)
Where
Castaway Cliffs
Average sale
C$ 30,003
XP
20,000
50% chance by
17,329 catches

#6 Paradox Piranha

1 in 20,000 (0.005%)
Where
Lost Jungle
Average sale
C$ 30,003
XP
20,000
50% chance by
13,863 catches

#7 Crustal Colossus

1 in 15,000 (0.0067%)
Where
Sunstone Island
Average sale
C$ 30,003
XP
20,000
50% chance by
10,397 catches

#7 Lumilotl

1 in 15,000 (0.0067%)
Where
Desolate Deep (Desolate Pocket)
Average sale
C$ 30,003
XP
20,000
50% chance by
10,397 catches

#7 Tuskmaw

1 in 15,000 (0.0067%)
Where
The Ocean
Average sale
C$ 30,003
XP
20,000
50% chance by
10,397 catches

#10 Aetherfin

1 in 10,000 (0.01%)
Where
Roslit Bay
Average sale
C$ 30,003
XP
20,000
50% chance by
6,932 catches

#10 Cataclysm Carp

1 in 10,000 (0.01%)
Where
Moosewood
Average sale
C$ 30,003
XP
20,000
50% chance by
6,932 catches

Source: each fish's Fisch Wiki page, checked October 10, 2026. Average sale uses the wiki's base value and weight with the same formula as our calculators; a heavier or lighter catch sells for more or less.

Rare does not mean valuable. The Boulder has a fixed weight and sells for C$ 10; it is worth catching for its 50,000 XP and its serial number. Him averages C$ 2,500. The Divine Secrets from 1 in 10,000 to 1 in 250,000 average C$ 30,003, and the Forbidden Plesiosaur C$ 45,667.

How Many Catches Does a Divine Secret Take?

Pick a fish and the number of catches you plan to make at its spot. The calculator gives your chance of landing at least one, and how many catches an even chance and a 90% chance take.

Chance of at least one in 5,000 catches
39.3%
Catches for a 50% chance
6,932
Catches for a 90% chance
23,025

The odds are fixed, so every catch is a new 1 in 10,000 try for the Aetherfin: earlier catches do not make the next one more likely. A roaming Aetherfin near your bobber is the exception (see below).

The average is easy to misread. 1 in 10,000 means 10,000 catches on average, yet after 10,000 catches about 37% of players still have none. A 90% chance takes 23,025 catches.

How to Improve Your Chances

  • Fish where it lives, and land fish fast. Luck does not change the odds, so what counts is the number of catches you make at the fish's spot. Him and the Seraphfin can bite anywhere, so every catch is a try for them.
  • Follow the sound of a roamer. Divine Secrets can also appear as roaming fish, at a tenth of their normal rate: a Tuskmaw, for example, has a 1 in 150,000 chance to spawn as a roamer in the Ocean. A roaming Divine Secret plays its catch sound over and over, and you can hear it up to 1,000 studs away. Get your bobber within 8 studs of it and its chance goes up 1,000 times; for an Aetherfin, from 1 in 10,000 to about 1 in 10. Roamers despawn after two to four minutes, once a player starts reeling one no one else can interact with it, and no Divine Secret roams in the first 10 minutes of a new server.
  • Fish through a Divine Dream. During this two-minute admin event every Divine Secret can bite anywhere at ten times its usual odds. Only admins can start it, so when its server notice appears, start fishing.

How Divine Secrets Work

  • Every one is numbered. Each catch gets a serial number based on when it was caught worldwide, and the fish's bestiary entry shows how many have been caught in total. They are not needed to complete any bestiary.
  • No shortcuts. The passives of the Rod Of The Forgotten Fang, Rod Of The Eternal King and Rod Of The Depths cannot catch them. Duplication from a Glitched Potion, the Lucid Rod or the Anomalous enchantment does not copy them; you get a random fish from the area instead.
  • Mella turns one into a rod upgrade. At the Sunken Reliquary, with the Requis, Thalass and Tide essences on her pedestals, Mella normally takes an Exotic and a Secret fish and changes your equipped rod's stats by anywhere from -5% to +25%. Offer a Divine Secret instead and the roll is +15% to +25%, always higher than the rod's current infusion, and the essences are not used up; the Divine Secret is. The percentage applies to the rod's base stats, not its enchantment, and replaces any earlier infusion on that rod.

Other Very Rare Fish

Below Divine Secret, the rarest tiers you will meet are Secret and Apex. Secret fish are not needed for bestiaries either, and many of the best known appear only during hunts: the Scylla in the Scylla Hunt, the Ancient Kraken in the Ancient Kraken Hunt at Atlantis, and the Ancestral Abaia in its hunt at Skycrest. Many Apex fish come from Apex Hunts, timed events that can have a global stock: only so many of the featured fish can be caught across all servers. Look any of them up in the fish database.

Frequently Asked Questions

What is the rarest fish in Fisch?

Him and the Boulder. Both are Divine Secret fish with a fixed 1 in 1,000,000 chance per catch: Him in any water, the Boulder only at Keepers Altar. Next come the Forbidden Plesiosaur in Tidefall (1 in 500,000) and the Seraphfin in any water (1 in 250,000).

What are Divine Secret fish?

The rarest rarity in Fisch, with 11 fish. Each has a fixed chance per catch that luck does not change, every catch gets a serial number, and the bestiary shows how many have been caught worldwide. They are not needed to complete any bestiary.

Does luck help you catch Divine Secrets?

No. Their odds stay the same whatever rod, bait or potion you use. Two things do help: a roaming Divine Secret within 8 studs of your bobber has its chance multiplied by 1,000, and during the Divine Dream admin event every Divine Secret can bite anywhere at ten times its usual odds.

Which Divine Secret is the easiest to get?

The Aetherfin and the Cataclysm Carp, at 1 in 10,000 each: the Aetherfin at Roslit Bay and the Cataclysm Carp at Moosewood. That is 10,000 catches on average, and 6,932 catches for an even chance of one.

How much is Him worth in Fisch?

C$ 2,500 on average, with 5,000 XP. Him is rare, not valuable: the Divine Secrets from 1 in 10,000 to 1 in 250,000 average C$ 30,003, and the Boulder sells for C$ 10.

What can you do with a Divine Secret?

Sell it, keep it, or give it to Mella at the Sunken Reliquary. With her three essences on the pedestals, she takes the Divine Secret in place of the usual Exotic and Secret fish and raises your equipped rod's stats by 15% to 25%, always above its current infusion. The essences stay; the fish is used up.

Can you duplicate a Divine Secret?

No. A Glitched Potion, the Lucid Rod or the Anomalous enchantment gives you a random fish from the area instead. The passives of the Rod Of The Forgotten Fang, Rod Of The Eternal King and Rod Of The Depths cannot catch them either.

Sources

Fisch Wiki, checked October 10, 2026: Divine Secret, Roaming Fish, Mella, Divine Dream, Secret, Events, and the page of each fish above. Game updates can add Divine Secrets or change their odds.

Correction: an earlier version of this page ranked fish that are not in the game, with odds and hours of play we cannot back up. It has been rewritten from the Fisch Wiki.