"The Isonade is a sinister creature that is assumed extinct. They are seeming to be a dream that is possible to be caught and captured. They only circle near Strange Whirlpools, they can even be the cause for one."
– Bestiary Entry
Overview
The Isonade is a Mythical fish obtainable when fishing near Strange Whirlpools. Due to its high rarity, it makes for a challenging catch, moving erratically across the fishing bar. When catching, a -50% progress speed decrease is inflicted on the player.
When hooked, a 
will pop above the player's head, and a bell sound is played - as with all Mythical fish.
The Isonade is required for the Vertigo bestiary, but can't be caught in Vertigo.
Gives 1200XP when fished (Base).
Trivia
- The Isonade is based off of a Japanese yokai/legend.
- Isonade is actually pronounced as "Eee-so-nah-dey".
- The Isonade has an almost identical model as the Great White Shark.
- The Isonade is required to complete the Vertigo's bestiary, but can't be caught in it.
Catch Quips
When catching an Isonade, There will be one of the following exclamations:
- WOAH!! I CAUGHT AN ISONADE!
- AN ISONADE??
- HOLY.. AN ISONADE??
- I CAN'T FEEL MY SPINE!!
- THESE EXIST?
