Fish Tail
TrinketAfterbirth+Unlocked
How do you unlock Fish Tail?
Verified starting unlockSource data confirms that no unlock is required.
Items and trinkets that generate Blue Flies or Locusts will generate twice as many.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Fish Tail leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13