Fish Tail

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Fish Tail is a trinket added in The Binding of Isaac: Afterbirth †.

Effects

Many items and trinkets that generate Blue Flies or Locusts will generate twice as many.

Notes

Flies may spawn on top of each other, appearing as a single fly initially.

Synergies

Blue Fly / Locust sources that are doubled:

Other notable interactions:

Compost: Isaac will gain twice as many flies per use, meaning each fly will be tripled.
Beelzebub: Blue flies generated will be doubled, but charmed flies will not be doubled.
Rotten Baby: Will spit two flies at a time with one being a copy. Will only spawn more flies when the original fly is destroyed.
Parasitoid: The duplicated flies will spawn on top of the enemy and deal damage immediately.
Tainted ??? / IBS: Blue flies created by corny poops will be duplicated when spawned in, but not when the poop is broken.
Keeper / Tainted Keeper: Blue Flies created from hearts will be doubled.