Big Fish and You - Patch 2.3

[Lyn]

I'm sorry for asking something that's probably second nature to all you FSH, as I'm saving my FSH for last, but am wondering what exactly do you do with all of these rare, untradable fish? What is the point, what are they used for? Thanks in advance!

Before 2.3 there were no use for them. Now they can be used in culinary desynth and some swimwears are coming from it so there's a point selling them on Market Boards or desynthing them yourself if you're high enough. You can also get Clear Demi Materia by desynthing them, no purpose but can be sold for more gil than fishes to npc.