This datapack allows you to collect all 2700 tropical fish variants in Minecraft with a "fishdex" on advancements gui.
If you catch e'm all, you gained 2700 levels for completing this datapack.
Global advancement tab
For better experience, please use the "All Tropical Fish Collection"
Mod like Better Advancements (Forge) or Advancements Enlarger (Fabric) is recommended to enlarge the size of the advancement GUI.