Also available in Modrinth:

https://modrinth.com/resourcepack/findreks-3d-buckets-and-fish

Buckets and Fish items become 3D

This pack has texturepack support, which means if another texturepack is installed alongside this one, its textures will also show in this pack's models.

The vanilla textures that are compatible are the following:

Water
Lava
Snow
Cod
Salmon
Cooked Salmon
Pufferfish
Axolotl
Tadpole

Buckets can also be placed in item frames on the ground as decoration, and fish placed on the wall in the form of trophy fish

This pack does NOT require Optifine to work, but it also adds the following extra features if Optifine is enabled (custom items and emissive textures need to be enabled):

The lava in buckets of lava glows (also has texturepack support)

(NOTE: not compatible with other Optifine packs that have emissive textures, if you prefer the other packs to glow instead, place this one below them in the list)

Catching an axolotl in a bucket will display its variant color and its age stage (also has texturepack support)

If the axolotl's health is below half, it'll display a hurt pose instead

Catching a tropical fish in a bucket will display its variant color (only if it's one of the 22 common named fish in Java Edition)

Fish that aren't any of these 22 are instead displayed as colorless, with the shape of the respective caught fish

Renaming a tropical fish item to one of the common fish names will give you its respective variant

The 22 Java Edition common tropical fish and their names, for reference:

I'll be posting updates on Tumblr

(Please do not repost the zip file to other websites, sharing and linking back is appreciated)

Findrek's 3D Buckets and Fish