Bucket of aquatic mob

Buckets of mob are a form of a water bucket with a mob inside.

Obtaining
A bucket of mob can be obtained by a water bucket on any mob. Once an empty bucket or a water bucket is used, the mob is picked up along with the water source block. The mob bucket obtained corresponds to the mob picked up.

Trading
Wandering traders have $1/6$ chance to either sell a bucket of pufferfish or a bucket of tropical fish for 5 emeralds.

Novice-level Fisherman villagers have a 50% chance to sell a bucket of cod for 3 emeralds.

Usage
Pressing with a bucket of mob places a water source block, and spawns the corresponding fish or axolotl back into the world, leaving an empty bucket in the player's inventory. For buckets of tropical fish, the fish and its details (color, size, name) are kept. Placing a bucket of mob in the Nether causes the same particles to appear that generate when a normal water bucket is placed in the Nether, and the fish is spawned alone.

Mobs caught in buckets then released do not despawn, unlike mobs that spawn naturally in oceans.

If a bucket of mob is inside a dispenser, the dispenser spawns the mob and water block in front of it upon activation.

If a bucket of mob is named a certain name through an anvil, the mob inside display that name as if it were named with a name tag, making fishes and axolotls the only mobs that can exist in item form, and be named without a name tag. Alternatively, if a named fish is captured with a bucket of water, the resulting fish bucket shares a name with the captured fish.

Bucket of tropical fish
Tropical fish also have assigned names that can be seen after capture, so that smaller text under the item name is displayed showing the fish name, similar to the text that displays enchantments under enchanted items. Their colors are mostly named according to the colored block names, though with a few exceptions:



The base color comes first, and if the pattern color is different, it comes after that. Lastly, the fish bucket is given a name according to the shape and pattern of the fish:

Some tropical fish don't follow the normal naming system, and instead, reference real-life fish species. Apart from these names, these types of fish aren't different from regular tropical fish in terms of design or behavior.

These varieties are:

A bucket of tropical fish purchased from a wandering trader or pulled from the Creative inventory spawns random tropical fish when used, due to it having no associated NBT.

Bucket of axolotl
$$, if an axolotl is picked up with a bucket, the bucket appears in the player's inventory as "Bucket of   Axolotl" based on the age and color of the axolotl. These varieties are:
 * Bucket of Baby Lucy Axolotl
 * Bucket of Adult Lucy Axolotl
 * Bucket of Baby Brown Axolotl
 * Bucket of Adult Brown Axolotl
 * Bucket of Baby Gold Axolotl
 * Bucket of Adult Gold Axolotl
 * Bucket of Baby Cyan Axolotl
 * Bucket of Adult Cyan Axolotl
 * Bucket of Baby Blue Axolotl
 * Bucket of Adult Blue Axolotl

When the player spawns in an axolotl with a Bucket of Axolotl from creative inventory, it has a randomized color due to it having no associated NBT.

The bucket of axolotl does not change textures in the inventory.

The cannot give the player these varieties. The player needs to pick up a spawned axolotl to get the variety buckets.

ID




Item data

 * The item's tag tag.

Normal buckets of fish use only the BucketVariantTag tag to store the variant of any tropical fish that is picked up, and the item's display name to store the fish's custom name.

Trivia

 * When a water bucket is transformed into a bucket of mob, it actually pushes the bucket texture down one pixel. According to Dinnerbone, JAPPA says this is due to the "weight of the fish".
 * Buckets of tropical fish always appear to contain a clownfish, regardless of whatever fish is actually inside.
 * Since empty buckets can be used to capture fish or axolotls $$, it is possible to create an infinite amount of water source blocks simply by catching a fish mob with a bucket and continually placing and re-capturing the mob.
 * The bucket of cod and bucket of tropical fish are actually re-colors of each other.