Bucket of aquatic mob

Buckets of fish are a form of water bucket with a fish inside of them.

Obtaining
A bucket of fish can be obtained by a water bucket on any fish mob. The fish bucket obtained will correspond to the fish picked up. In the Bedrock Edition, an empty bucket can also be used to obtain a fish bucket.

Usage
Pressing with a bucket of fish will place a water source block, and spawn the corresponding fish back into the world, leaving an empty bucket in the player's inventory. For buckets of tropical fish, the patterns and color of the tropical fish are remembered and stored in the bucket. Placing a bucket of fish in the Nether will cause the fish mob to be spawned alone, flopping out of water.

Bucket of tropical fish
Tropical fish also have assigned names which can be seen after capture, so that the buckets are given names like "Bucket of Plum Blockfish", "Bucket of Sky-Orange Snooper" or "Bucket of Orange-Lime Dasher". Their colors are mostly named according to the colored block names, though with a few exceptions:



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

A bucket of tropical fish pulled out of the creative inventory will spawn randomly colored tropical fish when used.

Item data
In bedrock edition buckets use data value to determine contents. Once used, each data value is set to 0 (Empty Bucket). If no data value is provided, data value is 0.

Trivia

 * When a water bucket is transformed into a bucket of fish, it will actually push the bucket texture down one pixel. According to Dinnerbone, Jappa says this is due to the "weight of the fish."
 * Buckets of tropical fish will always appear to contain an orange-white kob, regardless of whatever fish is actually inside.
 * Since empty buckets can be used to capture fish on the Bedrock edition, it is possible to create an infinite amount of water source blocks simply by catching a fish mob with a bucket and continuely placing and re-capturing the mob.