Bucket of aquatic mob

Fish buckets are a form of water bucket with a fish inside of them.

Obtaining
A fish bucket can be obtained by a water bucket on any fish mob. The fish bucket obtained will correspond to the fish picked up.

Usage
Pressing with a fish bucket will empty it, spawning the corresponding fish back into the world, leaving an empty bucket in the player's inventory. For tropical fish buckets, the patterns and color of the tropical fish are remembered and stored in the bucket. Tropical fish also have assigned names which can be seen after capture, such as Grey-Lime Blockfish, Sky-Orange Snooper and Orange-Lime Dasher.

Trivia

 * When a water bucket is transformed into a fish bucket, it will actually push the bucket texture down one pixel. Dinnerbone says this is due to the "weight of the fish."
 * Tropical fish buckets will always have the texture of a clownfish bucket, regardless of whatever fish is actually inside.
 * Empty buckets can also be used for fishing.