A fish bucket generally resembles other types of buckets, but with light blue for water and an orange and white fish tail protruding. (A shark bucket shows a different colored tail, a bucket of water shows no tail, and an empty bucket shows black shadow.)
When emptied by tapping on an open location, an empty bucket is returned to the Blockhead's inventory. A fish and block of water are placed in the location tapped.
The only known uses for a fish bucket are transporting a fish to a new location and looking interesting on a shelf.