Sea Pickle

Sea pickles are light-emitting colonies of small stationary animals found underwater.

Obtaining
A sea pickle colony will break instantly and drop itself as an item if broken using anything, or if the block below it breaks, dropping as many pickles as there are on the block.

Natural generation
Sea pickle colonies generate on the bottom of warm ocean and lukewarm oceans. They can also be found on top of coral blocks. Each chunk has $1/6$ chance to generate sea pickle colonies.

Two sea pickles can be found in one of the desert village small house.

Bone Meal
Using bone meal on a coral block will create sea pickles.

Trading
Sea pickles are sold by wandering traders for 2 emeralds.

Usage
Sea pickles can be placed on top of most solid blocks, as well as non-solid blocks, up to four per block, similarly to turtle eggs. More information regarding placement on transparent blocks can be found at Opacity/Placement.

Sea pickles produce light when underwater. A single pickle produces a light level of 6, and a colony produces an additional 3 levels per pickle (so 4 sea pickles produces a light level of 15). When they produce light, there is a pale green glow at the end of the pickle.

Bone meal can be on sea pickles if they are underwater, and planted on living coral blocks. This will increase their number on that block, and spread to empty areas underwater above other living coral blocks. They can spread to the original sea pickle's level or one level below, out to a horizontal taxicab distance of 2. Bone meal can be used on sea pickles planted on other blocks, or outside of water, but nothing will happen and the bone meal will still be consumed.

Composting
Placing a sea pickle into a composter has a 65% chance of raising the compost level by 1.

Block data
Bedrock Edition uses the following data values.

Trivia

 * They appear to be based on Pyrosomes, real-life tunicates with blue-green bioluminescence. They are also commonly called sea pickles, which is where the name likely came from.