Java Edition 18w10a

18w10a is the twenty-fourth snapshot released for 1.13, which added tropical fish and its corresponding fish bucket, added coral plants, added buried treasure and its exploration map, gave players the ability to put markers on maps, changed the textures and models of many blocks, items, and mobs, and fixed a few bugs.

Blocks

 * Coral plant
 * Blue coral plant, pink coral plant, purple coral plant, red coral plant, and yellow coral plant.
 * Can only be placed underwater.

Items

 * Tropical fish bucket
 * Tropical fish spawn egg
 * Buried treasure exploration maps
 * Found in underwater ruins chests.
 * Leads the player to buried treasure.

Mobs

 * Tropical fish
 * Has 3072 different combinations of shape, color, and patterns.
 * Can be caught in a bucket. The fish variant is stored.
 * Found in warm and lukewarm oceans.
 * Drops clownfish.

World generation

 * Buried treasure
 * Has its own  loot table.
 * Buried treasure explorer maps can lead you to them.

General

 * Ability to put markers on maps.
 * Right click on a banner with a map to add it to the map.
 * Right click on the same banner again to remove it.
 * That map will show the base color of the banner at that spot.
 * Named banners will show their name on the map.
 * If a banner is destroyed, it will disappear when you get close while holding the map.
 * Uses the new  nbt for maps.
 * boolean for sounds.json.
 * When true, the game will load the sound file when loading the pack instead of when the sound is played. Defaults to.


 * Sounds
 * Underwater environment
 * Entering water makes a new sound.
 * Exiting water makes a new sound.
 * A looping sound has been added underwater
 * There are two additional sounds to this sound
 * One is rare, from it you can barely hear whales, jaw closing, and earth crack sounds.

Blocks

 * Kelp
 * Changed the texture slightly.
 * Coral
 * Changed the coral texture (except for dead coral).
 * Each color has a different texture

Items

 * Trident
 * Changed the trident's display model in the inventory.

Mobs

 * Phantom
 * Changed the phantom's model and texture.

Command format

 * Tags
 * Added the block and item tag.
 * The  block tag now includes coral plants.

General

 * Underwater visibility now changes per biome.

Video
Video made by slicedlime:

Trivia

 * Unlike most of the first-of-the-week snapshots, this was released on a Tuesday instead of Wednesday.