If you are not sure what version of the game you are on, the update is for Windows 10, VR, mobile devices, Xbox One and Nintendo Switch. 

The Update Aquatic brings all-new forms of ocean life in a tidal wave of new Minecraft features, including over 3,000 different types of tropical fish, a new weapon called the Trident, which includes four special enchantments – Loyalty, Impaling, Channeling and Riptide –  and many more underwater adventures for the community to embark on. Phase Two features greater improvements to gameplay mechanics, and players can now enjoy the company of turtles alongside their other fishy friends!

For the full breakdown of what the update includes, be sure to check out the full blog post.