This add-on includes the mob and blocks which are expected to be released in the Aquatic Update. The designs for this add-on are concepts and should not be seen as official. However, they should be somewhat similar seeing as they are based on teaser screenshots provided by Mojang. The new features include things like corals, dolphins, fish entities, turtles and more!
This is not an official Mojang product, and is not affiliated with Mojang AB in any way. The Minecraft Name, the Minecraft Brand and the Minecraft Assets are all property of Mojang AB or they respectful owner. This app follows the appropriate use guidelines at https://account.mojang.com/documents/brand_guidelines