The Extended Aquatic Life addon enriches the biodiversity of the water biome, introducing a variety of unexpected creatures to your Minecraft PE world. Sea urchins will rest idly on the ocean bottom, while pelicans gracefully plunge into the sea, attacking to catch fish. Never-before-seen vegetation will now cover the sand like a vibrant green carpet.
In terms of gameplay mechanics, there isn't much to say, except that you can now catch some of these new life forms and use them to feed a pelican.