With this DLC you'll unlock:

• your own seal that follows you everywhere!
  
• active bonus that increases the speed at which you catch fish in the sea
  
• secret fish you can feed to earn beauty cup points
  
• new fishbowl decoration
  
• 100 gems
  

Have fun with your new pet, take care of your new fish, decorate the aquarium, spend your gems on various upgrades and enjoy the bonus!