Krakana were aquatic creatures that lived on Mon Calamari[1]. They were believed by many to be some of the most dangerous creatures on the planet. A krakana had tentacles tipped with deadly pincers, could swim at high speeds, and had several rows of sharp teeth. They were relatives of the keelkana[1].
When Han and Leia Solo were on vacation to Mon Calamari, with their family, Leia told her son, Anakin Solo, not to play in the water because of the Krakana. Later Anakin would use that excuse whenever his siblings told him not to go somewhere by responding "See it's okay, no Krakana!"