Jabun

Jabun is a giant fish who is the Water Spirit. He can only speak Ancient Hylian. He used to live at Greatfish Isle. Before Greatfish Isle was destroyed, he sensed Ganondorf coming and fled to Outset Island. Then, the King of Red Lions and Link came in his cave. Before they left, he gave Nayru's Pearl to Link.

It is possible that Jabun is Jabu Jabu whose name is now pronounced differently when spoken with the new language. If this is the case, then he would know the whereabouts of the Zora, or at least what happened to them, for he was their guardian deity. Perhaps they once lived at Greatfish Isle under his watch. However, rumor has it that they evolved into the Rito (which possess a similar name to the Zora Sage, Ruto, and if so, then perhaps Jabun (Jabu Jabu) transformed the Zora into the Rito for survival [and perhaps acceptance] purposes and named them after Ruto. Then of course, through the evolution of the Hylian language, they became the Rito, rather than the Ruto.