get it in the temple in shark tooth to get it u need a decoder.
on top of the ancient ruins
open. that's the answer. OPEN.
you have to find the paper that was torn out of the journal and look at it and spell open
on top of the cave in the Ancient Ruins
look at your translation key while you put in the code. what you're supposed to type is OPEN, but you have symbols, so use the translation key. :)
Go on the roof and get the translation key. Go in the temple and use that to go inside. Deep in the temple you should find the secret ingredient. Feed that to the shark.
you don't
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There are two "keys" on Shark Tooth Island, neither of them a real "key" : 1) The "translation key" which is a page from Professor Hammerhead's journal. It shows how the ancient hieroglyphic symbols translate into English. Spelling out the word "OPEN" in these symbols will open the ruins door. The page is on the roof of the ruins. 2) The "key ingredient" is the green substance that make the shark sleping potion work. It is far to the left in the underground ruins. (see related questions)
in the ancient ruins of shark tooth island
you go to the guy who told you to get the stuff
on top of the bulding where the cocanuts fall