he could sense the 9-tails in naruto
all biju can relate to each other in some way or another and he must have noticed it from narutos action.
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Episode 144 or 145 i think
It doesent matter anymore , Utakata is dead ....
Naruto finds about the death of Jiraiya in Naruto Shippuden 152 " Sad News "
Yes, Utakata, the 6 tails jinchuuriki, is dead. He died when he got his six-tailed beast extracted from him. Once the demon is removed from the host, they die. He was captured by Pein of the Akatsuki.
When there is a bubbly orange thing surrounding Naruto. When he actually starts transforming, he becomes a solid red color.