Panicked authorities in the city of Gamagori are attempting to track down customers who bought five packages of the incorrectly prepared fugu fish.
Three packages of the risky delicacy have already been located and will be retrieved, but the authorities still don't know where the remaining two are, Takayanagi added.
Toshiharu Hata, a fugu wholesaler in Japan previously told CNN it is traditionally served as transparent paper-thin strips on porcelain pates. But the fish's skin, intestines, ovaries, and liver contain the poison tetrodotoxin, which is 1,200 times deadlier than cyanide.
Three of the five packets sold have so far been found and no one is believed to have been harmed, but concerns are growing over two packets that remain missing.
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Certain parts of pufferfish contain tetrodotoxin.
Many consumers, however, are wary of its reputation and some local authorities have called for a ban on its sale.
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"Eating fugu liver can paralyze motor nerves, and in a serious case cause respiratory arrest leading to death", officials warned.
Chefs in Japan require years of training and a special licence before being allowed to prepare the delicacy, which is typically served as either sashimi (raw fish) or in a hot pot.
"It's a very tasty fish, but that's not the only reason people choose to go to a fugu restaurant", said Shinichi Ueshima, a chef at the Dote restaurant in Yokohama.
In comparison, around 100 people die in the USA every year from vibrosis, which is a disease linked to the eating of raw oysters and shellfish.
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