Three of the potentially lethal specimens have been located, but the other two remain at large, local official Koji Takayanagi said.
Local officials have warned the population not to eat blowfish until the missing portions are recovered.
Three packages of the unsafe delicacy have already been located and will be retrieved, but the authorities still don't know where the remaining two are, Takayanagi added.
"We are calling for residents to avoid eating fugu, using Gamagori city's emergency wireless system", he told AFP.
Jeremy Corbyn: Our relationship with United States not that special
Jon Lansman - the arch leftie founder of the Momentum campaign group - beat off comic Eddie Izzard for a slot on the NEC. Mr Lansman said he was "really honoured" to represent nearly 600,000 members on the NEC.
The fugu is an expensive winter delicacy in Japan and only the country's finest restaurants serve it, with chefs who prepare the blowfish required to undertake three years of training and pass a test before being issued with a special license by the government.
A recorded message plays from loudspeakers around the city tells residents not to consume the fish.
It prompted officials to broadcast a warning to residents on the city's loudspeakers. There is no known antidote to the poison.
Eating the toxic parts of the fugu fish can lead to numbness, paralysis, respiratory problems and often an agonizing death while conscious.
"In Japan, we were eating fugu 8,000 years ago, and many people died because of the poison", chef Masato Sawahara said, as quoted by Prestige.
Several people are killed each year in Japan from blowfish poisoning.