The festival was organised by the Tourism Ministry, Zadar's Tourist Board, and the Japanese Embassy.
Among the guests were Japanese Ambassador Keiji Ide and his South Korean, Australian and French counterparts.
The Japanese delicacies were prepared by Japanese chefs and sushi masters Amano and Sato, with the wadaiko traditional Japanese drums as musical accompaniment.
Tourism Minister Darko Lorencin, Zadar Mayor Bozidar Kalmeta and the Japanese ambassador also prepared the tuna.
Croatia exports a lot of tuna to Japan and tuna is being caught now, which is a good opportunity for our cooperation, from economic to culinary, the ambassador said, hoping that this event will become a tradition.
Lorencin said this was an important and valuable event, adding that 11% more Japanese tourists visited Croatia last year, 38% more Chinese tourists and twice and a half as many South Korean tourists than in 2013.
"Japanese cuisine... is world famous, so we must develop this kind of offer," he said, confident that tuna producers would be even more creative in presenting this quality tourism product.
Lorencin also commented on the news that Standard & Poor's Ratings Services on Friday affirmed its long- and short-term foreign and local currency sovereign credit ratings on Croatia of 'BB/B', with a stable outlook, forecasting that the Croatian economy will overcome the recession in the second half of 2015.
He told the press it was very important that the industrial production downturn was stopped for the first time last year and that exports were also growing. He voiced confidence that GDP would begin to rise in the second half of this year.
Zadar Mayor Kalmeta said the fact that Japanese and South Korean reporters were covering the festival meant they would promote Zadar, Croatia and its tuna producers and products. "That will certainly result in the arrival of more Japanese and South Korean guests, although we have a 65% increase in tourist arrivals from those countries, but also help our main export economic branch, tuna production."