Around 20 rare Asian arowana fish will be displayed at the Hanoi Museum for the capital's millennial anniversary, local news website Vietnamnet reported Wednesday.
The event will be held from October 5 to 10 by the Hanoi Ornamental Creature Association, the news source said.
Once labeled as highly endangered by the Convention on International Trade in Endangered Species of Wild Fauna and Flora, the arowana's numbers have decreased due to overfishing and low breeding activity.
It is now mainly bred in captivity.
Over the past five years, the number of people in major cities like Ho Chi Minh City and Hanoi raising arowana, popularly known as dragon fish, has increased to thousands.
They are brought mainly from Singapore. Others are imported from Malaysia, Indonesia and China.
Like people in other Asian countries such as China, Vietnamese people raise the fish for good luck, prosperity and to show their wealth.
A small fish costs US$1,000 on average, while a big one may cost up to nearly $15,000, the news source said, adding that all dragon fish imported into Vietnam were attached with a chip showing its code, farm and year of birth.
A fully-grown arowana can reach 60 to 70 centimeters in length and can live for decades.