Potaka said on average the Tira has 120-140 paddlers on the water each year.
"And then we've got extended whānau that would be supporting from the marae and as roadies, and also those of the hau kāinga on our marae, the ahi kā – between 300 and 400 people in total, so we cannot take the risk of having the virus exploding within our rohe.
"We will remain cautious for the foreseeable future."
Potaka said the decision does not mean smaller groups cannot organise to paddle parts of the river, as they did in January this year.
"Upholding our connection to the awa and to one another can be achieved via smaller-scale events in the various reaches of the awa," he said.
The Tira Hoe Waka is a mainstay of the Whanganui River tribal calendar. It is usually held every January over 15 days, with a flotilla of canoes and kayaks travelling the country's longest navigable river and visiting ancient marae sites and wāhi tapu along the way, from Taumarunui to Whanganui city.
Planning will begin in the new year to enable the Tira Hoe Waka to go ahead in 2023.