Tickets for next year's NgāiTakoto 90 Mile Beach Snapper Bonanza go on sale to this year's competitors on Monday, and will go on general sale on July 1.
Spokesman John Stewart said the dates had been brought forward several months in fairness to those who missed out this year because the 1000 tickets available sold out in December.
This year's competitors were again being given the first opportunity, in part so they could keep their competitor's number if they wished to do so.
"It wouldn't be fair that some people who have fished the contest for the last 20 years could miss out again if everyone from this year buys tickets for 2021," he said.
"A lot of people have traditionally bought tickets as Christmas gifts, but weren't able to last year because of the early sellout."