Last year's event attracted 221 competitors in 79 boats.
Treasurer Darrell Healey said other changes were the cancellation of the fish auction for the public and an earlier start time of 5.30am.
"We can't run the auction anymore because of changes in regulations.
"We usually start the competition at 6am but we're starting at 5.30am this year to allow for the tide and they'll be back in by 3pm to weigh in.
"There'll also be a catch and release section for snapper only. We're encouraging people to put the big ones back in because they are the breeding fish."
Ms Laugesen said competition was expected to be fierce with club members catching good-sized fish recently.
"It's a good amount too and a good range - kingfish, hapuka, snapper and tarakihi," she said.
Mr Healey said the prize pool of $30,000 would be allocated, even if the competition had to be cancelled due to poor conditions.
"Before we make a call about whether to start the competition, we go out over the bar to make sure conditions are safe because we're catering for small boats as well as big ones."
The competition was a busy time for Coastguard Wanganui with every boat having to call in its trip report and confirm when it had returned from fishing, Ms Laugesen said.
Off the water, the event is based at the Castlecliff Club with social events on Friday and Saturday nights and the Sunday evening prizegiving.
Early bird entries close on Friday, January 5. Entry forms and more information are available at www.wanganuimanawatuseafishingclub.co.nz