This Sunday, they will throw a line in for the inaugural Fishing Lake Macquarie Classic and to raise money for the John Hunter Children's Hospital.

Mr Griffiths is a moderator of Fishing Lake Macquarie, a recreational group formed in 2008 and run entirely through Facebook.

The page provides information for locals and visitors to Lake Macquarie on the area's top fishing spots as well as tides and weather.

From 6am until 8pm on Sunday, December 8, anglers can cast their lines anywhere in the lake from Gwandalan to Speers Point.

Entrants are then required to post a photo of their catch laid against a length-measuring mat to the Facebook page.

Mr Griffiths said this "environmentally friendly" method aimed to promote catch and release.

Registration costs $20 through the group's Everyday Hero crowdfunding page, which can be found at www.everydayhero.com.au/event/fishingclassic2013.

All competition prizes, including a two-person fishing trip to Port Stephens, were donated by local businesses.

This means all the money raised on the day will go to the group's chosen charity - the John Hunter Children's Hospital.

Mr Griffiths, who has two children of his own, said giving the money to the hospital was a "no-brainer".

"When the kids and I are out fishing, we think how lucky we are to have the chance to spend quality family time together when others are stuck in hospital," he said.

"My kids are healthy and happy, but some people aren't as lucky."

Registrations for the Fishing Lake Macquarie Classic close on Friday, December 6.