The grass-roots campaign garnered support to oppose a state government plan to expose protected marine life in Marine Sanctuaries to the risks of fishing.

Part of Saturday's event was the unveiling of a banner supporting the sanctuaries.

The statewide banners on the beach event follows concerns raised by dive shop owners and tour operators, as well as marine scientists, about the economic and environmental impacts of the state government's controversial plan.

Port Macquarie resident Jo Brown organised the local event and said the community has received many social and economic benefits as a result of protecting our marine environment, however she is now concerned about the ramifications of winding back vital protect measures.

"Since the protected areas were established we've reaped reward economically and socially, with tourists travelling to see our beautiful marine life up close, and felt safe in the knowledge that our environment is protected for future generations to benefits from also," Ms Brown said.

"I want our marine life protected for future generations so my daughter can have wonderful experiences out in our oceans.

"But now our reputation is at risk. This is our stand to say 'don't touch our sanctuary areas'".

As well as the impact on the health of feeding and breeding areas, local residents also raised concerns over the reputation of NSW as a destination for tourists seeking a unique natural experience.

Concern about the impact on the health of the state's sanctuary areas for fish and marine life has been building as NSW cabinet considers making trial of beach and headland fishing in the save havens permanent.

The Port Macquarie event coincided with campaigns at 13 other beaches along the NSW?eastern seaboard.

Less than 7 per cent of NSW waters are protected as sanctuaries, with fishing access guaranteed in the remaining 93 per cent of the state's 2140 kilometres of coastal waters.