There are fresh environmental concerns for some of WA's most pristine waters after Indonesian-marked rubbish was spotted in protected coral zones.

Ningaloo tourist and former Radio 6PR producer Liz Sheehan told Simon Beaumont on 6PR Mornings she was on a snorkelling tour and saw rubbish being pulled from the ocean at Ningaloo Reef.

Northern Wildcatch Seafood Australia director and fisherman Grant Barker said there were fleets of boats from Indonesia off our northern coast and believes punishment for illegal Indonesian fishermen should be higher.

"There would be a little bit [of rubbish] coming off the boats but most of it would be coming from the islands, I would've thought," he said.

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