Conservationists remain concerned about the make-up of the Great Barrier Reef Marine Park Authority (GBRMPA) despite it being cleared of any conflict of interest.

A federal inquiry was ordered after claims two GBRMPA board members, Tony Mooney and Jon Grayson, held interests in companies that could benefit from expanding coal and gas production near the reef.

It found they had not breached their public duty and had appropriately disclosed their interests.

GBRMPA spokesman Russell Reichelt told Senate Estimates as much of the report will be released as possible as privacy considerations must be taken into account.

"I understand the intention now - it's kind of quite recent the Minister's announcement - will be to release as much of the full report and very quickly," he said.

"We have extensive conflict of interest management and they've been found to be effective.

"It finds we have a high level of management of potential conflicts and the report also explains the structure of the board and the fact that a disagreement doesn't amount to a conflict.

"Our board is set out for under the Act to contain interests relating to the reef."

However, North Queensland Conservation Council spokeswoman Wendy Tubman remains concerned only one of the five board members has a background in marine science.

"At the moment the only person with any scientific background into marine science is the CEO and the chair, Dr Russell Reichelt," she said.

"None of the other people - the other four people on the board - have that level of scientific expertise.

"The North Queensland Conservation Council did write to [Federal Environment Minister Greg Hunt] to ask him to expand the terms of reference to look at increasing the size and skill set of the board."

Greenpeace spokeswoman Louise Mathiesson says it is disappointed the Federal Government has not released the full report.

"We're very disappointed that they're glossing over the issue in this way," she said.

"We think it's pretty clear that anyone who has direct interests in coal and gas companies that are involved in expanding ports beside the Great Barrier Reef have some kind of potential conflict of interest.

"We're calling on GBRMPA and Greg Hunt to release all of the details so that we can so we can see for ourselves exactly how deeply involved these people are in the coal and gas industry, and make an informed judgment about whether they're the right kind of people to be running the Great Barrier Reef."