The Turnbull government's claim its $444 million grant to the Great Barrier Reef Foundation would spur private donations has been disputed by a leading coral scientist who says funding for his own venture has dried up in the wake of the cash splash.

Charlie Veron, a marine biologist dubbed "the godfather of coral" for discovering more than one-fifth the world's coral species, said US donors to his Corals of the World website dropped plans to donate $60,000 once they saw "the Australian government was going to pour a fortune" into reef projects.

"My source of funding has completely stopped," Dr Veron said.

Dr Veron said his website, a decade in the making, would be crucial for any future recovery work on the reef, such as the $100 million reef restoration and adaptation program that will now be under the foundation's stewardship.

Dr Veron said he met last week the foundation head, Anna Marsden, who said she "didn't have any money that could go" to his project despite it needing $200,000, or one-quarter of 1 per cent of the government's largesse, to survive.