FAMILY of a couple missing on Mount Buffalo remain hopeful the pair will be found, saying they are "super fit" and "pretty responsible".
Police and SES crews have spent Monday searching for Trevor Salvado and his wife Cindy Bohan who were last seen on Friday morning.
The pair's son Nathan Salvado, 21, and Ms Bohan's sister Maria Bohan said at the search site on Monday afternoon they were hopeful the bushwalkers would survive.
"Cindy is one of nine and I'm her big sister, so we're all hanging together with Cindy and Trevor's children, Isaac, Nathan and Rachael, and we hope that they are safe and that they are found really, really soon," Ms Bohan said.
She said the Melbourne couple had been spent the past eight years visiting the Ovens Valley with other couples and their children and they arrived at the Bright caravan park at different times.
"Cindy and Trevor are super fit, they're very healthy, they're used to being out for hours...they spend a lot of time outside," Ms Bohan said.
Nathan Salvado said he was alerted to his parents' disappearance via a text message from one of their friends stating they had not been seen at the camping ground.
"I just want them to be warm and safe," he said.
"They're pretty responsible walkers, they know what they have to do survive."
Mr Salvado said his father was a cyclist and paraglider, while his mother enjoyed stand-up paddle boarding.
Ms Bohan said their hopes and "good old-fashioned prayers" were buoyed by the emergency services commitment to the search.
"It's bloody impressive," she said of the police operation.
"That gives us lots and lots of confidence.
"As a big family we want to thank all the people who are working here in (a) volunteer capacity and who've come from miles and miles to do that."
SES members from as far away as Kinglake and Numurkah joined North East crews in the search yesterday.
Police Inspector Joy Arbuthnot said about 120 searchers were involved in the hunt yesterday, compared to 50 on Sunday.
She said that conditions had been "very favourable and we're hopeful for a good outcome".
Helicopters assisted the ground search which Inspector Arbuthnot described as "tricky" due to the rugged terrain with crevices and boulders.