Abseiling 70 metres down a sheer cliff to cast a line from a narrow platform suspended over treacherous waters would seem extreme to many recreational fishers, but not Gideon Mettam.

The 28-year-old carpenter from Albany, Western Australia, enjoys the thrill of combining his passions for rock climbing and fishing.

The state's peak recreational fishing body described his latest effort, dubbed Mettam's Ledge by some of Western Australia's fishing fraternity, as the most extreme rock fishing attempt they had ever seen.

Mr Mettam relishes the challenge of catching fish usually caught from boats out in deep water.

He often relies on his 10 years' rock climbing experience to access remote fishing spots he discovers on Google Earth.

Going to great lengths to cast a line

Recreational fishers have nicknamed Gideon Mettam's secret spot 'Mettam's Ledge'. ( Supplied: Gideon Mettam )

Mr Mettam built Mettam's Ledge after reeling in a dhufish at a secret spot between Albany and Walpole a month ago.

He was keen to return because he said it was very rare to catch a decent-sized dhufish from rocks, but it was a tough task fishing from a great height.

"There were no natural ledges close to the water so it was extremely difficult to fish," he said.

"I came up with the idea of a timber platform [and] had a good laugh about the ridiculousness of it, but I like getting [to] places no-one else can."

Back at home, Mr Mettam "slapped together" two pieces of treated pine in under 30 minutes.

He returned to his secret spot and secured four steel bolts in the granite cliff, which support the timber platform and Mr Mettam's rock climbing gear.

"It was pretty tricky," he said.

"To get to the ledge is about a 70-metre abseil in.

"I haven't left the timber platform in place as it would be an eyesore to passing boats and I wouldn't want to change the natural landscape, so I drag it up onto a natural ledge out of sight."

Once the platform is tucked away, Mr Mettam ascends the near-vertical cliff face with his fishing gear and catch.

His first and only time using the daunting set-up was 10 days ago, when he reeled in a seven-kilogram dhufish and a one-metre Port Jackson shark, which he released.

Mr Mettam said he enjoyed the adrenalin-pumping experience and planned to return for round two soon.

Don't try this at home: Recfishwest

Albany carpenter Gideon Mettam with a dhufish he caught at 'Mettam's Ledge'. ( Supplied: Gideon Mettam )

Recfishwest communications manager Tim Grose said Mettam's Ledge was the most extreme example of rock-fishing he had ever seen and warned others not to copy Mr Mettam.

"This is definitely extreme rock fishing and something we wouldn't promote," Mr Grose said.

"Like all rock fishing, all the correct precautions need to be taken to minimise the risk of an accident.

"People need to take responsibility for their own safety."

Mr Mettam said he felt safe fishing from the precarious-looking platform.

"I stay connected to the rock the whole time so even if the ledge fell in, I would be attached to the rock," he said.

"I wouldn't recommend anyone else to try it. If they didn't know what they were doing it's probably not a good idea."

"I do own a personal flotation device I use on other occasions, but I don't think I needed it there."