David Finlay is a self-confessed creature of the night. While most people are tucked up on the lounge in front of the television, the Kiama scientist and photographer watches one of the greatest shows on Earth. Mother Nature lighting up.

From glow worms in Helensburgh’s old railway tunnel to bioluminescence in Kiama Harbour, fireflies at Macquarie Pass or ghost mushrooms in suburban front yards, David captures it all on camera while the rest of us “nest”.

Helensburgh Glow Worm Tunnels are open again

“Once the sun goes down, people have dinner and sit and watch TV,” says David. “Humans have this tendency to nest at night. But from a really young age I was out in the backyard lying on a blanket looking at stars. That interest in science and astronomy just worked its way into my adult life.”

Born in Orange, and an industrial chemist by trade, David first saw bioluminescence — living organisms that emit light — flashing in the waves at North Beach when he moved to Wollongong from the bush. It sparked a life-long fascination with all things that glow in the dark.

Colloquially known as seas sparkles, bioluminescence presents as pink algae during the day. But at night, when the algae-filled water is agitated, it lights up like a Christmas tree and the waves appear to sparkle. Protected bays and harbours are the best places for sea sparkles and Jervis Bay is the second most prevalent place in Australia to see it (after Tasmania’s Derwent River). Recently Kiama Harbour hosted a bioluminescence bloom and David was there with his camera to capture it, but to also offer advice to those witnessing the rare phenomenon.

Bioluminescence lights up the waves

“If bio is in the water we ask people not to throw rocks in to agitate it and make it sparkle,” he says. “When people throw rocks, they’re actually disturbing the marine environment and potentially ruining habitats on the ocean floor. The best thing to do is actually walk through or put your hands through it.”

Sea sparkles are just one of the four types of bioluminescence that live on the South Coast. The others include fireflies, glow worms (native only to Australia and New Zealand) and ghost mushrooms. 

“This region has the perfect ecosystem for bioluminescence,” says David. “From where I live in Kiama I’m only a short drive away from all four forms. I can see sea sparkles in Kiama Harbour, a glow worm colony in Helensburgh, fireflies at Macquarie Pass and ghost fungi in Kiama front yards. We have amazing access to these things right here, but it can be quite difficult sometimes for people to find them, to know what they're looking at.” 

Fireflies at Cascade Falls, Macquarie Pass

David has been chasing things that light up in the night for so many years that he has all the tips and tricks needed to spot them, and he’s more than happy to share his knowledge.

Last year he offered firefly tours at the base of Macquarie Pass and was blown away by the community’s response, with thousands of people expressing an interest. David’s idea for a “free walk and talk to educate people about fireflies and the environment” became a fully-fledged business venture requiring a National Parks eco pass and public liability insurance. He also had to limit group numbers to protect the environment and sessions booked out almost as quickly as a Taylor Swift concert. David quickly realised that “people want to experience these things for themselves, there is an interest out there”.

“The more people that you can teach how to enjoy being in nature, while also preserving it, the better we all are,” says David who widely shares information and images of spectacular events like watching fireflies, glow worms, bioluminesce and ghost fungi on his Instagram page. Next year, if conditions are favourable, David is looking to offer Ghostbusting tours where people can sign up to join him on a guided ghost fungi tour.

Ghost mushrooms glow in the dark

In the meantime you can follow David’s Instagram page @davefinlaydigital and stay updated with Bioluminescence Australia to see all the best that Mother Nature has to offer.