See the Great Barrier Reef reproduction phenomena

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“It’s referred to as the snow storm of the Great Barrier Reef, but there’s nothing frosty about the underwater romp known as coral spawning – a yearly event where loved-up coral release trillions of eggs and sperm into the ocean, in the hope of rejuvenating and reproducing their species”

Coral spawning new media 2016 Moore Reef of Sunlover Cruises from BIOPIXEL on Vimeo.

During the months of October or November, at the precise time when the moon is full and the water temperature is balmy, coral spawning takes place over several days, with different species spawning on different nights. Buoyant eggs sprout from the coral polyp’s gut cavity and rise to the ocean’s surface in a thick, soup-like layer. Once the egg has been externally fertilised, it becomes a planula larva that drifts until firmly landing on the ocean floor to mature.

A phenomenon only discovered around 35 years ago, coral spawning is an event that Cairns-based marine biologist and zoologist, Russell Hore, has only witnessed a handful of times in his 30 years of diving the Great Barrier Reef.

“From a biological point of view, coral spawning is a necessary process, and it is wonderful to see – it’s the Everest of seeing reproduction in nature – but you need to be in the right spot at the right time,” said Russell.

Tidal flow is a major player in the coral courtship –too strong and the eggs are swept away – with the process relying on the ocean’s current to ignite the romance. The optimal spawning time is four to six days after a full moon.

“In the lead up to the spawning day, the reef becomes fecund – it’s almost as if you’re watching a pregnancy on a minute scale – without the cravings for ice-cream,” said Russell.

“If you get up close, you will see little orange balls of eggs pushing to the mouth of the coral – these are little signs that ejaculation on a mass scale is about to take place.”

Divers blessed by Mother Nature to witness this burst of love may endure pungent scents and be left wading in what Russell describes as “a giant protein shake”, surrounded by some greedy critters chomping away at the eggs.

“You’ll find most of the fish life sitting on the sea bottom with distended stomachs, looking quite sorry for themselves. I liken it to humans stuffing themselves with Tim Tams, though it’s good for their energy reserves.”

Great Barrier Reef reproduction phenomena info:

As head of the environmental division and the reef biosearch program at the Quicksilver Group in Queensland’s Tropical North, Russell is passionate about showcasing mass coral spawning events on the Great Barrier Reef, which is the largest and most diverse ecosystem in the world. For further information or to contact the Quicksilver Group visit here.

“Queensland is the best place to see coral spawning – we have high speed boats to get you out to the Great Barrier Reef and highly qualified divers, many with marine biology backgrounds to guide you,” said Russell. “November diving offers great weather – perfect warm waters and low wind. To book a coral spawning trip visit or

Tracy Burrows114 Posts

    Tracy Burrows is the founder of the Out There Global platform featuring both cost effective and luxury best cultural vacation ideas & experiences from around the world. From Jan 2014 – Dec 2016 she managed the blog (a United Nations World Summit Award Winner: Culture & Tourism 2016 & National Geographic partner). She was also consulting editor at MOZambique Magazine, and a contributing writer at Sawubona Magazine (South African Airways inflight magazine), and Africa Geographic. Prior to her career she obtained a tourism research, and marketing degree, and also graduated from a 2 year ‘Management in Development Program’ in San Diego California. She also acquired a qualification in journalism and media and since it’s been all about culture, adventure and multi media! Her nourishment comes from all those who have impacted her, including: family; friends; and strangers alike. Thank you for joining our journey, and we hope you enjoy finding an immersive experience and the culture & adventure in the destination! Aside from Out There Global Magazine, Tracy has also run a Public Relations, and SEO business since 2010 for small business.


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