Issue 37 - May 2018
The dark stare of the Dragon. A mysterious phenomenon in a Dalmatian lake.
A path of ancient rocks and red ochre ground separates the Dalmatian dock of Rogoznica, from a more enigmatic and peculiar place. At the base of the Gradina peninsula, nestled in the green blanket of the Mediterranean scrub, the Zmajevo Oko, or Dragon’s Eye lake, appears as an impenetrable ink blot.
By Marianna Morè
A stunning vision, the crater lake is surrounded by sheer and grey cliffs, whose height reaches 24 meters and which surround a basin of approximately 10.000 square meters. Its primitive appearance conveys the impression of a sudden collapse, as if the water had swallowed the vegetation and left a vaste, black hole. The lake was in fact formed in ancient times by the sinking of a subterranean cave vault, that subsided at the bottom of the pond.
However, it isn’t only this harsh vision that attracts scientists and tourists: the location is in fact a unique hydrogeomorphological environment on the Adriatic coast. The salted water of the lake comes from the nearby sea, its concavity being filled at the end of the Ice Age, when the sea level rose. The temperature varies in layers – the Dragon’s Eye lake is meromictic – and around 9 meters deep there is no more oxygen. On the contrary, the water is characterized by high levels of sulphuric hydrogen, a gas considered poisonous.
Even more surprising is what the locals call the boiling of the lake phenomenon. Named rollover in the engineering literature, the event is provoked by the mixing of the water column. The latter occurs when a heavier lower layer and a lighter upper layer of fluids overturn because of a sudden heat flux through the system, which can be due to earthquakes or seismic activities. In such cases, the oxigen concentration dramatically decreases and the water becomes supersaturated in CO2, sulphur and other gases that normally build up indisturbed at the bottom of meromictic lakes.
The change in the chemical composition modifies the color of the pond, that becomes white and milky as if boiling. But it also has a consequence on the marine species – such as oysters, crabs, shrimps and mussels – that populate it. Due to a lack of oxygen, they die abruptly, as it happened lately in 2011.
Because of its features, the Dragon’s Eye has been compared by scientists to the Black Sea, the Framvaren Fjord in Norway and Lake Pavin in France. But the greatest contribution this body of water has given, is to the imagination and the tradition of Rogoznica people. Many legends of a sometimes protective and sometimes merciless dragon are still commemorated in local festivities: the dark eye has maintained its misterious glance.
On a warm day I reach the edge of the lake for a plunge. The sun is setting and a lively group of young Dalmatians indulge in a long series of dives. I take a deep breath, streach my arms towards the water and lift my feet in the air with a leap. No boiling lake, no nasty dragons come in sight for the moment: just the dark fascination of a natural wonder.
Marianna Morè is a freeelancer writer and lives in Padova, Italy. She is a windsurfer, a scuba diver, an avid reader and a rather imaginative and creative woman. Her stories have been published by SEVENSEAS Media, the Italian edition of Christophorus, byGonomad.com and by a local newspaper.
Follow her blog at: https://shapeofclouds.wordpress.com/
We love the work we do, and we hope you love the content we share. A donation in support of SEVENSEAS Media will help us carry our mission forward.
- Running community building projects in 174 countries
- Engaging student ambassadors in over 50 universities
- Forming strategic alliances and partnerships with over 200 professional organizations
- Publishing over 500 authors, photographers, and researchers
- Sponsoring dozens of beach and community clean-ups
- Providing free scientific resources for educators
- Promoting over 20 tailored conservation job postings per week- totaling over 1000 opportunities per year
- Inspiring and educating our readers through rich imagery, engaging content, and a compelling conservation message
- We do all of the above FOR FREE, because we care about the future
Find the latest articles on SEVENSEAS Media here.
Want to get in touch with questions or a submission? Contact us here.
Issue 37 - May 2018
Thousands of Juvenile Oysters Find Home on Restored Reef
The Southern Hemisphere’s largest reef restoration project has reached an important milestone with the seeding of more than 50,000 endangered Australian flat oysters.

The Windara Reef project is being led by The Nature Conservancy in the waters of Gulf St Vincent in South Australia. It consists of 150 artificial reefs spanning 20ha about 1km off the coast of Ardrossan on South Australia’s Yorke Peninsula.
The reefs were sunk in 2017 and 2018 and the first 30,000 mature native oysters were seeded in January 2018. The native oysters (Ostrea angasi) seeded are eight months old, about the size of an egg yolk and have been supplied by the South Australian Research and Development Institute. Another deployment of native oysters will take place on the reef later this year with the goal of boosting their numbers to more than 7 million in the 20ha zone.
The juvenile oysters are likely to begin producing their spat (offspring) when they reach three years old. It is expected take seven years to create a fully functioning, self-sustaining reef. However, early testing just six months after the first 30,000 oysters were seeded last year found the oysters to be surviving and a number of wild oyster spat had also made their way to the reef, which was an unexpected bonus.
Oyster reefs are considered the temperate water equivalent to coral reefs in tropical waters. Australia’s southern coastline was home to thousands of kilometres of oyster reefs before European settlement but dredging to remove substrate for lime production and the harvesting of oysters for food wiped out all the reefs except for one off the coast of Tasmania. Adult native oysters can filter more than 100 litres of water a day and excrete a mucus-like substance that is rich in nutrients and provides food for small shellfish that in turn provide food for larger fish.
The Nature Conservancy (TNC) has been involved in dozens of shellfish reef restoration projects, chiefly in the United States and is considered a global expert on their establishment. TNC Project Manager Anita Nedosyko said the first dives to measure the environmental benefits on water quality, fish production and biodiversity of stage one conducted last year as part of a six-year study into the success of the project had yielded positive results. “We’ve already seen abalone, scallops, sea urchins, schools of leatherjackets, snapper, magpie perch and cuttlefish,” she said.

Leather jackets schooling at the 9-month-old Stage 1 Windara Reef in May 2018. Picture: Anita Nedosyko/The Nature Conservancy.
The construction of the reef involved placing almost 10,000 tonnes of limestone boulders, each about the size of a soccer ball, to form 150 reefs across the 20ha area. Nedosyko said the individual reef clumps were designed to be close enough together so that native oyster larvae could move across the reef system through tidal flow. She said it was hoped the Windara Reef would eventually lead to increased fish production of 5 tonnes per hectare a year including recreational fishing favourites such as snapper and King George whiting.
“A successful reef for us will be one where oysters are surviving, spawning and producing new recruits and we’re also starting to see some additional biodiversity,” Nedosyko said.
“It’s like a well-stocked fridge – it’s really attractive to fish coming in because they can stop, get fed and move on or decide to be residents.”
The project is the result of a collaboration between The South Australian Government, The Nature Conservancy, The Australian Government, Yorke Peninsula Council and The University of Adelaide. It aims to restore fish stocks for recreational anglers, improve water quality and biodiversity and revive the oyster in the Gulf.
South Australian Environment Minister David Speirs said the project would improve gulf waters and also be a boost for the region as a whole. “This project will result in economic and social benefit to the nearby communities of Yorke Peninsula through the creation of new jobs, particularly tourism associated with recreation and fishing, as well as new volunteering and community education programs,” he said.
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Art & Culture
Ocean-Inspired Paintings
My relationship with the ocean is complex. Many of my most joyful memories are made up of moments when I’m either immersed in the sea or walking along the beach, admiring all of the many colours, shapes and expressions of this majestic mass of movement. As a child I was always the first one in the water and the last one to get out; so comfortable in and fascinated by this other world underneath the surface.
When I was sixteen and training to become a lifeguard, my father drowned in a fishing accident, and so my whole relationship with the ocean changed. How could something that I love so much take a person that I love so much away from me? After that, in my anger and bitterness, I turned away from the sea for a while.
Eventually, I started to get in touch with the ocean again, bit by bit, and as I did I found great joy and healing, as if coming back home; coming back home to the water and to myself. It was a profound experience. As a part of this healing process I began painting moments from this journey and suddenly found that I have a whole collection of images and paintings as a result.
I continue to paint and I’m more in love with the ocean now than ever before. Sometimes it scares me and my old fears and grief rise up, but I simply acknowledge it, feel it, and express it through my art.
The sea is so personal for many people – it holds memories and feelings; it’s a very powerful thing. Something to be respected and appreciated. It’s sad to see all of the pollution that litters it now – it has changed so drastically in such little time. This is why I’m trying to be as ethical and eco-friendly as possible when packaging my art. I use 100% biodegradable cornstarch sheets for my prints and reuse old packaging when shipping a painting. Because of my own personal experience, I also donate 10% of profits from my Etsy shop to the International Life Saving Federation – an organisation made up of lifesaving organisations from around the world. https://www.ilsf.org
My name is Fiona, I’m an artist from Ireland, painting ocean-inspired art. When someone purchases one of my pieces, I hope that they’re taking away more than just a pretty picture – I hope that it’s so much more for them, as it is for me.
Instagram: https://www.instagram.com/fionarossart/
Online shop: https://www.etsy.com/shop/BlueWildTribe
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Art & Culture
Surasak Nuibut, Mountain Climber, Adventurer & Travel Photographer: Puncak Gunung Baling Kedah
Gunung Baling is a mountain in Kedah, Malaysia with a peak climbing to 546 meters in the sky. The summit has magnificent views of the surroundings. There is only one basic trail up Gunung Baling but it has decent signage. The beginning of the trail can be muddy and difficult with the steep incline, especially if wet after rains. The trek is worth it though once you embrace the view at the summit. Enjoy this hike and bring people you care about to share those magnificent sights.
Pro tip: Bring a water proof camera or housing and dress for every type of weather imaginable.
Are you ready for a trip like this?
Em Surasak currently lives in Bangkok, Thailand and is an avid adventurer, traveler, photographer, and mountain climber. These days you can find him scaling cliffs throughout Europe and Southeast Asia.
“I’m a dirt person , I trust the dirt. I don’t trust diamond and gold.”
You can follow more of his adventures here on instagram.
We love the work we do, and we hope you love the content we share. A donation in support of SEVENSEAS Media will help us carry our mission forward.
- Running community building projects in 174 countries
- Engaging student ambassadors in over 50 universities
- Forming strategic alliances and partnerships with over 200 professional organizations
- Publishing over 500 authors, photographers, and researchers
- Sponsoring dozens of beach and community clean-ups
- Providing free scientific resources for educators
- Promoting over 20 tailored conservation job postings per week- totaling over 1000 opportunities per year
- Inspiring and educating our readers through rich imagery, engaging content, and a compelling conservation message
- We do all of the above FOR FREE, because we care about the future
Find the latest articles on SEVENSEAS Media here.
Want to get in touch with questions or a submission? Contact us here.
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