Walter Dellisanti, Coral Health in HK

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DO NOT SHARE FROM SLIDE 10.

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  • Ph
  • Oxygen
  • Temperature

What else could we measure?

  • In the water loop, we can change water (nutritions, temperature, chemistry)
  • I could measure the color of the coral , with say a USB microscopic webcam

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HK Coral

Sandy bottom "mobile" bottom is not so good for coral

Stratification (layers of cold and warm water) may be the driving cause of HK coral survival

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Q&A

Platygyra Carnosa

Climate Resilience

√ What are the global warming figures for Hong Kong for 2030, 2050, 2100? How would you comment about HK coral future

Hong Kong is a hotspot for coral refugees. Tropical corals tend to settle down in this area. People are working on genetic modification of coral - but that raises ethics questions wether we should "design" the corals of the future.

If the change of temperature is fast, it would be bad. In the Red Sea, some corals can live at 34º

What do you think would help Hong Kong coral communities most?
Can we grow coral in the lab and plant them back

Chinese U and HKU are doing this kind of experiment

√ Was there ever a bleaching event in HK? Would you prefer to be a place where they actually bleach - like

√ How does Platygyra Carnosa compare to other corals in HK in terms of resilience?

It is not representative of other species in HK. I use this on Platygyra and Pavona (2 surfaces, smaller polypes)
√ Why did you choose HK corals?

Previously, I was working on similar processes of measuring seawater processes. Marine biologists are interested in biological processes and how humans influence

√ What's your best and worst experience in HK?

It's pretty cold in the winter diving. Sometimes the conditions are bad.

√ Why did you choose this particular site?

Easy to access. Away from recreational diving

Science

√ Would micro fragmentations to accelerate growth work well on Platygyra Carnosa? Would you suggest other methods for Hong Kong?

Best conservation is prevention. Remove the stressors. Restauration, many models exist. Hong Kong does not have enough hard bottom.

√ The system of North Carolina valid in Hong Kong?

We had to prove the instrument is working and apply it to monitoring. There are 5 to 6 devices around the world.

Do we have a solid model of the optimal conditions to grow coral?
√ How do you measure plasticity of coral? What's the equation like?

In 48h, they can recover. In 2 or 3 days, they can die too. Coral in the shade perform better - that would be interesting to test.

√ About the technology - how many people do you need to use the system?

2 people is generally enough. Anchoring is the

Spawning is once a year.

√ What are the predators for coral in Hong Kong?

Sea Urchin is vegetarian eat corals. They can make holes in calcium carbonate. Drupella snail also eat coral. Coral use chemistry, mucus to "defend themselves".

Can be applied for coral observation so we know what species are in what location

Repeated mapping can help with seasonal observation.

Ground truthing satellite imagery with this device?

Device

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How is it made? How much does it cost?

Cost: 20,000 USD per device The app is not open. Are there calculations on this app.

Found online

Further Discussion

The design has evolved from a conventional boat to a large catamaran, to a raft with drones parts, that we tested in the Philippines and Malaysia, and recently, we're evolving extremely rapidly towards a multihull design with 5 cameras (recent prototypes videos below). Tomorrow, we will build the newest version that will look more like a ladder. We try to keep our documentation up to date here: https://github.com/MakerBay/Coral_Reef_Mapping_DroneWe finance this project as an educational summer project, so we have a lot of young people involved, and we're making a film out of it (trailer): https://youtu.be/Z7f6rBbPcbU

Here are the most recent versions with the 5 cameras array:

  1. June 20: Bow and arrow 1 line: https://youtu.be/W7E8WBd1eGo
  2. July 5: Bow and arrow testing in Hoi Ha (5 cameras success!): https://youtu.be/fYAkC2NoJ_g | https://youtu.be/HU2sp5lxoa0 | https://youtu.be/6Mlqb9LjLSQ | https://youtu.be/FwHSxIsrswg
  3. July 25, Bow and arrow 2 lines: https://youtu.be/g0wsQ2PKoyQ
  4. Aug 1: Dream Catcher: https://youtu.be/sOlXB5bmjcU
  5. Aug 8: Delta Force: https://youtu.be/C-0JwmQMXG4
  6. Aug 15: V-Ladder: That's the one we build tomorrow. We want to present to the public Aug 28