Our Priorities

Test Your Oyster IQ

Take this quiz to learn how much you know about oysters. Check your results on the "Answers" tab.

A waterbird stands on a collection of oyster shells in the bay.
Oyster shells provide a great base on which new oyster reefs can form. © Kyle Obermann

1. Around the world, which marine habitat is the most endangered?

a. Kelp forests

b. Shellfish reefs

c. Coral reefs

d. Mangroves


2. Hong Kong protects 40% of country park areas on land. Does Hong Kong have any marine protected areas—YES or NO?


3. Oysters and the reefs they form can:

a. Clean water and improve water quality

b. Protect coasts from erosion

c. Provide protection from storms and rising tides

d. Sustain local communities with protein sources and livelihoods

e. All of the above


4. An oyster reef about the size of a football field provides habitat for:

a. Enough fish and seafood to feed 8 HK people for a year

b. Enough fish and seafood to feed 14 HK people for a year

c. Enough fish and seafood to feed 42 HK people for a year


5. True or False: One oyster can clean a whole bathtub of water, every day.


6. Some oysters:

a. Change their gender once or more throughout their lives

b. Can live 100 years

c. Can cure hangovers


7. The famously romantic Italian, Casanova, credited his strong libido to eating 50 oysters for breakfast every morning. Do oysters really improve sex drive?


8. Which of the following is responsible for destroying many of Hong Kong’s native oyster reefs?

a. Coastal reclamation

b. Pollution

c. Overharvesting

d. Commercial dredging

e. All of the above




A scientist digs in the mud next to rows of oyster shells.
Oyster reef research will help restore this vital resource that was once plentiful in Hong Kong. © TNC

Learn more about TNC's oyster restoration work in Hong Kong.

1. B

2. YES—HK protects 2% of its marine area

3. E

4. C


6. A

7. Sorry, there is no scientific evidence to support this being true.

8. E

A juvenile horseshoe crab in an open hand.
A juvenile horseshoe crab found near Hong Kong's oyster reef restoration site. © TNC

Learn more about endangered animals in Asia Pacific that TNC is helping protect.