Quiz: Reef

Bulletin of 11 June 2026

What do corals expel inside their tissues to cause coral bleaching?
Answer
Zooxanthellae (symbiotic algae).
World Reef Day is observed annually on what date?
Answer
1 June.
Which fish species is famous for helping maintain reef health by grazing algae that might otherwise outcompete corals?
Answer
Parrotfish.
Which 2003 animated film helped make clownfish one of the world's most recognizable reef species?
Answer
Finding Nemo.
Which coral reef system is the largest in the world?
Answer
Great Barrier Reef.

Previous quizzes