How do parrotfish create sand?

By grinding coral and excreting it

Reef Fish Quiz: Places, People and Key Facts

A parrotfish wraps itself in a bubble of mucus to sleep, and this reef fish quiz is full of surprises from the busiest neighborhoods in the sea. Explore the Red Sea and the Coral Triangle to meet cleaner wrasses, pufferfish, butterflyfish and the lionfish that invaded the Caribbean.

Start Reef Fish Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Sleep
How do some parrotfish sleep?
Sand
How do parrotfish create sand?
Cleaner
What do cleaner wrasses do?
Puffer
How do pufferfish defend themselves?
Lionfish
Which reef fish is invasive in the Caribbean?
Butterfly
Why do butterflyfish have eyespots near their tails?
Triangle
Which region has the most reef fish species?
Grouper
Which reef fish hunts cooperatively with moray eels?
Damselfish
Which small reef fish farm algae?
Sex change
Which reef fish often start as females and become males?

Explanations: answer key for all 10 questions

Q1: How do some parrotfish sleep?
Answer: Inside a mucus cocoon
The cocoon may hide their scent.
Q2: How do parrotfish create sand?
Answer: By grinding coral and excreting it
One fish can make hundreds of kilograms a year.
Q3: What do cleaner wrasses do?
Answer: Eat parasites off other fish
Big fish line up at cleaning stations.
Q4: How do pufferfish defend themselves?
Answer: Inflating and being toxic
Some contain tetrodotoxin.
Q5: Which reef fish is invasive in the Caribbean?
Answer: Lionfish
It has venomous spines.
Q6: Why do butterflyfish have eyespots near their tails?
Answer: To confuse predators
Predators aim at the wrong end.
Q7: Which region has the most reef fish species?
Answer: The Coral Triangle
It includes Indonesia and the Philippines.
Q8: Which reef fish hunts cooperatively with moray eels?
Answer: Grouper
The grouper signals with head shakes.
Q9: Which small reef fish farm algae?
Answer: Damselfish
They chase intruders from their gardens.
Q10: Which reef fish often start as females and become males?
Answer: Wrasses and parrotfish
This is common on reefs.

Reef Fish Quiz – The Busiest Neighborhoods in the Sea

Coral reefs cover a tiny part of the ocean but are home to about a quarter of all marine fish species. Reef fish come in dazzling colors and shapes, from tiny gobies to large groupers and sharks.

Reef fish have many roles. Parrotfish graze algae and make sand, cleaner wrasses remove parasites, damselfish farm algae and groupers team up with moray eels to hunt. Many reef fish can change sex, and bright colors help them signal or hide.

Reef fish depend on healthy corals. Bleaching, overfishing, pollution and invasive species like lionfish in the Caribbean threaten them. Marine protected areas in places like the Red Sea and the Coral Triangle help reef fish thrive.

What This Quiz Teaches

Divers and ocean fans will enjoy these questions.

How parrotfish sleep
What cleaner wrasses do
How pufferfish defend
Which fish is invasive
Where reef fish are most diverse

Did You Know?

Surgeonfish have scalpel-like spines.
Gobies can live with shrimp.
Moorish idols are hard to keep.
Triggerfish guard nests fiercely.
Some reef fish glow under blue light.