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101 Ocean Trivia Questions To Challenge A Marine Biology Fan

Do you love learning about fish and other aquatic sea life? Is visiting the beach or going on boat rides some of your favorite activities? If so, you will love this ocean quiz.

The ocean makes up nearly three-quarters of the entire planet. This massive body of water is essential for life on Earth. The more we learn about the ocean, the crazier it gets. Home to some incredible plants and animals, learning about the ocean unlocks a deeper understanding of the world around us.

Whether you’re fascinated by coral reef systems or enchanted by the mysteries of the deep sea, you are sure to be challenged by this in-depth ocean trivia quiz. Put your knowledge to the test with these ocean trivia questions and answers.

Once you finish this ocean trivia quiz, try out these other nature quiz topics, such as the rainforest, weather, and plants.

The shell of a sea urchin is called what?

Skin

Shell

Brace

Test

How long is the mid ocean ridge?

30,000km

20.000km

70,000 km

50,000km

What is the largest species of turtle?

Hawksbill

Kemps ridley

Loggerhead

Leatherback

How many eyes has a Scallop?

3

35

1

2

What type of whale appeared in Moby Dick?

Blue

Killer Whale

Humpback

Sperm

How old can crabs live to?

25 years

20 years

13 years

1 year

The Portuguese Man-of War is what?

A turtle

A shopwreck

A crab

A jellyfish

Which fish is the best source of Omega 3

Sardines

Tuna

Red Snapper

Salmon

The pearl symbolises what?

Happiness

Love

Honesty

Loyalty

HMS Coventry was sunk in which conflict?

WW2

The Gulf War

The Falklands

WW1

What is the fastest a tuna can swim?

65kph

60Kph

75kph

70kph

The HMS Cricket sank in which sea?

The Baltic sea

The North sea

The Mediterraean

The Red Sea

The Swordfish can grow to how much?

30lbs

90lbs

50lbs

120lbs

The Clownfish can be found where?

In the middle of the ocean

Near esturies

On the seabed

Near coral

The surmuletus fish is what color?

Blue

Red

Yellow

White

How many tides are there per day?

3

4

1

2

A Rainbow Wrasse is what?

Jellyfish

Squid

Octopus

Fish

Where is the Blowfish normally found?

Off the shores of Australia

Off the shores of Chine

Off the shores of India

Off the shores of South America

The pearl is the gemstone for which month?

February

November

June

August

The Little Tunny is a species of what?

Tuna

Mullet

Cod

Haddock

The Horseshoe Crab belongs to which Genus?

Mammal

Crustacean

Arachnid

Fish

The Basslet is also known as what?

Fairy Basslet

Sweet Basslet

Threeline Basslet

Candy Basslet

How long have sharks been around?

200 million years

400 million years

100 million years

300 million years

Which is the largest creature in the sea?

Dolphin

Blue Whale

Killer Whale

Hammerhead Shark

How many hearts has a squid?

2

1

4

3

How deep can Dolphins swim?

150m

260m

200m

300m

Which is the only fish to have eyelids?

The Seahorse

The Shark

The Pufferfish

The Halibut

Seals detect their prey by using what?

Sound

Smell

Eyesight

Their whiskers

How many legs has an octopus?

8

10

6

4

What is the shallowest ocean in the world?

Indian

Pacific

Atlantic

Arctic

A group of Walrus is called what?

A pack

A mob

A set

A herd

Which octopus is poisonous to humans?

The Sothern Keeled

The Bigeye

The Blue Ringed

The Hammer

What type of ocean water is more dense?

Water near the shore

Equator water

Polar water

None of these

What number of shapes do pearls come in?

4

10

8

6

What is the saltiest sea in the world?

Red sea

North Sea

Black sea

Mediterranean sea

Which sea does the European Eel spawn?

The Mediterranian

The Sargasso sea

The North Sea

The Bay of Biscay

How many years can a Sea Sponge live for?

40

30

10

20

The Hydrophiinae is better known as what?

Red Sea Squid

Boston Lobster

Coral Crab

Sea Snake

The Flounder is what?

A tropical fish

A flat fish

A Llobster

A crab

The Sea Lamprey is native to which ocean?

Pacific

Atlantic

Arctic

Indian

How many species of Stonefish are there?

8

5

3

13

How many species of Pufferfish exist?

30

150

120

240

How many years can a sea otter live?

30

25

40

5

Scampi is a form of what?

Lobsters

Fish

Crab

Shrimps

The Hewett oil field is in which ocean?

Arctic

Atlantic

Indian

Pacific

Oysters are rich in which vitamin?

All of these

D

A

C

The Agukhas current is in which ocean?

Indian

Atlantic

Arctic

Pacific

What is the fastest fish in the ocean?

Flying fish

The salifish

Swordfish

Blue Marlin

How many species of sea turtle are there?

21

11

7

4

What is the largest sea fish?

Bluefin Tuna

Great White Shak

The Blue Whale

Whale shark

A group of dolphins is called what?

Pod

Mob

Pack

Set

Where does a benthic fish live?

On the seabed

On the surface of the sea

On the rocks

On the sand

The Meriam is better known as what?

Hawaiin Sea Otter

California sea otter

Oregon Sea Otter

Alaskan Sea Otter

Which fish has associations with royalty?

Queen Coris

Prince Coris

Princess Coris

King Coris

The Fionaven Oilfield is located where?

Near the Shtland Islands

Off the Coast of The Netherlands

Off the coast of Norway

Off the coast of Scotland

Which sea creature produces Calamari?

Clams

Squid

Fish

Octopus

The Whiting can be found in which ocean?

Arctic

Indian

Pacific

Atlantic

What is a Sand Smelt?

Fish

Squid

Lobster

Crab

What is the world’s deepest Oil platform?

Bulwinkle

Tombua

Baldpate

Petronius

The Barreleye fish is also known as what?

The Ghost Fish

The Spider Fish

The Devil Fish

The Spook Fish

The Stary Smooth Hound is a type of what?

Sharl

Seal

Crab

Lobster

The anal fin can be found where on a fish?

Tail

Upper back

Head

Lower back

What is the oldest a seahorse can live?

4 years

2 years

5 years

1 year

How many clams can a walrus eat in a day?

200

400

600

800

The name for the study of fish is what?

Pisctory

Fishology

Marinology

Icthyology

A pearl is produced inside a what?

Clam

Lobster

Squid

Crab

A cod can live up to what age?

25 years

15 years

20 years

10 years

A Sea Sponge is which of these?

Animal

Plant

Rock

Coral

How many hearts has an octopus got?

3

1

2

4

Pearl farming is known as what?

Dericulture

Periculture

Fericulture

Tericulture

The Yellowtail is a species of what?

Whale

Shark

Barracuda

Dolphin

A penguin can swim up to how many mph?

10

25

20

15

What is the average length of a sea snake?

4m

1m

3m

2 m

What color is the Beluga whale?

White

Blue

Grey

Green

How many hearts does an octopus have?

4

2

1

3

How large are the Giant Squid’s eyeballs?

The size of a tennisball

The size of a golfball

The size of pea

The size of a basketball

How long can a dolphin stay under water?

15mins

10mins

5mins

20mins

How many types of sea urchin are there?

400

100

300

200

How long can a Barracuda grow in length?

6 ft

4 ft

5 ft

3 ft

Which of the following is a sea creature?

Sea Sprout

Sea Cucumber

Sea Carrot

Sea Turnip

Japanese seafood dishes are called what?

Fushi

Sushi

Gushi

Ryiushi

Which country consumes the most Tuna?

Spain

Japan

Italy

Indian

Cuttlefish have what color blood?

Clear

Red

Green

Yellow

What color is the snapper fish usually?

Red

Yellow

Black

Green

Which shark has associations with a drink?

Beer Shark

Coffe Shark

Water Shark

Milk Shark

How many pairs of legs does a crab have?

6

5

3

4

At what depth does the Dragonfish live?

2 km

1.5 km

1 km

1.3 km

How long have jellyfish been in the seas?

800 million years

500 million years

200 million years

650 million years

Bowie Seamount is what?

Fish

Undersea volcano

Lobster

Crab

Which of the following do octopuses lack?

Eyes

Kidney

Heart

Bones

How many species of Cod are there?

3

6

7

12

A group of crabs is called a what?

Army

Flute

Swarm

Cast

Santorini is what?

Crab

Undersea volcano

Shrimp

Squid

The Equatorial current is in which ocean?

Indian

Pacific

Arctic

Atlantic

What are Basalts?

None of these

Volcanic erruptions in the sea

Volcanic ash in the ocean

Volcanic rocks on the seabed

Where is the blowhole of a whale located?

Before the rear fins

Underneath

On its back

On its head

How many species of Puffer Fish are there?

120

10

100

43

What color are the spots on a Plaice?

Red

Black

Yellow Bellied

Blue

The Swordfish hunts at what time of day?

Dawn

Night

Dusk

Day

The ‘Ghost Ship’ wreck lies in which sea?

The South China sea

The Baltic sea

The Red Sea

The North sea

How many species of Clownfish exist?

12

45

50

28

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