50+ Fish Quiz Questions and Answers

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If you love animals and the marine world, then this ultimate fish quiz is for you!

There are thousands and thousands of species of fish in the world as well as a lot of unknown ones as well.

The marine world is such a fascinating thing. From the famous and cute fish (yes, looking at you Nemo) to the biggest one, there are so many things to know about fish.

So if that’s a topic that interests you, you will enjoy these fish questions and answers.

Here is how it works. You can find below 5 rounds of fish quiz questions. Each round is different in the way that it can have a different difficulty level or different types of questions.

Make sure to grab a sheet of paper and a pen so you can keep track of your scores.

Round 1: Easy Fish Trivia Questions

1. What kind of fish is Nemo in Finding Nemo?
2. Fish extract oxygen from the water through which organ?
3. What is the largest species of fish in the world?
4. What are fish eggs also known as?
5. What do salmon do at the end of their yearly migration from salt to freshwater?
6. Which amazonian fish’s name literally means ‘tooth fish’ in the Tupí language of Brazil?
7. What is the name of the world’s largest reef system?
8. What is the most common fish kept in private aquariums?
9. What is the term for a group of fish?
10. What is the caudal fin better known as?

Round 1: Easy Fish Trivia Questions and Answers

1. What kind of fish is Nemo in Finding Nemo? Clown Fish
2. Fish extract oxygen from the water through which organ? Gills
3. What is the largest species of fish in the world? Whale Shark
4. What are fish eggs also known as? Roe
5. What do salmon do at the end of their yearly migration from salt to freshwater? Lay eggs
6. Which amazonian fish’s name literally means ‘tooth fish’ in the Tupí language of Brazil? Piranha
7. What is the name of the world’s largest reef system? The Great Barrier Reef
8. What is the most common fish kept in private aquariums? Gold Fish
9. What is the term for a group of fish? A School
10. What is the caudal fin better known as? The Tail Fine

Round 2: Fish Multiple-Choice Questions

1. Which of the following fish species do not live in saltwater?
   1. Damselfish
   2. Chromis
   3. Cichlids
   4. Mandarinfish
2. Which of the following families give birth to live young?
   1. Barbs
   2. Danios
   3. Angelfish
   4. Guppies
3. Pupperfish will ‘puff up’ when they are….
   1. Threatened
   2. Full
   3. Mating 
   4. Hunting
4. Which characteristic gives surgeonfish their name?
   1. They have mask-like markings on the face.
   2. They methodically dissect their food when eating.
   3. They have scalpel-like spines on the tail.
   4. They are thought to eat certain algaes to treat illness. 
5. Which taxonomic group do octopi belong to?
   1. Fish
   2. Mollusks
   3. Crustaceans 
   4. Amphibians
6. When the blobfish was first discovered in 2003, what nickname was it given by the scientists who trawled it out of the depths?
   1. Mr Blobby
   2. Blobby McGee
   3. Blobby McBlobface
   4. Colin O’Blobby
7. Which of the following fish species has not recently become extinct due to human influence?
   1. Blackfin Cisco
   2. Chinese Paddlefish
   3. The Rainbow Smelt
   4. The Blue Walleye
8. With just 263 individuals, the Devils Hole Pupfish is the most endangered fish in the world. What is its unique habitat? 
   1. A water-filled cave under death valley.
   2. A dormant volcano under the Yangtze River. 
   3. A tectonic cave in New Zealand.
   4. A 10 thousand metre deep trench off the US East Coast.
9. Which of the following fish cannot be eaten as part of a kosher diet?
   1. Salmon
   2. Eels
   3. Pike
   4. Catfish
10. An electric eel can generate up to how many volts of electricity.
    1. 400 volts
    2. 600 volts
    3. 800 volts
    4. 1000 volts

Round 2: Fish Multiple-Choice Questions and Answers

1. Which of the following fish species do not live in saltwater? C. Cichlids
2. Which of the following families give birth to live young? D. Guppies
3. Pupperfish will ‘puff up’ when they are…. A. Threatened
4. Which characteristic gives surgeonfish their name? C. scalpel-like spines on the tail
5. Which taxonomic group do octopi belong to? B. Mollusks 
6. When the blobfish was first discovered in 2003, what nickname was it given by the scientists who trawled it out of the depths? A. Mr Blobby
7. Which of the following fish species has not recently become extinct due to human influence? C. The Rainbow Smelt
8. With just 263 individuals, the Devils Hole Pupfish is the most endangered fish in the world. What is its unique habitat?  A. a water-filled cave under death valley
9. Which of the following fish cannot be eaten as part of a kosher diet? D. catfish
10. An electric eel can generate up to how many volts of electricity. B. 600 volts

Round 3: Fish Quiz – True or False

1. Most fish do not have lungs.
2. Rays are a type of shark.
3. The light in an anglerfish’s ‘lure’ is created by luminescent bacteria.
4. Though there have been numerous sightings of the rare Goblin Shark, it’s thought that it doesn’t actually exist and people are just spotting swordfish or hammerhead sharks.
5. The Striated Frogfish is the only fish with hair.
6. Just like counting the rings on a tree, scientists can age sharks by counting their vertebrae
7. Each year, more haddock are harvested from the oceans than any other fish species.
8. Steve Urwin was very unlucky to be killed by a stingray as there have only ever been 17 deaths caused by stingrays recorded worldwide.
9. All clownfish are born female and become male one of the other males in the environment dies?
10. Blobish have a lifespan of up to 130 years.

Round 3: Fish Quiz Answers- True or False

1. Most fish do not have lungs. True.
2. Rays are a type of shark. False. Rays are not sharks, though they are closely related. 
3. The light in an anglerfish’s ‘lure’ is created by luminescent bacteria. True.
4. Though there have been numerous sightings of the rare Goblin Shark, it’s thought that it doesn’t actually exist and people are just spotting swordfish or hammerhead sharks. False
5. The Striated Frogfish is the only fish with hair. False
6. Just like counting the rings on a tree, scientists can age sharks by counting their vertebrae True.
7. Each year, more haddock are harvested from the oceans than any other fish species. False
8. Steve Urwin was very unlucky to be killed by a stingray as there have only ever been 17 deaths caused by stingrays recorded worldwide. True.
9. All clownfish are born female and become male one of the other males in the environment dies? False, all clownfish are born female. 
10. Blobish have a lifespan of up to 130 years. True.

Round 4: Medium Fish Trivia Questions

1. The 46 species of the genus Hippocampus are more commonly known as what?
2. Boxfish hint to predators that they’re venomous with bright scales in which colour?
3. In which Spanish city can you find l’Oceanografic?
4. What type of fish is unique for hunting insects by spitting water at them, knocking them into the water?
5. What is the smallest type of shark in the world?
6. What do lionfish, stonefish and toadfish have in common?
7. What is the Mola more commonly known as?
8. Chondrichthyes have what rather than bone?
9. Where do jawfish keep their eggs?
10. What characteristic gave stargazer fish their unique name?
11. What is the name for the biological study of fish?

Round 4: Medium Fish Trivia Questions and Answers

1. The 46 species of the genus Hippocampus are more commonly known as what? Seahorses 
2. Boxfish hint to predators that they’re venomous with bright scales in which colour? Yellow
3. In which Spanish city can you find l’Oceanografic? Valencia
4. What type of fish is unique for hunting insects by spitting water at them, knocking them into the water? Archerfish
5. What is the smallest type of shark in the world? Dwarf Lanternshark
6. What do lionfish, stonefish and toadfish have in common? They are venomous
7. What is the Mola more commonly known as? Sunfish
8. Chondrichthyes have what rather than bone? Cartilage 
9. Where do jawfish keep their eggs? In their mouths 
10. What characteristic gave stargazer fish their unique name? They have eyes on top of their head
11. What is the name for the biological study of fish? Ichthyology

Round 5: Hard Fish Trivia Questions

1. What are the only two species of true eels found in UK waters?
2. Alongside seahorses and seadragons, what is the only other type of fish whose males give birth to live young?
3. How did divers decrease the rate of wild Leafy Sea Dragons to the extent that the Australian government placed complete protection on the species?
4. Which family of fish are often called ‘Taking Catfish’ for their ability to communicate using sounds?
5. Weighing over 3 tons, the body of what kind of fish broke records in 2022 for the heaviest bony fish ever recorded?
6. What is the term for a fish species that can live in both fresh and saltwater?
7. The Goliath tigerfish, mondeli bureau and the Tana lungfish are all found exclusively in which river?
8. What is the only type of fish with just one lung?
9. What is the largest freshwater fish species?
10. What fish species is the only animal to have a skull but no vertebrae?

Round 5: Hard Fish Trivia Questions and Answers

1. What are the only two species of true eels found in UK waters? Silver eels and Conger Eels
2. Alongside seahorses and seadragons, what is the only other type of fish whose males give birth to live young? Pipefish
3. How did divers decrease the rate of wild Leafy Sea Dragons to the extent that the Australian government placed complete protection on the species? By taking them home to keep in aquariums
4. Which family of fish are often called ‘Taking Catfish’ for their ability to communicate using sounds? Doradids
5. Weighing over 3 tons, the body of what kind of fish broke records in 2022 for the heaviest bony fish ever recorded? Bump-Head Sunfish
6. What is the term for a fish species that can live in both fresh and saltwater? Euryhaline.
7. The Goliath tigerfish, mondeli bureau and the Tana lungfish are all found exclusively in which river? The Congo River
8. What is the only type of fish with just one lung? Australian (or Queensland) Lungfish
9. What is the largest freshwater fish species? Beluga Sturgeon
10. What fish species is the only animal to have a skull but no vertebrae? Hagfish

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