Fish... or Not a Fish?

Try to guess whether each of these creatures is a fish ... or not a fish.
Quiz by interopia
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Last updated: December 31, 2019
First submittedApril 15, 2019
Times taken16,139
Rating4.69
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1. Catfish
Fish
Not
2. Lionfish
Fish
Not
3. Cuttlefish
Fish
Not
Cuttlefish are mollusks. They are close relatives of squid and octupuses.
4. Jellyfish
Fish
Not
5. Lungfish
Fish
Not
6. Crayfish
Fish
Not
Crayfish, also known as crawdads, are freshwater crustaceans.
7. Shellfish
Fish
Not
Shellfish is a generic term that refers to certain marine animals such as shrimp, mussels, and lobsters
8. Stonefish
Fish
Not
9. Silverfish
Fish
Not
Silverfish are small winged insects that like to eat wallpaper.
10. Starfish
Fish
Not
11. Seahorse
Fish
Not
12. Sea urchin
Fish
Not
13. Sea snake
Fish
Not
14. Eel
Fish
Not
15. Tadpole
Fish
Not
A tadpole is the larval stage of a frog or toad.
16. Octopus
Fish
Not
17. Whale shark
Fish
Not
Whale sharks are the largest species of fish.
18. Porpoise
Fish
Not
19. Guppy
Fish
Not
20. Manta ray
Fish
Not
21. Manatee
Fish
Not
22. Lamprey
Fish
Not
+8
Level 81
Dec 31, 2019
Fish / Not A Fish
The name of this has a great ring to it for a game.
+8
Level 75
Jan 3, 2020
This isn't fish related, but in New Orleans, I was taught to play 'Costume / No Costume' by some locals. It essentially consists of people-watching while guessing whether passers-by are in costume or not. I remember being impressed by folks who seem to hit the sweet spot in-between. But then, I was wearing a tutu and eating a sandwich.
+1
Level 80
Dec 31, 2019
+2
Level 44
Jan 1, 2020
Lamprey belongs to the phylum cyclostomata and not Pisces therefore lamprey are eel like creature and does not belong to fish
+4
Level 67
Jan 1, 2020
So why didnt you make a comment about eel being categorised as fish here??
+1
Level 78
Jan 1, 2020
Eels are bony fish, unlike lampreys.
+3
Level 80
Jan 1, 2020
They are jawless fish.
+1
Level 78
Jan 1, 2020
I mean, if we're going to be technical, all bony fish are more closely related to terrestrial vertebrates than they are to cartilaginous and jawless fish.
+2
Level 71
Jan 1, 2020
Cyclostomata is not a phylum, is a subclass. Lampreys are chordates/vertebrates. It's long been called a fish, regardless of its taxonomy.
+1
Level 80
Jan 4, 2020
Lampreys are an ambiguous case, I don't think it's a good idea to include them in such a quiz.
+1
Level 67
Jan 1, 2020
Somehow I got fooled by the seahorse... And also we were taught sharks and ray were a different subclass but it was so drilled in like you have fish and the cartilaginous fish (chondrichthyes). Obviously in more elementary school level words, "you have fish and sharks and rays". That division was taught so early and strongly that I dont really see them as fish, which they obviously are, because they are definitrly not mammals or birds. But I cant help but to think of them separately (the seperation obviously exists, but as two subclasses chondrichthyes and osteichthyes)
+4
Level 67
Jan 1, 2020
Btw the word fish looks soooo weird now
+1
Level 80
Jan 4, 2020
Well, they are considered distinct classes, not even subclasses. In fact, there is the class of cartilaginous fish, the class of ray-finned fish and the... superclass? of the rest of vertebrates, which includes only eight species of lobe-finned fish.
+1
Level 62
Apr 18, 2020
That's what they always taught us at school, too! In my language, we even have a more reasonable name for them (fish - ryba, chondrichthyes - paryba) that implies that they're ancient, fish-like creatures.
+1
Level 62
Apr 18, 2020
I looked it up on Wikipedia and it seems that "fish" is a rather general term that is not part of the phylogenetic classification. It's only typological and as such includes sharks and rays etc. In Czech, however, the term for this is a little different (even though we often use the word for fish in this sense, as well, but it's done just for simplification and is considered incorrect).
What we mean by "fish" (ryby) in Czech is the paraphyletic superclass "osteichthyes" (bony fish). That's why we don't consider sharks as fish.

So the term fish isn't part of the scientific classification but it's a popular, demotic word which has a different meaning in each language. I find it quite interesting how the meaning of this word, which I thought was quite unambiguous, is so different in different cultures.
+3
Level 46
Jan 1, 2020
I got all of them except Seahorse.
+2
Level 75
Jan 3, 2020
Me too. I remember thinking, "Surely bearing live young disqualifies you from fishhood!"

("Thinking" is probably an exaggeration.)
+2
Level 64
Jan 11, 2020
This is a cute comment!
+1
Level 71
Jan 1, 2020
I had no idea eels, rays or seahorses were considered fish
+2
Level 80
Jan 4, 2020
Look at the picture of an eel, it clearly has fins and a fish head, though the are long (sea snakes, on the other hand, are, well, snakes). Rays and Sharks are cartilaginous fish, which are considered a distinct class to bony fish. Anyway, both classes are what are commonly called "fish".
+3
Level 35
Jan 2, 2020
I had no idea seahorse was a fish you learn something new everyday with these quizzes I love it
+3
Level 79
Jan 2, 2020
I am the fish master
+1
Level 82
Jan 3, 2020
Yeah, what if "Bahamut" had been one of the entries? Fish or not fish?
+1
Level 79
Jan 11, 2020
heh. Depends on the mythology if it's even a sea creature or not. But then, if it is, those originally writing about it had no concept of what a fish was apart from whales, dolphins, et cetera.
+4
Level 52
Jan 3, 2020
This quiz is silly. Everyone knows that there's no such thing as a fish.
+1
Level 59
Jan 11, 2020
This is scientifically accurate. The category of a fish is arbitrary.
+1
Level 80
Jan 4, 2020
Funny. I got most of them right. Only missed Lamprey (because it's ambiguous) and Silverfish which I should have translated because we call it the same way in French ("poisson d'argent")... by the way, its description is wrong, it is wingless, not winged ;) (and rather a protoinsect than a true insect but it doesn't really matter).
+1
Level 64
Jan 11, 2020
Fun quiz. Got all but seahorse, manta ray and eel.
+2
Level 46
Jan 11, 2020
Got all of them except Manta Ray. Some were pretty obvious and some I didn't even know what they were in English so I had to think for a minut. XD
+2
Level 56
Jan 11, 2020
Almost got silverfish wrong; that's what we call whitebait. Realised quickly that this one probably referred to the insect.
+2
Level 64
Jan 11, 2020
after watching bbc docs this was a first try 100%
+2
Level 58
Jan 12, 2020
To fish or not to fish
+1
Level 44
Jan 14, 2020
"Fish" is a polyphyletic group and thus this quiz is inherently flawed
+2
Level 50
Jan 20, 2020
I guess my knowledge on sea creatures is a little... FISHY! Ah? Ah? Hey, where's everybody going?
+1
Level 67
Feb 4, 2020
Error in the explanation, silverfish do not have wings (in fact nowhere in their evolutionary line is there a species that has wings. They diverged before wings evolved. Unlike other insects without wings that do come from a lineage after wings have evolved, but have lost them again along the way.)
+1
Level 67
Feb 4, 2020
Correction checkbox

( not sure if I checked the box or not, it's 2am and gone back and forward to all kinds of pages if I am not carefull it will be morning and I will have read up all about insects, evolution, flight dynamics and whatever I will come across, which links in with the previous subject.. Kind of what some people have with youtube, I have with research, before you know it you will have spend hours, going from one subject to the next.)

+1
Level 65
May 3, 2020
I got full in this, I guessed 18 of the as XD
+1
Level 18
Jun 19, 2020
I did much better than I thought I would! 14/22. :P
+1
Level 31
Jun 21, 2020
I got 21/22, guess I really like fish :D