Fish are an indispensable ingredient for Japanese people.
Even older adults casually eat fish in their daily lives, but there are many kinds, and there’s still so much we don’t know about their ecology.
This time, we’re introducing a quiz all about fish.
Each question is a fun, trivia-like challenge, so enjoy thinking them through!
It’s a multiple-choice quiz with three options, making it easy for anyone to answer.
It’s great that you can learn about fish while taking the quiz, too.
Please feel free to use it as a recreation activity in senior care facilities.
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[For Seniors] Lively and Fun! Fish Trivia Quiz (1–10)
Which fish has males that give birth?
- oarfish
- seahorse
- shark
See the answer
seahorse
Among fish, the seahorse is uniquely the only species in which the male gives birth! In a single delivery, he is said to release about 1,000 babies. They’re also known as the devoted dads of the animal kingdom, recognized for showing deep affection toward their partners and offspring.
What fish species are shirasu the juveniles of?
- sardine
- Thailand
- mackerel
See the answer
sardine
How many people know—or have ever thought about—what shirasu grow into when they get bigger? Shirasu grow into sardines. More precisely, not just one kind but members of the sardine group, such as Japanese anchovy and Japanese pilchard.
Which of the following fish does kazunoko come from (i.e., whose eggs are they)?
- herring
- salmon
- tuna
See the answer
herring
Kazunoko is herring roe that has been salted and dried. It’s well known as a staple item in New Year’s osechi cuisine. In fact, since kazunoko is eaten only in Japan, the country is said to be the world’s largest consumer.
Which clothing color makes it easier to scoop goldfish?
- red
- yellow
- black
See the answer
black
Goldfish scooping is a classic feature of summer festivals. Many of us were captivated by it as children, weren’t we? They say it’s good to wear black clothing when you scoop goldfish. Goldfish tend to stay where light doesn’t reach and gather in dark places. That’s why they’re drawn to you if you’re wearing black.
How can you tell the difference between flounder and flatfish?
- mouth
- eye
- Face orientation
See the answer
mouth
Flounders and Japanese halibut look similar and are hard to tell apart. People often say that when you place them belly-side down, if the head faces right it’s a flounder (karei), and if it faces left it’s a halibut (hirame). But the truly accurate way to distinguish them is by the mouth. The hirame, which catches and eats small fish, has a large mouth with sharp teeth, while the karei, which doesn’t actively prey on fish, has a small, puckered mouth.
About how many spines does a porcupinefish have?
- 1,000 pieces
- 350 pieces
- 100 pieces
See the answer
350 pieces
Because its name includes “hari (needle) senbon (a thousand),” you might think it has over a thousand needles, but in reality it has about 350. The name comes from its appearance—people thought it looked like it had more than a thousand needles.
How many brains does an octopus have?
- 5 pieces
- 8 pieces
- 9 pieces
See the answer
9 pieces
Isn’t it surprising that they have as many as nine brains? There’s one primary brain where you’d normally expect it—behind the eyes—and then each of the eight arms has its own brain. And astonishingly, they have three hearts. So their lightning-fast moves were hiding the secret of a high-spec body all along.


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