The art of eating fish sperm in Japan

Jessica Thompson

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Within my first month of living in Japan came my first date in Japan. And with my first date in Japan came my first experience eating piscine semen.


Until that point in my life, I hadn’t considered the existence of – let alone the prospect of eating – fish semen.

But there I was in labyrinthine alleyways of Osaka’s Shinsekai area at a tiny seafood izakaya filled with lively locals, feeling pretty proud of myself for downing slabs of raw squid, ankimo (steamed monkfish fish liver, known as the “foie gras of the sea”), and kanimiso (a grey/green paste of crab brains), when out came a bowl containing what looked like a raw human brain. It was topped with some sliced spring onion, a shiso leaf and a soy sauce-based dressing. I asked my date, somewhat reluctantly, what it was. Fish sperm, he told me, through a mixture of broken English and pantomime circumlocution.

The milt is extracted in its entirety from the fish, and looks like the result of a human lobotomy. Depending on the level of seminal fluid contained in the sac, the color ranges from translucent and whitish with a pink hue to opaque and white as snow, hence shirako is represented by kanji characters meaning “white children.”

In what sounds like a twisted chauvinistic joke – but is, in fact, entirely real – it’s believed to be good for the skin and have anti-aging properties, with high levels of protein, and vitamins B12 and D.

I went, tentatively, to pick up the shirako with my chopsticks, only to find it had the sticky viscosity of raw egg. But I wanted to keep face with my date and the onlookers, and adhere to my try-everything-once”food policy, so I put it in my mouth. It was tepid, disconcertingly creamy, and slightly fishy. Fans describe this as a “melting taste,” “the sweetness with sea air” and “sensual umami.”

This delicacy is not unique to Japan; Russians eat pickled herring semen – (moloka) and Sicilians eatlattume (tuna milt) as a popular pasta topping, for example.

But the Japanese take things to another level. Considering other marine reproductive organs – caviar (fish eggs) and uni (sea urchin gonads) – are widely popular global delicacies, why not try fish sperm?

Here’s how to sample it if you visit Japan in winter:


The art of eating fish sperm in JapanPhoto courtesy of Photo via Flickr/City Foodsters

This is recommended, especially for shirako noobs, because anything deep fried in batter is bound to be infinitely more approachable. As with other types of tempura, shirako is dredged in a light batter and deep-fried. It’s crisp on the outside, creamy on the inside.


The art of eating fish sperm in JapanPhoto courtesy of Photo via Flickr/Koji Horaguchi

At the other end of the spectrum, shirako ponzu is for those who want a more straight-up sperm-eating experience, as was my introduction to the delicacy. It generally comes served with grated daikon, ponzu (a citrus and soy sauce dressing) and spring onion. Keep a sake (or a heated kanzake given the time of year) close by to wash it down as necessary.


The art of eating fish sperm in JapanPhoto courtesy of Photo via Flickr/LWYang

Gunkanmaki  (battleship sushi) is the variety made up of a pressed rice ball wrapped with nori to make a little “ship,” and then topped with various ingredients. It’s the perfect vehicle for the sticky mess that is shirako.

Nabe (hotpot)

The art of eating fish sperm in JapanPhoto courtesy of Photo via Flickr/挪威 企鵝

Winter is hotpot season in Japan, and they come in many different varieties – miso and oyster, kimchi and pork, and ponzu dashi with shirako.

Yakimono (grilled)

The art of eating fish sperm in JapanPhoto courtesy of Photo via Flickr/Fumiaki Yoshimatsu

Shirako can also be prepared grill-top, by bbqing it over binchotan charcoal, giving the sac a tightness and the interior a velvety, pudding-like texture.

Chawanmushi (egg custard)

The art of eating fish sperm in JapanPhoto courtesy of Photo via Flickr/City Foodsters

Mushi is steamed, chawan is a tea cup. Chawanmushi is egg custard steamed in a tea cup, and when shirako is in season, you may find it on top or buried within your custard.

These are the most popular and commonly found ways to eat shirako, but if you go to more upmarket restaurants, you may find it prepared more creatively – tartlets, puree, and mousse, for example.

*This article was originally published in December 2017. 


Jessica Thompson

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