ditto.
Historically fish was preserved due to necessity and also part of food culture. Shiga prefecture (geographically closer to Kyoto) is well known for funa sushi (carp) that is salted and then preserved in rice. The end result is like a stinky blue cheese, but is the perfect companion with sake. An acquired taste I’m sure (much like those who love Burgundy wine also love Epoisse for similar reasons). Wild blowfish if improperly prepared and processed is poisonous (if any of its blood contaminates the rest of the body), and certain innards are highly prized/sought after (but forbidden) such as the liver. But the locals have figured out a way to pickle the ovaries in such a way (and through the passage of time) that it becomes safe to eat.
For tuna, certain species (and depending on where they were caught) had to be kept in deep flash freeze for transport and that introduced an aging element, and was not done for the sake of doing things (or deliciousness, but turned out that way). Exceptions to this might be Japanese bluefin caught off the coast of Japan, but I suspect for line caught wild Japanese bluefin, if the fish struggles during the catch it builds body temperature and burns valuable fat. So to keep the fish from losing more fat (and thus value at the auction and to the middle wholesalers to restaurants) cold storage would be necessary either way.
I think there’s a little bit of confusion between pickling fish for preservation (and with that comes age), the aging of fish for other purposes (e.g. making bonito flakes), vs the aging of fish for Edomae sushi (in Tokyo).
Right now in parts of Asia (especially Hong Kong) it has become trendy to use sake lees/red vinegar to season sushi rice, where using this rice = “high end”. But now the latest food trend to report is fish aging and in some ways to add to the mystique and on top to justify charging higher prices. It’s one thing if the chefs knows what they are doing, but it’s another when it is being done for the hell of it and to try to jump on the bandwagon (which appears to be true for some others out there). While this practice has been going on for some time at least in Tokyo, it has not received as much coverage until recently. There are a lot of places in Tokyo that do this, but they don’t advertise or say that they do (until you ask). Unfortunately with coverage like this (and poorly written/phrased articles like the WSJ as well as the ignorant comments of some) you will get mixed opinions on the matter and unintended consequences (including bandwagon jumpers competitors).
Regarding Kimura, yes I have been. He is an aging fish geek and in a way a pioneer and one of a kind in his field. Really personable guy and his shop is super intimate and engaging with his customers (his English is limited, though he speaks some). Though I must say that not every single piece was spectacular, and the most instagrammed piece (51 day aged marlin/swordfish) was the least interesting out of everything he served. Every fish has a sweet spot (even for aging) and once you overage for whatever reason, it’s not so good after that regardless of the season. Have to give it to him though for doing something so niche that requires an incredible amount of work/effort/time/knowledge and willing to stick to it. It is an educational experience dining there, but I wouldn’t say the best let alone too earth shattering, but it was overall an enjoyable experience. Don’t believe what all those gourmets and jetsetters post online about the unicorn status of this place!
Bottom line, if a chef or restaurant is confident on what they are doing, they shouldn’t feel the need to brag and market that they age certain fish for certain number of days, and honestly the same goes for the customers and journalists to an extent. Those that are confident (the additional keyword also being humble) in that regard are the true masters who are doing it for the sake of deliciousness, and the places you should seek out to eat and learn to understand more (and the right places to expand your horizons).
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I wish American steakhouses followed your advice with respect to dry-aged beef.
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Yes, I learned this while working on a commercial tuna boat. Similar to properly aging beef.
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Thanks @Sgee.
That was not what I expected. I thought the articles would be about how raw fish served within hours of catch lacks depth (i.e. poke). I’ve never been satisfied with the description of “fresh” being a marker for good sushi. But this was about the old-style of preserving that some now consider an art form and a few consider a piggy-backing gimmick. I’m not in a position to judge, but I would definitely like to try it.
We have a few places in L.A. that are dipping their toes in the water with the zuke method and the emerging popularity of gizzard shad, but I’m not quite sure that is the same thing?
Thanks for the shoutout. It was very interesting!
P.S. I especially liked the part where Kouji-san was willing to poison his mother, so he could continue to stay healthy while perfecting his craft. 
I love this post
Seriously, you two? 
Yeah this part was a riot 
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“Clam House” 2 words that are music to my ears… eyes.
I wouldn’t recommend eating there. It’s currently owned by the sort-of chain that owns The Stinking Rose. Hog Island Oyster Bar is probably the best bet in SF for clams.
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Too bad. I love clams.
Clams aren’t really a big SF seafood specialty anyway.
Well, I didn’t know about this kind of extreme aging but I thought it was common’ish knowledge that a lot of sushi is “matured” for some period of time. The way the article presents the information it does, however, makes it seem like the norm, the alternative to the extreme aging it talks about is absolutely fresh sushi, straight from the sea/market.
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If you have much interest in sushi, I think one of the first things you learn is that lots of things aren’t at their best when just caught.
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What other Tokyo shops are known for aging fish/jukusei? I know of Inomata, Hatsunezushi 
, Sushidokoro Yamada, and Sushi Tsuu.
The original Sushi Sho and many of their disciples restaurants (and restaurants operated by the disciples or sous chefs of the direct disciples of Sushi Sho), e.g. Sushi Sho Yotsuya (the first one), Sushi Murase, Takumi Shingo, Sushi Sho Saito, and probably others like Takumi Tatsuhiro, Sushi Iwase, Sushi Sho in Akita, Fudomae Iwasawa, Takumi Makoto, Takumi Owana and maybe some even lesser known ones. Sushi Sho / Nakazawa san was one of the first to do extended aging of tuna (upwards of 2 weeks) and buri, and him and his disciples (particularly the ones who follow the Sho school faithfully) are very well known for that. As far as other seafood, I’m not clear on how much aging is done, but certainly not everything is aged.
Sushi Kimura does not serve everything aged, for example: his anago or kuro awabi.
Quite a few other restaurants also age their fish but do not advertise it as they prefer to let the food speak for itself (e.g. Kurosaki). My guess it is a combination of light amount of aging (2 or 3 days) and perhaps counting the seafood’s handling conditions from the middle wholesalers and if seafood caught from further away from Tokyo, fish that have to be kept under rigid conditions for transport (mostly tuna from overseas but there could be others).
Other than the places you mentioned, Sushi Shinpaku in Ebisu serves aged fish as well for sushi. There’s also Jukusei Sushi Seimonten Yuga in Funabashi (Chiba Prefecture, about an hour east from Shinjuku by train).
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There’s a gentleman by the name of Josh Niland in Australia whose been experimenting with aging fish for a while now. Hiss restaurant Saint Peters Paddo and his new Fish Butchery shop has been earning some serious accolades down there. Now I realize this is not sushi but he does some pretty incredible dishes and has that mind to think outside the box so I thought it was relevant and worth checking out if anyone is interested.
Chef
https://www.instagram.com/mrniland/
Restaurant
https://www.instagram.com/saintpeterpaddo/
Shop
https://www.instagram.com/fishbutchery/
One example…
https://www.instagram.com/p/BlZSViqgF88/?taken-by=fishbutchery
Enjoy, its food porn for me
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Thanks for sharing @not_tellin! I have been following another Aussie wholesaler aging exploits. Know anyone stateside interesting in aging some tuna belly lardo for me?
https://www.instagram.com/p/BbA3nn_hQky/?hl=en&taken-by=costa_nemitsas
https://www.instagram.com/p/BWttstKlVY-/?hl=en&taken-by=costa_nemitsas
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Con’s a good guy, very passionate. I have chatted with him a bit and watching his experimentation go on. I’m not sure he’s entirely happy with it just yet. Hoping once he perfects it we can have him over for say… a little consultation fee. Love what he’s doing and his account as well.
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Yeah he’s got some amazing product.
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