There are at least 12 recognized kinds of mullet being caught all over the world.
The flathead mullet in particular is an important food fish for many around the world, and can be both fished and farmed. The roe of this mullet is salted, dried, and compressed to make a specialty food across the world, such as Korean myeongran jeot, Japanese karasumi, Italian botargo, and Egyptian batarekh . In Egypt, the fish itself is salted, dried, and pickled to make feseekh.

Flathead Mullet, Mugil Cephalus in Latin, or Bora/鯔/鰡 in Japanese, will reach length of over 80 cm in Japan, although the average length will more around 50 cm.

It is caught south of Hokkaido near river mouths or in bays receiving lots of river waters.
Like any othe fish, it will be called other names depending upon the region: Isegoi (Western Japan), Itanebora (Ehime Prefecture), Mabora (Hiroshima Prefecture), Tsukura (Okinawa), Kuchime, Mejiro, Hebuna, Haku, Makuchi, Kurome, or Merome.

It is a versatile fish:

Served raw as sashimi in Japanese Cuisine or,

as carpaccio in Italian style.

It is more unusual as sushi nigiri (front two) and will probably be found as such only locally.

To answer a query from a friend, it is more encountered cooked:
Deep-fried and served with a soy-based sauce is common to many asian countries.

Deep-fried before being served with a sweet and sour sauce,

or the same again with tofu is popular in Taiwan (and in Japan!).

First steamed and then served with a sauce made with sweet pickled plum and miso is supposed to be of Chinese origin, but can be found again in many Asians countries.

But for all these recipes, the most valuable (and very expensive at that!) is the roe of the female mullets!

It is served as it is, extravagantly in Japanese or Italian cuisine sashimi or carpaccio.

The combinations are infinite!

An extravagant salad of Japanese and Italian inspiration!

Grated over an extravagant pasta dish!

RECOMMENDED RELATED WEBSITES

Green Tea Club by Satoshi Nihonyanagi in Shizuoka!, Mind Some by Tina in Taiwan, Le Manger by Camille Oger (French), The Indian Tourist, Masala Herb by Helene Dsouza in Goa, India, Mummy I Can Cook! by Shu Han in London, Pierre.Cuisine, Francescannotwrite, My White Kitchen, 47 Japanese Farms Through The Eyes of Its Rural Communities, Foodhoe, Chucks Eats, Things that Fizz & Stuff, Five Euro Food by Charles,Red Shallot Kitchen by Priscilla,With a Glass, Nami | Just One Cookbook, Peach Farm Studio, Clumsyfingers by Xethia, PepperBento,Adventures in Bento Making, American Bent, Beanbento, Bento No, Bento Wo Tsukurimashou, Cooking Cute, Eula, Hapabento , Happy Bento, Jacki’s Bento Blog, Kitchen Cow, Leggo My Obento, Le Petit Journal Bento & CO (French), Lunch In A Box,
Susan at Arkonlite, Vegan Lunch Box; Tokyo Tom Baker, Daily Food Porn/Osaka, Only Nature Food Porn, Happy Little Bento, The Herbed Kitchen, J-Mama’s Kitchen, Cook, Eat, Play, Repeat, Bento Lunch Blog (German), Adventures In Bento, Anna The Red’s Bento Factory, Cooking Cute, Timeless Gourmet, Bento Bug, Ideal Meal, Bentosaurus, Mr. Foodie (London/UK), Ohayo Bento,

Must-see tasting websites:

-Sake: Tokyo Through The Drinking Glass, Tokyo Foodcast, Urban Sake, Sake World
-Wine: Palate To Pen, Warren Bobrow, Cellar Tours, Ancient Fire Wines Blog
-Beer: Good Beer & Country Boys, Another Pint, Please!
-Japanese Pottery to enjoy your favourite drinks: Yellin Yakimono Gallery