This crab goes by the latin name of Eriocheir japonica (De Haan, 1835). It was first recorded outside Japan by a Dutch researcher.
It also goes under the name of 上海蟹 (Chuugo mokuzugani/チュウゴクモクズガニ) although this can also be read as “Shanghai kani” because such specimen come from China. Not to be confused!

Japanese Mitten Crab or Mokuzugani in Japanese is also called Mokuzou, Zugani, Tsugani or Kegani.
It caught alsmost everywhere in Japan in Autumn and Winter.
In Autumn the females come to lay their eggs at river mouths.
Plenty are found along the Izu Peninsula in Shizuoka Prefecture.
They are caught in boxes baited with fish.

As for food, they can be eaten boiled in soups or crushed with their shell and cooked with miso. They could even be prepared as French bisque.

The female specimens are particularly appreciated for their egg sacs.

These boiled egg sacs with the meat make for delicious sushi nigiri or gunkan!

Very popular served/prpeared the Chinese way!

RECOMMENDED RELATED WEBSITES

So Good Sushi Restaurant in Nice France
Navigating Nagoya by Paige, Shop with Intent by Debbie, BULA KANA in Fiji, Kraemer’s Culinary blog by Frank Kraemer in New York,Tokyo Food File by Robbie Swinnerton, 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, Pie
rre.Cuisine, Francescannotwrite, My White Kitchen, 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, Hapabento, Kitchen Cow, Lunch In A Box, Susan at Arkonlite, Vegan Lunch Box; Tokyo Tom Baker, Daily Food Porn/Osaka, Only Nature Food Porn, Happy Little Bento, J-Mama’s Kitchen, Cook, Eat, Play, Repeat, Bento Lunch Blog (German), Adventures In Bento, Anna The Red’s Bento Factory, Ohayo Bento,

Must-see tasting websites:

-Sake: Ichi For The Michi by Rebekah Wilson-Lye in Tokyo, Tokyo Through The Drinking Glass, Tokyo Foodcast, Urban Sake, Sake World
-Wine: Palate To Pen, Warren Bobrow, Cellar Tours, Ancient Fire Wines Blog
-Beer: Another Pint, Please!, Beering In Good Mind: All about Craft Beer in Kansai by Nevitt Reagan!
ABRACADABREW, Magical Craftbeer from Japan
-Whisky: Nonjatta: All about whisky in Japan by Stefan Van Eycken
-Japanese Pottery to enjoy your favourite drinks: Yellin Yakimono Gallery

Non gastronomy must-see sites by Shizuoka Residents