This is from an article about preparations for Oscar celebrations:
http://cooks.ndtv.com/article/show/oscars-2014-a-sneak-peek-into-the-oscar-party-menu-489921
Here’s a paragraph about the history of the Kumamoto oyster from another web page:
“The history of the Kumamoto oyster is very interesting. 50 years ago, Japanese oyster cultivators started exporting Kumamoto oysters to California, dreaming of growing their businesses. However, Americans discovered that they could cultivate kumamoto oysters in California, which led to cheaper and fresher domestic kumamoto oysters. This caused the disappearance of kumamoto oyster cultivation in Japan. Recently, Japanese people who had eaten Kumamoto oysters in the United States began creating a demand for Kumamoto oysters in Japan. So, the Kumamoto prefecture started cultivating kumamoto oysters and hopefully it will be at the market this season.” http://j-collabo.org/2010/12/27/winter-ingredient-oyster/#more-294
The most recent news I’ve seen about the reintroduction of Kumamoto oyster has be a little discouraging: Temperatures were too high so many of the oysters died. I hope things improve next season.