Would I be able to teach at a university in Japan?

Question:

I'm thinking of getting my PhD in Evolutionary biology or Ecology; maybe something else. If I get a PhD and am able to speak fluent Japanese, would I be able to teach at a University in Japan?

Answer:

What would you like to teach? English? Maybe, you can teach English at a Japanese university. But biology?

There is a plenty of Japanese with biology PhD now who can't find a biology related job. And the number of Japanese universities is shrinking because the number of kids is falling.

So it's extremely difficult.