Made in Japan mark, green crackle glaze fish dish. Looks kind of like Imari, but isn't. Any ides?

Answer 1

It may be Celadon:
"Celadons are usually fired in a reducing atmosphere within a fuel driven kiln. As with most glazes, crazing (a glaze defect) can occur in the glaze and, if the characteristic is desirable, it is referred to as crackle glaze."
"The phrase celadon for the pottery's pale jade-green glaze was first applied by European connoisseurs to the wares when celadon first appeared in France in the 17th century."

Answer 2

If it has green crackle glaze, it very much can be celadon, but I am afraid I am not sure celadon has ever been made in Japan. As an idea, I can say even for Japanese eyes Imari, Karatsu, or Kutani look quite similar.