Ayu, I believe a char (like salmon) not a trout, is indigenous to Japan, and I believe also called ayu in english, and I also swear by it. Toshiba headquarters is in Nasu (Tochigi Prefecture 1.5 hrs N of Tokyo), famous for its streams and rivers, and ayu can be found as a part of every meal there during the summer season. Biases against freshwater fish should be dismissed when you have the opportunity to eat it shioyaki or preserved (sweet soy base).
