From your picture, this is tongue sole.

One of the most valuable economic fish in the ocean. Each hundred grams contains 13.7 grams of protein, 1.2 grams of fat and delicate meat flavor, especially in the summer flood season caught the most fertile fish, eating fresh fat and not greasy.

Braised tongue sole is one of the famous dishes. In addition to fresh food can also be processed into salted and dried products.