Blueback Shadとは 意味・読み方・使い方

Blueback Shad (Alosa aestivalis) is a species of ray-finned fish in the genus Alosa. These fish are silvery in color, have a series of scutes (modified scales that are spiny and keeled) along their belly, and are characterized by deep bluish green backs. The most distinguishing characteristic of this species is the black to dusky in color of its peritoneum (the lining of the abdominal cavity). Blueback herring and alewives are difficult to distinguish from one another and are often regarded collectively as river herring. Alewives have larger eyes, greater body depth, and pearly to white peritoneal linings.