Image source: Jo's Animal Database
The Japanese silver-biddy (Gerres equulus) is a species of mojarra native to the coastal waters of the western Pacific Ocean from southern Korea to southern Japan, though it does not occur around the Ryukyu Islands. This species can reach 22.4 cm (8.8 in) in standard length. It is commercially important for the local fish industry in Japan. Dorsal spines (total): 9; Dorsal soft rays (total): 10; Anal spines: 3; Anal soft rays: 7 - 8. U-shaped premaxilla groove entirely without scales, even in large specimens. Posterior margin of maxilla usually not beyond a vertical through anterior margin of inner dermal eye opening (rarely just short of vertical). Scales between 5th dorsal fin spine base 3.5. Body often with 6-8 irregular, dusky, oblique and vertical bands dorsolaterally and ventrolaterally (apparent in juveniles and often observed in large specimens). Pelvic fin vivid or dull yellow with a strong black band and clear white distal margin posteriorly when fresh. Supraneural bones 3.
