he Japanese silver-biddy (Gerres japonicus) is a marine fish species widely distributed along the coastal waters of Japan, the East China Sea, and the northwestern Pacific Ocean. Belonging to the family Gerreidae, it is a relatively small fish, typically measuring 15 to 25 centimeters in length. Its body is laterally compressed and oval-shaped, with a shiny silver coloration and metallic luster. The fins are transparent, and the slightly protruding mouth is capable of extending forward to catch prey—making it easily recognizable.

This species commonly inhabits sandy and muddy bottoms near coastal areas or brackish waters around river estuaries. It is known for its strong schooling behavior and active movement. The Japanese silver-biddy feeds primarily on benthic invertebrates, such as small crustaceans and polychaete worms, making it a classic bottom-feeding fish.

In Japan, it is a popular food fish, valued for its tender texture and delicate flavor. With low fat content, it is well-suited for a variety of cooking methods, including deep-frying, grilling, simmering, and tempura. Thanks to its nutritional value and affordability, the Japanese silver-biddy is a staple in household meals and local markets, widely appreciated by consumers across the country.