Bilateral fish? Ambassidae？ Bilateral fish are amber fish.
The picture below shows the ancient bilateral fish Ambassis kopsii? (Changda
kopsii)
The fish body is slender, flat on the side, oblong, with curved back and abdomen. Small head, big eyes, big mouth, oblique crack. Jaw, hoe and palate all have fluffy teeth.
Indonesians, Filipinos, Singaporeans and South China Sea of China. It can live in tropical oceans, fresh water, brackish water and other waters. The body length can reach 10.2 cm, which can be used as food fish or ornamental fish. It belongs to bottom migratory fish, generally in coastal and salt water areas, and sometimes swims to fresh water areas to lay eggs. Mainly eat invertebrates.