Lagoons and coastal bottoms
Mangrove-lined lagoons are a characteristic setting, alongside shallow marine areas with sand or mud. Juveniles occur in both brackish and hypersaline lagoons. The species therefore occupies coastal waters with quite different salt concentrations, rather than being restricted to ordinary seawater.
Sources: Diapterus rhombeus species summary
Feeding
The summary suggests small bottom-dwelling invertebrates as prey, but presents that diet as probable rather than firmly established. This uncertainty matters when comparing the species with other mojarras: a plausible feeding pattern should not be converted into a precise, verified list of prey.
Sources: Diapterus rhombeus species summary
