We studied prey processing in the Siamese fighting fish Betta splendens, related to slow, easily observed head bobbing routine, which have been compared with prey processing in other aquatic feeding vertebrates. We hypothesized that head bobbing is a unique prey processing behaviour, which as an alternative could be structurally and functionally analogous with raking in basal teleosts, or with pharyngognathy in neoteleosts. Modulation of head bobbing was elicited by prey with different motility and durability. Head bobbing concerned sustained mouth occlusion and reported cranial elevation, akin to raking. However, the hyoid and pectoral girdle were protracted, and never retracted as in both raking and pharyngognathy. High speed videofluoroscopy of hyoid pursuits confirmed that head bobbing differs from other known aquatic prey processing behaviours.