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Pharyngeal jaw movements in Oreochromis niloticus (Teleostei : Cichlidae): Preliminary results of a cineradiographic analysis
Aerts, P.; De Vree, F.; Vandewalle, P. (1986). Pharyngeal jaw movements in Oreochromis niloticus (Teleostei : Cichlidae): Preliminary results of a cineradiographic analysis. Ann. Soc. R. Zool. Bel. 116(1): 75-82
In: Annales de la Société Royale Zoologique de Belgique = Annalen van de Koninklijke Belgische Vereniging voor Dierkunde. Société Royale Zoologique de Belgique: Bruxelles. ISSN 0771-5528, more
Peer reviewed article  
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Keywords
    Oreochromis niloticus (Linnaeus, 1758) [WoRMS]
    Brackish water
Authors  Top 
  • Aerts, P., more
  • De Vree, F.
  • Vandewalle, P., more
Abstract
    Feeding in Oreochromis niloticus (implanted with metallic markers in the bones) was studied by cineradiography (50 fr/s) along lateral and dorso-ventral axes to visualize the movement patterns of the pharyngeal jaws during the different phases of food uptake. The images were digitized and plotted, indicating that the food particles are macerated in a single power stroke. During this cyclic movement the caudally pointing teeth of the upper pharyngeal jaw and the rostrally pointing teeth of the lower pharyngeal jaw move in opposite directions. The stereotyped movement pattern is not affected, either by varying size or varying hardness of the food items.
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