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The pressures in the buccal cavities of Golden orfe (Idus idus) have been recorded as the fish took food from a tube connected to a pressure transducer. Pressures 50–105 cm water below the pressure of the surrounding water were recorded as the buccal cavity expanded to suck the food in. Calculations based on the dimensions of the muscles lead to the conclusion that the levatores hyoidei, sternohyoideus, rectus abdominis, epaxial trunk muscles and obliquus internus probably all had to exert almost their maximum isometric tensions, to produce the largest reductions of pressure. These muscles seem nicely balanced in strength for their functions in feeding.