Burggren W W
Respir Physiol. 1978 Aug;34(2):153-70. doi: 10.1016/0034-5687(78)90025-7.
Measurements of branchial cavity water pressures and flow patterns, arterial blood PO2 and pH, and oxygen utilization and uptake have been made in undisturbed, free swimming sturgeon, Acipenser transmontanus. Although the jaws are degenerate and the oral apparatus is highly modified for feeding, gill ventilation is nonetheless powered by a buccal force pump and an opercular suction pump common to most bony fishes. The reduced spiracles play little or no role in gill ventilation. In sturgeon in which water intake through the ventrally located mouth was experimentally eliminated, a condition which may often develop when these fish forage in mud and sand on river substrates, effective ventilation of the gills was maintained with water drawn into the branchial cavities in a retrograde fashion solely through permanent openings in the upper regions of the opercular slits. O2 uptake and transport also remained at control levels. It is suggested that this unusual alternative mode of gill ventilation in the sturgeon represents an important respiratory adaptation to bottom dwelling and feeding.
对未受干扰、自由游动的高首鲟（Acipenser transmontanus）的鳃腔水压和水流模式、动脉血的氧分压和pH值以及氧的利用和摄取进行了测量。尽管其颌部退化，摄食口器高度特化，但鳃的通气仍然由大多数硬骨鱼类共有的口腔压力泵和鳃盖抽吸泵驱动。退化的喷水孔在鳃通气中作用很小或不起作用。在通过实验消除了从位于腹面的口进水的高首鲟中（当这些鱼在河底的泥沙中觅食时，这种情况可能经常发生），仅通过鳃盖裂缝上部的永久性开口，以逆行方式将水吸入鳃腔，鳃仍能有效通气。氧气的摄取和运输也保持在对照水平。有人认为，高首鲟这种不寻常的鳃通气替代模式代表了对底栖生活和摄食的一种重要呼吸适应。
