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THE SWIMBLADDER OF FISHES AS A PRESSURE RECEPTOR by ZIAD QUTOB (Laboratory of Comparative Physiology, University of Utrecht, Netherlands) 2 . INTRODUCTION It is a well known fact that fishes perceive the pressure changes in their environment and respond by one or more reflexes according to the quality, the quantity, and the duration of the mentioned stimulus. The commonly known reflexes are the compensatory swimming move- ments, the swallowing or spitting of gas bubbles (in physostomous teleosts), and the secretion or resorption of the gaseous components. The remaining question always was the site of the pressure change perception and the real stimulus to which fishes respond when pressure changes are brought about in the environment. Some investigators believe that the pressure change induces a deformation of the swim- bladder wall, and thus stimulates the extensive nerve endings located within it or within the surrounding tissues. Others believe that when a means of connection is found between the swimbladder and the laby- rinth, the changes in the swimbladder volume which are caused by pressure changes would be transferred to the labyrinth through this connection. That connection may be formed either by means of two anterior diverticula of the bladder
Archives Néerlandaises de Zoologie (in 1967 continued as Netherlands Journal of Zoology) – Brill
Published: Jan 1, 1963
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