. The comparative physiology of respiratory mechanisms. Respiration. RESPIRATION IN WATER 41 increase is due to the of the respiration muscles. In air breathing forms the cost of increased ventilation is much smaller (p. 68). There can be little doubt that fishes swimming rapidly do not make respiratory movements at all, but obtain the neces- sary ventilation of the gills simply by opening the mouth. Certain fishes, of which the mackerel (Baglioni, 1910; F. G. Hall, 1930) is the best-known example, are constant swimmers. sa tfttfffifffj FIG. 4 Fig. 17. 7. Portion of gill arch in Es
. The comparative physiology of respiratory mechanisms. Respiration. RESPIRATION IN WATER 41 increase is due to the of the respiration muscles. In air breathing forms the cost of increased ventilation is much smaller (p. 68). There can be little doubt that fishes swimming rapidly do not make respiratory movements at all, but obtain the neces- sary ventilation of the gills simply by opening the mouth. Certain fishes, of which the mackerel (Baglioni, 1910; F. G. Hall, 1930) is the best-known example, are constant swimmers. sa tfttfffifffj FIG. 4 Fig. 17. 7. Portion of gill arch in Esox with filaments attached. Magni- fication about 6/1. 2. Similar view from Amia. 3. Section through two gill filaments of Esox. Ca. 65/1. 4. Similar section from Amia with central sup- porting bar Ca. 65 1. (Bevelander.) and have lost the power of ordinary respiration. They cannot therefore be kept in aquaria, but only in ring-shaped or very large basins. G. Bevelander (1931) describes a very peculiar gill structure observed in Amia calva, shown together with that of the pike in Fig. 17. The lamellae of the filaments are joined together so that the whole is honeycombed, and large and very thin- walled capillary surfaces are exposed to the water. This may,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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