Gas Secretion and Absorption
One clear advantage of having a swimbladder is that little to no extra energy is necessary in order to remain stationary at a constant level of water. Only a slight control by use of the pectoral fins is required to balance out the propulsive force of water exiting the gills. Fish with no swimbladder on the other hand, such as mackerels, sharks, and rays must expend energy by constantly swimming in order to keep from sinking.
| Another advantage of swimbladders is
oxygen storage. Physoclists and physostomes alike may occasionally
use the oxygen present within their bladder as an emergency backup in times
of urgent need, although, this emergency store can only be of aid for a
few minutes (Jones 1957).
Finally, swimbladders in some fish are known to increase hearing abilities. With the presence of inner ear- swimbladder connections, these fish have exhibited greater sensitivity to sound, however it is not yet clear whether there is also an increase in frequency selectivity (Coombs & Popper 1982a)
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