The upper reaches of the deep ocean contain many bathypelagic fishes with a capacious, gas-filled swimbladder. |
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Accordingly, the swimbladder itself is the source of the most complex forms of sound production in many groups. |
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In most fossil coelacanths, the swimbladder appears to be ossified and, consequently, these fishes were probably confined to shallow water. |
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While toadfish and their swimbladder muscles continue to grow throughout life, the cells appear to continue to divide and remain relatively small. |
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Recently, this parasite was shown to inhibit the function of the swimbladder as a hydrostatic organ. |
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These vertical migrations often occur over a large vertical distances, and are undertaken with the assistance of a swimbladder. |
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As the fish ascends, the pressure in the swimbladder must adjust to prevent it from bursting. |
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When the fish wants to return to the depths, the swimbladder is deflated. |
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The swimbladder is inflated when the fish wants to move up, and, given the high pressures in the messoplegic zone, this requires significant energy. |
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