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Studies of a physostome swimbladder by resonance frequency analyses
Sundnes, G.; Sand, O., Olav (1975). Studies of a physostome swimbladder by resonance frequency analyses. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 36(2): 176-182
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139, more
Peer reviewed article  

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    Biophysics; Physiology; Swim bladder; Salmo alpinus Linnaeus, 1758 [WoRMS]; Marine

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  • Sundnes, G.
  • Sand, O.

    The resonance frequency of the swimbladder was measured for intactiliving charr (Salmo alpinus) at different depths. The acoustical behaviour of the charr swimbladder was similar to that of a free bubble of gas varying with depth in a similar manner. however, due to shape and tissue effects, the resonance frequency of the charr swimbladder was {approx} 40% higher than for a comparable free bubble. The swimbladder vol was calculated from the resonance frequency of bladder, and the vol changes which occurred with time were recorded for fish dept at a certain constant depth without access to the surface 4 different patterns of vol/time relationships were observed; (a) the calculated swimbladder vol could show a sudden decrease, probably due to gas releases through the pneumatic duct; (b) a gradual decrease of swimbladder vol occurred with time, probably because of loss by diffusion; (c) an apparent constant swimbladder vol occurred, indicating that the gas lost by diffusion might be fully compensated; (d) in 1 case the apparent volume of the swimblader in creased 44% in 20 hr. Charr therefore possesses a gas filling mechanism in addition to the swallowing of gas at the surface. Since charr have no gas gland, this gas filling mechanism may be different from that described for physoclists.

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