The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to waste energy in swimming. Also, the dorsal position of the swim bladder means the center of mass is below the center of volume, allowing it to act as a stabilizing agent. Additionally, the swim bladder functions as a resonating chamber, to produce or receive sound.
The swim bladder is evolutionarily homologous to the lungs. Charles Darwin remarked upon this in On the Origin of Species. Darwin reasoned that the lung in air-breathing vertebrates had derived from a more primitive swim bladder.
In the embryonic stages, some species, such as redlip blenny, have lost the swim bladder again, mostly bottom dwellers like the weather fish. Other fish—like the opah and the pomfret—use their pectoral fins to swim and balance the weight of the head to keep a horizontal position. The normally bottom dwelling sea robin can use their pectoral fins to produce lift while swimming.
The gas/tissue interface at the swim bladder produces a strong reflection of sound, which is used in sonar equipment to find fish.
Cartilaginous fish, such as sharks and rays, do not have swim bladders. Some of them can control their depth only by swimming (using dynamic lift); others store fats or oils with density less than that of seawater to produce a neutral or near neutral buoyancy, which does not change with depth.
Structure and function
The swim bladder normally consists of two gas-filled sacs located in the dorsal portion of the fish, although in a few primitive species, there is only a single sac. It has flexible walls that contract or expand according to the ambient pressure. The walls of the bladder contain very few blood vessels and are lined with guanine crystals, which make them impermeable to gases. By adjusting the gas pressurising organ using the gas gland or oval window the fish can obtain neutral buoyancy and ascend and descend to a large range of depths. Due to the dorsal position it gives the fish lateral stability.
In physostomous swim bladders, a connection is retained between the swim bladder and the gut, the pneumatic duct, allowing the fish to fill up the swim bladder by "gulping" air. Excess gas can be removed in a similar manner.
In more derived varieties of fish (the physoclisti) the connection to the digestive tract is lost. In early life stages, these fish must rise to the surface to fill up their swim bladders; in later stages, the pneumatic duct disappears, and the gas gland has to introduce gas (usually oxygen) to the bladder to increase its volume and thus increase buoyancy. In order to introduce gas into the bladder, the gas gland excretes lactic acid and produces carbon dioxide. The resulting acidity causes the hemoglobin of the blood to lose its oxygen (Root effect) which then diffuses partly into the swim bladder. The blood flowing back to the body first enters a rete mirabile where virtually all the excess carbon dioxide and oxygen produced in the gas gland diffuses back to the arteries supplying the gas gland. Thus a very high gas pressure of oxygen can be obtained, which can even account for the presence of gas in the swim bladders of deep sea fish like the eel, requiring a pressure of hundreds of bars. Elsewhere, at a similar structure known as the oval window, the bladder is in contact with blood and the oxygen can diffuse back out again. Together with oxygen, other gases are salted out[clarification needed] in the swim bladder which accounts for the high pressures of other gases as well.
The combination of gases in the bladder varies. In shallow water fish, the ratios closely approximate that of the atmosphere, while deep sea fish tend to have higher percentages of oxygen. For instance, the eel Synaphobranchus has been observed to have 75.1% oxygen, 20.5% nitrogen, 3.1% carbon dioxide, and 0.4% argon in its swim bladder.
Physoclist swim bladders have one important disadvantage: they prohibit fast rising, as the bladder would burst. Physostomes can "burp" out gas, though this complicates the process of re-submergence.
The swim bladder in some species, mainly fresh water fishes (common carp, catfish, bowfin) is interconnected with the inner ear of the fish. They are connected by four bones called the Weberian ossicles from the Weberian apparatus. These bones can carry the vibrations to the saccule and the lagena (anatomy). They are suited for detecting sound and vibrations due to its low density in comparison to the density of the fish's body tissues. This increases the ability of sound detection. The swim bladder can radiate the pressure of sound which help increase its sensitivity and expand its hearing. In some deep sea fishes like the Antimora, the swim bladder maybe also connected to the macula of saccule in order for the inner ear to receive a sensation from the sound pressure. In red-bellied piranha, the swimbladder may play an important role in sound production as a resonator. The sounds created by piranhas are generated through rapid contractions of the sonic muscles and is associated with the swimbladder.
Teleosts are thought to lack a sense of absolute hydrostatic pressure, which could be used to determine absolute depth. However, it has been suggested that teleosts may be able to determine their depth by sensing the rate of change of swim-bladder volume.
Swim bladders are evolutionarily closely related (i.e., homologous) to lungs. Traditional wisdom has long held that the first lungs, simple sacs connected to the gut that allowed the organism to gulp air under oxygen-poor conditions, evolved into the lungs of today's terrestrial vertebrates and some fish (e.g., lungfish, gar, and bichir) and into the swim bladders of the ray-finned fish. In 1997, Farmer proposed that lungs evolved to supply the heart with oxygen. In fish, blood circulates from the gills to the skeletal muscle, and only then to the heart. During intense exercise, the oxygen in the blood gets used by the skeletal muscle before the blood reaches the heart. Primitive lungs gave an advantage by supplying the heart with oxygenated blood via the cardiac shunt. This theory is robustly supported by the fossil record, the ecology of extant air-breathing fishes, and the physiology of extant fishes. In embryonal development, both lung and swim bladder originate as an outpocketing from the gut; in the case of swim bladders, this connection to the gut continues to exist as the pneumatic duct in the more "primitive" ray-finned fish, and is lost in some of the more derived teleost orders. There are no animals which have both lungs and a swim bladder.
The cartilaginous fish (e.g., sharks and rays) split from the other fishes about 420 million years ago, and lack both lungs and swim bladders, suggesting that these structures evolved after that split. Correspondingly, these fish also have both heterocercal and stiff, wing-like pectoral fins which provide the necessary lift needed due to the lack of swim bladders. Teleost fish with swim bladders have neutral buoyancy, and have no need for this lift.
Deep scattering layer
Sonar operators, using the newly developed sonar technology during World War II, were puzzled by what appeared to be a false sea floor 300–500 metres deep at day, and less deep at night. This turned out to be due to millions of marine organisms, most particularly small mesopelagic fish, with swimbladders that reflected the sonar. These organisms migrate up into shallower water at dusk to feed on plankton. The layer is deeper when the moon is out, and can become shallower when clouds obscure the moon.
Most mesopelagic fish make daily vertical migrations, moving at night into the epipelagic zone, often following similar migrations of zooplankton, and returning to the depths for safety during the day. These vertical migrations often occur over large vertical distances, and are undertaken with the assistance of a swim bladder. The swim bladder is inflated when the fish wants to move up, and, given the high pressures in the mesoplegic zone, this requires significant energy. As the fish ascends, the pressure in the swimbladder must adjust to prevent it from bursting. When the fish wants to return to the depths, the swimbladder is deflated. Some mesopelagic fishes make daily migrations through the thermocline, where the temperature changes between 10 and 20 °C, thus displaying considerable tolerance for temperature change.
Sampling via deep trawling indicates that lanternfish account for as much as 65% of all deep sea fish biomass. Indeed, lanternfish are among the most widely distributed, populous, and diverse of all vertebrates, playing an important ecological role as prey for larger organisms. The estimated global biomass of lanternfish is 550–660 million metric tonnes, several times the entire world fisheries catch. Lanternfish also account for much of the biomass responsible for the deep scattering layer of the world's oceans. Sonar reflects off the millions of lanternfish swim bladders, giving the appearance of a false bottom.
In some Asian cultures, the swim bladders of certain large fishes are considered a food delicacy. In China they are known as fish maw, 花膠/鱼鳔, and are served in soups or stews.
The vanity price of a vanishing kind of maw is behind the imminent extinction of the vaquita, the world's smallest dolphin species. Found only in Mexico's Gulf of California, the once numerous vaquita now number less than 60 in total. Vaquita die in gillnets set to catch totoaba (the world's largest drum fish). Totoaba are being hunted to extinction for its maw, which can sell for as much $10,000 per kilogram.
Swim bladders are also used in the food industry as a source of collagen. They can be made into a strong, water-resistant glue, or used to make isinglass for the clarification of beer. In earlier times they were used to make condoms.
Swim bladder disease
Risk of injury
Many anthropogenic activities, like pile driving or even Seismic wave, that could result from climate change or natural causes, can create high-intensity sound waves that cause a certain amount of damage to fish that possess a gas bladder. Physostomes can release air in order to decrease the tension in the gas bladder that may cause internal injuries to other vital organs, while physoclisti can't expel air fast enough, making it more difficult to avoid any major injuries. Some of the commonly seen injuries included ruptured gas bladder and renal Haemorrhage. These mostly affect the overall health of the fish and didn't affect their mortality rate. Investigators used the High-Intensity-Controlled Impedance Fluid Filled (HICI-FT), a stainless-steel wave tube with an electromagnetic shaker. It simulates high-energy sound waves in aquatic far-field, plane-wave acoustic conditions.
Similar structures in other organisms
Siphonophores have a special swim bladder that allows the jellyfish-like colonies to float along the surface of the water while their tentacles trail below. This organ is unrelated to the one in fish.
Swim bladder display in a Malacca shopping mall
- "More on Morphology". www.ucmp.berkeley.edu.
- "Fish". Microsoft Encarta Encyclopedia Deluxe 1999. Microsoft. 1999.
- Darwin, Charles (1859) Origin of Species Page 190, reprinted 1872 by D. Appleton.
- Nursall, J. R. (1989). "Buoyancy is provided by lipids of larval redlip blennies, Ophioblennius atlanticus". Copeia. 1989 (3): 614–621. doi:10.2307/1445488. JSTOR 1445488.
- Pelster B (December 2001). "The generation of hyperbaric oxygen tensions in fish". News Physiol. Sci. 16 (6): 287–91. PMID 11719607.
- "Secretion Of Nitrogen Into The Swimbladder Of Fish. Ii. Molecular Mechanism. Secretion Of Noble Gases". Biolbull.org. 1981-12-01. Retrieved 2013-06-24.
- Kardong, Kenneth. Vertebrates: Comparative Anatomy, Function, Evolution. New York: McGraw-Hill Education. p. 701. ISBN 9780073524238.
- Deng, Xiaohong; Wagner, Hans-Joachim; Popper, Arthur N. (2011-01-01). "The inner ear and its coupling to the swim bladder in the deep-sea fish Antimora rostrata (Teleostei: Moridae)". Deep Sea Research Part I: Oceanographic Research Papers. 58 (1): 27–37. doi:10.1016/j.dsr.2010.11.001. PMC 3082141. PMID 21532967.
- Onuki, A; Ohmori Y.; Somiya H. (January 2006). "Spinal Nerve Innervation to the Sonic Muscle and Sonic Motor Nucleus in Red Piranha, Pygocentrus nattereri (Characiformes, Ostariophysi)". Brain, Behavior and Evolution. 67 (2): 11–122. doi:10.1159/000089185. PMID 16254416.
- Bone, Q.; Moore, Richard H. (2008). Biology of fishes (3rd., Thoroughly updated and rev ed.). Taylor & Francis. ISBN 9780415375627.
- Taylor, Graham K.; Holbrook, Robert Iain; de Perera, Theresa Burt (6 September 2010). "Fractional rate of change of swim-bladder volume is reliably related to absolute depth during vertical displacements in teleost fish". Journal of the Royal Society Interface. 7 (50): 1379–1382. doi:10.1098/rsif.2009.0522. PMC 2894882. PMID 20190038.
- Farmer, Colleen (1997). "Did lungs and the intracardiac shunt evolve to oxygenate the heart in vertebrates" (PDF). Paleobiology. 23 (3): 358–372. doi:10.1017/S0094837300019734.
- Kardong, KV (1998) Vertebrates: Comparative Anatomy, Function, Evolution2nd edition, illustrated, revised. Published by WCB/McGraw-Hill, p. 12 ISBN 0-697-28654-1
- Ryan P "Deep-sea creatures: The mesopelagic zone" Te Ara - the Encyclopedia of New Zealand. Updated 21 September 2007.
- Moyle, Peter B.; Cech, Joseph J. (2004). Fishes : an introduction to ichthyology (5th ed.). Upper Saddle River, N.J.: Pearson/Prentice Hall. p. 585. ISBN 9780131008472.
- Bone, Quentin; Moore, Richard H. (2008). "Chapter 2.3. Marine habitats. Mesopelagic fishes". Biology of fishes (3rd ed.). New York: Taylor & Francis. p. 38. ISBN 9780203885222.
- Douglas EL, Friedl WA and Pickwell GV (1976) "Fishes in oxygen-minimum zones: blood oxygenation characteristics" Science, 191 (4230) 957–959.
- Hulley, P. Alexander (1998). Paxton, J.R.; Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. pp. 127–128. ISBN 978-0-12-547665-2.
- R. Cornejo; R. Koppelmann & T. Sutton. "Deep-sea fish diversity and ecology in the benthic boundary layer".
- Teresa M. (2009) A Tradition of Soup: Flavors from China's Pearl River Delta Page 70, North Atlantic Books. ISBN 9781556437656.
- "'Extinction Is Imminent': New report from Vaquita Recovery Team (CIRVA) is released". IUCN SSC - Cetacean Specialist Group. 2016-06-06. Retrieved 2017-01-25.
- Bridge, T. W. (1905)  "The Natural History of Isinglass"
- Huxley, Julian (1957) "Material of early contraceptive sheaths." British Medical Journal, 1 (5018): 581–582.
- Johnson, Erik L. and Richard E. Hess (2006) Fancy Goldfish: A Complete Guide to Care and Collecting, Weatherhill, Shambhala Publications, Inc. ISBN 0-8348-0448-4
- Halvorsen, Michele B.; Casper, Brandon M.; Matthews, Frazer; Carlson, Thomas J.; Popper, Arthur N. (2012-12-07). "Effects of exposure to pile-driving sounds on the lake sturgeon, Nile tilapia and hogchoker". Proceedings of the Royal Society B: Biological Sciences. 279 (1748): 4705–4714. doi:10.1098/rspb.2012.1544. ISSN 0962-8452. PMC 3497083. PMID 23055066.
- Halvorsen, Michele B.; Casper, Brandon M.; Woodley, Christa M.; Carlson, Thomas J.; Popper, Arthur N. (2012-06-20). "Threshold for Onset of Injury in Chinook Salmon from Exposure to Impulsive Pile Driving Sounds". PLOS ONE. 7 (6): e38968. doi:10.1371/journal.pone.0038968. ISSN 1932-6203. PMC 3380060. PMID 22745695.
- Popper, Arthur N.; Hawkins, Anthony (2012-01-26). The Effects of Noise on Aquatic Life. Springer Science & Business Media. ISBN 9781441973115.
- Clark, F. E.; C. E. Lane (1961). "Composition of float gases of Physalia physalis". Fed. Proc. 107 (3): 673–674. doi:10.3181/00379727-107-26724.
|Wikimedia Commons has media related to Swim bladder.|