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Encyclopedia > Gas bladder
 The gas bladder of a Rudd
The gas bladder of a Rudd

The gas bladder (also fish maw, less accurately swim bladder or air bladder) is an internal organ that contributes to the ability of a fish to control its buoyancy, and thus to stay at the current water depth, ascend, or descend without having to waste energy in swimming. Image File history File linksMetadata Swim_bladder. ... Image File history File linksMetadata Swim_bladder. ... Binomial name Scardinius erythrophthalmus (Linneaus, 1758) The Rudd (Scardinius erythrophthalmus) is a small fish, a widespread member of the family Cyprinidae. ... A giant grouper at the Georgia Aquarium Fish are aquatic vertebrates that are typically cold-blooded; covered with scales, and equipped with two sets of paired fins and several unpaired fins. ... // In physics, buoyancy is the upward force on an object produced by the surrounding fluid (i. ...

its volume and thus increase buoyancy, termed a physoclistous gas bladder. To reduce buoyancy, gases are released from the bladder into the blood stream and then expelled into the water via the gills. In order to introduce gas into the bladder, the gas gland excretes lactic acid; the resulting acidity causes the hemoglobin of the blood to lose its oxygen, which then diffuses into the bladder while flowing through a complex structure known as the rete mirabile. Elsewhere, at a similar structure known as the oval window, the bladder is in contact with blood and the oxygen can diffuse back. Lactic acid (IUPAC systematic name: 2-hydroxypropanoic acid), also known as milk acid, is a chemical compound that plays a role in several biochemical processes. ... 3-dimensional structure of hemoglobin. ... This article or section does not cite its references or sources. ... A rete mirabile (Latin for wonderful net) is a complex of arteries and veins lying very close to each other, found in a number of vertebrates, and serving different purposes. ...

Physoclist gas 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. Gas bladders are only found in ray-finned fish, but a few of these fish that do not need to change water depth have lost them. Many cartilaginous fish, including sharks, can control their depth only by swimming (using dynamic lift); others store fats or oils for the purpose. Orders See text The Actinopterygii are the ray-finned fish. ... Orders Carcharhiniformes Heterodontiformes Hexanchiformes Lamniformes Orectolobiformes Pristiophoriformes Squaliformes Squatiniformes Sharks (superorder Selachimorpha) are fish with a full cartilaginous skeleton[1] and a streamlined body. ... The prevailing type of fish locomotion is swimming in water. ...

In some fish, mainly freshwater species, the gas bladder is connected to the labyrinth of the inner ear by the Weberian apparatus, which provides a precise sense of water pressure (and thus depth), and may also improve hearing. Bat ears come in different sizes and shapes The ear is the sense organ that detects sound. ... The Weberian apparatus is a set of bones that transmit vibrations to the inner ear of some fish. ... Water pressure is the pressure in any system for supplying water, usually a domestic water system, although the term is used in other contexts as well, such as a municipal water system. ...

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 gas bladder. Layers of Atmosphere (NOAA) Air redirects here. ... For other uses, see Eel (disambiguation). ... Binomial name Synaphobranchus affinis Günther, 1877 The grey cutthroat eel, Synaphobranchus affinis, is a cutthroat eel, the only species in the genus Synaphobranchus. ... General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ... Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. ... General Name, Symbol, Number argon, Ar, 18 Chemical series noble gases Group, Period, Block 18, 3, p Appearance colorless Atomic mass 39. ...

Gas bladders are evolutionarily closely related (i.e. homologous) to lungs. It is believed that the first lungs, simple sacs that allowed the organism to gulp air under oxygen-poor conditions, evolved into the lungs of today's terrestrial vertebrates and into the gas bladders of today's fish. In embryonal development, both lung and gas bladder originate as an outpocketing from the gut; in the case of gas bladders, this connection to the gut continues to exist as the pneumatic duct in more "primitive" teleosts, and is lost in the more derived orders. There are no animals which have both lungs and a gas bladder. In biology, two or more structures are said to be homologous if they are alike because of shared ancestry. ... The lungs flank the heart and great vessels in the chest cavity. ... For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and... Superorders Osteoglossomorpha Elopomorpha Clupeomorpha Ostariophysi Protacanthopterygii Sternopterygii Cyclosquamata Scopelomorpha Lampridiomorpha Polymyxiomorpha Paracanthopterygii Polymyxiomorpha Acanthopterygii Teleostei is one of three infraclasses in class Actinopterygii, the ray-finned fishes. ...

Human uses

In some Asian cultures, fish maw is considered a food delicacy. Usually served braised or in stews, it is rather tasteless by itself, but it is enjoyed more for its slightly rubbery and crunchy texture.

Gas bladders in other animals

The Portuguese Man o' War has a special gas bladder that allows its top to float always along the surface while its tentacles trail below the water. This organ is unrelated to the one in fish. This article is about the marine invetebrate. ...


  • Carl E. Bond, Biology of Fishes, 2nd ed., (Saunders, 1996) pp. 283-290.

  Results from FactBites:
Information on Fish Gas Bladder (813 words)
The reason for this is that as pressure increases with depth, the gas in the bladder is compressed, decreasing the bladder's volume and increasing the relative density of the fish.
If, as in the carp, the gas bladder is connected by a duct to the gullet, gas may be expelled through the mouth and gill cavities as the fish rises, and, in a similar manner, gas may be added to the bladder by swallowing air at the water surface.
The gas gland is a modification of the inner lining of the bladder; the rete mirabile is a dense bundle of capillaries arranged side by side in countercurrent fashion.
Gas bladder - Wikipedia, the free encyclopedia (649 words)
The gas bladder (also fish maw, less accurately swim bladder or air bladder) is an internal organ that contributes to the ability of a fish to control its buoyancy, and thus to stay at the current water depth, ascend, or descend without having to waste energy in swimming.
The gas bladder is a gas-filled sac located in the dorsal portion of the fish.
In physostomous gas bladders, a connection is retained between the gas bladder and the gut, allowing the fish to fill up the gas bladder by "gulping" air and filling the gas bladder through the pneumatic duct.
  More results at FactBites »



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