balloonfish

　

WordNet

1. similar to but smaller than porcupinefish (同)Diodon holocanthus

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/30 22:13:08」(JST)

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"Blowfish" redirects here. For other uses, see Blowfish (disambiguation).

"Globefish" redirects here. For another fish known with a e "globefish", see Slender-spined porcupine fish.

Pufferfish Temporal range: Lutetian-Holocene Possible Triassic occurrence
Inflated white-spotted puffer
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Class:	Actinopterygii
Subclass:	Neopterygii
Infraclass:	Teleostei
Order:	Tetraodontiformes
Family:	Tetraodontidae Bonaparte, 1832
Genera
See text

Deflated Valentinni's sharpnose puffer

Inflated juvenile spiny puffer fish that was caught in a neuston net tow. Many juvenile puffers live in clumps of floating sargassum seaweed.

Tetraodontidae is a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species, which are variously called pufferfish, puffers, balloonfish, blowfish, bubblefish, globefish, swellfish, toadfish, toadies, honey toads, sugar toads, and sea squab. They are morphologically similar to the closely related porcupinefish, which have large external spines (unlike the thinner, hidden spines of Tetraodontidae, which are only visible when the fish has puffed up). The scientific name refers to the four large teeth, fused into an upper and lower plate, which are used for crushing the shells of crustaceans and mollusks, their natural prey.

The majority of pufferfish species are toxic and some are among the most poisonous vertebrates in the world. In certain species, the internal organs, such as liver, and sometimes their skin, contain tetrodotoxin and are highly toxic to most animals when eaten; nevertheless, the meat of some species is considered a delicacy in Japan (as 河豚, pronounced as fugu), Korea (as 복 bok or 복어 bogeo), and China (as 河豚 hétún) when prepared by specially trained chefs who know which part is safe to eat and in what quantity. Other pufferfish species with non-toxic flesh, such as the northern puffer, Sphoeroides maculatus, of Chesapeake Bay, are considered a delicacy elsewhere.

Genera

The Tetraodontidae contain at least 120 species of puffers in 19 genera.

• Amblyrhynchotes
• Arothron
• Auriglobus
• Canthigaster
• Carinotetraodon
• Chelonodon
• Chonerhinos
• Colomesus
• Contusus
• Ephippion
• Feroxodon
• Guentheridia
• Javichthys
• Lagocephalus
• Leiodon
• Marilyna
• Omegaphora
• Pao
• Pelagocephalus
• Polyspina
• Reicheltia
• Sphoeroides
• Takifugu
• Tetractenos
• Tetraodon
• Torquigener
• Tylerius

Description

They are typically small to medium in size, although a few species can reach lengths of greater than 100 cm (39 in).

Distribution

They are most diverse in the tropics, relatively uncommon in the temperate zone, and completely absent from cold waters.

Ecology and life history

Although most species live in inshore and estuarine waters, 29 species spend their entire lifecycles in fresh water. These species are found in disjunct tropical regions of South America (one species), Central Africa (three species) and Southeast Asia (25 species).

Natural defenses

The puffer's unique and distinctive natural defenses help compensate for its slow locomotion. It moves by combining pectoral, dorsal, anal, and caudal fins. This makes it highly maneuverable, but very slow, and therefore a comparatively easy predation target. Its tail fin is mainly used as a rudder, but it can be used for a sudden evasive burst of speed that shows none of the care and precision of its usual movements. The puffer's excellent eyesight, combined with this speed burst, is the first and most important defense against predators.

Guineafowl puffer – unpuffed and puffed

Its backup defense mechanism, used if successfully pursued, is to fill its extremely elastic stomach with water (or air when outside the water) until it is much larger and almost spherical in shape. Even if they are not visible when the puffer is not inflated, all puffers have pointed spines, so a hungry predator may suddenly find itself facing an unpalatable, pointy ball rather than a slow, tasty fish. Predators which do not heed this warning (or which are "lucky" enough to catch the puffer suddenly, before or during inflation) may die from choking, and predators that do manage to swallow the puffer may find their stomachs full of tetrodotoxin, making puffers an unpleasant, possibly lethal, choice of prey. This neurotoxin is found primarily in the ovaries and liver, although smaller amounts exist in the intestines and skin, as well as trace amounts in muscle. It does not always have a lethal effect on large predators, such as sharks, but it can kill humans.

Not all puffers are necessarily poisonous; the flesh of the northern puffer is not toxic (a level of poison can be found in its viscera) and it is considered a delicacy in North America. Takifugu oblongus, for example, is a fugu puffer that is not poisonous, and toxin level varies wildly even in fish that are. A puffer's neurotoxin is not necessarily as toxic to other animals as it is to humans, and puffers are eaten routinely by some species of fish, such as lizardfish and tiger sharks. Also, Japanese fish farmers have grown nonpoisonous puffers by controlling their diets.

Puffers are able to move their eyes independently, and many species can change the color or intensity of their patterns in response to environmental changes. In these respects, they are somewhat similar to the terrestrial chameleon. Although most puffers are drab, many have bright colors and distinctive markings, and make no attempt to hide from predators. This is likely an example of honestly signaled aposematism.

Reproduction

Many marine puffers have a pelagic, or open-ocean, life stage. Spawning occurs after males slowly push females to the water surface or join females already present. The eggs are spherical and buoyant. Hatching occurs after roughly four days. The fry are tiny, but under magnification have a shape usually reminiscent of a pufferfish. They have a functional mouth and eyes, and must eat within a few days. Brackish-water puffers may breed in bays in a similar manner to marine species, or may breed more similarly to the freshwater species, in cases where they have moved far enough upriver.

Reproduction in freshwater species varies quite a bit. The dwarf puffers court with males following females, possibly displaying the crests and keels unique to this subgroup of species. After the female accepts his advances, she will lead the male into plants or another form of cover, where she can release eggs for fertilization. The male may help her by rubbing against her side. This has been observed in captivity, and they are the only commonly captive-spawned puffer species.

Target-group puffers have also been spawned in aquariums, and follow a similar courting behavior, minus the crest/keel display. However, eggs are laid on a flat piece of slate or other smooth, hard material, to which they adhere. The male will guard them until they hatch, carefully blowing water over them regularly to keep the eggs healthy. His parenting is finished when the young hatch, and the fry are on their own.

Information on breeding of specific species is very limited. T. nigroviridis, the green-spotted puffer, has recently been artificially spawned under captive conditions. It is believed to spawn in bays in a similar manner to saltwater species, as their sperm was found to be motile only at full marine salinities, but actual wild breeding has never been observed.

In 2012, males of the species Torquigener albomaculosus were documented carving large geometric, circular structures in the seabed sand in Amami Ōshima, Japan. The structures apparently serve to attract females and provide a safe place for them to lay their eggs.

• Spots, stripes and elaborations
• White-spotted puffer

• Striped puffer

• Elaborate skin pattern of the giant or mbu puffer

Evolution

The tetraodontids have been estimated to diverge from diodontids between 89 and 138 million years ago. The four major clades diverged during the Cretaceous between 80 and 101 million years ago. The oldest known pufferfish genus is Eotetraodon, from the Lutetian epoch of Middle Eocene Europe, with fossils found in Monte Bolca and the Caucasus Mountains. The Monte Bolca species, E. pygmaeus, coexisted with several other tetraodontiforms, including an extinct species of diodontid, primitive boxfish (Proaracana and Eolactoria), and other, totally extinct forms, such as Zignoichthys and the spinacanthids. The extinct genus, Archaeotetraodon is known from Miocene-aged fossils from Europe.

Fossil teeth of a possible tetraodontid (referred to as "Pekinosaurus hyperostosis") have been found in the Triassic Pekin Formation of North Carolina, possibly extending their range.

Human interaction

Poisoning

Arothron hispidus at Big Island of Hawaii

Stuffed specimen from 1710.

Pufferfish can be lethal if not served properly. Puffer poisoning usually results from consumption of incorrectly prepared puffer soup, fugu chiri, or occasionally from raw puffer meat, sashimi fugu. While chiri is much more likely to cause death, sashimi fugu often causes intoxication, light-headedness, and numbness of the lips, and is often eaten for this reason. Pufferfish tetrodotoxin deadens the tongue and lips, and induces dizziness and vomiting, followed by numbness and prickling over the body, rapid heart rate, decreased blood pressure, and muscle paralysis. The toxin paralyzes diaphragm muscles and stops the person who has ingested it from breathing. People who live longer than 24 hours typically survive, although possibly after a coma lasting several days.

The source of tetrodotoxin in puffers has been a matter of debate, but it is increasingly accepted that bacteria in the fish's intestinal tract are the source.

Saxitoxin, the cause of paralytic shellfish poisoning and red tide, can also be found in certain puffers.

With a pufferfish in Costa Rica

Thailand

Pufferfish, called pakpao in Thailand, are usually consumed by mistake. They are often cheaper than other fish, and because they contain inconsistent levels of toxins between fish and season, there is little awareness or monitoring of the danger. Consumers are regularly hospitalized and some even die from the poisoning.

United States

Cases of neurological symptoms, including numbness and tingling of the lips and mouth, have been reported to rise after the consumption of puffers caught in the area of Titusville, Florida, U.S. The symptoms generally resolve within hours to days, although one affected individual required intubation for 72 hours. As a result, Florida banned the harvesting of puffers from certain bodies of water.

The Philippines

The Bureau of Fisheries and Aquatic Resources issued a warning not to eat puffer fish, locally known as butete, after local fishermen died upon consuming puffer fish for dinner. The warning indicated that puffer fish toxin is 100 times more potent than cyanide.

Poisoning treatment

Treatment consists of intestinal decontamination with gastric lavage and activated charcoal. Case reports suggest anticholinesterases such as edrophonium may be effective.

See also

• Shimonoseki – Japanese city known for its locally caught pufferfish

References

Bibliography

• Arreola, V.I., and M.W. Westneat. 1996. Mechanics of propulsion by multiple fins: kinematics of aquatic locomotion in the burrfish (Chilomycterus schoepfi). Proceedings of the Royal Society of London B 263: 1689–1696.
• Ebert, Klaus (2001): The Puffers of Fresh and Brackish Water, Aqualog, ISBN 3-931702-60-X.
• Gordon, M.S., Plaut, I., and D. Kim. 1996. How puffers (Teleostei: Tetraodontidae) swim. Journal of Fish Biology 49: 319–328.
• Plaut, I. and T. Chen. 2003. How small puffers (Teleostei: Tetraodontidae) swim. Ichthyological Research

External links

• Fugu sequencing project at the Wayback Machine (archived March 22, 2009)
• Tetraodon sequencing project
• EMedicine Article about the Toxicity of Tetrodotoxin
• FishBase listing for Tetraodontidae
• A Library of Puffer Fish DNA: Smithsonian Institution's Ocean Portal
• Fisheries Western Australia - Common blowfish Fact Sheet
• Underwater crop circles from Japan are an amazing form of biological art
• Puffer has hook removed from mouth by scuba diver
• Dolphins 'getting high' on puffer fish, zoologist Rob Pilley says news.com.au, 30 December 2013.
• How Puffer fish protect itself at the Wayback Machine (archived March 7, 2014) Video on How puffer fishes blow up

Japanese Journal

• 南米産淡水エイとハリセンボンの肝組織について〔英文〕

• 小栗 幹郎
• 日本水産学会誌 51(5), 717-720, 1985
• … and the balloonfish Diodon holacanthus, an investigation was carried out on the liver size and the amount of fat droplets in hepatocytes and the following results were obtained. … On the other hand, the liver of the balloonfish was relatively large in size among Osterichthyes and the value of HSI on three specimens was 5.74±0.38%. … Thus, the livers in the freshwater stingrays and the balloonfish were confirmed as the so-called "physiologi-cally fatty liver." …
• NAID 130001543282

Related Pictures