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36-432: The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or members of the argonaut group of octopus . The concept has been invented and reinvented many times by humans to serve a variety of purposes. In the fifteenth and sixteenth century, the ballast "did not consist entirely of leakage, but of urine, vomit, and various foul food leavings that lazy sailors discharged into

72-506: 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. In September 2012, the Bureau of Fisheries and Aquatic Resources in the Philippines issued

108-405: 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. The pufferfish's secondary defense mechanism, used if successfully pursued,

144-515: A completely vegetarian diet if their environment is lacking resources, but prefer an omnivorous food selection. Larger species of pufferfish are able to use their beak-like front teeth to break open clams, mussels, and other shellfish. Some species of pufferfish have also been known to enact various hunting techniques ranging from ambush to open-water hunting. The tetraodontids have been estimated to have diverged from diodontids between 89 and 138 million years ago. The four major clades diverged during

180-530: A delicacy. There was widespread consumption of northern puffers during the rationing that accompanied the Second World War , establishing a commercial fishery that reached its zenith in the 1960s. In much of the Northeast, the fish is known simply as "blowfish" or "chicken of the sea". They may also be sold as "sea squab". The northern puffer has the shape of a club. Adults have small spines covering

216-552: A few species such as the Mbu pufferfish can reach lengths greater than 50 cm (20 in). Tetraodontiformes , or pufferfish, are most significantly characterized by the beak-like four teeth – hence the name combining the Greek terms "tetra" for four and "odous" for tooth. Each of the top and bottom arches is fused together with a visible midsagittal demarcation, which are used to break apart and consume small crustaceans . The lack of ribs,

252-541: A lethal effect on large predators, such as sharks, but it can kill humans. Larval pufferfish are chemically defended by the presence of TTX on the surface of skin, which causes predators to spit them out. 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. Toxin level varies widely even in fish that are poisonous. A puffer's neurotoxin

288-418: A pelvis, and pelvic fins are also unique to pufferfish. The notably missing bone and fin features are due to the pufferfish' specialized defense mechanism, expanding by sucking in water through an oral cavity. Pufferfish can also have many varied structures of caltrop -like dermal spines, which account for the replacement of typical fish scales, and can range in coverage extent from the entire body, to leaving

324-418: A result, Florida banned the harvesting of puffers from certain bodies of water. Treatment is mainly supportive and consists of intestinal decontamination with gastric lavage and activated charcoal , and life-support until the toxin is metabolized. Case reports suggest anticholinesterases such as edrophonium may be effective. Northern puffer The northern puffer , Sphoeroides maculatus ,

360-436: 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 manner similar 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

396-494: A similar courting behavior, minus the crest/keel display. Eggs are laid, though, 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. In 2012, males of the species Torquigener albomaculosus were documented while carving large and complex geometric, circular structures in

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432-479: A warning not to eat puffer fish, after local fishermen died upon consuming puffer fish for dinner. The warning indicated that puffer fish toxin is 100 times more potent than cyanide . Pufferfish, called pakapao 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

468-540: Is a species in the family Tetraodontidae , or pufferfishes, found along the Atlantic coast of North America. Unlike many other pufferfish species, the flesh of the northern puffer is not poisonous, although its viscera can contain poison, and high concentrations of toxins have been observed in the skin of Floridian populations. They are commonly called sugar toads in the Chesapeake Bay region, where they are eaten as

504-503: Is likely an example of honestly signaled aposematism . Dolphins have been filmed expertly handling pufferfish amongst themselves in an apparent attempt to get intoxicated or enter a trance-like state. 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

540-579: Is near-universal in Formula 1 . It is also common in other racing series that ballast may only be located in certain positions on the car. In some racing series, for example the British Touring Car Championship , ballast is used as a handicap, the leading drivers at the end of one race being given more ballast for the next race. Ballast may also be carried aboard an aircraft. For example, in gliding it may be used to increase speed and/or adjust

576-527: 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 sharks . 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

612-423: 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, easy meal. Predators that do not heed this warning (or are "lucky" enough to catch

648-694: 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

684-449: The spinacanthids . The extinct genus, Archaeotetraodon is known from Miocene -aged fossils from Europe. 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

720-516: The aircraft's center of gravity, or in a balloon as a buoyancy compensator . Blowfish See text Tetraodontidae is a family of primarily marine and estuarine fish of the order Tetraodontiformes . The family includes many familiar species variously called pufferfish , puffers , balloonfish , blowfish , blowers , blowies , bubblefish , globefish , swellfish , toadfish , toadies , toadle , honey toads , sugar toads , and sea squab . They are morphologically similar to

756-698: The ballast contrary to orders, in the belief that the pumps would take care of it." In the nineteenth century, cargo boats returning from Europe to North America would carry quarried stone as ballast, contributing to the architectural heritage of some east coast cities (for example Montreal ), where this stone was used in building. During World War 2 ships returning from Great Britain to the United States used rubble as ballast. The ballast would be dumped in New York and used for construction projects such as FDR Drive and an outcrop colloquially named Bristol Basin since it

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792-522: The closely related porcupinefish , which have large external spines (unlike the thinner, hidden spines of the Tetraodontidae, which are only visible when the fish have puffed up). The majority of pufferfish species are toxic , with some among the most poisonous vertebrates in the world. In certain species, the internal organs, such as the liver, and sometimes the skin, contain tetrodotoxin , and are highly toxic to most animals when eaten; nevertheless,

828-424: 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 aquaria, and follow

864-411: The danger. Consumers are regularly hospitalized and some even die from the poisoning. 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 , US. The symptoms generally resolve within hours to days, although one affected individual required intubation for 72 hours. As

900-403: The entire body with a tiny beak-like mouth. It is characterized by vertical stripes with a gray to brown dorsal surface and a yellow to white belly. It has tiny jet-black pepper spots (about 1 mm in diameter) scattered over most of pigmented surface, particularly evident on cheeks. Lower sides of the body have a row of black, elongate, bar-like markings. A small dorsal fin is set far back near

936-957: The frontal surface empty. Tetraodontidae typically have smaller spines than the sister family Diodontidae , with some spines not being visible until inflation. They are most diverse in the tropics , relatively uncommon in the temperate zone , and completely absent from cold waters . Most pufferfish species live in marine or brackish waters, but some can enter fresh water. About 35 species spend their entire lifecycles in fresh water. These freshwater species are found in disjunct tropical regions of South America ( Colomesus asellus and Colomesus tocantinensis ), Africa (six Tetraodon species), and Southeast Asia ( Auriglobus , Carinotetraodon , Dichotomyctere , Leiodon and Pao ). The puffer's unique and distinctive natural defenses help compensate for its slow locomotion. It moves by combining pectoral , dorsal , anal , and caudal fin motions. This makes it highly maneuverable, but very slow, so

972-399: The lips. 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 the diaphragm muscle and stops the person who has ingested it from breathing. People who live longer than 24 hours typically survive, although possibly after

1008-507: The meat of some species is considered a delicacy in Japan (as 河豚, pronounced 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 nontoxic flesh, such as the northern puffer , Sphoeroides maculatus , of Chesapeake Bay , are considered a delicacy elsewhere. The species Torquigener albomaculosus

1044-549: The northwest Atlantic. It ranges from Florida (U.S.) to Newfoundland (Canada). The northern puffer feeds primarily on shellfish , and occasionally on finfish. Using its beak-like mouth it can extract shellfish from their shells and sometimes break the shells to obtain a meal . They will attack blue crabs, blowing water underneath to turn the crab over, then attack the underside before it can right itself. Northern puffers spawn from May through August in shallow water over sandy or muddy bottoms. The adhesive eggs are defended by

1080-429: 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 (TTX), 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

1116-449: The seabed sand in Amami Ōshima , Japan. The structures serve to attract females and to provide a safe place for them to lay their eggs. Information on breeding of specific species is very limited. T. nigroviridis , the green-spotted puffer, has recently been spawned artificially under captive conditions. It is believed to spawn in bays in a similar manner to saltwater species, as their sperm

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1152-469: The tail. Sphoeroides maculatus , like others in the puffer family, "puffs up" into a ball in self-defense by inhaling water into a special chamber near its stomach. They will puff up with air if taken out of the water. The northern puffer reaches up to 36 cm (1 ft 2 in) in length, but is usually around 20 cm (8 in). The northern puffer inhabits bays, estuaries and protected coastal waters at depths of 10–183 m (33–600 ft) in

1188-451: The vessel upright. Some or all of this ballast would then be discarded when cargo was loaded. Ballast weight is also added to a race car to alter its performance. In most racing series, cars have a minimum allowable weight. Often, the actual weight of the car is lower, so ballast is used to bring it up to the minimum. The advantage is that the ballast can be positioned to affect the car's handling by changing its load distribution . This

1224-523: Was described by David Attenborough as "the greatest artist of the animal kingdom" due to the males' unique habit of wooing females by creating nests in sand composed of complex geometric designs. The family name comes from the name of its type genus Tetraodon ; it is traced from the Greek words τετρα tetra meaning "four" and ὀδούς odoús meaning "teeth". The Tetraodontidae contains 193 to 206 species of puffers in 27 or 28 genera: Pufferfish are typically small to medium in size, although

1260-545: Was found to be motile only at full marine salinities, but wild breeding has never been observed. Xenopterus naritus has been reported to be the first bred artificially in Sarawak, Northwestern Borneo, in June 2016, and the main purpose was for development of aquaculture of the species. Pufferfish diets can vary depending on their environment. Traditionally, their diet consists mostly of algae and small invertebrates. They can survive on

1296-488: Was made from rubble from bombed-out Bristol . Ballast takes many forms, for example: Sailing ballast is used in sailboats to provide righting moment to resist the overturning moment generated by lateral forces on the sail . Insufficiently ballasted boats will tend to tip, or heel, excessively in high winds. Too much heel may result in the boat capsizing . If a sailing vessel should need to voyage without cargo then ballast of little or no value would be loaded to keep

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