Dichotomyctere ocellatus

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Dichotomyctere ocellatus
Figure8pufferfish.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Tetraodontiformes
Family: Tetraodontidae
Genus: Dichotomyctere
Species:
D. ocellatus
Binomial name
Dichotomyctere ocellatus
(Steindachner, 1870)
Synonyms

Tetraodon biocellatus Tirant, 1885 [2]

Dichotomyctere ocellatus (syn. Tetraodon biocellatus), commonly the figure 8 puffer or eyespot puffer, is a pufferfish found in freshwater [ clarification needed ] in Southeast Asia. It is known from the lower reaches of the Mekong (Cambodia), the Peninsular Malaysia as well as Borneo (Sarawak, Kalimantan). [1] [3]

Contents

Characteristics

Figure 8 puffers grow to about 8 cm (3.1 in) total length (TL). [3] They are colourful fish, with greenish yellow patterns on their backs. These patterns vary greatly from fish to fish, but the markings either side of the caudal fin resemble the number eight, or eye-spots (earning the species another common name as "eyespot puffer"). Figure 8 puffers are relatively peaceful among Tetraodontidae, and have been kept successfully with other fish such as bumblebee gobies and mollies, but as with all pufferfish there is a risk that tankmates will not be tolerated.[ citation needed ]

Like all members of its family, the figure 8 puffer is capable of inflating itself with water or air when stressed or otherwise frightened.[ citation needed ]

In freshwater

Like the closely related green pufferfish, the figure 8 exhibits euryhalinity, and undergoes epithelial remodeling and changes in the kidneys and gills when exposed to changes in salinity. Accordingly, the figure 8 puffer is often mistakenly regarded as an entirely freshwater fish, and has considerable resistance to freshwater exposure. In a marine environment, it exhibits typical saltwater fish morphological features in its gills, allowing it to secrete sodium chloride across the gill epithelium like a typical saltwater fish. However, acclimated to freshwater, the figure 8 puffer will exhibit specialized cells that do not match any gill ion-regulating cell of a freshwater fish. The other fish known to have these types of cells is the Mozambique tilapia (O. mossambicus). [4]

In the aquarium

Dichotomyctere ocellatus feeding on krill in an aquarium Tetraodonbiocellatus.jpg
Dichotomyctere ocellatus feeding on krill in an aquarium

In captivity, figure 8 puffers require a 15 US gallon tank with temperatures between 24 °C and 28 °C. They are sensitive to nitrites and nitrates and must be introduced into a fully cycled aquarium. Over-filtration is recommended as well as frequent partial water changes. Water pH will reflect the brackish environment to which these fish are best suited; the addition of marine salt will buffer the pH to a range between 7.8 and 8.3. With a salinity of between 1.005 and 1.008 specific gravity (S.G.), the lifespan of this species has been as long as 15 years. [5] As with all puffer fish, they require a complex aquarium set up consisting of many nooks and crannies. This helps figure 8 puffers to behave as they would in nature, and reduce boredom.[ citation needed ]

Diet

A figure 8 puffer with visibly overgrown teeth. Tbiolt.jpg
A figure 8 puffer with visibly overgrown teeth.

Pufferfish are classed as molluscivores and feed mainly on benthic organisms which may include mussels, cockles, oysters and krill, though some puffers will take other foods, such as flake, it is not recommended that their primary food is flake. Their teeth, a beak formed from two plates, are capable of crushing shells in order to feed on prey. In captivity many fishkeepers feed snails as a substitute for the aforementioned foods as snails help keep the beak trim; it would otherwise be susceptible to overgrowth.[ citation needed ]

Eyespot puffer at the Dallas Children's Aquarium Eyespot puffer at Dallas Children's Aquarium.jpg
Eyespot puffer at the Dallas Children's Aquarium

Related Research Articles

<span class="mw-page-title-main">Tetraodontidae</span> Family of pufferfish

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 the closely related porcupinefish, which have large external spines.

<i>Takifugu</i> Genus of fishes

Takifugu, also known by the Japanese name fugu, is a genus of pufferfish with 25 species, most of which are native to salt and brackish waters of the northwest Pacific, but a few species are found in freshwater in Asia or more widely in the Indo-Pacific region. Their diet consists mostly of algae, molluscs, invertebrates and sometimes crustaceans.

<span class="mw-page-title-main">Fishkeeping</span> Practice of containing fish

Fishkeeping is a popular hobby, practiced by aquarists, concerned with keeping fish in a home aquarium or garden pond. There is also a piscicultural fishkeeping industry, serving as a branch of agriculture.

<span class="mw-page-title-main">Mbu pufferfish</span> Species of fish

The Mbu pufferfish, also known as Mbuna pufferfish, giant pufferfish, or giant freshwater pufferfish, is a carnivorous freshwater pufferfish originating from the middle and lower sections of the Congo River in Africa, as well as the east coast of Lake Tanganyika near the Malagarasi River mouth.

<span class="mw-page-title-main">Narrow-lined puffer</span> Species of fish

The narrow-lined pufferfish is a demersal marine fish belonging to the family Tetraodontidae.

<span class="mw-page-title-main">Fahaka pufferfish</span> Species of fish

The fahaka pufferfish, also known as the Nile puffer, globe fish, lineatus puffer, is a tropical freshwater pufferfish found in the upper Nile, Chad, Senegal, Gambia, Geba, Volta and Turkana basins in West, Northeast and East Africa.

<span class="mw-page-title-main">Congo pufferfish</span> Species of fish

The Congo puffer or potato puffer is a freshwater pufferfish found in areas of the Congo River in Africa, including rapids.

<i>Dichotomyctere nigroviridis</i> Species of fish

Dichotomyctere nigroviridis or the green spotted puffer is a species of pufferfish. It is found across South and Southeast Asia in coastal freshwater, but survives the longest in brackish to saltwater, and brackish water habitats. D. nigroviridis reaches a typical maximum length of about 15 cm (6 in) (5.9 in), with reports of up to 17 cm (6.7 in). In February 2009, it was successfully bred in captivity at University of Florida using a new variation of the ovarian lavage technique.

<span class="mw-page-title-main">Dwarf pufferfish</span> Species of fish

The dwarf pufferfish, also known as the Malabar pufferfish, pygmy pufferfish, or pea pufferfish, is a small freshwater pufferfish endemic to Kerala and southern Karnataka in Southwest India. They are popular in aquaria for their bright colours and small size. At a maximum total length of 3.5 cm, dwarf pufferfish are one of the smallest pufferfish in the world. They closely resemble the related Carinotetraodon imitator, and the two can be difficult to distinguish. C. imitator was not recognised as a different species until 1999.

<span class="mw-page-title-main">Brackish-water aquarium</span>

A brackish-water aquarium is an aquarium where the water is brackish (semi-salty). The range of "saltiness" varies greatly, from near freshwater to near marine and is often referred to as specific gravity (SG) or salinity. Brackish water aquaria is a popular specialization within the fishkeeping hobby. Many species of fish traded as freshwater species are actually true brackish species, for example mollies, Florida flagfish, and some cichlids such as chromides and black-chin tilapia. There are also several popular species traded purely as brackish water fish, including monos, scats, archerfish, and various species of pufferfish, goby, flatfish, and gar. Generally, aquarists need to maintain a specific gravity of around 1.005 to 1.010 depending on the species being kept, but practically all brackish water fish tolerate variations in salinity well, and some aquarists maintain that regularly fluctuating the salinity in the aquarium actually keeps the fish healthy and free of parasites.

<i>Colomesus asellus</i> Species of fish

Colomesus asellus, the Amazon puffer, asellus puffer, South American freshwater puffer, Peruvian puffer, or Brazilian puffer is a species of pufferfish confined to the Amazon, Essequibo and Orinoco basins in tropical South America. It is a popular aquarium species.

<i>Carinotetraodon irrubesco</i> Species of fish

Carinotetraodon irrubesco, known commonly as the red-tail dwarf puffer, is a freshwater pufferfish found only in the lower Banyuasin basin in South Sumatra and the Sambas River in West Kalimantan.

Pao suvattii, or Arrowhead puffer, is a species of pufferfish. It is a medium-sized pufferfish, reaching 11.5 cm (4.5 in) SL. It is also known as a Pignose Puffer or a Mekong Puffer. It is locally common in the Lower Mekong basin, and is exclusively a freshwater fish.

<span class="mw-page-title-main">Green pufferfish</span> Species of fish

The green pufferfish or Ceylon pufferfish is a species of pufferfish found in South and Southeast Asia. Its habitat includes rivers, estuaries, lakes and flood plains. It lives in fresh to slightly brackish water.

<i>Dichotomyctere sabahensis</i> Species of fish

Dichotomyctere sabahensis is a species of pufferfish endemic to the southeast Asian island of Borneo. This species grows to a standard length of 10.8 cm (4.3 in).

<span class="mw-page-title-main">Violet goby</span> Species of fish

The violet goby is a species of goby native to marine, fresh and brackish waters near the Atlantic coast of North and South America from South Carolina in the United States of America, to northern Brazil. It prefers bays, estuaries and river mouths with muddy substrates. It is often marketed as the dragon goby or dragon fish.

<span class="mw-page-title-main">Zenarchopteridae</span> Family of fishes

Zenarchopteridae, the viviparous halfbeaks, is a family in the order Beloniformes. The Zenarchopteridae exhibit strong sexual dimorphism, practicing internal fertilisation, and in some cases ovoviviparous or viviparous. The members in the family are mainly found in fresh and brackish water of tropical Asia and New Guinea, but the genus Zenarchopterus also includes marine species from the Indo-Pacific. Several, such as the wrestling halfbeak, have become commonly traded aquarium fish.

<i>Dichotomyctere</i> Genus of fishes

Dichotomyctere is a genus of relatively small pufferfish found in both fresh and brackish waters in south and southeast Asia. Its species were generally included in the genus Tetraodon until 2013. The largest species of Dichotomyctere reach up to 17 cm (6.7 in) in length.

References

  1. 1 2 Daniels, A. (2020). "Dichotomyctere ocellatus". IUCN Red List of Threatened Species . 2020: e.T91347926A91348008. doi: 10.2305/IUCN.UK.2020-3.RLTS.T91347926A91348008.en . Retrieved 20 November 2021.
  2. Kottelat, M. (2013). The Fishes of the Inland Waters of Southeast Asia: A Catalogue and Core Bibliography of the Fishes Known to Occur in Freshwaters but lives sometime in brackish (aka mix of saltwater and freshwater) , Mangroves and Estuaries. The Raffles Bulletin of Zoology, 2013, Supplement No. 27: 1–663.
  3. 1 2 Froese, Rainer; Pauly, Daniel (eds.) (2017). "Dichotomyctere ocellatus" in FishBase . February 2017 version.
  4. Duffy, N. M.; Bui, P.; Bagherie-lachidan, M.; Kelly, S. P. (2011). "Epithelial remodeling and claudin mRNA abundance in the gill and kidney of puffer fish (Tetraodon biocellatus) acclimated to altered environmental ion levels". Journal of Comparative Physiology B. 181 (2): 219–38. doi:10.1007/s00360-010-0517-3. PMID   20976602. S2CID   11392135.
  5. The Puffer Forum, http://www.thepufferforum.com/forum/ug.php/v/PufferPedia/Brackish/T_Biocellatus/ Archived 27 September 2007 at the Wayback Machine (Retrieved 25 July 2007)

Bibliography

Ebert, K. (2001), The Puffers of Fresh and Brackish Water, p 19. Aqualog, ISBN   3-931702-60-X.