Clown loach

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Clown loach
Chromobotia macracanthus.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Botiidae
Genus: Chromobotia
Kottelat, 2004
Species:
C. macracanthus
Binomial name
Chromobotia macracanthus
(Bleeker, 1852)
Synonyms
  • Cobitis macracanthusBleeker, 1852
  • Botia macracantha(Bleeker, 1852)

The clown loach (Chromobotia macracanthus), or tiger botia, [1] is a tropical freshwater fish belonging to the botiid loach family. It is the sole member of the genus Chromobotia. It originates in inland waters in Indonesia on the islands of Sumatra and Borneo. In Sentarum, West Borneo that fish named: ulanguli. It is a popular fish in the freshwater aquarium trade and is sold worldwide. [2]

Contents

Taxonomy and naming

The fish was first described as Cobitis macracanthus by Pieter Bleeker in 1852. In 1989, its scientific name was changed to Botia macracanthus. [3] In 2004, Dr. Maurice Kottelat divided the genus Botia , containing 47 different species, into seven separate genera, resulting in the clown loach being placed in a genus of its own, Chromobotia. [4] Its scientific name roughly translates to “Large-thorned colourful warrior”. [5]

The common name "clown loach" comes from the fish's bright colours and stripes (often tropical fish with stripes that stand out are commonly called "clown") as well as from its habit of 'entertaining' aquarium owners with strange habits, such as swimming upside down, or 'playing dead.'[ citation needed ]

Description and behavior

Illustration of a clown loach by Pieter Bleeker, displaying the erected thorn Chromobotia macracanthus Bleeker.jpg
Illustration of a clown loach by Pieter Bleeker, displaying the erected thorn

Information about the maximum size of the clown loach varies, with some estimates ranging up to 20–30 cm (7.9–11.8 in), and with typical adult sizes ranging from 15–20 cm (5.9–7.9 in). [6] The fish's body is long and laterally compressed, with an arched dorsal surface and a flat ventral surface. Its head is relatively large and its mouth faces downward with thick, fleshy lips, and four pairs of barbels. The barbels on the lower jaw are small and difficult to see. Clown loaches can make clicking sounds when they are happy, being territorial (used as a type of weapon/warning) or mating. This sound is produced by the grinding of their pharyngeal teeth.

The body is whitish-orange to reddish-orange, with three thick, black, triangular, vertical bands. The anterior band runs from the top of the head and through the eye, the medial band lies between the head and the dorsal fin, and wraps around to the ventral surface, and the posterior band covers almost all of the caudal peduncle and extends to the anal fin. There is some regional colour variation within the species; the pelvic fins on fish from Borneo are reddish-orange and black, while the pelvic fins on fish from Sumatra are entirely reddish-orange. [7]

The fish is sexually dimorphic, with females being slightly plumper than males. In addition, the tips of the tail on the male curve inwards slightly, whereas the females have straight tips. [3]

The fish has a movable spine that lies in a groove below the eye, which may be extended as a defence mechanism. The spine may cause a painful wound, but is not venomous. It also may be used as a predation tool as it is set close to the mouth.[ citation needed ]

Distribution and habitat

Clown loaches are native to the islands of Sumatra and Borneo in Indonesia. Clear stream environments provide the optimal habitat for clown loaches, but biannual monsoon flooding forces the fish to move into flooded flood plains, or murky or blackwater rivers or lakes, for 7–8 months of the year, and clown loaches are commonly found in the flood plains of hilly areas. [1] Breeding adults migrate to smaller waterways to spawn annually. [6]

In its native habitat, the fish is found in water with a temperature range of 25 to 30 °C (77 to 86 °F), a pH between 5.0 and 8.0, and water hardness between 5 and 12 dH. [2]

Reproduction in captivity

Clown loach reproduce in captivity only after hormonal stimulation of final oocyte maturation and ovulation. Captive breeding and mass production of clown loach is done primarily in country of origin (Indonesia) and in Europe.[ citation needed ]

In the aquarium

A clown loach in a planted tropical freshwater aquarium. 2015-09-13-223-Tiger-loach.jpg
A clown loach in a planted tropical freshwater aquarium.
Recommended conditions in the Aquarium [ citation needed ]
Tank450 litres (120 gallons)
Water Temperature 24–28 °C
Temperament Social, at least groups of 6
Water hardness 4–12°n
pH 6,0–7,2

A common and popular fish for tropical freshwater aquaria, C. macracanthus is a visually pleasing species. Although specimens in the wild will reach 40 to 50  cm, in the aquaria it is uncommon for C. macracanthus to attain more than 15 to 20 cm fork length. They are a very long-lived species, living up to 30 years[ dubious ]. [8]

These fish have bifurcated spines under the eyes. They are thought to be used as a defence mechanism and possibly, for obtaining prey.

C. macracanthus will associate with other benthic species in the aquaria if kept singly or with few other specimens. They make suitable tank-mates for any non-aggressive community fishes, but do not thrive when kept with larger, more dominant species.

Occasionally C. macracanthus will exhibit erratic swimming patterns, such as swimming on their sides or upside down. This is not usually a sign of illness, however, and the fish will normally return to normal behaviour almost instantly.

As C. macracanthus is found in riverine environments it is able to cope with good flow rates of water in the aquaria. Aquascapes may replicate this environment to suit the requirements of the species with areas of high flow, but also typically include areas of low flow to allow the fish to rest. C. macracanthus is also fond of cover and is not overly accustomed to bright lighting. The fish will often seek areas of shade or cover in which to rest during the day and become more active when light levels are more subdued. The barbels of clown loaches are known to be easily damaged by rough substrates, such as gravel, in aquaria.

Two juvenile clown loaches with ich. Characteristically, for this stage of infestation, both are hiding in an ornament. ClownLoachesWithIch2.JPG
Two juvenile clown loaches with ich. Characteristically, for this stage of infestation, both are hiding in an ornament.

Clown loaches are particularly susceptible to Ichthyophthirius (ich), or white spot disease. Due to the fact that clown loaches have small or no scales, they are often not treated with full doses of medications.

Over-exploitation of C. macracanthus has motivated the development of conservation efforts, mostly new artificial propagation techniques. [9] C. macracanthus is easier to breed when individuals are between two and four centimeters in size. [10]

Most clown loaches accept commercial flake food and sinking pellets as their dietary staple, but thrive with a variety of food: live (worms, brine shrimp, small snails), banana, other plant matter, freeze-dried (tubifex worms, especially if it is fortified) and frozen brine shrimp. Clown loaches (and their cousins) are also one of the few fishes that will eat bladder snails ( Physella acuta ), and are valued by aquarists for controlling this pest in planted aquaria.

See also

Related Research Articles

<span class="mw-page-title-main">Cypriniformes</span> Order of fishes

Cypriniformes is an order of ray-finned fish, which includes many families and genera of cyprinid fish, such as barbs, gobies, loaches, botias, and minnows. Cypriniformes is an “order-within-an-order”, placed under the superorder Ostariophysi—which is also made up of cyprinid, ostariophysin fishes. The order contains 11-12 families, over 400 genera, and more than 4,250 named species; new species are regularly described, and new genera are recognized frequently. Cyprinids are most diverse in South and Southeast Asia, but are entirely absent from Australia and South America. At 112 years old, the longest-lived cypriniform fish documented is the bigmouth buffalo.

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

Cobitidae, also known as the True loaches, is a family of Old World freshwater fish. They occur throughout Eurasia and in Morocco, and inhabit riverine ecosystems. Today, most "loaches" are placed in other families. The family includes about 260 described species. New species are being described regularly.

<i>Pangio</i> Genus of fishes

Pangio is a genus of small Asian freshwater fish in the true loach family Cobitidae. In earlier taxonomic schemes it was known as Acanthophthalmus. The "kuhli loach" is well-known in the aquarium trade and commonly identified as P. kuhlii, but most individuals actually appear to be P. semicincta.

<i>Botia</i> Genus of fishes

Botia is a genus of freshwater fish in the loach family (Botiidae). It was a large genus with about 20 species. In 2004 Maurice Kottelat proposed in his paper to divide the genus into four related genera based on fish appearance and locality:

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

The dwarf loach, ladderback loach, pygmy loach, chain loach or chain botia is a freshwater fish belonging to the family Botiidae. Formerly included in the genus Yasuhikotakia, it is frequently seen in the aquarium trade, the product of captive breeding.

<span class="mw-page-title-main">Burmese border loach</span> Species of fish

The Burmese Border loach, angelicus loach or polka dot loach, Botia kubotai, is a recently described species that has quickly become a popular tropical fish for freshwater aquariums. In 2002, fish collectors working in western Thailand began to expand their search into Myanmar (Burma) area from the Three Pagodas Pass Thai-Myanmar border to look for new fish for the aquarium trade. This is one of several species discovered and explains the origin of the fish's common name: Burmese Border Loach. Its specific epithet honors Katsuma Kubota of an aquarium export company in Thailand who first purchased the catch and sent them out for identification.

<span class="mw-page-title-main">Zebra loach</span> Species of fish

The zebra loach is a freshwater loach native to rivers and streams in the Western Ghats of India. The maximum size is about 9 cm (3.5 in). It lives in tropical climate with temperature range of 21–26 °C (70–79 °F), and prefers water with 6.0 to 7.5 pH.

<span class="mw-page-title-main">Spined loach</span> Species of fish

The spined loach is a common freshwater fish in Europe. It is sometimes known as spotted weather loach, not to be confused with the "typical" weather loaches of the genus Misgurnus. This is the type species of the spiny loach genus (Cobitis) and the true loach family (Cobitidae).

<span class="mw-page-title-main">Pond loach</span> Species of freshwater fish

The pond loach, also known as the Dojo loach, oriental weatherloach or oriental weatherfish, is a freshwater fish in the loach family Cobitidae. They are native to East Asia, but are also popular as an aquarium fish and introduced elsewhere in Asia and to Europe, America and Australia. The alternate name weather loach is shared with several other Cobitidae, including the other members of the genus Misgurnus and the spotted weather loach. This term comes from their ability to detect changes in barometric pressure before a storm and react with frantic swimming or standing on end.

<i>Yasuhikotakia</i> Genus of fishes

Yasuhikotakia is a genus of botiid loaches, many which are popular aquarium fish. It is named in honor of Japanese collector/researcher Dr. Yasuhiko Taki. This genus has been separated from the genus Botia in the paper by Maurice Kottelat in 2004.

Pangio anguillaris is a species of loach found in still and slow-moving freshwater in Indochina, Malay Peninsula, Sumatra, and Borneo.

<i>Yasuhikotakia modesta</i> Species of fish

Yasuhikotakia modesta is a tropical freshwater fish of the family Botiidae. It is native to large rivers in Thailand, Laos, Cambodia, and Vietnam. The blue botia is a widely available fish in the aquarium trade and can be purchased globally.

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

Botiidae is a family of cypriniform ray-finned fishes from South, Southeast, and East Asia. Until recently they were placed in the true loach family Cobitidae, until Maurice Kottelat revised the loaches and re-elevated this taxon to family rank in 2012. The family includes about 56 species.

<span class="mw-page-title-main">Java loach</span> Species of fish

The Java loach is a species of tropical freshwater fish, an unbanded kuhli loach, native to the sandy streams of Southeast Asia. Its alternative common names include the black kuhli loach, chocolate kuhli loach and cinnamon loach. It is common in the aquarium trade.

<i>Gyrinocheilus aymonieri</i> Species of fish

Gyrinocheilus aymonieri is a freshwater fish native to large parts of Southeast Asia. It is of interest as a local food source and for the aquarium trade. Its common names include honey sucker, sucking loach and Chinese algae eater.

The true Kuhli loach, occasionally referred to as eel loach, is a small eel-like freshwater fish belonging to the loach family (Cobitidae). They originate from the island of Java in Indonesia. This snake-like creature is very slender and nocturnal.

<span class="mw-page-title-main">Loach</span> Superfamily of fish

Loaches are fish of the superfamily Cobitoidea. They are freshwater, benthic (bottom-dwelling) fish found in rivers and creeks throughout Eurasia and northern Africa. Loaches are among the most diverse groups of fish; the 1249 known species of Cobitoidea comprise about 107 genera divided among 9 families.

<i>Syncrossus hymenophysa</i> Species of fish

Syncrossus hymenophysa, commonly known as the tiger loach, tiger botia or green tiger loach, is a species of freshwater fish in the loach family Botiidae. It is native to fast mountain streams and large rivers, over soft substrates and often near submerged boulders and fallen trees, in Peninsular Malaysia, Borneo and Sumatra. Unlike most loaches, S. hymenophysa is very aggressive, especially when food is added to the tank.

<i>Syncrossus helodes</i> Species of fish

Syncrossus helodes, commonly known as banded loach, tiger botia or lesser katy loach, is a freshwater fish in the loach family Botiidae. It is native to rivers in Vietnam, Thailand, Laos and Cambodia. S. helodes resembles S. hymenophysa from Borneo, Sumatra and Peninsular Malaysia, and the two have frequently been confused. It differs from the latter species by the absence of a dark spot on the dorsal fin, 10–12 bars on body without blue borders and the presence of irregular dark markings on the lower body.

<i>Lepidocephalichthys hasselti</i> Species of fish

Lepidocephalichthys hasselti is a species of cobitid loach native to southeastern Asia and western Indonesia. This species reaches a length of 45 millimetres (1.8 in) TL.

References

  1. 1 2 "Clown loach profile". Badman's Tropical Fish. Retrieved 2007-08-18.
  2. 1 2 Froese, Rainer; Pauly, Daniel (eds.) (2016). "Chromobotia macracanthus" in FishBase . January 2016 version.
  3. 1 2 "Clown Loach". WetPetz.com. 2004. Retrieved 2007-08-17.
  4. Kottelat, Maurice (2004). "Botia kubotai, a new species of loach (Teleostei: Cobitidae) from the Ataran River basin (Myanmar), with comments on botiine nomenclature and diagnosis of a new genus" (PDF - abstract only). Zootaxa. 401: 1–18. doi:10.11646/zootaxa.401.1.1. ISSN   1175-5334 . Retrieved 2007-08-17.
  5. "etymology". seriouslyfish. 2 December 1852. Retrieved 15 February 2022.
  6. 1 2 Åhlander, Ola (2 September 2004). "Clown loach Chromobotia macracanthus (Bleeker 1852)". www.bollmoraakvarieklubb.org. Archived from the original on 2015-05-20. Retrieved 2007-08-18.
  7. Thoene, Martin (13 August 2007). "Clown Loach Coloration & Marking Variations". Loaches online. Retrieved 2007-08-18.
  8. "age". fisharoma. Retrieved 20 January 2022.
  9. Legendre, Marc; Satyani, Darti; Subandiyah, Siti; Sudarto; Pouyaud, Laurent; Baras, Etienne; Slembrouck, Jacques (April 2012). "Biology and culture of the clown loach Chromobotia macracanthus (Cypriniformes, Cobitidae) : 1- Hormonal induced breeding, unusual latency response and egg production in two populations from Sumatra and Borneo Islands". Aquatic Living Resources. 25 (2): 95–108. doi: 10.1051/alr/2012008 . ISSN   0990-7440.
  10. "Close to Extinction: Clown Loach | The Last Fish". blogs.ntu.edu.sg. Retrieved 2018-10-07.