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Acanthocobitis botia (HAMILTON, 1822)

Zipper Loach

SynonymsTop ↑

Cobitis botia Hamilton, 1822; Nemacheilus botia (Hamilton, 1822); Noemacheilus botia (Hamilton, 1822); Cobitis turio Hamilton, 1822; Cobitis bilturio Hamilton, 1822; Cobitis bimucronata McClelland, 1839: Cobitis ocellata McClelland, 1839; Cobitis gibbosa McClelland, 1839; Cobitis monocera McClelland, 1839; Cobites argentata Swainson, 1839; Cobitis arenata Valenciennes, in Jacquemont, 1839; Canthophrys unispina Swainson, 1839; Nemachilus mackenziei Chaudhuri, 1910

Etymology

Acanthocobitis: from the Greek acantho-, meaning ‘thorny’, and kobitis, meaning ‘a kind of sardine’.

Classification

Order: Cypriniformes Family: Nemacheilidae

Distribution

Described from ‘northeastern Bengal’ and formerly considered to have an enormous range extending eastwards from the Indus River basin in Pakistan through northern India, Nepal, Bhutan, Bangladesh, Myanmar, the Chinese province of Yunnan, and into western Thailand, and covering several major river drainages including the Ganges, Irrawaddy,  Salween, and Mae Klong.

Kottelat (2012) considers the former synonyms A. mooreh (Sykes, 1839) from Peninsular India, A. urophthalmus (Günther, 1868) from Sri Lanka, and A. mandalayensis (Rendahl, 1948) from Myanmar to be valid species, while noting that specimens from the Mae Klong drainage previously identified as A. botia are in fact A. pictilis, and that specimens from the Indus, Ganges and Brahmaputra may not all be conspecific.

A. botia sense stricto may thus be restricted to northern India but for the time being its range is unclear.

Habitat

Habitats vary to some extent and most are  seasonal in nature, e.g., swelling in volume and flowing more rapidly during the annual monsoons.

However in general it shows a preference for stretches of streams and small rivers where leaf litter and other debris collects, areas of open sand or mixed cobbles, rocks, and boulders.

Maximum Standard Length

Normally 80 – 100 mm. Reports of it reaching 152 mm probably refer to misidentified specimens of A. pavonacea.

Aquarium SizeTop ↑

Base dimensions in excess of 75 ∗ 30 cm are sufficient.

Maintenance

Will do well in most larger, well-maintained tanks if plenty of hiding places are provided, and should not harm softer-leaved plants.

However we recommend keeping it in a set-up designed to resemble a slow-moving or marginal section of stream or river with a sandy substrate and perhaps a few water-worn boulders.

This can be decorated with driftwood roots and branches arranged to form some shaded spots, plus a few handfuls of dried beech, oak or Terminalia (Indian Almond) leaves. Aquatic plants such as Microsorum, Bolbitis or Anubias spp. can be grown attached to the décor and bright lighting will promote the growth of aufwuchs which will add to the natural feel.

In this kind of environment the fish will show more natural behaviour and can be maintained alongside other species that enjoy similar conditions (see ‘compatibility’).

Although a high level of water movement isn’t essential it’s also proven to thrive in a mature hill stream-type set-up with a rocky aquascape.

Water Conditions

Temperature: 21 – 26 °C

pH: 6.0 – 7.5

Hardness: 90 – 215 ppm

Diet

Chiefly a micropredator feeding on insect larvae and suchlike in nature.

In the aquarium it will accept sinking dried foods but should also be offered regular meals of small live and frozen fare such as Daphnia, Artemia, bloodworm, etc. A varied diet is the key to maintaining it in the best of health.

Behaviour and CompatibilityTop ↑

Generally peaceful and can be maintained alongside many of the more popular species in the hobby although ideally fishes from from one of its native countries or rivers should be selected.

Most small, peaceful schooling or shoaling cyprinids are excellent choices as are many other loaches such as Lepidocephalichthys and some Nemacheilus spp.

In a hill stream-style set-up it can also be housed with rheophilic loaches such as Gastromyzon, Pseudogastromyzon, Beaufortia and Sewellia spp., but more aggressive nemacheilids, e.g., similarly-sized Schistura spp. are best avoided.

It exists in loose aggregations in nature and can exhibit shy or skittish behaviour if kept singly or in small numbers so buy a group of six or more. You´ll be rewarded with a more natural-looking display plus interesting behaviour from the fish as they interact with conspecifics.

Some specimens have been known to nip the fins of rivals.

Sexual Dimorphism

Adult males are slimmer and have a suborbital slit, visible as a cleft in the skin, extending from below the eye which is absent in females.

Reproduction

As far as we know it’s not bred commercially and all fish available in the trade are probably collected from wild stocks.

There do exist a few reports of fry being found in mature, well-decorated aquaria although the numbers recovered were very small and it seems likely this species eats its eggs given the opportunity.

UK aquarist Mick Wright has had success with the related A. zonalternans so perhaps an upscaled version of his approach would be a good starting point; see the relevant section of that species profile for more information.

NotesTop ↑

A. botia is traded under various names including ‘mottled‘, ‘eyepot’, ‘sand‘ and ‘striped‘ loach. It’s perhaps one of the better choices for those new to keeping nemacheilids being relatively hardy, peaceful and exhibiting some quirky behavioural traits.

The characteristic ocellus, a dark marking at the top of the caudal peduncle that resembles an eye, is thought to have some function in predator distraction and is normally more intense in younger specimens.

A. botia can be told apart from congeners by colour pattern comprising dark, saddle-shaped markings forming an irregular pattern along the dorsal surface and upper body, a series of roundish to triangular, non-elongated markings along the lateral line, these often connected to each other, and which may or may not be connected to the saddles.

In other species the saddles and lateral markings tend to be arranged more regularly. Male individuals of  A. botiaA. mandalaysensis, and A. pictilis also possess a suborbital slit rather than suborbital flap which immediately distinguishes them from all other members of the genus.

According to Kottelat (1990) the chief distinguishing characters for the genus are: possession of 9-18½ branched dorsal-fin rays; colour pattern without black basal caudal bar, but with an ocellus at upper base of caudal-fin; upper lip with or without several rows of papillae; lower lip with a broad median interruption and a widened, papillated padon each side.

Grant (2007) considered Acanthocobitis longipinnis, the type species of Acanthocobitis, to be a junior synonym of A. pavonacea and erected the subgenus Paracanthocobitis to include all other species since he regarded A. pavonacea to be taxonomically unique

Kottelat (2012a) remarked that the identity of A. longipinnis requires verification and later (Kottelat, 2012b) classed Paracanthocobitis as a questionable synonym of Acanthocobitis.

The family Nemacheilidae is widely-distributed across most of Eurasia with the Indian subcontinent, Southeast Asia and China representing particular centres of species diversity.

References

  1. Grant, S., 2008 - BSSW-Report 20(3): 49-52
    Schmerlen der Gattung Acanthocobitis Peters, 1861.
  2. Grant, S., 2007 - Ichthyofile No. 2: 1-9
    A new subgenus of Acanthocobitis Peters, 1861 (Teleostei: Nemacheilidae).
  3. Kottelat, M., 2012b - Raffles Bulletin of Zoology Supplement 26: 1-199
    Conspectus cobitidum: an inventory of the loaches of the world (Teleostei: Cypriniformes: Cobitoidei).
  4. Kottelat, M., 2012a - Zootaxa 3327: 45-52
    Acanthocobitis pictilis, a new species of loach from Myanmar and Thailand (Teleostei: Nemacheilidae).
  5. Kottelat, M., 1990 - Verlag Dr. Friedrich Pfeil, München, Germany: 1-262
    Indochinese nemacheilines. A revision of nemacheiline loaches (Pisces: Cypriniformes) of Thailand, Burma, Laos, Cambodia and southern Viet Nam.
  6. Tang, Q., H. Liu, R. Mayden and B. Xiong, 2006 - Molecular Phylogenetics and Evolution 39(2): 347-357
    Comparison of evolutionary rates in the mitochondrial DNA cytochrome b gene and control region and their implications for phylogeny of the Cobitoidea (Teleostei: Cypriniformes).
  7. Vishwanath, W. and J. Laisram, 2001 - Journal of the Bombay Natural History Society 98(2): 197-216
    Fishes of the subfamily Nemacheilinae Regan (Cypriniformes: Balitoridae) from Manipur.
  8. Šlechtová, V., J. Bohlen and H. H. Tan, 2007 - Molecular Phylogenetics and Evolution 44(3): 1358-1365
    Families of Cobitoidea (Teleostei; Cypriniformes) as revealed from nuclear genetic data and the position of the mysterious genera Barbucca, Psilorhynchus, Serpenticobitis and Vaillantella.

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