Lepidocephalichthys goalparensis
SynonymsTop ↑
Lepidocephalus caudofurcatus Tilak & Husain, 1979
Classification
Order: Cypriniformes Family: Cobitidae
Distribution
Known from the Brahmaputra and Ganges river drainages in Nepal, northern India and Bangladesh plus parts of the upper Irrawaddy (aka Ayeyarwaddy) basin in Myanmar.
Type locality is given as ‘under a culvert, about 6 kilometers west of Dudhnai, Inspection Bunglow, Goalpara District, Assam State, India’.
Habitat
Most commonly found in shallow, slow-moving sections of streams or calm habitats such as swamps, oxbows, backwaters and paddy fields.
These are often heavily-vegetated or littered with submerged roots, branches and leaf litter, with substrates composed of soft mud or silt.
Water clarity and depth vary on a seasonal basis across much of its range, and at certain times of year it probably enters temporarily-flooded zones. Conversely during dry periods some habitats may become stagnant with blooms of macrophytic algae and resultant hypoxia (oxygen depletion).
Under such conditions members of this genus are able to use the intestine as a supplementary breathing organ and have been observed darting to the surface to gulp atmospheric air, and some have even been recorded to survive dry periods in moist sand or mud.
Maximum Standard Length
40 – 45 mm.
Aquarium SizeTop ↑
Base dimensions of 30 or more.
Maintenance
Not difficult to keep but must be provided with a soft, sandy substrate since some of its time will be spent completely buried, or with only eyes protruding. When coarser gravel is used it may become stressed or damage itself trying to dig, and feeding behaviour can be inhibited.
Other décor can include water-worn rocks and driftwood branches and tree roots arranged to form plenty of hiding places and shaded spots – add these prior to the substrate to prevent them being toppled by digging activity.
Lighting can be quite dim unless you intend to grow plants and a few handfuls of leaf litter would complement the natural effect.
As this species hails from sluggish waters high flow rates are best avoided although a degree of oxygenation is recommended.
Ensure that small specimens are unable to enter filter intakes and cover the tank well as most loaches do jump at times, especially when first introduced.
Water Conditions
Temperature: 73 – 79°F/22.8 – 26.1°C
pH: 6.0 – 7.5
Hardness: 2 – 15°H
Diet
Chiefly a micropredator typically sifting mouthfuls of substrate through the gills from which insect larvae, small crustaceans and suchlike are extracted.
In the aquarium it should accept sinking dried foods but also offer regular meals of small live and frozen fare such as Daphnia, Artemia, bloodworm, etc.
Behaviour and CompatibilityTop ↑
Lepidocephalichthys spp. are peaceful both with one another and other fishes and there exist no reports of them harming tankmates though they may prey on eggs or fry.
They fare best in the presence of conspecifics and should ideally be kept in a group of 4 or more specimens.
L. goalparensis should do well alongside fishes from similar environments that occupy the upper part of the water column such as Trichopodus, Trichogaster, Trichopsis or certain Danio species.
The presence of these should also make it less timid as the absence of fishes in the upper water column is often used as a signifier for approaching danger in nature.
Sand-dwelling loaches from the families Botiidae, Cobitidae and Nemacheilidae are also suitable but proper research is essential as some can be excessively territorial or otherwise aggressive.
A community based around fishes from its natural waters could include species such as Badis badis, Acanthocobitis zonalternans, Lepidocephalichthys guntea, Danio rerio, Trichogaster chuna and Trichogaster lalius.
Sexual Dimorphism
In mature males the pectoral fins are enlarged with fused, thickened innermost (7th and 8th) rays forming a structure known as the lamina circularis.
This generally varies in form depending on species and is present in some other cobitid genera though formed by different rays.
Adult females are typically heavier-bodied and a little larger then males.
Reproduction
Presumably a seasonal spawner in nature but hasn’t been bred in captivity.
NotesTop ↑
This species is almost unheard of in the hobby with the specimen pictured here the only one we’re aware of.
It was imported into the United Kingdom in late 2011 as bycatch among a shipment of mastacembelid eels from northern India, and the identification was subsequently confirmed by Justin Havird, senior author of the most recent revision of the genus.
It can be distinguished from congeners by the following combination of characters: forked caudal fin; normally four to five dark, broad, regularly spaced V-shaped bars in the caudal-fin; dorsal-fin origin usually anterior to pelvic-fin origin; moderate to large adult size (officially to 44 mm SL); lamina circularis comrising fused seventh and eighth pectoral rays, sometimes forming small dorsally-orientated flange (but never a large, serrated flange).
The family Cobitidae, often referred to as ‘true’ loaches, is widely-distributed across most of Eurasia with the Indian subcontinent, Southeast Asia and China representing particular centres of species diversity.
Phylogenetic analyses by Tang et al. (2006), Šlechtová et al. (2007) and Šlechtová et al. (2008) revealed that the group constitutes a separate genetic lineage to the family Botiidae (the two were previously grouped together under Cobitidae as subfamilies Cobitinae and Botiinae).
In the most recent study Lepidocephalichthys was not found to be as closely-related to Pangio, Lepidocephalus or Kottelatlimia as previously hypothesised though unfortunately the authors stop short of proposing an alternative theory.
All cobitids possess sharp, motile, sub-ocular spines which are normally concealed within a pouch of skin but erected when an individual is stressed, e.g. if removed from the water. Care is therefore necessary as these can become entangled in aquarium nets and with larger species even break human skin.
Thanks to Steve Grant.
References
- Arunkumar, L., 2000 - Journal of Fish Biology 57(5): 1093-1104
Loaches of the genus Lepidocephalicthys (Lepidocephalichthys) from Manipur, with description of a new species. - Havird, J. C. and L. M. Page, 2010 - Copeia 2010(1): 137-159
A revision of Lepidocephalichthys (Teleostei: Cobitidae) with descriptions of two new species from Thailand, Laos, Vietnam, and Myanmar. - Kottelat, M., 2012 - Raffles Bulletin of Zoology Supplement 26: 1-199
Conspectus cobitidum: an inventory of the loaches of the world (Teleostei: Cypriniformes: Cobitoidei). - Moitra, A., O. N. Singh and J. S. D. Munshi, 1989 - Japanese Journal of Icthyology 36(2): 227-231
Microanatomy and cytochemistry of the gastro-respiratory tract of an air-breathing cobitidid fish, Lepidocephalichthys guntea. - 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). - Šlechtová, V., J. Bohlen and A. Perdices, 2008 - Molecular Phylogenetics and Evolution 47(2): 812-831
Molecular phylogeny of the freshwater fish family Cobitidae (Cypriniformes: Teleostei): delimitation of genera, mitochondrial introgression and evolution of sexual dimorphism. - 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.
