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Opsarius barna
Hamilton, 1822
Max length130mm SL5in SLTank150 × 60cm60 × 24inTemp16–24°C61–75°FpH6.0–8.0This species occasionally appears in the ornamental trade, usually as 'striped hill trout' or 'banded hill trout'. It can be distinguished from congeners by the following combination of characters: lateral line complete with 40-42 scales; barbels absent; 10-13 anal-fin rays; body with 9-11 dark blue vertical bars; last dorsal-fin ray extending to caudal-fin base.

Opsarius caudiocellatus
Chu, 1984
Max length86mm SL3.4in SLTank150 × 45cm60 × 18inTemp18–24°C64–75°FpH6.5–8.0This species may have appeared in the aquarium trade though probably not under the correct name. It can be told apart from similar-looking congeners by the following combination of characters: presence of a black round spot at the caudal base; dorsal-fin rays black with connecting membranes transparent; posterior dorsal-fin origin located midway between upper angle of gill aperture and caudal-fin base, or slightly closer to the latter.

Opsarius infrafasciatus
Fowler, 1934
Max length100mm SL3.9in SLTank120 × 45cm48 × 18inTemp18–26°C64–79°FpH6.0–8.0This species has previously been considered synonymous with both O. ornatus and O. pulchellus but is currently considered to be distinct following (Tejavej, 2012). It can be distinguished from congeners by a combination of characters including: small caudal spot presen...

Oreichthys cosuatis
Hamilton, 1822
Max length43mm SL1.7in SLTank60 × 30cm24 × 12inTemp24–28°C75–82°FpH6.5–7.5An assortment of undescribed Oreichthys spp. from India, Myanmar and Thailand are currently traded as O. cosuatis. It can be distinguished from other described members of the genus by lacking a black blotch on the caudal peduncle, plus the following combination of characters: 2-3 perforated scales in lateral line; ½6½ between pelvic-fin origin and dorsal midline; presence of dark stripe in centre of anal-fin, forming a triangular blotch in adult individuals; dorsal-fin with whitish tip and broad, black, subdistal margin in the upper portion of the fin; 11-13 rows...

Oreichthys crenuchoidesDrape Fin Barb
Schäfer, 2009
Max length45mm SL1.8in SLTank60 × 30cm24 × 12inTemp23–28°C73–82°FpH6.0–7.5This fish is sometimes traded as Oreichthys cosuatis, O. sp. 'high fin', O. 'umangii' (a nomen nudum that has only ever been applied to an image of a fish in the book 'Ornamental Aquarium Fish of India'; K. L.Tekriwal and A. A. Rao 1999), Puntius 'arunavii' or 'neon highfin barb'. It can be distinguished from congeners by the following combination of characters: absence of a dark marking in the anal-fin (vs. presence in other species); ½7½ scales scales between pelvic-fin origin and dorsal midline (vs. ½6½ in O. cosuatis and...
Orthochromis stormsi
authority not recorded
Max length120mm SL5in SLTank120 × 30cm48 × 12inTemp22–27°C72–81°FpH6.5–7.5O. stormsi was previously classified as Schwetzochromis stormsi and is still named as such by many sources. Its swimbladder is modified, being much reduced in size. This makes the fish less buoyant and therefore less likely to be swept away by the strong currents in its natural habitat. In the aquarium it spends most of its time on the substrate, where it swims in a characteristic 'hopping' fashion. Unfortunately, it is rather rare in the hobby....

Oryzias mekongensisMekong Ricefish
Uwa & Magtoon, 1986
Max length21mm SL0.8in SLTank40 × 20cm16 × 8inTemp23–27°C73–81°FpH6.0–7.5It can be further distinguished from congeners by the following combination of characters: small adult size; bright orange-red marginal bands on caudal-fin lobes in males; caudal-fin rounded and elongate; 5-7 dorsal-fin rays; relatively few (13-18) anal-fin rays without bony contact organs, the last ray branched; 6-8 pectoral-fin rays. Members of the family Adrianichthyidae are...
Osteochilus hasseltiiHard-lipped Barb
authority not recorded
Max length320mm SL13in SLTank180 × 60cm72 × 24inTemp22–25°C72–77°FpHnot recordedThere are currently 34 described species of Osteochilus although none can be considered popular in the aquarium hobby. According to Rainboth's 'Fishes of the Cambodian Mekong' members of the genus are characterised by lack of aspine, presence of 11-18rays, large rostral and maxillary barbels, papillae on both upper and lower lips, darkened but not black median fins and the fact that the lower lip is not separated from the isthmus by a deep post-labial groove. O. hasseltii can be f...

Osteochilus nashii
authority not recorded
Max length180mm SL7in SLTank120 × 45cm48 × 18inTemp22–25°C72–77°FpH6.5–7.5This species is very scarce in the trade indeed and you're most likely to see it on sale as a contaminant among import of other Indian species. There are currently 34 described species of Osteochilus although none can be considered popular in the aquarium hobby. According to Rainboth's 'Fishes of the Cambodian Mekong' members of the genus are characterised by lack of aspine, presence of 11-18rays, large rostral and maxillary barbels, papillae on both upper and lower lips,...
Otopharynx lithobatesSulphur-headed Hap
authority not recorded
Max length160mm SL6in SLTank90 × 45cm36 × 18inTemp24–28°C75–82°FpH7.6–8.8O. lithobates is a true rock dweller and is hardly ever seen in open water, even in aquaria. In fact, the scientific name lithobates literally translates as "rock dweller". Breeding males of this species rank among the most stunning of Lake Malawi Haplochromine cichlids. The three characteristic spots on the flanks disappear and are masked by a stunning neon blue patterning. Almost the entireand top of the head turn a deep yellow-orange colour. The most colourful variant is the "...

Pangio myersiGiant Kuhli Loach
Harry, 1949
Max length100mm SL3.9in SLTank60 × 30cm24 × 12inTemp21–26°C70–79°FpH3.5–7.0It's included in the P. kuhlii group of closely-related species and can be distinguished from other members by the following combination of characters: 8-11 very broad, quadrangular, regular dark body bars; orange base body colour; caudal-fin either entirely black or with a large black blotch at the base and a submarginal dark bar or row of spots. The latter feature can be useful in identifying young or newly-imported, undernourished specimens which can...

Parabotia lijiangensis
Chen, 1980
Max length83mm SL3.3in SLTank120 × 30cm48 × 12inTemp20–24°C68–75°FpH6.0–7.5It's told apart from congeners by a combination of characters as follows: large scales present on body and sides of head; caudal fin deeply forked with subequal lobes; 10-13 dark, vertical bars on the body; a dark, ocellated spot in the centre of the caudal-fin base; two bars on top of head, dorsal-fin with two rows of greyish spots; caudal-fin lobes with 3-4 dark bands on each; anal-fin with one indistinct band and another, more distinct, submarginal band; ventral fins with two indistinct bands.

Paracanthocobitis botiaZipper Loach
Hamilton, 1822
Max length152mm SL6in SLTank75 × 30cm30 × 12inTemp21–26°C70–79°FpH6.0–7.5Traded 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.

Paracanthocobitis zonalternans
Blyth, 1860
Max length78mm SL3.1in SLTank60 × 30cm24 × 12inTemp20–25°C68–77°FpH6.0–7.5According 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 pad on each side.

Parachanna africana
Steindachner, 1879
Max length300mm SL12in SLTank120 × 60cm48 × 24inTemp20–25°C68–77°FpH5.0–7.5Following Bonou and Teugels (1985), P. africana can be distinguished from congeners by the following combination of characters: colour pattern unique, comprising a series of 8-11 dark, chevron-shaped markings extending along the body posterior to the pectoral fins; 19-24 scales in the transverse series; lateral line complete with 73-83 pored scales; 45-48 dorsal-fin rays 45-48; 32-35 anal-fin rays.

Parasphaerichthys lineatus
Britz & Kottelat, 2002
Max length19mm SL0.7in SLTank40 × 20cm16 × 8inTemp22–27°C72–81°FpH6.5–8.0This species is sometimes traded under the names 'mini chocolate gourami', 'Burmese chocolate gourami' or mislabelled as the congener P. ocellatus, these two currently comprising the only known members of the genus. P. lineatus can be told apart from P. ocellatus via the following combination of characters: smaller body size (maximum standard length 18.7 mm vs. 32.0 mm); absence of ocellus-type marking in middle of each flank (vs. presence); presence of dark, stripe (vs. abs...
Pareutropius buffeiThree Striped African Glass Catfish
authority not recorded
Max length80mm SL3.1in SLTank75 × 30cm30 × 12inTemp24–28°C75–82°FpH6.0–7.5Formerly known as Eutropiellus buffei, this midwater swimming, diurnal catfish is very often sold as "Debauwi catfish". Pareutropius debauwi is a closely related species which is, in fact, seldom imported. Adults of the two species can be distinguished by several characteristics. In buffei there are three lateral stripes along the body, whilst debauwi possesses only one. Buffei also has black spots in the upper and lower parts of the caudal fin, and the fin itself has rounded lobes. Th...

Pethia aurea
Knight, 2013
Max length25mm SL1.0in SLTank45 × 30cm18 × 12inTemp18–24°C64–75°FpH6.0–7.0This species was considered to be a phenotype of the similar-looking P. gelius prior to its description. Following Knight (2013) it is included a group of closely-related species alongside P. gelius and P. canius, the trio being distinguished from other members of the genus Pethia by the following combination of characters: lateral line incomplete with 3-4 por...

Pethia phutunioDwarf Barb
Hamilton, 1822
Max length30mm SL1.2in SLTank60 × 30cm24 × 12inTemp21–26°C70–79°FpH6.0–7.0In P. phutonio the flank markings comprise two black, vertically-orientated blotches, one posterior to the operculum and the other on the caudal peduncle, and within the P. conchonius group this patterning is shared with P. bandula, P. cumingii, P. didi, P. meingangbii, P. padamya, and P. tiantian. It can be told apart from these by the following combination of characters: smaller adult size of 25 - 30 mm vs. at least 35 - 40 mm; minute maxillary barbels; incomplete lateral line with ab...

Pethia punctata
Day, 1865
Max length55mm SL2.2in SLTank75 × 30cm30 × 12inTemp21–26°C70–79°FpH6.0–7.5This species is poorly-known in the aquarium hobby and has a confusing taxonomic history having been considered both synonymous with or a subspecies of the congener P. ticto in the past. It can be distinguished from other members of the genus by the following combination of characters: lateral line complete with 27 scales (following Day); body with two dark blotches; anterior spot one scale row below lateral line; dorsal-fin with rows of spots.