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Neolamprologus similis
authority not recorded
Max length45mm SL1.8in SLTanknot recordedTemp24–27°C75–81°FpH7.5–9.0N. similis is one of the less frequently seen shelldwellers in the hobby but has no less personality than its cousins. The territories it establishes are very small, usually measuring no more than 6" across, but they are defended vigorously. The tiny fish will even bite hands or fingers that invade their 'personal space'! It can be distinguished from the similar N. multifasciatus by the presence of additional barring on the head and neck and also in this species the stripes appear...
Neolebias ansorgiiAnsorge's Neolebias
authority not recorded
Max length35mm SL1.4in SLTank45 × 30cm18 × 12inTemp24–28°C75–82°FpH5.0–6.0This species is rarely offered for sale and often appears to be a fairly plain fish when it is seen in dealer's tanks. However, when kept in the correct conditions it is a stunning little fish that comes highly recommended.
Neolebias trilineatusThree-lined Neolebias
authority not recorded
Max length35mm SL1.4in SLTank45 × 30cm18 × 12inTemp23–26°C73–79°FpH6.0–7.2This species is rarely seen in the trade but makes a superb addition to the smaller community tank. Often appears quite bland in dealer's tanks but, in the correct environment, is a stunning little fish....

Neosilurus brevidorsalisShortfin Tandan
Günther, 1867
Max length200mm SL8in SLTank120 × 45cm48 × 18inTemp20–28°C68–82°FpH6.0–7.5Type locality is ‘Nicol Bay, Cape York, Queensland, Australia’, and this species is restricted to the tips of northern Australia and southern Papua New Guinea. In Australia records exist only from the Jardine and Jackson river systems on the Cape York Peninsula, while in Papua New Guinea it’s known from the Fly River plus some other drainages.
Nimbochromis livingstonii
authority not recorded
Max length250mm SL10in SLTank120 × 45cm48 × 18inTemp24–28°C75–82°FpH7.6–8.8Not a fish for the general Malawi cichlid community, N. livingstonii is an ambush predator in nature, often being seen hanging motionless around rocky structures, in Vallisneria thickets or on the floor of the lake. It is a sedentary species and does not move around a lot. This is a behavioural adaptation known as thanatosis, or 'playing dead'. This strategy is usually used as for defensive means in other animals but in N. livingstonii is adapted for offensive means. The fish has a mot...
Nimbochromis venustusVenustus
authority not recorded
Max length250mm SL10in SLTank120 × 45cm48 × 18inTemp24–28°C75–82°FpH7.6–8.8Not a fish for the general Malawi cichlid community, N. venustus is an ambush predator in nature. It is often found hanging motionless around rocky structures, in Vallisneria thickets or on the floor of the lake. It is a sedentary species and does not move around a lot. This is a behavioural adaptation known as thanatosis, or 'playing dead'. This strategy is usually used as for defensive means in other animals but in N. venstus is adapted for offensive means. The fish has a mottled col...

Nothobranchius eggersi
Seegers, 1982
Max length50mm SL2.0in SLTank45 × 30cm18 × 12inTemp20–24°C68–75°FpH7.0–8.2Type locality is 'Rufiji River near Utete, eastern Tanzania', and this species is apparently endemic to the lower Rufiji including the Selous Game Reserve and freshwater parts of the Rufiji delta region. Populations in the aquarium hobby include 'Rufiji river camp', 'Kikongono', 'Ruhoi River', 'Kanga', 'Utete', 'Saadani Game Reserve', 'Ruvu River', 'Bagamoyo', 'Makurunge', 'Killimani', 'Chamakwese', 'Nyamwage', 'Mohoro', and 'Ukuni'.
Ophthalmotilapia boops
authority not recorded
Max length150mm SL6in SLTank120 × 38cm48 × 15inTemp23–27°C73–81°FpH7.5–9.0This was the first species to be placed into the genus Ophthalmotilapia.
Ophthalmotilapia ventralis
authority not recorded
Max length150mm SL6in SLTank135 × 45cm53 × 18inTemp23–27°C73–81°FpH7.5–9.0This is a truly stunning species that does well in a Tanganyikan community with well-chosen tankmates. It exists in well over 20 colour morphs, too many to list here. Obviously these should not be mixed in aquaria as they will hybridise freely. In nature, it is only the largest dominant males that build nests whilst the subdominant males and females shoal together. The territories of these dominant fish may measure several metres across....

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...

Opsarius ornatus
Sauvage, 1883
Max length110mm SL4in SLTank150 × 60cm60 × 24inTemp18–26°C64–79°FpH6.0–8.0Type locality is 'Mé-Nam River, Thailand', with 'Mé-Nam' having been considered an older name for the Chao Phraya river in central and western Thailand prior to this species' redescription by Tejavej (2012). In fact 'menam' is the Thai word for 'river' and thus could refer to any drainage, and B. ornatus is restricted to...

Opsarius pulchellus
Smith, 1931
Max length110mm SL4in SLTank120 × 45cm48 × 18inTemp18–26°C64–79°FpH6.0–7.5This species is traded for aquaria under various names including 'butterfly barb', 'mackerel barb', 'green-barred danio', and 'royal opsarius'. It can be told apart from other memb...

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...

Oreichthys sp. 'Myanmar Redfin'
authority not recorded
Max length40mm SL1.6in SLTank60 × 30cm24 × 12inTemp24–28°C75–82°FpH6.5–7.5This fish is one of several sometimes imported and sold as Oreichthys cosuatis or O. parvus which has led to considerable confusion. It appears to be an undescribed species and can be most easily identified by the absence of a dark marking in the dorsal-fin of adult males (vs. presence in O. cosuatis and O. parvus) and possession of a large, well-defined black blotch on the caudal peduncle ( vs. absent in O. cosuatis, smaller and less well-defined in O. parvus).

Oryzias eversi
Herder, Hadiaty & Nolte, 2012
Max length40mm SL1.6in SLTank75 × 30cm30 × 12inTemp18–24°C64–75°FpH6.0–7.5The type locality is a karst pool around 30-40 m in length, 10m in width and up to 4 m deep. It contains still, transparent water, has a single inflow and outflow, is surrounded by rainforest and in September 2010 the water temperature was 21.5°C/70.7°F. The habitat is used by locals as a bathing pool and sympatric species included a nat...

Oryzias javanicusJavanese Ricefish
Bleeker, 1854
Max length35mm SL1.4in SLTank45 × 30cm18 × 12inTemp24–29°C75–84°FpH7.0–9.0This species is widely-distributed throughout Peninsular Thailand, Malaysia (Malay Peninsula plus the states of Sabah and Sarawak, Borneo), Singapore and Indonesia, with records from the Riau Archipelago, Sumatra, Java, Borneo, Bali, Lombok, and Sulawesi existing in the latter. Type locality is 'Panimbang River, Perdana, Indonesia'. It's typically found in coastal, normally brac...

Oryzias wolasiWolasi Ricefish
Parenti, Hadiaty, Lumbantobing & Herder, 2013
Max length35mm SL1.4in SLTank45 × 30cm18 × 12inTemp23–27°C73–81°FpH7.0–8.0This species was discovered in 2009 and as far as we know it has only been collected for the aquarium hobby on a single occasion to date, by Jeffrey Christian of Maju Aquarium, Frank Evers and Hans-Georg Evers. Prior to description it was referred to as O. sp. 'Kendari', O. sp. 'neon' or O. sp. 'Sulawesi'.
Oryzias woworaeDaisy's Ricefish
Parenti & Hadiaty, 2010
Max length30mm SL1.2in SLTank45 × 30cm18 × 12inTemp23–27°C73–81°FpH6.0–7.5The type locality is a karstic freshwater stream flowing under 80% forest cover with a mixed substrate of mud and sand plus patches of leaf litter. O. woworae was collected from a still pool around 3-4 m deep, opposite an affluent spring, where it was schooling with a species of Nomorhamphus which may turn out to be a form of N. ebrardtii but has subsequently appeared in the aquarium trad...