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Brevibora dorsiocellata

Brevibora dorsiocellata
Eye Spot Rasbora
Brevibora dorsiocellata is a small fish belonging to the Family Cyprinidae, subfamily Danioninae, which is known by the common names of ocellated rasbora, hi-spot rasbora, and eye-spot rasbora, an allusion to the marking situated upon the dorsal fin. 
Brevibora dorsiocellata is a native of Malaysia and Sumatra . It is an inhabitant of streams and other waterbodies with an acidic pH, at least some of these being situated in habitats classified as peat swamp forests
Brevibora dorsiocellata is an elongate fish, with a pointed snout, whose base colour is a reflective, metallic silver, though under some lighting conditions, the fish can take on a yellowish hue, with a slight pink flush present in the ventral area of the body between the operculum and the pelvic fins (corresponding roughly to the sac enclosing the alimentary canal). Under conditions of reflectied light, the fish sometimes displays a fine lateral band from the opeculum to the end of the caudal peduncle this being an olive-gold hue. The fins, with the exception of the dorsal fin, are hyaline, the relation of the pectoral and pelvic fins being typical of the ostariophysans (fishes possessing an auxiliary mechanism for detecting sound consisting of a set of internal bones called the Weberian Ossicles). In such fishes, the pectoral fins are located immediately behind the operculum, whilst the pelvic fins are located further back upon the ventral side of the body - in the case of Brevibora dorsiocellata, their position is to be found vertically beneath the dorsal fin. The dorsal fin is positioned approximately equidistant between the operculum and the caudal fin, and it is the marking upon this fin that gives rise to the common names of the fish: the base colour is white, with a large rounded black oval overlaid upon the base colour, in appearance fancifully likened to an eye.
A fully mature individual Brevibora dosriocellata attains a standard length of 6 cm. There is a smaller variety, the Emerald Eye Rasbora which attains a standard length of 3.5 cm.
Males are cited as possessing a pinkish or reddish hue to the caudal fin during the breeding season (Walker, p. 98) whilst females lack this colour. Otherwise, visual differences between the sexes are far from obvious, and the principal reliable differentiating characteristic is the notably more rounded and fuller-bodied profile of gravid females.
Whilst the water chemistry of the habitat of Brevibora dorsiocellata is relatively uniform, with a pH of 6.0 to 6.5 and a hardness value ranging from 5 to 15°dH, the species is more adaptable with respect to general aquarium maintenance, and will tolerate a wider variation of pH and hardness so long as extremes are avoided. The principal factor to bear in mind is that like many fast-swimming and active species, the eye-spot rasbora has a greater than average need for clean, well-filtered water in order to maintain optimum health. Temperature range is usually cited as 20°C to 25°C for maintenance, rising to 27°C for breeding. Whilst water chemistry is not especially critical for maintenance, it becomes much more so for breeding: see "Reproduction" below for more details.
Like other rasboras, the eye-spot rasbora is a shoaling fish, and should be maintained in the aquarium as a group consisting of a minimum of 6 individuals, a larger number being preferable if space permits. Innes refers to the visual spectacle that a large shoal of these fishes presents in a spacious and well-furnished aquarium, which with the temperament of the fish is a reason for its popularity.
The species is relatively peaceful, though it is possible that some 'fin nipping' behaviour may occur if the species is kept with slow-moving and long-finned fishes in an aquarium. The incidence of this behaviour is not considered to be particularly marked, however, and is certainly not as visibly manifest as is the case with certain notorious species such as the tiger barb. However, the lively, fast-moving eye-spot Rasbora is most likely to be compatible with similarly active fishes. Among the species that may be kept in the same aquarium are small characins from South America, assorted small barbs, danios, other small rasboras, Corydoras catfishes, Otocinclus catfishes, the more peaceful dwarf cichlids (and peaceful cichlids such as Laetacara curviceps), and smaller labyrinth fishes. The eye-spot rasbora makes for an interesting 'contrast fish' in company with a shoal of a more brightly coloured species.
Furnishing the aquarium for the eye-spot rasbora should (as should be the case with all aquarium fish species) be guided principally by the features of its natural habitat. Therefore, the aquarium should have open swimming areas, interspersed with planted sections, the plants in question being a mixture of crown-leaved plants such as Aponogeton and Cryptocoryne with fine-leaved plants such as Myriophyllum. Being mainly an open water fish in the wild, using plant thickets for refuge from predation when danger threatens, the eye-spot rasbora is at home in a well-lit aquarium facilitating the growth of more demanding aquarium plants, though the fish is likely to appreciate the thoughtful provision of some floating plants for additional cover. The fish is mainly a middle and upper level swimming species.
Filtration should be of good quality, with a relatively high turnover rate. Moderate currents are appreciated by the species.
The species feeds upon small worms, crustaceans and insects in the wild (details available at FishBase), but in the aquarium individuals readily accept all good-quality aquarium foods. To condition the species for breeding, however, live foods should be provided, with bloodworm and mosquito larvae being the live foods of choice as they correspond closely to the wild diet. However, other live foods such as Daphnia or brine shrimp can also be used.
The lifespan of Brevibora dorsiocellata has not been systematically determined, but individuals in the aquarium can be expected, with good care, to live for 3 to 5 years.