Taxonomy & naming
Lebiasina ortegai was described by Ardila Rodríguez in 2008. The type locality is a quebrada (stream) that is a tributary of Río Las Cañas, approximately 200 metres before the Florida–Miranda road in Florida Municipality, Valle del Cauca, Colombia. The holotype is deposited at IMCN under catalogue number 4200. Eschmeyer's Catalog of Fishes (CAS) confirms the valid name as Lebiasina ortegai Ardila Rodríguez, 2008, placed within the family Lebiasinidae and subfamily Lebiasininae.
The species epithet ortegai is a patronym, presumably honouring a person named Ortega associated with the original description or its fieldwork, though the dedicatee details are not available in the cached sources. The genus Lebiasina was established by Valenciennes (in Cuvier & Valenciennes, 1846) and encompasses robust, somewhat elongated lebiasinids distributed through river systems from Panama and Colombia to Peru and Bolivia. Within Lebiasinidae, Lebiasina is one of the more species-rich genera; its members are distinguished from the pencil-fish groups (Nannostomus, Copella) by their larger, less slender body form and more predatory lifestyle.
Morphology
FishBase records a maximum total length of 4 in for Lebiasina ortegai, placing it at the mid-range for the genus. Like other Lebiasina, it has a moderately robust, fusiform body, a relatively large mouth suited to seizing prey, and the typical lebiasinid arrangement of a single dorsal fin set well back over the posterior body. The caudal fin is forked. Specific meristic data from the original description (scale row counts, fin-ray formulae) are not reproduced in the available sources.
Colour pattern details specific to L. ortegai are not well documented in the accessible literature. Congeners typically show a dark lateral stripe or series of blotches running from behind the operculum to the caudal peduncle, often on a silvery to olive-tan background. Sexual dimorphism in Lebiasina is generally subtle; size differences and slight differences in body depth between sexes have been noted in the genus but are not specifically recorded for this species.
Habitat
Lebiasina ortegai inhabits clear-water streams in the Río Cauca system in the Colombian Andes piedmont, specifically recorded from Quebrada Las Cañas near Florida, Valle del Cauca. FishBase describes the habitat as clear waters over clay and organic substrates — a typical Andean piedmont quebrada environment of moderate to swift current, cool temperatures, and high dissolved oxygen relative to lowland sites.
Data from a closely related congener (L. erythrinoides) collected in the same Colombian Andes piedmont context provides the best available proxy for conditions at the type locality: water temperature around 72 °F, pH 7.2, conductivity approximately 27 µS/cm, and dissolved oxygen near 1.25 mg/L. These soft, slightly acidic to neutral, cool montane stream conditions are consistent with what would be expected from a highland Cauca tributary. The species is classified as benthopelagic in freshwater, suggesting it forages in the lower and mid-water column rather than being strictly bottom-hugging.
Feeding
Specific dietary studies for Lebiasina ortegai are absent from the available literature. Based on the feeding ecology of the genus and the family, L. ortegai is almost certainly a carnivore or micro-predator: Lebiasina species are known to feed on small invertebrates, aquatic insect larvae, surface-fallen insects, and small crustaceans. The robust build and sizable mouth of Lebiasina relative to more slender lebiasinids like Nannostomus is consistent with a more active predatory mode.
In an aquarium context, congeners in the genus will accept live and frozen foods readily — Daphnia, bloodworm, brine shrimp, and small insect larvae — as well as high-protein prepared foods. A predominantly animal-protein diet is recommended, reflecting the genus's natural trophic position in montane stream food webs.
Mating
No specific breeding or mating behaviour has been documented for Lebiasina ortegai in the available literature. Within Lebiasinidae more broadly, reproductive strategies span from open egg-scattering among plants or substrate to more elaborate systems: some lebiasinids deposit adhesive eggs among fine-leaved vegetation with limited or no parental attention, while others (notably Copella arnoldi, the splash tetra) engage in parental care of eggs deposited above the waterline. Lebiasina species tend toward egg-scattering or simple substrate-spawning without sustained parental care, though detailed studies for most species in the genus are lacking.
Given the absence of documented mating data for this species, aquarists working with Lebiasina generally condition adults on live foods and provide fine-leaved plants or spawning mops as potential substrate. Morning light appears to trigger spawning activity in related lebiasinids, consistent with the family's general pattern.
Breeding
Captive breeding of Lebiasina ortegai has not been reported in the accessible literature, and the species is not established in the ornamental fish hobby. Based on what is known of family Lebiasinidae breeding biology, a reasonable working expectation is egg-scattering among plant matter or fine substrate, with adhesive or semi-adhesive eggs that receive no parental care and will be consumed by adults if left in the spawning vessel.
In congeners and related lebiasinids, small clutches are typical, water temperature and food quality influence spawning readiness, and fry are small enough to require fine first foods (infusoria, rotifers, newly hatched brine shrimp) for the first days after yolk absorption. The cool-water conditions of the type locality (estimated around 68–75 °F) suggest that breeding attempts should avoid the higher temperatures used for many tropical tetras.
In the aquarium
Lebiasina ortegai is essentially unknown in the ornamental fish trade. The genus Lebiasina appears only sporadically in specialist hobbyist circles, and this species — known from a single locality in the Colombian Andes — is unlikely to appear except through dedicated collection. Aquarists keeping Lebiasina species generally house them in species-specific tanks or with similarly sized and robust companions, as these fish are active and can be predatory toward very small tankmates.
For any Lebiasina, water conditions matching the Andean piedmont origin are advisable: temperatures in the low-to-mid 20s Celsius, near-neutral to slightly acidic pH, low conductivity, and good oxygenation. Gentle to moderate water movement, shaded areas with plant cover, and a diet of live or frozen invertebrates will keep the fish in good condition. Given the restricted natural range of L. ortegai, any specimens in captivity should be considered ecologically significant and ideally kept in pairs or small groups with breeding attempted.
Conservation
Lebiasina ortegai was assessed as Least Concern (LC) by the IUCN in 2014. The assessment date (10 October 2014) and status are confirmed by FishBase, though the direct numeric IUCN species-page URL was not resolved in the available sources. The LC designation reflects an absence of documented evidence of rapid decline rather than confirmed abundance; the species is known only from the Quebrada Las Cañas drainage in Florida Municipality, Valle del Cauca — a narrow endemic with inherently limited distributional resilience.
The Río Cauca basin in Colombia has experienced widespread water-quality degradation from agricultural run-off, urban development, and water abstraction. Andean piedmont quebradas are among the habitats most affected by land-use change in Colombia. While no targeted conservation programme for L. ortegai is known to exist, the health of its apparent single-locality habitat is directly tied to land management in the Florida–Miranda area of Valle del Cauca. Any future re-assessment should consider the species' restricted range alongside ongoing threats to Colombian highland stream ecosystems.