Taxonomy & naming
Puntius melanostigma was described by A. G. K. Menon in 1978. The species is placed in the genus Puntius sensu stricto as understood by the Catalog of Fishes (Eschmeyer, CAS), the authority for valid names. Following the landmark revision by Pethiyagoda et al. (2012), the old catch-all Puntius was split into several segregate genera — Pethia, Dawkinsia, Systomus, and others — but not all Indian barbs were redistributed; P. melanostigma continues to be listed under Puntius in current checklists.
The specific epithet melanostigma comes from the Greek melas (black) and stigma (mark or spot), referring to black pigmentation that characterises the fish. The species has no widely used common name in the aquarium trade or in the regional fisheries literature.
Morphology
Puntius melanostigma is a moderately small barb reaching approximately 4 in in standard length (SL) per FishBase data. Like other members of the genus it is laterally compressed, with a relatively deep body and the blunt snout typical of small Indian Puntius. The black markings implied by the species name are the most diagnostic feature; precise details of fin counts, scale rows, and lateral-line scale counts are recorded in Menon's original description but are not reproduced in the sources available for this account.
Data on colouration and secondary sex differences in the wild are sparse in the accessible literature. Sexual dimorphism is expected to follow the pattern common to the genus — gravid females becoming noticeably deeper-bodied than males — but no detailed description of field colouration or aquarium colour forms is available.
Habitat
Puntius melanostigma is reported from the Northern Eastern Ghats of India, where it is endemic. A morphological study of six barb species across the region documented the species in both lentic (standing) and lotic (flowing) habitats — a range of hydrodynamic conditions that has been associated with measurable variation in body shape and growth patterns among Indian cyprinids.
FishBase characterises the species as a hill-stream fish favouring flowing, well-oxygenated water, which is consistent with the typical Eastern Ghats upland environment: clear, fast-moving streams running through degraded scrub and forest, with gravel or rocky substrates. Precise altitude ranges, substrate preferences, and associated fish communities are not reported in sources currently available for this account.
Feeding
No detailed dietary study of Puntius melanostigma appears in the literature accessible for this account. Indian hill-stream barbs of comparable size are generally opportunistic omnivores, taking small aquatic and terrestrial invertebrates, algal films, plant fragments, and fine detritus from the substrate and water column.
By analogy with closely related Puntius species from peninsular India, the diet is expected to shift seasonally in response to invertebrate availability and flood-driven organic inputs — a pattern well documented across the group. Stomach-content analysis from wild-caught specimens has not been reported.
Mating
Puntius melanostigma has not been documented in captive breeding, and no specific spawning observations from the wild appear in the accessible literature. The species is expected to follow the egg-scattering, non-guarding reproductive strategy universal to Puntius and the broader cyprinid barb clade.
In this mode a driving male pursues a gravid female through vegetation or over the substrate, and the pair release eggs and milt in brief pressing contacts. No pair bond is formed, no nest is constructed, and no territory is defended beyond transient courtship chases. Spawning is typically triggered by seasonal rises in water temperature and flow associated with pre-monsoon rains across peninsular India.
Breeding
No captive breeding account for Puntius melanostigma is recorded in hobbyist or scientific literature accessible for this profile. Based on the biology of comparable Indian Puntius, breeding in the wild is expected to be a seasonal, egg-scattering event tied to monsoon hydrology — adult fish scatter adhesive eggs among aquatic plants, submerged roots, or fine gravel, then abandon them with no parental care. Eggs and larvae are left to develop unattended, and adults may consume eggs given the opportunity.
In an aquarium context, standard egg-scatterer protocol — a fine-leaved plant or spawning mop, slightly cooler, soft water to trigger conditioning, and removal of adults after spawning — would be the logical starting point, though no confirmed account exists.
In the aquarium
Puntius melanostigma is not an established aquarium fish and is essentially absent from the hobby trade. No care accounts, tank size recommendations, or compatibility notes appear in the accessible literature. Its origin in Eastern Ghats hill streams suggests an affinity for clean, well-oxygenated, moderately cool water with good flow — broadly similar conditions to those recommended for other Indian hill-stream cyprinids.
Any future introduction to the aquarium hobby would likely follow the standard template for small Indian barbs: a spacious tank with steady filtration, near-neutral pH, moderate hardness, and a temperature in the range of upland Indian streams. As a shoaling cyprinid it would be expected to do best in groups.
Conservation
Puntius melanostigma is assessed as Least Concern (LC) on the IUCN Red List (2025 assessment), indicating that it currently meets no threshold for a threatened category. The species is endemic to India, with its range centred on the Northern Eastern Ghats — a biodiversity region under sustained pressure from agricultural expansion, mining, and water abstraction.
While Least Concern status implies no immediate extinction risk, small-ranged Indian endemics in upland systems are vulnerable to localised events: dam construction, deforestation leading to sedimentation of hill streams, and pollution from both agricultural runoff and domestic sewage. The species' tolerance of both standing and flowing water may confer some resilience relative to strict lotic specialists, but baseline population data and trend information are not available in the public literature.