Osteogaster oharai

Osteogaster oharai Tencatt, Carvalho, Silva & Britto, 2025

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Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Siluriformes (Catfishes) > Callichthyidae (Callichthyid armored catfishes) > Corydoradinae
Etymology: oharai: Named after Dr. Willian Massaharu Ohara, a distinctive ichthyologist, for his extensive contributions to knowledge of South American freshwater fishes, and his fundamental role in the professional history of LFCT, having generously donated dozens of species of Corydoradinae collected by him over the last decade; noun in a genitive case.

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; demersal. Tropical

Distribution Territories | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

South America: Brazil.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 4.3 cm SL male/unsexed; (Ref. 138114)

Short description Identification keys | Morphology | Morphometrics

This species is distinguished by the following characters: with an oblique dorsolateral longitudinal dark stripe on flanks, starting at first dorsolateral body plate and gradually descending towards middle portion of caudal-fin base, variably extending diffuse on ventral lobe of caudal fin; with a moderately-developed posterolateral portion of scapulocoracoid, not expanded mesially; dorsolateral stripe not extending anteriorly and meeting its counterpart on head (Ref. 138114).
Body shape (shape guide): elongated; Cross section: oval.

Biology     Glossary (e.g. epibenthic)

Captured in small streams, tributaries of the rio Aripuanã upstream the Dardanelos-Andorinhas waterfalls complex, where the average width was estimated in 2.18 m ± 0.80, depth in 17.0 cm ± 7.6, water current in 3.83 m/s ± 7.4, dissolved oxygen in 1.18 mg/l ± 0.99, and temperature in 25.1 °C ± 2.0. In the rio Juruena basin, most specimens were collected in small and shallow isolated pools of intermittent streams, directly flowing into the rio Juruena, also occurring in larger/deeper streams, as the igarapé do Boi Preto. In these sites (rio Juruena basin), the streams have dense marginal vegetation, muddy or dark tea-colored water, and substrate composed by sand and/or clay, leaf litter, submerged logs and branches, and large rocks. In the rio Juruena basin, no additional Corydoradinae species was found in syntopy (Ref. 138114).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Reis, Roberto E. | Collaborators

Tencatt, L.F.C., V. Carvalho, H.P. Silva and M.R. Britto, 2025. A new striped Osteogaster (Siluriformes: Callichthyidae) from the Madeira and Tapajós river basins, Brazil, with a new generic diagnosis and an identification key to the species of Osteogaster. Neotrop. Ichthyol. 23(2):e240134. (Ref. 138114)

IUCN Red List Status (Ref. 130435: Version 2025-2 (Global))

Not Evaluated 

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

FAO - Publication: search | FishSource |

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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, Search | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00741 (0.00287 - 0.01912), b=3.14 (2.92 - 3.36), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic level (Ref. 69278):  3.0   ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref. 120179):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100). 🛈