Oncorhynchus biwaensis, Biwa salmon

Oncorhynchus biwaensis Fujioka, Kuwahara, Tabata, Fuke & Nakabo, 2025

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

Teleostei (teleosts) > Salmoniformes (Salmons) > Salmonidae (Salmonids) > Salmoninae
Etymology: Oncorhynchus: Greek, onyx, -ychos = nail + Greek, rhyngchos = snout (Ref. 45335); biwaensis: Name 'biwaensis' from the type locality of the species, Lake Biwa.

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

Freshwater; benthopelagic; depth range 40 - 90 m (Ref. 138051). Subtropical

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

Asia: Japan.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 24.1 cm SL (female)

Short description Identification keys | Morphology | Morphometrics

Dorsal soft rays (total): 14; Anal soft rays: 11 - 14. This species is distinguished from its congeners by the following set of characters: dorsal, anal, pectoral and pelvic fin-rays [14 (mode 14), 11-14 (13), 13-14 (14) and 9 (9), respectively]; scales above and below lateral line [19-22 (21) and 21-24 (24), respectively)]; 43-65 (56) pyloric caeca; 0-15 (0) red spots laterally on body less than ca. 20 cm SL; body particularly slender in immature juveniles, body depth 20.9-26.7% of SL (average 23.3%); snout short, moderately pointed, length 5.5-7.0% of SL (6.2%); eye small, diameter 4.2-6.3% of SL (5.2%); interorbit narrow, width 6.7-8.0% of SL (7.4%); scales oblong, length/width ratio 1.26-1.64 (1.48); focus slightly forward of center, length of apical area/ length of basal area 0.99-1.45 (1.21); ridges circular, not disappearing in apical area (Ref 138051).
Body shape (shape guide): elongated; Cross section: compressed.

Biology     Glossary (e.g. epibenthic)

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

Main reference Upload your references | References | Coordinator | Collaborators

Fujioka, Y., M. Kuwahara, R. Tabata, Y. Fuke and T. Nakabo, 2025. The Biwa salmon, a new species of Oncorhynchus (Salmonidae) endemic to Lake Biwa, Japan. Ichthyol. Res. 1-13. (Ref. 138051)

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

Not Evaluated 

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries: of no interest
FAO - Publication: search | FishSource |

More information

Trophic ecology
Food items (preys)
Diet composition
Food consumption
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Predators
Ecology
Ecology
Population dynamics
Growth parameters
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
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Life cycle
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Maturity
Maturity/Gills rel.
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References

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Summary page | Point data | Common names | Photos

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 |