Rhinogobius biwaensis

Rhinogobius biwaensis Takahashi & Okazaki, 2017

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

Teleostei (teleosts) > Gobiiformes (Gobies) > Gobiidae (Gobies) > Gobionellinae
Etymology: Rhinogobius: Greek, rhinos = nose + Latin, gobius = gudgeon (Ref. 45335); biwaensis: Named for its type locality, Lake Biwa.

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

Freshwater; benthopelagic, usually 10 - 30 m (Ref. 114784). Temperate

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

Asia: Japan.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 4.3 cm SL male/unsexed; (Ref. 114784); 3.3 cm SL (female)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 7; Dorsal soft rays (total): 7 - 9; Anal spines: 1; Anal soft rays: 8 - 9; Vertebrae: 25 - 27. This species is distinguished by the following characters: 26 (rarely 27) vertebrae; 18-22 (mostly 20-21) pectoral fin rays; 31-36 (usually 31-34, mode 32) longitudinal scales; absent or few predorsal scales; D1 low with non-filamentous spines, all almost of the same length except for shorter first and sixth or last spines in both sexes; pelvic disk with thin membranes, its frenum undeveloped with low, thin lamella; no mark on cheek; back and sides of body with 5-6 unclear dark saddles and 6-9 dark blotches; D1 without blotches but melanized to greater or lesser degree along the rays; dorsal edge of pectoral base with a small, dark spot tinged with blue metallic luster; breeding males yellow on suboperculum and branchiostegal region and on basal part of anal fin, blue on medial part of under jaw (Ref. 114784).
Body shape (shape guide): elongated; Cross section: oval.

Biology     Glossary (e.g. epibenthic)

Found in the lake mainly at 10-30 m, scarce in the mouths or lowest reaches of inflowing rivers, and in lagoons connected to Lake Biwa. From May to August, this species migrate to shallow water for spawning; all habitats are effectively lentic (Ref. 114784).

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

Main reference Upload your references | References | Coordinator | Collaborators

Takahashi, S. and T. Okazaki, 2017. Rhinogobius biwaensis, a new gobiid fish of the ‘‘yoshinobori’’ species complex, Rhinogobius spp., endemic to Lake Biwa, Japan. Ichthyol. Res. 2017 (Ref. 114784)

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

  Endangered (EN) (A2d+4d; B1ab(i,iii,v)); Date assessed: 01 March 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries: of no interest
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 |