Oryzias sakaizumii, Northern medaka

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Oryzias sakaizumii Asai, Senou & Hosoya, 2012

Northern medaka
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Oryzias sakaizumii
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Classificatie / Names Populaire namen | Synoniemen | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (Straalvinnigen) > Beloniformes (Needle fishes) > Adrianichthyidae (Ricefishes) > Oryziinae
Etymology: Oryzias: Greek, oryza = rice; because of the habitat used by this fish (Ref. 45335);  sakaizumii: Named for Dr. Mitsuru Sakaizumi, a molecular geneticist at Niigata University, who pioneered in and contributed to the field of molecular phylogenetic study of Japanese ricefishes.

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

; zoetwater pelagisch.   Tropical; 36°N - 35°N, 136°E - 137°E

Verspreiding Landen | FAO regio's | Ecosystems | Voorkomen | Point map | Introducties | Faunafri

Asia: freshwaters along the Sea of Japan coast in the northern half of Honshu, from the Pacific coast of Momoishi, Aomori Pref. to Hyogo Pref. around Tango, Tajima district that distributional western limit is Hamasaka.

Size / Gewicht / Leeftijd

Maturity: Lm ?  range ? - ? cm
Max length : 3.7 cm SL mannelijk/geslacht niet bekend; (Ref. 89067)

Korte beschrijving Morfologie | Morfometrie

Oryzias sakaizumii is distinguished from all other congeners including O. latipes that are distributed throughout east Asia by the following combination of characters: distribution of melanophores, dense network of melanophores along each scale margin on the body surface in both sexes; depth of notch in membrane between dorsal-fin rays 5 and 6 less than half the length of rays in males; distinctive irregular black spots on the posterior portion of body lateral; and several silvery scales in patches on the posterior portion of the body (Ref. 89067).

Biologie     Verklarende woordenlijst (b.v. epibenthic)

Occurs in ponds, marshes, and streams, such as irrigation canals amid paddy fields in flat alluvial lowlands. Well adapted to aquatic life on temporary floodplain wetlands (Ref. 89067).

Life cycle and mating behavior Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven

Voornaamste referentie Upload your references | Referenties | Coördinator : Seegers, Lothar | Medewerkers

Asai, T., H. Senou and K. Hosoya, 2012. Oryzias sakaizumii, a new ricefish from northern Japan (Teleostei: Adrianichthyidae). Ichthyol. Explor. Freshwat. 22(4):289-299. (Ref. 89067)

Status op de Rode Lijst van het IUCN (Ref. 120744)

  Niet bedreigd (LC) ; Date assessed: 01 March 2018

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaarlijk voor mensen

  Harmless





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Estimates based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00479 (0.00185 - 0.01240), b=3.13 (2.90 - 3.36), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.4   ±0.4 se; Based on size and trophs of closest relatives
Weerstandsvermogen (Ref. 120179):  Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden ().
Kwetsbaarheid (Ref. 59153):  Low vulnerability (10 of 100) .