Stenogobius ophthalmoporus (Bleeker, 1853)
Biyang tulis,  Biyang pakiu

Family:  Gobiidae (Gobies), subfamily: Gobionellinae
Max. size:  14.21 cm SL (male/unsexed)
Environment:  demersal; freshwater; brackish
Distribution:  Asia: Japan, Taiwan, Viet Nam, Philippines and Indonesia.
Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 10-10; Anal spines: 1-1; Anal soft rays: 9-10. Predorsal midline fully scaled, usually 19-21; cheek almost always naked; opercle scaled; pectoral base scaled; belly scaled anteriorly near pelvic base; breast always with exposed or embedded scales; basal half of first dorsal fin with two black bands, lower band may originate behind first or second spine; sexual dichromatism not well developed (Ref. 34009).
Biology:  Known from estuaries to lowland rivers and streams in fresh water.
IUCN Red List Status: Least Concern (LC); Date assessed: 27 August 2018 Ref. (130435)
Threat to humans:  harmless
Country info:  Specimens collected from Cagayan River, barrio Catayaoan, lallo, Cagayan Province were described by Herre and deposited in the collection of the Division of Fisheries of the Department of Agriculture and Commerce (Ref. 12789). Aparrius sabagensis Roxas & Blanco 1940 is probably a synonym of this species (Ref. 7442). Also Ref. 7050, 34009.


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