Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Gobiidae
(Gobies) > Gobionellinae
Etymology: Eugnathogobius: Greek, eu = good + Greek, gnathos = jaw + Latin, gobius = gudgeon (Ref. 45335). More on author: Herre.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; brackish; demersal. Tropical
Western Pacific: Northeastern Borneo and the Philippines.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 3.6 cm TL male/unsexed; (Ref. 7050)
(total): 6 - 7;
soft rays: 5 - 8. Distinguished by the following characteristics: relatively large size; second dorsal rays I,6-8; pectoral rays 15-18; segmented caudal rays 15-17 (modally 16); longitudinal scales 25-34; TRB 8-12; predorsal scales 10-19; shoulder girdle with smooth low ridge or flange, rarely with fleshy lobes; mouth terminal, large, greatly enlarged in mature males (maxillary sometimes extending past rear edge of preoperculum); each scale on side of body with short dusky bar; two distinct brown stripes extending back from rear of eye and two from eye to snout tip; dark fins, dorsal fins distinctly spotted with brown (Ref. 80545).
A euryhaline species (Ref. 12041). Occurs in estuaries, primarily in slow flowing canals and smaller bodies of water. Feeds on small fishes and invertebrates, including mosquito larvae and entomostracans (Ref. 12693). The following aquarium observations describe its captive behavior and breeding: strictly benthic and quite secretive; males constructed nests under flat stones, shoveling sand with their large mouths while pieces of gravel (up to 12 mm diameter) are carried one by one; males display to each other with mouths wide open and may push against each other jaw to jaw, if observed may often switch to locking jaws (as if biting); about 1,000 eggs per batch (1.5 x 0.5 mm) and hatched after 44-95 hours at 25°C; larvae 2.4 mm long and floated up near the water surface until yolk absorbed after 124 hours, these then moved down into the water column (Ref. 80545). Not seen in the markets (Ref. 12693); rarely collected (Ref. 80545).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Larson, H.K., 2001. A revision of the gobiid fish genus Mugilogobius (Teleostei: Gobioidei), and its systematic placement. Rec. West. Aust. Mus. (Suppl. No. 62):1-233. (Ref. 43716)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5020 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00724 (0.00324 - 0.01618), b=3.01 (2.82 - 3.20), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.7 ±0.57 se; Based on food items.
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .