Teleostei (teleosts) > Gobiiformes
(Gobies) > Gobiidae
(Gobies) > Sicydiinae
Etymology: Sicyopterus: Greek, sika, sikya = cucumber + Greek, pteron = wing, fin (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Marine; freshwater; brackish; demersal; amphidromous (Ref. 51243). Tropical; 19°N - 6°S
Asia: Japan, the Philippines, Indonesia; and Papua New Guinea.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 9.7 cm TL male/unsexed; (Ref. 7050)
Morphology | Morphometrics
(total): 10. This species is distinguished by the following characters: upper lip with no median cleft, but with a lateral cleft on each side of lip; margin of upper lip between lateral clefts minutely serrated; no tubercle behind median cleft; ridge beneath the upper lip only with feeble papillae; premaxillary teeth tricuspid; first dorsal-fin spines, especially second to fifth spines, are long and filamentous in males; posterior tip of first dorsal fin often exceeding the base of last soft ray of second dorsal fin in males, while the second to fourth spines of first dorsal fin in females are somewhat elongate, but the tip of fin not extending to middle of second dorsal-fin base; membranes notched between spines in female; D I,10; caudal fin with 17-18 (usually 17) segmented rays, including 15-16 branched rays; pectoral fin rays 20-21; scales in longitudinal series 49-57; scales on nape and occipital region considerably smaller than scales on lateral sides of body (Ref. 125665).
Lives in coastal streams with moderate to fast flow (Ref. 2847). Usually found in small. clear creeks, often in rainforest within about 50 km of the sea (Ref. 2847).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Maeda, K. and T. Saeki, 2018. Revision of species in Sicyopterus (Gobiidae: Sicydiinae) described by de Beaufort (1912), with a first record of Sicyopterus longifilis from Japan. Species Diversity 23:253-262. (Ref. 125665)
IUCN Red List Status (Ref. 126983)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82804
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153
): Low vulnerability (10 of 100).