Actinopteri (ray-finned fishes) > Ovalentaria/misc
(Various families in series Ovalentaria) > Ambassidae
Etymology: Ambassis: Derived from Greek, anabasis = climbing up (Ref. 45335).
More on author: Günther.
Environment: milieu / climate zone / depth range / distribution range
Marine; freshwater; brackish; demersal; amphidromous (Ref. 51243); depth range 0 - 2 m (Ref. 86942). Tropical; 26°N - 27°S, 75°E - 172°W
Indo-West Pacific: India to New Guinea and New Caledonia, north to the Ryukyu Islands. Reported from Samoa (Ref. 592).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 10.3 cm TL male/unsexed; (Ref. 7050)
soft rays: 9 - 10. Resembles A. urotaenia, but differs in having large eye, and a gently-rounded snout. Eye diameter over 30% and interorbital width over 20% of head length. Cheek scales in 2 rows. Attains 8 cm TL.
Inhabits clear, flowing creeks, usually within 20 kilometers of the sea (Ref. 44894). Commonly found in brackish waters and river mouths. Occurs near mangroves, stagnant and running freshwater (Ref. 7300) and coastal areas (Ref. 45255). This species has a marine larval stage, judging from its broad distribution. One of the best viewing areas is at the Freshwater creek picnic ground in Cairns, where individuals frequently aggregate along the vegetated stream margin (Ref. 44894).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Paxton, J.R., D.F. Hoese, G.R. Allen and J.E. Hanley, 1989. Pisces. Petromyzontidae to Carangidae. Zoological Catalogue of Australia, Vol. 7. Australian Government Publishing Service, Canberra, 665 p. (Ref. 7300)
IUCN Red List Status (Ref. 125652)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 123201
): 26.2 - 29.3, mean 28.7 °C (based on 1629 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01230 (0.00506 - 0.02993), b=3.02 (2.83 - 3.21), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.5 ±0.41 se; based on food items.
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Assuming Fec > 10,000).
Fishing Vulnerability (Ref. 59153
): Low vulnerability (10 of 100).