Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Siluriformes
(Catfish) > Ariidae
(Sea catfishes) > Ariinae
Etymology: Amphiarius: The first part of name from Greek 'amphi' meaning on both sides or double, referring to the occurrence of the included species both in fresh and marine waters; the second part is from the frequently used ariid generic name Arius.. More on author: Valenciennes.
Environment: milieu / climate zone / depth range / distribution range
Marine; brackish; demersal; depth range 1 - 20 m (Ref. 5217). Tropical; 12°N - 1°S, 72°W - 48°W
Western Atlantic: Venezuela to mouth of the Amazon River, Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 35.5 cm TL male/unsexed; (Ref. 108869); common length : 20.0 cm TL male/unsexed; (Ref. 3265)
Occurs in brackish estuaries with very low salinities, nearly entering freshwater (Ref. 5217). Found on shallow muddy bottoms (Ref. 5217). The female lays her eggs in a gelatinous mass on a sandy depression. Mouth brooding males guard the eggs until hatching (Ref. 35381). Marketed fresh.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Taylor, W.R. and N.A. Menezes, 1978. Ariidae. In W. Fischer (ed.) FAO species identification sheets for fishery purposes. West Atlantic (Fishing Area 31). volume 1. [pag. var.]. FAO, Rome. (Ref. 3265)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Traumatogenic (Ref. 58010)
Fisheries: minor commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 26.8 - 27.9, mean 27.5 (based on 144 cells).
Phylogenetic diversity index (Ref. 82805
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00708 (0.00437 - 0.01147), b=3.18 (3.03 - 3.33), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic Level (Ref. 69278
): 3.5 ±0.5 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate vulnerability (35 of 100) .