Pristigaster cayana Cuvier, 1829

Amazon hatchet herring

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Clupeiformes \| Pristigasteridae
Synonyms	Pristigaster americanus, Pristigaster martii, Pristigaster phaeton, ... more
Common names	Sardinita, Amazon-øksesild, 亚马逊锯腹鳓, ... more

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Image of Pristigaster cayana (Amazon hatchet herring)

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Main reference

Whitehead, P.J.P. 1985. (Ref. 188)
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Size / Weight / Age

Max length : 14.5 cm SL male/unsexed; (Ref. 50591); common length : 8.5 cm SL male/unsexed; (Ref. 188)

Environment

Pelagic; freshwater; brackish

Climate / Range

Tropical; 1°N - 2°S

South America: Amazon drainage (from perhaps mouth of Rio Branco at Goiaçu, Rio Solimões, Rio Juruá and as far as the Río Ucayali in Peru). (There are possibly two species, judging from specimens in the Museu de Zoológia, Sao Paulo).
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 0; Anal spines: 0; Anal soft rays: 45 - 54. Belly profile strongly convex (almost circular from throat to anus), 30 to 33 scutes. Lower jaw projecting, mouth directed almost vertically upward; no toothed hypo-maxillary bone between hind end of pre-maxilla and lower bulge of maxilla blade; eye large. Pectoral fins high on body; anal fin origin behind dorsal fin base; upper caudal fin lobe ending in a filament in larger fishes (Ref. 188).

Occurs in rivers but perhaps entering slightly saline waters near the mouth of Amazon (but this part of its range is not well documented). Compared with the `flying' characoid fishes (e.g. Thoracocharax), the vertically aligned scute arms in Pristigaster and the rather small pectoral muscles show that flight by vibration of the pectoral fins is almost certainly impossible. This species having been caught along with Thoracocharax raises the question of mimicry.


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: of no interest


More information
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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low vulnerability (11 of 100)	High

Entered by Binohlan, Crispina B.

Modified by Froese, Rainer

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Page last modified by : elaxamana, 15 July 2009

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