Jenyns's sprat (Ramnogaster arcuata) fish species and information / pictures of Jenyns's sprat - Ramnogaster arcuata

Jenyns's sprat (Ramnogaster arcuata) fish species information

Scientific Name
Ramnogaster arcuata

Common Name
Jenyns's sprat

Biology
Dorsal spines (total): 0; Dorsal soft rays (total): 18-19; Anal spines: 0; Anal soft rays: 12 - 23. Belly sharply keeled. Flanks silvery without a distinct silver stripe (cf. Platanichthys). Distinguished from R. melanostoma of freshwaters by having more dorsal and pectoral fin rays and total gill rakers; from small Sardinella and Harengula by the evenly rounded hind margin of the gill opening; and from Sprattus fuegensis by having i 6 pelvic fin rays.

Classification

Classified By

Jenyns, 1842

Class

Ray-finned fishes (Actinopterygii)

Order

Herrings (Clupeiformes)

Family

Herrings, shads and sardines (Clupeidae)

Distribution

Region

Southwest Atlantic

Distribution

Southwest Atlantic: southern Brazil (estuary of the Lagoa dos Patos) and Uruguay to at least Bah?a Blanca, Argentina; some of the more southerly records (even to the Beagle Channel) must refer to Sprattus fuegensis.

Range

33°S - 42°S, 64°W - 52°W

Environment

Climate

Subtropical

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

0 m

Depth To - meters

50 m

Zone

pelagic-neritic

Environment

Marine; pelagic-neritic; depth range 0 - 50 m (Ref. 188)

Trophic Level

3.19 s.e. 0.37 Based on size and trophs of closest relatives

Occurs in Marine / Salt water

True

Occurs in Brackish water

False

Occurs in Fresh Water

False

Occurs on Reefs

False

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

9.0 cm

Common Length

7.5 cm

Phylogenetic Diversity Index

PD50 = 0.7500 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Fisheries: minor commercial

Vulnerability

Low vulnerability (12 of 100)

Resilience

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

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated