Mai-ndombe dwarf sprat (Nannothrissa stewarti) fish species and information / pictures of Mai-ndombe dwarf sprat - Nannothrissa stewarti

Mai-ndombe dwarf sprat (Nannothrissa stewarti) fish species information

Scientific Name
Nannothrissa stewarti

Common Name
Mai-ndombe dwarf sprat

Biology
Dorsal spines (total): 0; Dorsal soft rays (total): 12-18; Anal spines: 0; Anal soft rays: 17 - 19. Body slender or moderate. Scutes (16 to 18 total) a little behind isthmus, very strongly keeled (even at 2.2 cm standard length). Lower jaw very slightly projecting, toothless; no teeth on pre-maxillae or maxillae; second supra-maxilla as deep as maxilla blade and with long slender anterior shaft. Pelvic fin insertion just below dorsal fin origin.

Classification

Classified By

Poll & Roberts, 1976

Class

Ray-finned fishes (Actinopterygii)

Order

Herrings (Clupeiformes)

Family

Herrings, shads and sardines (Clupeidae)

Distribution

Region

Africa

Distribution

Africa: Lake Mai-ndombe and Inongo near Ipeke, Congo system.

Range

0°S - 3°S

Environment

Climate

Tropical

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

Unknown m

Depth To - meters

Unknown m

Zone

pelagic

Environment

Freshwater; pelagic

Trophic Level

3.04 s.e. 0.35 Based on size and trophs of closest relatives

Occurs in Marine / Salt water

False

Occurs in Brackish water

False

Occurs in Fresh Water

True

Occurs on Reefs

False

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

2.3 cm

Common Length

Unknown 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: subsistence fisheries

Vulnerability

Low vulnerability (10 of 100)

Resilience

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

Threat To Humans

Harmless

IUCN Red List Status

Endangered (EN) (B1ab(v))