Sanaga pygmy herring (Thrattidion noctivagus) fish species and information / pictures of Sanaga pygmy herring - Thrattidion noctivagus

Sanaga pygmy herring (Thrattidion noctivagus) fish species information

Scientific Name
Thrattidion noctivagus

Common Name
Sanaga pygmy herring

Biology
Dorsal spines (total): 0; Dorsal soft rays (total): 12-18; Anal spines: 0; Anal soft rays: 23 - 25. Perhaps not much over 2 cm standard length. Pre-pelvic scutes 4 to 7, with lateral arms, but no keels; pelvic scute with 2 or 3 lateral arms; post-pelvic scutes keeled and with arms; anal fin starts under dorsal fin base. The presence of scutes distinguishes it from Congothrissa gossei; from all other West or central African pellonulines by the absence of a second supra-maxilla.

Classification

Classified By

Roberts, 1972

Class

Ray-finned fishes (Actinopterygii)

Order

Herrings (Clupeiformes)

Family

Herrings, shads and sardines (Clupeidae)

Distribution

Region

Africa

Distribution

Africa: Endemic to the Sanaga River at Edea, Cameroon.

Range

6°N - 3°N

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

3.3 s.e. 0.42 Based on food items.

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

2.1 cm

Common Length

Unknown cm

Phylogenetic Diversity Index

PD50 = 1.0000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Fisheries: of no interest

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

Data deficient (DD)