Scientific Name
Gymnocharacinus bergii

Common Name
Naked characin

Biology
Medium sized fish considered to be the most southern characid living in temperate waters. Young with very tiny soft and delicate scales which are reabsorbed into the skin making the skin greasy and often with granulated or spongy appearance (Ref. 7252).

Classification

Classified By

Steindachner, 1903

Class

Ray-finned fishes (Actinopterygii)

Order

Characins (Characiformes)

Family

Characins (Characidae)

Distribution

Region

South America

Distribution

South America: Valcheta stream in Rio Negro basin, Southern Argentina.

Range

35°S - 36°S

Environment

Climate

Subtropical

Water Temperature From

22 °C

Water Temperature To

26 °C

Depth From - meters

Unknown m

Depth To - meters

Unknown m

Zone

demersal

Environment

Freshwater; demersal

Trophic Level

3 s.e. 0.36 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

True

Physical Size and Genetics

Maximum Length

7.5 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; aquarium: commercial

Vulnerability

Low vulnerability (15 of 100)

Resilience

High, minimum population doubling time less than 15 months (tm=1)

Threat To Humans

Harmless

IUCN Red List Status

Endangered (EN) (A2ce, B1+2c)