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Fighting gaucho (Cynopoecilus melanotaenia) — Rivulidae

Fighting gaucho

Cynopoecilus melanotaenia
Family: Rivulidae

The Fighting gaucho (Cynopoecilus melanotaenia) is a freshwater fish of the family Rivulidae that grows up to 4 cm.

Length
4.3 cm
Water
Freshwater
Diet
Carnivore
Body shape
Elongated (eel-like)
Substrate
Mixed bottom
Danger
Harmless
Range
South America: Brazil, Uruguay
Edibility
Commonly eaten

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Description

The fighting gaucho is an annual killifish (Rivulidae) from fresh water of southern Brazil and Uruguay. The species grows to about 4 cm; males are handsomely coloured with dark bands and glowing spots, females duller. It lives in temporary pools that dry up in the dry season; the eggs survive for months in the dry soil and hatch once the rains return. It eats small invertebrates. The fish is harmless to humans.

Frequently asked questions

How do you recognise the Fighting gaucho?

The Fighting gaucho has an elongate, eel-like body, is mainly brown and shows a vertical stripes pattern.

Where does the Fighting gaucho live?

The Fighting gaucho lives in fresh water and is mostly found around mixed bottom. South America: Brazil, Uruguay

How big does the Fighting gaucho get?

The Fighting gaucho grows to a maximum of about 4 cm.

Is the Fighting gaucho dangerous to humans?

No, the Fighting gaucho is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.

Is the Fighting gaucho edible?

Yes, the Fighting gaucho is commonly eaten.

More photos

Fighting gaucho (Cynopoecilus melanotaenia) — Rivulidae — 2
Wikimedia Commons — W.S.Serra (CC BY-SA 4.0)
Fighting gaucho (Cynopoecilus melanotaenia) — Rivulidae — 3
iNaturalist ((c) matheuslrosa, some rights reserved (CC BY-NC))
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All data

Identification

English name
Fighting gaucho sourced
Scientific name
Cynopoecilus melanotaenia
Family
Rivulidae
Other names
Killifish sourced

Appearance

Size class
Small verified
Max length (cm)
4.3 verified
Body shape
Elongated (eel-like) sourced
Dominant colour
Brown sourced
Pattern
Vertical bars sourced
Tail shape
Rounded inferred

Habitat & distribution

Water type
Freshwater sourced
Substrate
Mixed bottom sourced
Natural range
South America: Brazil, Uruguay sourced
Origin
Native inferred

Behaviour & biology

Diet
Carnivore inferred
Diet (detail)
Small fishes, crustaceans and invertebrates inferred
Territorial
No inferred
Reproduction
Separate sexes inferred
Sexual dimorphism
Yes sourced
Seasonality
Present year-round in its habitat; no pronounced seasonality known. inferred

For anglers

Edibility
Commonly eaten inferred
Fishing method
Small in size and barely an angling target; mostly caught incidentally or as baitfish. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified
First aid
This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status. verified

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

More from the family Rivulidae

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