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Redhook myleus (Myloplus rhomboidalis) — Serrasalmidae

Redhook myleus

Myloplus rhomboidalis
Family: Serrasalmidae
LC · Least Concern

The Redhook myleus (Myloplus rhomboidalis) is a freshwater fish of the family Serrasalmidae that grows up to 40 cm.

Length
40 cm
Water
Freshwater
Diet
Herbivore
Behaviour
Schooling
Activity
Diurnal
Substrate
Open water
Danger
Harmless
Range
Fresh water of northern South America (the Amazon and Guiana region), in clear, forested rivers and creeks.
Edibility
Commonly eaten

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Description

The redhook myleus is a large, deep and strongly compressed, rhombus-shaped characin of the family Serrasalmidae reaching about 40 cm; the group is also called 'silver dollar'. The silvery body has a strikingly red, sickle-shaped anal fin. Unlike the related piranhas this is a peaceful plant-eater: it lives on water plants, leaves, fruit and seeds, supplemented with insects, and helps disperse seeds in flooded forest. The species comes from clear, forested rivers and creeks of the Amazon and Guianas region and swims in schools. With its size it is locally a food fish, and young animals, with their coin shape and red fin, are popular in the aquarium hobby.

Frequently asked questions

How do you recognise the Redhook myleus?

The Redhook myleus is mainly silver-grey and shows a plain pattern. Large, deep-bodied, strongly laterally flattened, diamond-shaped characin with a red anal fin; a peaceful plant eater, not a piranha.

Where does the Redhook myleus live?

The Redhook myleus lives in fresh water and is mostly found around open water. Fresh water of northern South America (the Amazon and Guiana region), in clear, forested rivers and creeks.

How big does the Redhook myleus get?

The Redhook myleus grows to a maximum of about 40 cm.

Is the Redhook myleus dangerous to humans?

No, the Redhook myleus is harmless to humans. None required: this species is harmless to humans.

Is the Redhook myleus edible?

Yes, the Redhook myleus is commonly eaten.

More photos

Redhook myleus (Myloplus rhomboidalis) — Serrasalmidae — 2
Naturalis Biodiversity Center (CC0 1.0) via GBIF
Redhook myleus (Myloplus rhomboidalis) — Serrasalmidae — 3
iNaturalist ((c) Thomas Diemer, some rights reserved (CC BY-NC))
Redhook myleus (Myloplus rhomboidalis) — Serrasalmidae — 4
Naturalis Biodiversity Center (CC0 1.0) via GBIF
Redhook myleus (Myloplus rhomboidalis) — Serrasalmidae — 5
Naturalis Biodiversity Center (CC0 1.0) via GBIF
Fin

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All data

Identification

English name
Redhook myleus verified
Scientific name
Myloplus rhomboidalis
Family
Serrasalmidae

Appearance

Size class
Medium
Max length (cm)
40 verified
Dominant colour
Silver / grey sourced
Pattern
Plain sourced
Tail shape
Forked inferred
Mouth position
Terminal inferred
Lips
Thick / fleshy inferred
Barbels
No verified
Dorsal fins
One continuous sourced
Dorsal spines
No verified

Habitat & distribution

Water type
Freshwater verified
Substrate
Open water verified
Natural range
Fresh water of northern South America (the Amazon and Guiana region), in clear, forested rivers and creeks. verified
Origin
Native verified

Behaviour & biology

Diet
Herbivore verified
Diet (detail)
Aquatic plants, leaves, fruits and seeds, supplemented with insects sourced
Social behaviour
Schooling verified
Territorial
No verified
Activity
Diurnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
Yes verified
Seasonality
Spawns in the rainy season in flooded forest; it then eats a lot of fallen fruits and seeds. sourced
Special features
Large, deep-bodied, strongly laterally flattened, diamond-shaped characin with a red anal fin; a peaceful plant eater, not a piranha. sourced

For anglers

Edibility
Commonly eaten verified
Fishing method
Fishing with plant bait or paste bait on a bottom or float rig. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified
First aid
None required: this species is harmless to humans. sourced

Status & sources

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

Same genus Myloplus

More from the family Serrasalmidae

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