Freshwater fishes

The fish list

542 species, each with the water it needs, who it gets along with, and where it comes from. Find one, or browse by family, genus or river.

Endangered Rare Popular Peaceful Small (6 cm or less)✓ Calm water Strong flow Schooling L-numbers With photo Basic profiles too

The fishes 52 fish · new every day

← Earlier fishes

Harlequin rasbora

Harlequin rasbora

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Rasboras & danios · TrigonostigmaStaple

Harlequin rasbora

Trigonostigma heteromorpha

Peat swamp streams, Malay Peninsula and Sumatra · swamp or paddy

Temperature: 22–28°C
pH: 5–7.5
Adult size: 1.8 in · 4.5 cm
Flow: Calm
Swims: Mid-water
Temperament: Peaceful
Diet: Omnivore
Group: 8+
Typical price: $3–5
Rarity: Pet-store staple

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Photo: NasserHalaweh, CC BY-SA 4.0

Golden pencilfish

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Tetras · NannostomusStaple

Golden pencilfish

Nannostomus beckfordi

Amazon basin and the Guianas · blackwater stream

Temperature: 24–28°C
pH: 5.5–7.5
Adult size: 1.8 in · 4.5 cm
Flow: Calm
Swims: Top and mid-water
Temperament: Peaceful
Diet: Omnivore
Group: 6+
Typical price: $3–6
Rarity: Pet-store staple

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Threadfin acara

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Cichlids · AcarichthysLC

Threadfin acara

Acarichthys heckelii

Northern Amazon basin (Colombia, Peru, Brazil) and Essequibo, Guyana · river

Temperature: 24–30°C
pH: 6–8
Adult size: 8 in · 20 cm
Flow: Calm
Swims: Mid-water
Temperament: Semi-aggressive
Diet: Omnivore
Group: 2+
Status in the wild: Least concern

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Platy

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Livebearers · XiphophorusStaple

Platy

Xiphophorus maculatus

Atlantic slope of Mexico and Central America · stream

Temperature: 20–26°C
pH: 7–8.2
Adult size: 2 in · 5 cm
Flow: Calm
Swims: Mid-water and top
Temperament: Peaceful
Diet: Omnivore
Group: 3+
Typical price: $2–5
Rarity: Pet-store staple

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