Freshwater fishes

The fish list

499 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

Showing: Home water: Blackwater stream ✕

Blackwater stream 5 fish

Cardinal tetra

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Tetras · ParacheirodonStaple

23–29°C
pH 4.5–7
Calm
1.6 in
Mid
Mixed
Peaceful
6+ group!

Cardinal tetra

Paracheirodon axelrodi

Rio Negro and upper Orinoco, Brazil and Venezuela · blackwater stream

Temperature: 23–29°C
pH: 4.5–7
Adult size: 1.6 in · 4 cm
Flow: Calm
Swims: Mid-water
Temperament: Peaceful
Diet: Omnivore
Group: 6+
Typical price: $3–7
Rarity: Pet-store staple

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Photo: Paolo Neo, Public domain

Marbled hatchetfish

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Tetras · CarnegiellaStaple

24–28°C
pH 5.5–7
Calm
1.4 in
Top
Meat
Peaceful
6+ group!

Jumper. Keep a tight lid on the tank.

Marbled hatchetfish

Carnegiella strigata

Amazon basin, Peru and Brazil · blackwater stream

Temperature: 24–28°C
pH: 5.5–7
Adult size: 1.4 in · 3.5 cm
Flow: Calm
Swims: Top
Temperament: Peaceful
Diet: Carnivore
Group: 6+
Typical price: $4–8
Rarity: Pet-store staple

Jumper. Keep a tight lid on the tank.

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Photo: SOK, CC BY-SA 4.0

Neon tetra

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Tetras · ParacheirodonStaple

20–26°C
pH 5–7
Calm
1.4 in
Mid
Mixed
Peaceful
6+ group!

Neon tetra

Paracheirodon innesi

Upper Amazon basin: Peru, Colombia, Brazil · blackwater stream

Temperature: 20–26°C
pH: 5–7
Adult size: 1.4 in · 3.5 cm
Flow: Calm
Swims: Mid-water
Temperament: Peaceful
Diet: Omnivore
Group: 6+
Typical price: $2–5
Rarity: Pet-store staple

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Photo: Holger Krisp, CC BY 3.0

Rummynose tetra

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Tetras · HemigrammusStaple

24–28°C
pH 5.5–7
Gentle
2 in
Mid
Mixed
Peaceful
8+ group!

Rummynose tetra

Hemigrammus rhodostomus

Lower Amazon and Rio Negro, Brazil · blackwater stream

Temperature: 24–28°C
pH: 5.5–7
Adult size: 2 in · 5 cm
Flow: Gentle
Swims: Mid-water
Temperament: Peaceful
Diet: Omnivore
Group: 8+
Typical price: $3–6
Rarity: Pet-store staple

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Photo: Gavinevans, CC BY-SA 3.0

Golden pencilfish

Give us a picture and get credit! ≈

Tetras · NannostomusStaple

24–28°C
pH 5.5–7.5
Calm
1.8 in
Top/mid
Mixed
Peaceful
6+ group!

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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