Save the Little Fish

Saving the world’s tropical fish, one tank at a time.

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.

The fishes 34 fish · new every day

Ember tetra

Ember tetra ≈

Tetras · HyphessobryconStaple

  • 23–29°C
  • pH 5.5–7
  • Calm
  • 0.8 in
  • Mid
  • Mixed
  • Peaceful
  • 8+ group!
Rio Araguaia basin, Brazil

Ember tetra

Hyphessobrycon amandae

Rio Araguaia basin, Brazil · river

Temperature
23–29°C
pH
5.5–7
Adult size
0.8 in · 2 cm
Flow
Calm
Swims
Mid-water
Temperament
Peaceful
Diet
Omnivore
Group
8+
Typical price
$3–5
Rarity
Pet-store staple

Photo: Cedricguppy - Loury Cédric, CC BY-SA 4.0

Sparkling gourami

Sparkling gourami ≈

Gouramis & bettas · TrichopsisStaple

  • 24–28°C
  • pH 6–7.5
  • Calm
  • 1.6 in
  • Top/mid
  • Meat
  • Peaceful
  • 4+ group
Rice paddies and ditches of Southeast Asia

Sparkling gourami

Trichopsis pumila

Rice paddies and ditches of Southeast Asia · swamp or paddy

Temperature
24–28°C
pH
6–7.5
Adult size
1.6 in · 4 cm
Flow
Calm
Swims
Top and mid-water
Temperament
Peaceful
Diet
Carnivore
Group
4+
Typical price
$4–8
Rarity
Pet-store staple

Photo: Zikamoi, CC BY-SA 3.0

Betta (Siamese fighting fish)

Betta (Siamese fighting fish) ≈

Gouramis & bettas · Betta

  • 24–30°C
  • pH 6–7.5
  • Calm
  • 2.6 in
  • Top/mid
  • Meat
  • Semi-agg.!

Lone male. Males fight. Keep one, or give each his own space.

Rice paddies and marshes of Thailand

Betta (Siamese fighting fish)

Betta splendens

Rice paddies and marshes of Thailand · swamp or paddy

Temperature
24–30°C
pH
6–7.5
Adult size
2.6 in · 6.5 cm
Flow
Calm
Swims
Top and mid-water
Temperament
Semi-aggressive
Diet
Carnivore
Group
1+
Typical price
$8–40

Lone male. Males fight. Keep one, or give each his own space.

Long fins. Fin nippers will pick on it.

Photo: ErgoSum88, Public domain

Molly

Molly ≈

Livebearers · PoeciliaStaple

  • 22–28°C
  • pH 7.5–8.5!
  • Calm
  • 3 in
  • Mid/top
  • Mixed
  • Peaceful
  • 3+ group
Coastal rivers, Mexico to Colombia

Molly

Poecilia sphenops

Coastal rivers, Mexico to Colombia · brackish estuary

Temperature
22–28°C
pH
7.5–8.5
Adult size
3 in · 8 cm
Flow
Calm
Swims
Mid-water and top
Temperament
Peaceful
Diet
Omnivore
Group
3+
Typical price
$3–7
Rarity
Pet-store staple

Photo: Dnoerholm, CC BY-SA 4.0

Celestial pearl danio

Celestial pearl danio ≈

Rasboras & danios · DanioStaple

  • 20–26°C
  • pH 6.5–7.5
  • Calm
  • 1 in
  • Mid/bottom
  • Mixed
  • Peaceful
  • 6+ group!
Spring-fed ponds, Shan Plateau, Myanmar

Celestial pearl danio

Danio margaritatus

Spring-fed ponds, Shan Plateau, Myanmar · pond

Temperature
20–26°C
pH
6.5–7.5
Adult size
1 in · 2.5 cm
Flow
Calm
Swims
Mid-water and bottom
Temperament
Peaceful
Diet
Omnivore
Group
6+
Typical price
$4–7
Rarity
Pet-store staple

Photo: Cisamarc, CC BY-SA 3.0

Cherry barb

Cherry barb ≈

Barbs · PuntiusStaple

  • 23–27°C
  • pH 6–7.5
  • Calm
  • 2 in
  • Mid/bottom
  • Mixed
  • Peaceful
  • 6+ group!
Shaded forest streams, Sri Lanka

Cherry barb

Puntius titteya

Shaded forest streams, Sri Lanka · stream

Temperature
23–27°C
pH
6–7.5
Adult size
2 in · 5 cm
Flow
Calm
Swims
Mid-water and bottom
Temperament
Peaceful
Diet
Omnivore
Group
6+
Typical price
$3–5
Rarity
Pet-store staple

Photo: NasserHalaweh, CC BY-SA 4.0

Honey gourami

Honey gourami ≈

Gouramis & bettas · TrichogasterStaple

  • 22–28°C
  • pH 6–7.5
  • Calm
  • 2 in
  • Top/mid
  • Mixed
  • Peaceful
  • 2+ group
Ponds and ditches of India and Bangladesh

Honey gourami

Trichogaster chuna

Ponds and ditches of India and Bangladesh · pond

Temperature
22–28°C
pH
6–7.5
Adult size
2 in · 5 cm
Flow
Calm
Swims
Top and mid-water
Temperament
Peaceful
Diet
Omnivore
Group
2+
Typical price
$5–9
Rarity
Pet-store staple

Photo: Vincent Lim Show Chen, CC BY-SA 2.0

Dwarf gourami

Dwarf gourami ≈

Gouramis & bettas · Trichogaster

  • 24–28°C
  • pH 6–7.5
  • Calm
  • 2.8 in
  • Top/mid
  • Mixed
  • Peaceful

Lone male. Males fight. Keep one, or give each his own space.

Slow, plant-choked waters of India and Bangladesh

Dwarf gourami

Trichogaster lalius

Slow, plant-choked waters of India and Bangladesh · swamp or paddy

Temperature
24–28°C
pH
6–7.5
Adult size
2.8 in · 7 cm
Flow
Calm
Swims
Top and mid-water
Temperament
Peaceful
Diet
Omnivore
Group
1+
Typical price
$6–12

Lone male. Males fight. Keep one, or give each his own space.

Photo: Kennyannydenny, CC BY-SA 3.0

Oscar

Oscar ≈

Cichlids · Astronotus

  • 22–28°C
  • pH 6–7.5
  • Calm
  • 13 in!
  • Mid/bottom
  • Meat
  • Aggressive!

Predator. Eats any fish that fits in its mouth.

Slow rivers and floodplains of the Amazon

Oscar

Astronotus ocellatus

Slow rivers and floodplains of the Amazon · flooded forest

Temperature
22–28°C
pH
6–7.5
Adult size
13 in · 33 cm
Flow
Calm
Swims
Mid-water and bottom
Temperament
Aggressive
Diet
Carnivore
Group
1+
Typical price
$15–40

Predator. Eats any fish that fits in its mouth.

Photo: Jón Helgi Jónsson (Amything), CC BY-SA 3.0

Chili rasbora

Chili rasbora ≈

Rasboras & danios · BorarasStaple

  • 20–28°C
  • pH 4–7
  • Calm
  • 0.8 in
  • Mid
  • Mixed
  • Peaceful
  • 8+ group!
Peat swamps of southwest Borneo

Chili rasbora

Boraras brigittae

Peat swamps of southwest Borneo · swamp or paddy

Temperature
20–28°C
pH
4–7
Adult size
0.8 in · 2 cm
Flow
Calm
Swims
Mid-water
Temperament
Peaceful
Diet
Omnivore
Group
8+
Typical price
$3–5
Rarity
Pet-store staple

Photo: Daiju Azuma, CC BY-SA 4.0

Cardinal tetra

Cardinal tetra ≈

Tetras · ParacheirodonStaple

  • 23–29°C
  • pH 4.5–7
  • Calm
  • 1.6 in
  • Mid
  • Mixed
  • Peaceful
  • 6+ group!
Rio Negro and upper Orinoco, Brazil and Venezuela

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

Photo: Paolo Neo, Public domain

Marbled hatchetfish

Marbled hatchetfish ≈

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.

Amazon basin, Peru and Brazil

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.

Photo: SOK, CC BY-SA 4.0

Kuhli loach

Kuhli loach ≈

Loaches · PangioStaple

  • 24–29°C
  • pH 5.5–7
  • Calm
  • 4 in
  • Bottom
  • Mixed
  • Peaceful
  • 5+ group
Peat swamp streams of Malaysia and Indonesia

Kuhli loach

Pangio kuhlii

Peat swamp streams of Malaysia and Indonesia · swamp or paddy

Temperature
24–29°C
pH
5.5–7
Adult size
4 in · 9 cm
Flow
Calm
Swims
Bottom
Temperament
Peaceful
Diet
Omnivore
Group
5+
Typical price
$4–8
Rarity
Pet-store staple

Photo: Robert Mollik, CC BY-SA 4.0

Harlequin rasbora

Harlequin rasbora ≈

Rasboras & danios · TrigonostigmaStaple

  • 22–28°C
  • pH 5–7.5
  • Calm
  • 1.8 in
  • Mid
  • Mixed
  • Peaceful
  • 8+ group!
Peat swamp streams, Malay Peninsula and Sumatra

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

Photo: NasserHalaweh, CC BY-SA 4.0

Angelfish

Angelfish ≈

Cichlids · Pterophyllum

  • 24–30°C
  • pH 6–7.5
  • Calm
  • 6 in
  • Mid
  • Mixed
  • Semi-agg.!

Predator. Eats any fish that fits in its mouth.

Flooded forests of the Amazon basin

Angelfish

Pterophyllum scalare

Flooded forests of the Amazon basin · flooded forest

Temperature
24–30°C
pH
6–7.5
Adult size
6 in · 15 cm
Flow
Calm
Swims
Mid-water
Temperament
Semi-aggressive
Diet
Omnivore
Group
1+
Typical price
$8–30

Predator. Eats any fish that fits in its mouth.

Long fins. Fin nippers will pick on it.

Photo: Rjcastillo, CC BY 4.0

Red lizard whiptail

L010a
Red lizard whiptail ≈

Plecos · RineloricariaStaple

  • 22–27°C
  • pH 5.5–7.5
  • Calm
  • 5 in
  • Bottom
  • Mixed
  • Peaceful

Lays eggs in the open, and the male guards them where you can watch.

Aquarium-bred colour strain

Red lizard whiptail

L010a

Aquarium-bred colour strain · river

Temperature
22–27°C
pH
5.5–7.5
Adult size
5 in · 12 cm
Flow
Calm
Swims
Bottom
Temperament
Peaceful
Diet
Omnivore
Breeding
Easy
Typical price
$10–25
In Canada
Common
Rarity
Pet-store staple

Lays eggs in the open, and the male guards them where you can watch. Prefers cooler water.

Photo: Kaden Slone, CC BY 4.0

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