Fish A–Z
Freshwater and marine favourites — what they look like and what they need
Freshwater · 6-7 cm · Semi-aggressive
Labyrinth fish from Thailand; males flare vivid fins and must be kept alone.
Photo: Nippyfish · CC BY 2.0
Freshwater · 3-6 cm · Community
Hardy livebearer; males show colorful tails and they breed readily in aquariums.
Photo: Holger Krisp · CC BY 3.0
Freshwater · 3-4 cm · Community
Tiny Amazon fish with a glowing blue-and-red stripe; best kept in schools.
Photo: Holger Krisp · CC BY 3.0
Freshwater · up to 15 cm · Semi-aggressive
Tall, triangular South American cichlid from the Amazon; peaceful but territorial when breeding.
Photo: Rjcastillo · CC BY 4.0
Freshwater · 15-30 cm · Peaceful
Domesticated East Asian carp kept for centuries; can outgrow small bowls considerably.
Photo: James St. John · CC BY 2.0
Freshwater · 6-12 cm · Community
Adaptable livebearer tolerating fresh and brackish water; popular black and orange varieties.
Photo: Hugo Torres · CC BY 2.5 es
Freshwater · 15-20 cm · Peaceful
Round, disc-shaped Amazon cichlid prized by hobbyists but sensitive to water quality.
Photo: Doronenko · CC BY 3.0
Freshwater · 25-35 cm · Aggressive
Large, intelligent South American cichlid that recognizes owners and needs a big tank.
Photo: Jón Helgi Jónsson ( Amything ) · CC BY-SA 3.0
Marine · 8-11 cm · Semi-aggressive
Orange-and-white reef fish that shelters unharmed among the stinging tentacles of sea anemones.
Photo: Nick Hobgood · CC BY-SA 3.0
Marine · 25-30 cm · Semi-aggressive
Bright blue reef surgeonfish with a scalpel-like spine near its yellow tail.
Photo: Holger Krisp · CC BY 3.0
Marine · 6-8 cm · Peaceful
Small, vividly patterned reef dragonet from the Pacific; famously hard to feed.
Photo: Luc Viatour · CC BY-SA 3.0
Freshwater · 60-90 cm · Peaceful
Ornamental carp bred in Japan for pond keeping; can live for decades.
Photo: Eistreter · CC BY-SA 3.0
Keep exploring
Freshwater and marine favourites — what they look like and what they need — browse the full picture A–Z, search any name, and see care notes for the popular fish.