Michel Roggo / Goldfish (Carassius auratus) Europe

Heather Angel / Bubble eye goldfish (Carassius auratus) with upward pointing eyes and two large fluid-filled sacs.. In captivity, Shanghai Zoo, Shanghai, China.

Ernie Janes / Fantail goldfish

Ernie Janes / Fantail goldfish

Ernie Janes / Fantail goldfish

Gary K. Smith / Goldfish (Carassius auratus) in plastic bag acclimatising to an outside pond. Norfolk, England, UK, August.

MYN / Paul van Hoof / Goldfish (Carassius auratus auratus) adult, The Netherlands, June, Meetyourneighbours.net project

MYN / Niall Benvie / Goldfish (Carassius auratus) introduced species, Burgundy, France, April.

Colin Monteath / European Carp (Cyprinus carpio) group in pond, Japan

Alex Mustard / Thermal pool filled with water that remains close to 30 degrees celsius all year, and is able to support a population of fancy goldfish (Carassius auratus) despite being close to the Arctic Circle. Hu...

Cyril Ruoso / Goldfish (Carassius auratus) in an aquarium, France

Cyril Ruoso / Goldfish (Carassius auratus) tail, France

Cyril Ruoso / Goldfish (Carassius auratus) in an aquarium, France

Cyril Ruoso / Goldfish (Carassius auratus) in an aquarium, France

Cyril Ruoso / Goldfish (Carassius auratus) in an aquarium, France

Will Watson / Wild reverted form of Domestic goldfish (Carassius auratus) captive, Herefordshire, England, UK, April

Ernie Janes / Goldfish (Carassius auratus) for sale in fish market, Hong Kong, China, 2009

Michel Roggo / Prussian carp (Carassius auratus gibelio) Europe

Jane Burton / Ide / Golden orfe {Leuciscus idus} and Goldfish {Carassius auratus} in pond with Waterlilies, captive, from Europe

Jane Burton / Collection of golden fish - Golden orfe / Ide {Leuciscus idus}, Golden tench, Golden rudd {Scardinius sp}, Golden carp {Carassius sp} and Goldfish {Carssius auratus}, captive

Jane Burton / Collection of golden fish - Golden orfe / Ide {Leuciscus idus}, Golden tench, Golden rudd {Scardinius sp}, Golden carp {Carassius sp} and Goldfish {Carssius auratus}, captive

Pete Oxford / Koi is favorite ornamental fish, China

Nature Production / Goldfish {Carassius auratus} sleeping in watergrass, captive, Japan

Nature Production / Goldfish {Carassius auratus} with thread of excrement, captive, Japan

Nature Production / Goldfish {Carassius auratus} with thread of excrement, captive, Japan

Dan Burton / Calico oranda goldfish in tank (Carassius auratus) UK captive

Konrad Wothe / Goldfish (Carassius auratus) in aquarium

Konrad Wothe / Goldfish (Carassius auratus) in aquarium

Konrad Wothe / Goldfish (Carassius auratus) in aquarium

Simon Colmer / Goldfish (Carassius auratus) captive

Jane Burton / Two goldfish (Carassius auratus) with waterlilies. UK

Jane Burton / Goldfish {Carassius auratus} portrait, Captive. UK.

Jane Burton / Four Fantail goldfish {Carassius auratus}. UK.

Dave Bevan / Bubble-eyed goldfish {Carassius auratus} Captive.

Dave Bevan / Goldfish {Carassius auratus} with Fish leech {Piscicola geometra} attached to its scales, UK.

Norbert Wu / Goldfish (Carassius auratus) school in tank, California

Adrian Davies / Goldfish - feral form {Carassius auratus} Southern England, UK, Europe

Tony Evans / Goldfish {Carassius auratus} captive

Tony Evans / Goldfish {Carassius auratus} captive

Tony Evans / Goldfish {Carassius auratus} captive

Dan Burton / Red oranda goldfish {Carassius auratus} Freshwater aquarium, UK

Heidi & Hans-Juergen Koch / Goldfish (Carassius auratus) gibelio form, Goosefeld, Schleswig-Holstein, Germany

Heidi & Hans-Juergen Koch / Goldfish (Carassius auratus) gibelio form, Goosefeld, Schleswig-Holstein, Germany

Kim Taylor / Goldfish (Carassius auratus)

Yves Lanceau / Domestic tabby Cat (Felis catus) watching goldfish (Carassius auratus) in a glass bowl.