completely

(or


nearly)

covered

with


very


large


scales


that


resemble

plates

of


armor.


Kagami

-

goi,


Mirror
carp.
Differences

from

Goldfish
Goldfish
were

developed

in


China

more


than


a

thousand

years


ago

by

selective


breeding


Prussian


carp


for
color

mutations.


By

the


Song


Dynasty

(960



1279),


yellow,

orange,


white


and

red

-

and-

white


coloration


had
been

developed.


Goldfish

(

Carassius


auratus

)


and

Prussian


carp


(

Carassius


gibelio

)


are


now


considered
different

species.


Goldfish

were

introduced

to


Japan


in


the


16th


century


and

to


Europe


in


the


17th


century.
Koi,

on

the


other


hand,


were

developed

from

common


carp


in


Japan


in


the


1820s.


Koi


are


domesticated
common

carp


(

Cyprinus


carpio

)


that


are


culled

for


color,


they


are


not


a

different


species


and

will


revert

to


the
original

coloration


within

a

few

generations


if

allowed


to


breed

freely.
In

general,


goldfish


tend


to


be

smaller


than


Koi,


and

have

a

greater


variety


of


body

shapes,


and

fin

and

tail
configurations.

Koi


varieties


tend


to


have

a

common


body

shape,


but


have

a

greater


variety


of


coloration


and
color

patterns.


They


also


have

prominent


barbels


on

the


lip.


Some

goldfish


varieties,


such

as

the


common
goldfish,

comet


goldfish


and

shubunkin

have

body

shapes


and

coloration


that


are


similar


to


Koi,


and

can

be
difficult

to


tell


apart


from

Koi


when


immature.


Since


goldfish


and

Koi


were

developed

from

different


species


of
carp,

even

though

they


can

interbreed,


their


offspring


are


sterile.
Gold
Fish
The

goldfish


(

Carassius


auratus


auratus

)


is


a

freshwater


fish

in


the


Family


of


Cypriniformes.


It

was


one

of


the
earliest

fish

to


be

domesticated,


and

is


one

of


the


most


commonly

kept


aquarium

fish.
A
relatively


small


member


of


the


carp


family

(which


also


includes

the


Koi


and

the


crucian


carp),

the


goldfish


is
a
domesticated


version


of


a

less

-

colorful


carp


(

Carassius


auratus

)


native

to


east


Asia.


It

was


first
domesticated

in


China

more


than


a

thousand

years


ago,


and

several


distinct


breeds

have

since


been
developed.

Goldfish

breeds

vary


greatly


in


size,

body

shape,


fin

configuration


and

coloration


(various
combinations

of


white,


yellow,

orange,


red,


brown,


and

black


are


known).
Related

species
Goldfish
were

bred


from

Prussian


carp


(

Carassius
auratus

gibelio

)


in


China,


and

they


remain

the
closest

wild


relative


of


the


goldfish.


Previously,
some

sources


claimed


the


Crucian


carp


(

Carassius
carassius
)


as

the


wild


version


of


the


goldfish.
However,

they


are


differentiated


by

several


characteristics.


C.

auratus


have

a

more


pointed


snout


while


the
snout

of


aC.

carassius


is


well


rounded.


C.

gibelio


often


has

a

grey/greenish

color,


while


crucian


carps


are
always
golden


bronze.


Juvenile

crucian


carp


have

a

black


spot


on

the


base

of


the


tail


which

disappears


with
age.

In


C.

auratus


this

tail


spot


is


never


present.


C.

auratus


have

fewer


than


31

scales


along


the


lateral


line
while

crucian


carp


have

33

scales


or


more.