When
found


in


nature,


goldfish


are


olive

green.


Introduction


of


goldfish


into

the


wild


can

cause

problems

for
native
species.


Goldfish

can

hybridize


with


certain


other


species


of


carp.


Within


three


breeding


generations,
the

vast


majority


of


the


goldfish


spawn


revert

to


their


natural

olive

color.


The


mutation


that


gave

rise

to


the
domestic

goldfish


is


also


known


from

other


cyprinid


species,


such

as

common


carp


and

tench.


Koi


may


also
interbreed

with


the


goldfish


to


produce

a

sterile

hybrid


fish.
There
are


many


different


varieties


of


domesticated


goldfish.


Fancy


goldfish


are


unlikely


to


survive

in


the


wild
because

of


their


bright


fin

colors;


however


the


hardier

varieties


such

as

the


Shubunkin


may


survive

long
enough

to


breed

with


wild


cousins.


Common

and

comet


goldfish


can

survive,


and

even

thrive,


in


any

climate
that

can

support


a

pond.
Varieties
of


domesticated


goldfish
Selective
breeding


over


centuries

has

produced

several


color


variations,

some


of


them

far


removed


from

the
"golden"

color


of


the


originally


domesticated


fish.


There

are


also


different


body

shapes,


fin

and

eye
configurations.

Some

extreme

versions


of


the


goldfish


live


only


in


aquariums—they

are


much


less


hardy


than
varieties

closer


to


the


"wild"

original.


However,


some


variations


are


hardier,


such

as

the


Shubunkin.


The


main
varieties

are:
Common

goldfish
Black
Moor
Bubble
Eye
Common

goldfish

differ


only

in
color

from


their


ancestor,


the
Prussian
carp.


Common


goldfish
come

in

a


variety

of


colors


including
red,

orange/gold,


white,


black


and
yellow

or


'lemon'


goldfish.
The

Black


moor

is


a
telescope
-

eyed
variety
of


fancy
goldfish
that

has


a
characteristic

pair


of
protruding

eyes.


It


is
also

referred


to

as
popeye,

telescope,
kuro

demekin


in
Japan
and


dragon-

eye
in
China.
The

small,


fancy


Bubble
Eye

has


upward

pointing


eyes
accompanied
by

two

large

fluid-
filled

sacs.
Celestial

Eye
Comet
(goldfish)
Fantail

(goldfish)
Fancy

Celestial


eye

goldfish

or
Choten
gan


has


a


double


tail


and


a
breed
-

defining


pair


of


upturned,
telescope

eyes

with

pupils


gazing
skyward.
The

comet


or


comet

-
tailed
goldfish

is


the
most

common

fancy
variety
in

the


United
States.

It


is


similar

to
the

common

goldfish,
except

slightly
smaller

and


slimmer,
and

is


mainly
distinguished

by

its
long,

deeply


forked
tail.
The

Fantail


goldfish

is


the
western

form


of


the


Ryukin


and
possesses

an


egg

-

shaped

body,


a
high
dorsal


fin,


a


long

quadruple
caudal

fin,


and


no

shoulder
hump.
Lionhead
(goldfish)
Oranda
Pearlscale
The

fancy


lionhead

has


a


hood.


This
The

fancy


Oranda


is
characterized

by

a
prominent

raspberry-
like
hood

or


(also
known

as


wen


or
The
fancy

pearlscale

or

chinshurin


in
Japanese

language


is


spherical

-