Goldfish is a playful fish and benefit from the exercise

They are intelligent and will recognize the person who feeds them

Types of Goldfish: "Common" These are normally shaped fish. They can grow to be 12 inches and live 20+ yrs if cared for properly. They are often sold in petstores as "feeder fish". They have short finnage and are most commonly found in the "orange" color. They can be red and white, brownish green, or green.; "Fantail" They are usually a shorter fish with double tails and more round bodied. If they have long fins they are named veiltails. They are a well-liked double-tail found in many petstores. They have a head that is more pointed and have no head growth. Their fins tend to be more size proportioned to their bodies.; "Comet" These are more like the common goldfish but with longer fins and skinnier bodies. They have a more slender look than the common goldfish.; "Ranchu" These fish do not have a dorsal fin but do have head growth. They are not long and slender but more circular in shape. The curve of their back is more noticeable than that of the lionhead.; "Lionhead" Another double-tailed fish with no dorsal fin. It has a short rectangular shape. They can have headgrowth as big as they are.; "Black Moor" These fish are double-tailed and have telescope eyes.; "Celestial" This goldfish has a double-tail without a dorsal fin. They body is cigar shaped. The eyes look upward.; "Oranda" A lionhead with a dorsal fin and head growth. They are most commonly white in color with a red cap (red-capped oranda).; "Shubunkin" These fish are more long bodied and best known for their white bodies and spots of color in shades of yellow, orange, blue and black. They are calico colored and have either comet shapes or shapes similar to the common goldfish.; "Pompoms" Small growths called pompoms grow near their nostrils and are about the size of a pea. These fish are a variety of colors. These fish are dorsal-less with a lionhead body and no head growth.; "Telescope eyed" These fish come in a variety of shapes; however, they have large eyes that stick out similar to a telescope. They are double-tailed and have a short round body. These fish seem notorious for changing colors from black to orange.; "Pearl Scale" They have a fatter shape with a bulging middle and their scales look as though a white pearl is beneath each one. They are shaped similar to a ball. They have double-tails and if they have head growth they are called Hamanishiki.; "Ryukin" These little guys are round bodied and have a humped back. They have double-tails. They store fat in their humps and head growth. Some older Ryukins will have head growth.; "Bubble eyed" They have bubble sacs under each eye. The bubbles are either "boxer glove" shaped as the eyes are attached to the fish's head whereas the second shape is nearly round and the eyes appear to be looking upward or floating on the bubble. They can be various colors. They usually are without a dorsal fin. Their body is similar in shape to a cigar. They have double fins in proportion to their bodies; http://www.goldfishinfo.com/variet.htm

The goldfish, Carassius auratus, was one of the earliest fish to be domesticated...

...and is still one of the most commonly kept aquarium fish and water gardens. During the Tang Dynasty, it was popular to raise carp in ponds. As the result of a dominant genetic mutation, one of these carp displayed gold (actually yellowish orange) rather than silver coloration. People began to breed the gold variety instead of the silver variety, and began to display them in small containers. Selective breeding over centuries has produced several color variations, some of them far removed from the "golden" color of the originally domesticated fish.
http://en.wikipedia.org/wiki/Goldfish

The golden rule for good goldfish care!

Quarantine all new Goldfish you add to your Goldfish Pond and Goldfish Aquarium and treat ALL new Plants. - Follow these five simple steps for proper Goldfish Care and reduce Goldfish Disease: # 1 - Quarantine Goldfish Aquarium must be aged or have an aged filter - # 2- Salt Goldfish Aquarium to, point 3 %, one tablespoon per gallon - # 3 - Treat for flukes with Prazi-Pro or our Aqua Prazi - # 4 - Look for anchor worm and fish lice, if found, treat Goldfish with Dimlin - # 5 - Feed Medi-Gold to ALL new goldfish for two weeks to treat for any bacterial problems. You break this Golden Rule and your Goldfish could pay with their life! Quarantine is a MUST....
http://www.goldfishconnection.com/articles/details.php?articleId=124&parentId=10

Goldfish are quite intelligent and will recognize the person who feeds them

They will show they know you by swimming rapidly back and forth when you are near the tank or splashing. Goldfish like to play and benefit from the exercise, so having two fish is better than one. However, if your tank is not big enough to house more than one, your fish will still live happily, and in better health than if you crowded it. There are several varieties of goldfish; however, they all stem from the original stocks developed by Chinese, Korean, and Japanese breeders. When you begin your aquarium, you need to keep in mind that it is a home for your fish. Goldfish require more room than other varieties of fish...
http://www.goldfishinfo.com/

Natural selection would never allow most goldfish varieties to survive

Only through the endeavours of man and the attendant protective care, isolated away from predation, adequately fed, and cosseted with conditioned water, have they been continuously developed since about 400 AD. It is said to have all started when Chinese breeders of Carassius auratus as food fish found some specimens displaying coloured markings. Selective breeding produced self-coloured fish which were kept as pets, and commonly so by about 1200 AD. Some 400 years later body variations were developing, followed shortly by finnage development. Specimens taken to Japan formed the basis of an accelerated programme to develop yet more varieties of fancy goldfish...
http://www.thegoldfishbowl.co.uk/

The Telescope Goldfish derives its name form its large and protruding eyes

The Telescope Goldfish is known by several other names as well, such as Globe Eye Goldfish, Dragon Eye Goldfish and the Japanese word Demekin. There are three acceptable eye-shapes for the Telescope Goldfish. The dome shaped eye, the flat eye and the simple, round eye. The round eyes can be found in various degrees of attachment to the head of the fish. Some Telescope Goldfish have round eyes that look like they are about to float away from the fish, while others have more than half of the eye attached to the head. The dome shaped eyes are wider at the base of the eye and becomes narrower at the top. Just like the name suggest, flat eyes are somewhat flattened at the top. Regardless of the shape of the eyes, they should always be equal in size and protrude outwards.
http://www.aquaticcommunity.com/goldfish/telescope.php

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