/ Gold Fish
The goldfish is a freshwater fish. It is one of the most commonly kept aquarium fish.
A relatively small member of the carp family, the goldfish is native to East Asia. It was first selectively bred in ancient China more than 1,000 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).
As of April 2008, the largest goldfish in the world was believed by the BBC to measure 19 inches (48 cm), and to be living in the Netherlands.
Goldfish have one of the most studied senses of vision in fishes. Goldfish have four kinds of cone cells, which are respectively sensitive to different colours: red, green, blue and ultraviolet.
Goldfish have strong associative learning abilities, as well as social learning skills. In addition, their visual acuity allows them to distinguish between individual humans. Owners may notice that fish react favorably to them (swimming to the front of the glass, swimming rapidly around the tank, and going to the surface mouthing for food) while hiding when other people approach the tank. Over time, goldfish learn to associate their owners and other humans with food, often "begging" for food whenever their owners approach.
Goldfish that have constant visual contact with humans also stop considering them to be a threat. After being kept in a tank for several weeks, sometimes months, it becomes possible to feed a goldfish by hand without it shying away.
Goldfish have a memory-span of at least three months and can distinguish between different shapes, colors and sounds. By using positive reinforcement, goldfish can be trained to recognize and to react to light signals of different colors or to perform tricks. Fish respond to certain colors most evidently in relation to feeding. Fish learn to anticipate feedings provided they occur at around the same time every day.
Common goldfish are social animals who prefer living in groups. They are able to interact with any fish belonging to the same species. With provision of adequate care and attention, common goldfish can become tame. Once familiar with the face of its owner, swimming towards the fish keeper during feeding time can be observed, and hand-feeding becomes possible.
Goldfish can live for long periods of time if they are fed a varied diet and housed in proper water conditions. The average lifetime of a goldfish is ten to fifteen years. The longest lived goldfish on record lived to age 43. The oldest living goldfish was Tish, won by a UK family at a funfair.
What do you need to take care of a goldfish?
You should never keep a goldfish in a bowl.
Get a large enough tank
The minimum tank size for one goldfish is 76 to 115 liters. If they don't have enough space a survival mechanism can start making it so they will stop growing.
For each additional goldfish add 56 liters of water.
Goldfish will grow to match the amount of space available. Your one-inch goldfish can potentially grow to the size of your arm! But it would only likely to do that if you give it a large pond or aquarium. You are not required to grow them to their full potential.
Use a 3 stages water filter. Mechanical for removing large particles. Chemical for removing odors, discolorations, and other organics. Biological for breaking down fish waste.
Feed your fish 1-2 times daily. Only feed them what they can eat in a minute, the label on the food is not a good guideline. Be careful not to overfeed them because they can easily overeat and die. Underfeeding is always preferable to overfeeding. Remove any excess food.
Set up the aquarium first before you buy the fish. Make sure the water and overall living conditions are good for the fish. Goldfish cannot live in small temporary environments (plastic bag) for very long. An hour is fine, several hours not very good. For the bottom of the aquarium use gravel that will not get stuck in your fish's throat. Make sure your tank has some scenery and light. Goldfish are active during the day. They need light to maintain a healthy wake/sleep cycle. Never put your tank in direct sunlight. Real plants are beneficial because they help absorb some of the nitrates that accumulate in the aquarium.
Adding your goldfish to the aquarium
Before you add your fish, you'll need to make sure the environment is fish ready. Pick up a pH test kit and test the tank for the right amount of ammonia, nitrite, and nitrate levels. Best is zero ammonia, zero nitrite, and less than 20 nitrate.
Clean the aquarium
Clean the aquarium at least once every week even if it doesn't look dirty. Goldfish produce waste that even your water filter may not be entirely able to remove.
Turn off the light at night and let them get some sleep.