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Goldfish
(Gold Fish)

Two gold fish and one kissing fish

Two goldfish and one kissing fish

 
 

Scientific Name
Carassius auratus
Type Cyprinids
Family
Cyprinidae
Subfamily
Cyprininae
Other Names
Gold Fish
Minimum Tank Size

Small Goldfish: 10 gallons
Large Goldfish: 40 gallons

Tank Level
Mid-dweller, but does visit all levels.
Care
Easy
Behavior
Peaceful schooling fish. Messy, produces a lot of waste. Should have some type of extra aeration, as they have high oxygen requirements. Makes a great bottom scavenger. May up-root plants.
Compatibility Gets along well with other non-aggressive fish. Does best with other goldfish, but can live with other peaceful fish species. Goldfish put off a lot of ammonia. While goldfish can handle a higher level of ammonia, this level can kill other types of fish and must be taken out of the water. If you are going to keep goldfish with other fish species, be sure to monitor your ammonia levels. Goldfish do not like ammonia and prefer a clean, filtered tank. Great social, community fish, however, since they prefer colder temperatures, they do best with other goldfish that can also live in these cooler temps.
Life Span
20 years
Size
Adults can reach up to 23 inches (59 cm).
Aquarium
Likes to eat live plants, so fake plants are ideal if you do not want your plants eaten. Gentle circulation. While they can live in a small bowl they do best with a larger aquarium with a filter system. They do not need a heater in an indoor aquarium.
Water Chemistry
Freshwater
pH
6.0 - 8.0
Hardness
dH: 5 - 19 (soft to hard)
Temperature
Considered a cold-water fish. Ideally they like 50° - 70° F (10° - 21° C). A goldfish can live in waters just above freezing. There are many goldfish that live in outside ponds, and so long as the water does not freeze, they can survive the winter. They do not particularly like tropical temperatures, and will not be as healthy, but they can survive.
Feeding
Omnivore (animals that eat both meat and vegetables). Flake foods (green flakes), Does best on a special goldfish diet, which can be purchased at your local pet store. They do not tolerate tropical fish food very well, as they do not have stomachs. Their food is absorbed as it travels through their intestines. Goldfish food has a higher alkaline content than tropical fish food. Feed flake foods every day and give brine shrimp (either live or frozen), tubifex worms, blood worms and daphnia only as a treat. Freeze-dried foods are recommended over live foods to avoid introducing bacteria and parasites into the tank.
Sexing

During the breeding season males develop white pimple-like bumps called breeding tubercles on their gill covers and on the leading edge of the pectoral fins. These are used for stimulating the female to release her eggs. Pregnant females develop a deeper body when they are full of eggs (roe), and they also have a larger vent, located right before the anal fin.

Breeding
Egg layer
Origin
China, parts of Siberia
Extras
The most common cause of death in goldfish is overfeeding. Their colors depend on the environment they are raised. For example, pond and river goldfish are usually duller in color than the goldfish raised in a bright fish tank.
   
   

Goldfish and a Pleco, which is an Algae Eater

Three goldfish and a pleco, which is an algae eater. The pleco is the black fish on the bottom of the tank.

 

 

List of Freshwater Aquarium Fish

List of Saltwater Aquarium Fish

Setting up a Freshwater Fish Tank

Aquarium Plants

Fish Health and Diseases

Aquarium Fish Main

 

     

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