goldfish-in-oceanThe common goldfish are among the most attractive fishes and are loved by children. Its breed belongs to the Prussian carp (a type of fish). It is popularly kept in aquariums. It is a fresh-water fish and is native to Asia. Its selective breeding is known to take place in ancient China about 1,000 years ago.

What Do They Look Like?

goldfishGoldfish have more than a hundred varieties. Therefore, there is a great variation in their color, sizes, and shapes. The colors may include red, orange, red/white, white/black, yellow/white, blue, grey/brown, olive green, yellow, white, and black. Sometimes, the brightness, and sharpness of its colors may indicate the health of goldfish.

They have two sets of paired fins which are called the pectoral fins and the pelvic fins. In addition to these paired-fins, they also possess three single fins known as the dorsal (upper side), the caudal (at or near the tail), and the anal (position posterior to anus) fin. They have considerably large eyes which make them quite beautiful. The head of a goldfish has no scales, i.e. scales are the smaller plates on the skin of most fishes. Most of the goldfish species are very attractive due to their eye-catching colors and shape of the body and fins.

Habitat

goldfish-in-groupIn the non-domesticated wild environments, goldfish dwell in less turbulent (vibrating) waters. They are closely related to carps (a type of fish). Therefore, they prefer somewhat murky waters for their habitat. Even in aquariums, they love to live along with plants and a sort of muddy bottom. Regular cleaning of the aquariums is necessary so that goldfish can live healthily. Also, the alive plants in aquariums also need replacements at suitable intervals of time.

Goldfish can survive in temperatures of water from near freezing to 30 °C. Moreover, the environments that are slightly acidic (pH = 6.5) to mildly alkaline (pH up to 8.5) are ideal for them.

Diet

Most of the goldfish species are omnivores; eat both animal and plant material. They eat various plant materials, insects, for example, larvae of mosquitoes. They eat continuously and sometimes they eat too much than their regular diet. Over-eating results in many complications that affect their health. Unlike conventional fish-food, their diet contains lesser proteins and more of carbohydrates.

In the non-domesticated wild environments, goldfish are found to be omnivores. They eat plants, insects such as mosquito larvae, small crustaceans (such as small lobsters, shrimps), zooplanktons (small animals or their structure), dead plants, and animal matter.

In the aquariums, goldfish are provided food such as dried flakes or pellet foods. And as a good food-supplements, they are given dried Tubifex worms, daphnia (smaller freshwater crustaceans), brine shrimp, and plant materials such as boiled peas and lettuces.

Reproduction

Female goldfish lay eggs that are sticky and attach themselves to underwater plants. After that, the male goldfish fertilizes them. The hatching period for the eggs is around 48 to 72 hours after which sizeable off-springs are released. More or less in a week’s time, their appearance begins to resemble that of a goldfish in shape. But the development of typical colors may take as long as a year. During the first few weeks, the growth rate of newly released fry (babies of goldfish) is pretty high. They need the appropriate environment and suitable food in good-quantity to maintain their health and mating activities.

Conservation Status

They are not facing the danger of extinction.

Fun Facts

  • It was believed that goldfish can only remember the information of the past 3 seconds. But recently scientists have found that goldfish can remember events of the past 3 months.
  • Goldfish don’t have any eyelids and their eyes are always open – even during sleep.
  • Goldfish eyes can see also see an ultraviolet color other than red, yellow, and blue. But human eyes can only sense 3 colors which are red, yellow, and blue.

Cite this Page

Abdul Wahab, "Goldfish," in Science4Fun, September 11, 2020, https://science4fun.info/goldfish/.