A pregnant goldfish isn't technically "pregnant" as they lay eggs, but the informal, common term for a female full of eggs is a "twit," while the proper term for a female fish carrying eggs is "gravid". They release eggs (spawn) for the male to fertilize externally, rather than giving birth to live young like some other fish.
Did you know... A pregnant goldfish is called a twit.
They are born grayish black & begin changing color at around 3 months.
Fantail Goldfish: How to Identify Pregnancy Signs
Females develop a swollen belly when carrying eggs, and males may show breeding tubercles. Signs include increased hiding, chasing behavior, and spawning activity.
A pregnant goldfish is actually a female carrying eggs, appearing swollen and often chased by males. Symptoms include a rounded belly and spawning behavior. To care, provide a stress-free environment with clean, well-oxygenated water. Use a separate breeding tank if possible.
Late spring to early summer usually marks the time of year when koi and goldfish start to spawn. When koi and goldfish spawn, they produce thousands of eggs but very few actually survive and grow up into baby fish.
The eggs inside the female goldfish's body make the belly swollen. On the contrary, some female goldfish's bellies may not be swollen, although they carry eggs. If the female goldfish streams out eggs, then it means your fish is pregnant, but not bloating.
Note the size of your goldfish's body. Female goldfish are generally a bit rounder than male goldfish. When your female goldfish is about to lay eggs, the size of their belly may grow even larger, and stick out a bit.
Goldfish in the wild usually spawn during the warmer months of the year, beginning in spring. They can spawn up to once a month. However, fish kept inside in consistently warm water can do so year-round. A female goldfish can lay up to 1,000 eggs at a time.
Baby fish are called fry.
Before they are born, baby fish are called larva, typically once they have first hatched. Once they grow they become the more common fry. After this, just before they become adults, baby fish are called juveniles.
Starches from refined flour can be just as risky for cavities from snacks as overt sugars. Compared to cookies or candy, Goldfish have less added sugar, yet their sticky starch can adhere to teeth, creating an ideal environment for bacteria and plaque buildup.
Goldfish can recognize individual humans and distinguish their owners from strangers. Goldfish also have complex spatial memories, better than humans have!
Associated terms for pregnancy are gravid and parous. Gravidus and gravid come from the Latin word meaning "heavy" and a pregnant female is sometimes referred to as a gravida. Gravidity refers to the number of times that a female has been pregnant.
Goldfish have a lifespan averaging about 10 to 15 years, with some varieties living up to 30 years when provided with proper care.
Fry and fingerling are generic terms that can be applied to the juveniles of most fish species, but some groups of fishes have juvenile development stages particular to the group. This section details the stages and the particular names used for juvenile salmon.
They are never pregnant. Only mammals and a few species of fish can get pregnant. Female goldfish, being egg layers, can be said to be gravid if they are full of eggs and a gravid female goldfish may lay her eggs with or without a male to fertilize them.
An enlarged stomach and upside-down swimming in goldfish often indicate swim bladder disease or internal tumors. Symptoms include abnormal buoyancy, lethargy, and abdominal swelling. Causes range from infections, constipation, to neoplasms.
It's mating behavior , as others have pointed out. The one chasing the other is the male. Watch your female very closely for signs of stress or injuries. Males can be extremely persistent and if the female has no eggs to drop it's going to be a long-winded, unproductive session for her.
Female guppies may become less active and often settle on the bottom of the aquarium or behind plants or decorations and suddenly stop swimming in the water. This indicates they are in labour and about to give birth to fry.
When ready for mating, the gonopodium becomes erect and points forward towards the female. The male shortly inserts the organ into the sex opening of the female, with hook-like adaptations that allow the fish to grip onto the female to ensure impregnation.