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The easiest way to tell the difference is that the males may get what are called breeding stars on their gill plates during breeding season. The breeding stars look like small white bumps.
This is not always the case though, and sometimes the only way you know is by seeing the female drop eggs, or the male fertilizing the eggs.

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11y ago
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12y ago

Sexual dimorphism in goldfish can be hard to detect. Typically one cannot determine a goldfish's sex unless it is sexually mature and conditioned to breed. During the mating season, females will grow larger and become swollen with eggs. Males will develop white bumps on their gills and pectoral fins called "tubercles" or, colloquially, "breeding stars." Their colors will also usually identify while courting a female.

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5y ago

== == A Female Goldfish has a bigger V in there tail fin and a male Goldfish has a smaller V in the tail fin. Sexing Goldfish outside of the breeding season is extremely difficult. In the breeding season males develop small white pimples (breeding tubercles) on their gill covers and along the edge of their front fins (pectoral fins). Females are generally more rounded and deeper in body shape as they fill with roe (eggs) and have a larger vent before the anal fin.
In breeding season the males develop small white spots on their gill plates and the females get a bit chubby around the tummy.
Male's have long tails and females have short same way with betta's

No, not that. Females can have long tails. You can tell males because they are quick and hyper while the females tend to be calm and relaxing. Also, one side of the females belly is larger. That's another way you can tell.
Firstly, sexing young and juvenile goldfish is virtually impossible, you have to wait until the fish reach breeding age (usually one year old). Secondly, sexing adult goldfish out of the breeding season is difficult, because the sexually distinguishing features only develop during the breeding season (in the spring time). That said, females may be deeper in the body than males. == During the breeding season, the following physical features develop: * males develop breeding tubercles (white pimples) on the gill covers and on the leading edge of the pectoral fins * females develop a deeper body as they fill with roe (eggs), and have a larger vent (just before the anal fin) than the males

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15y ago

== == Sexing Goldfish outside of the breeding season is extremely difficult. In the breeding season males develop small white pimples (breeding tubercles) on their gill covers and along the edge of their front fins (pectoral fins). Females are generally more rounded and deeper in body shape as they fill with roe (eggs) and have a larger vent before the anal fin.

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5y ago

Sexing young goldfish can be difficult, but not impossible. It will depend on whether you buy an adult fish or very small young fish. If you get young fish (highly recommended) you have to wait until the fish reaches breeding age, which is about a year old.

Goldfish kept in outdoor ponds reach breeding condition about once a year (every spring - during the warmer months). Goldfish kept in indoor aquariums may come into breeding condition at any time, depending on foods and how warm their water is kept. Here are some ways you may be able to tell if you have a female or a male goldfish: * The female will generally have a fuller abdomen. If you view the fish from above the aquarium, the female will be fatter on one side of her body than the other. (A male fish tends to have a more even shape when viewed from above). * If you look closely, the male goldfish will develop tiny tubicules (Little white dots that look like tiny pimples) on the gill covers, and along the front edge of the front fins.

You will have to look carefully though - and please keep in mind that some male fish may display these signs, whilst others do not. In which case, the chasing usually gives them away! Males always chase females around the aquarium most of the time. So the chaser is nearly always male, and the one being chased is usually female.
look by the tail an it has a pronounce v so u can tell if a gols fish ia a male or a female.
Trying to tell the difference between male & female goldfish is actually quite difficult for most. The best way to tell is during breeding season, a male will get breeding stars on it's gill plates which look like small white bumps.
The easiest way to tell the difference is that the males may get what are called breeding stars on their gill plates during breeding season. The breeding stars look like small white bumps.
This is not always the case though, and sometimes the only way you know is by seeing the female drop eggs, or the male fertilizing the eggs.
The male goldfish develops tiny white spots on his gill plates when he is in breeding condition, the female gets a chubby mid section.
When boy goldfish want to mate, they get white spots on their tail. If your goldfish has a spotty tail, it's definitely a male. If it doesn't, it's a girl or a boy who's just not ready yet. If your goldfish is completely covered in white spots, it is not a show of boyishness but is actually ich, a disease caused by a parasite. Most of the bigger pet stores sell medicine for ich.

To sex goldfish you must wait until breeding age (over one year) and breeding season. The male will develop tubercles on the gill covers. These are small white bumps. The females stomach area will enlarge as she fills with eggs. Also, the female will have a slightly larger and protruding vent (anal opening).And they will also look lopsided
Check for a penis.

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14y ago

Female goldfish are slightly larger than their male counterparts, and have a heavier looking abdomen when they are about to produce eggs.

The males have small white spots on their gills and their pectoral (top) fin, which are called breeding tubercle's and are present during the breeding season. The pectoral is also longer and firmer in the males, as are the front underside fins (fin rays) which are rounder in females.

The area between the pelvic (bottom) fins and their anal passage is firmer in males than in females.

There is a ridge that runs along the underneath of them. In females this will be either missing or smaller.

Basically - unless it is breeding season - it is hard to distinguish without looking closely and referencing pictures of males and females.

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15y ago

Sexing Goldfish outside of the breeding season is extremely difficult. In the breeding season males develop small white pimples (breeding tubercles) on their gill covers and along the edge of their front fins (pectoral fins). Females are generally more rounded and deeper in body shape as they fill with roe (eggs) and have a larger vent before the anal fin.

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5y ago

It is very difficult, but in general,you can tell when spawning (egg-laying) time approaches.

Males get white pimples or spots on their gills, side fins and head. The females tummy will get unevenly swollen with eggs-but our goldfish have fat tummies all the time!

Females may be plumper and males in breeding condition develop little bumps over their heads known as tubercles.

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13y ago

Females will have more of a V in there tail than a male will.

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12y ago

if its a boy it has a fin in the bottom going from the stomach to the tail if it is a girl look if it has two fins sticking out from the bottom one to the side and the other to the side

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Q: How do you tell a female goldfish from a male goldfish?
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