A goldfish's gender will be very hard to determine before the goldfish is three years old. After this point, the male will develop little white pimple-looking things on his gills. These are called breeding stars. A female's fins will be more rounded and her tail will be convex.
There is no way to tell.
a boy has a thinner body a girl has a fatter bodya boy has little white spots on it's fin and a girl dosn't
Could be a boy or a girl ....
the girl is bigger
About at 7 to 8 weeks-DANIELLE LANDRY
the gold fish is a boy if both its sides are the same size, but if the fish is a girl one side will be bigger than the other (it looks pregnant on one side of its body) And also sometimes girls are pregnant.
Usually if your goldfish is a boy it will chase the girl around..also it will be more narrow if you look at it from the top and the girl will be fatter (due to pregnancy). Another way to tell is the fin. If the fin is more of a wave it is a girl; if the fin is more of a spike then your fish is a boy. Hope this helps!
sorry but there is really know possible way to know i am a professinal vet soo...... ya
how do i tell if my my turtle is a girl or a boy?...
you cannot tell if the caterpillar is boy or girl
its harder for a boy to tell if a girl likes him
YOu can not tell the difference between a girl or boy starfish.