The gold fish can easily be identified as male and female. The lower caudal fin of gold fish is called clasper organ and is also male organ. Fe male does not have this organ. When a female gold fish is pregnant, its belly swells than normal.
Its fat?
The stomach of a female goldfish is little fatter than the male
Goldfish ARE egg layers. Females ripe with eggs do get fat. But unless you have a really big tank, (or pond) it's very doubtful any egg laying will go on. Possible, but not very likely.
Some types of goldfish are also "fat." Might you have one of those? Fan tails, ryukins, lionheads etc... To name a few. All have a very boxy shape.
Some types of goldfish are also "fat." Might you have one of those? Fan tails, ryukins, lionheads etc... To name a few. All have a very boxy shape.
I presume it will balloon!