sorry but there is really know possible way to know i am a professinal vet soo...... ya
There is no way to tell.
If it is a fantail betta, the boy will have very large, flowing fins. If it is a girl, the fins will be short and not very fancy.
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
They can only be sexed by observation during breeding season. At that time the males develop whitish spots on their gill plates and pectoral fins.
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!
how do i tell if my my turtle is a girl or a boy?...
you cannot tell if the caterpillar is boy or girl
can you tell if a fish is a boy or girl by the tail