why did my single fish have babies?it has had no other contact with any other fish

[parke]

for over a year? i have cleaned the tank several times and my single fish had babies

 

[Ryan]

without knowing what kind of fish it is its kind of hard to tell you why it had babies.

 

[Corey S]

is it like... a guppy?if so, then they can carry sperm for a while.. though idk about that long..