Some fish can temporarily change their gender. For example, let's say the mother fish died after giving birth. Then most likely the father can change gender to care for the offspring. Remember this can only happen to a few types of fish therefore if your tlkin bout a goldfish then you'll have to lok at it's structure because it probably cnt change gender.
It depends on the kind of fish. If its a really small one it may take a pro to find out. But some kinds of fish have differences in them like size and color, while others are almost exactly the same. I guess you could wait a while and see which ones turn out pregnant :D
i thought female fish could fuse with males and then be able to reproduce with herself. and i thought that was just with angler-fish... Fish are a bunch of sexual deviants..
LOL! It is weird but it's true Half my class were so interested in this but I juss didn't want to hear it lol!
Lol idk u juss learned this in my school you may be smarter than me though so idk.
That's just plain gross if you ask me... D:
EEhhh.... thats just weird D: