What female fish has a menstrual period?

What fish can live to be over 100?

I have a female beta. 3 of my fish just recently died and now there is only one really small gold fish type in a 20 gallon ta...

I'm planning on getting another dog, but this time I want a girl dog :] I've only had male dogs so I don't know how theyre me...

Is it true that female flounder mensturate? If so, how often does it happen? Are they as fertile as women?

How long do tetra fish carry there eggs for?

how can I get a male and a female beta to breed. The play with each other all the time.

female or male betta??? I have guppies and neons I love betta mayb if yours works I might try it ik females get along relle w...

Hi. I have a female betta fish who has a big belly, a horizontal stripe on both sides which is grey in colour. She has a lit...

how old is a female puppy when she starts her first menstrual cycle

Hi, I´ve had a few problems with fish compatability, I had a male gourami that kept attacking his partner, so I took him to a...