Spawning Guppies

Orion-

Are guppies viviparous or ovoviviparous? I thought that viviparous referred to things like placental mammals, where the embryos are fed directly within the mother. Aren't guppies basically holding fertilized eggs within the body until after they hatch?
 
Viviporous refers to any animal which births live young, and this includes those that keep fertilized eggs inside the body until the young have completed gestation. It does not specify mammals. Ovoviviparous refers to eggs that are held inside the body for gestation and receive minimal nutrients from the parent, and is specific to fish, insects, and reptiles. Ovoviviparous is the more accurate, yet less commonly used, term for guppies. So, an animal can accurately be considered both, but mammals are not considered ovoviviparous (at least, none that I know of!), and there are mammals that lay eggs--the monotremes, including the platypus and echinda.

Interestingly, there are many snakes that bear live young, and the term also describes seahorses, where internal gestational care is provided by the male.
 
Computer geek for a fish division. Lots of biology courses--I would have gone into biochem if I weren't intimidated by math. ;)

Yep, sharks are included in the large family 'fish'. It's usually called 'aplacental viviparity' rather than ovoviviparity, but means the same thing.
 
I must say I'm a little jealous of your knowledge. I tried to go into chem. engineering, but I had to drop out after failing everything I took. (apparently going to class under various forms of mind altering states is a bad idea...:confused: ) But now I'm back, taking Drafting and Design since I have been doing that kind of stuff for the last 6 years now. .....wish i were taking chemistry or some kind of wild life courses, even if just to learn more....

anyway, posts like yours is the reason i like AC so much.
thanks for all the input!
 
You're welcome. I'm very fortunate that I have bosses that support my thirst for knowledge--they encourage me to take biology courses, and send me out to work with our biologists and culturists in the field. It's a real boon! There is always so much to learn!
 
AquariaCentral.com