depends on the clan and the females they have. the avp2 shown only 4 preds total, so there is no definite answer to your question. there could be hundreds to one clan or thousands.
HEY, i am going as i seen in avp2 for now. But, there could be more then hundreds, there could be thousands, depending on the clan itself. Plus, last i heard, there was 3 different clans for the movies there was.
Hmm.... long-lived animals I have found dont really breed all that much. Take elephants for example. They dont exactly have too many babys. That would mean the population wouldnt get much bigger, and it would be hard replentishing the losses that obviously occour whenever you put your kids in the path of a Xeno :P
Id say there wouldn't be more than about 200 in a clan. But that's just me guessing.