The folks on the Auriga knew about the creature's existence, but they seemed to have thoroughly analyzed the life cycle (which is hard to have previously known about, given that even Burke seemed completely clueless of the Queen's existence as much as Bishop II and co. probably weren't aware of the fact that Ripley was carrying a Queen embryo). If there was a way to have collected more specimens such as letting the young Queen walk around the sealed room and impregnate all of the captives, they would probably would have done it. Gediman mentions that the Queen only had 2 cycles, one of which was unnatural.
Like I've said before, this creates a plothole for anyone who has seen A3 or A:R to give the Predator more to hunt at a faster pace.