Since carp are invasive in the US, they are considered more problematic than positive.
In some places electric barriers are erected to keep them from spreading to new areas (especially grass carp to the Great Lakes)
In fact at this time of year (when carp are spawning in shallow areas) bow and arrow hunting jamborees are encouraged to keep carp numbers down, in may lakes they are considered a scourge, stirring up phosphorus, and eating native fish eggs and plants.
They are also looked at as a rough fish, and hardly ever eaten (except smoked).
To the OP, if a female is caught, taking and squeezing out roe to feed your fish might work, and help keep their numbers manageable.