Might not work - depending on the method of capture. In the case of the signal crayfish (currently invading UK rivers) - trapping them targets the adults, but adult crayfish are a significant predator of their own young*, so depleting the adult population creates a population explosion the next generation.
*Animals habitually eating their own young sounds like it should be a terrible evolutionary strategy (and therefore selected against), but this is not necessarily the case - lay a million eggs that hatch out into active offspring, then use them as errand-boys to voraciously collect and concentrate resources. As long as you don’t eat them all, it makes perfect sense…