Imports are notoriously difficult to acclimate and many keepers have given up on them after losing large numbers.
However, a few breeders have produced captive hatched young and they seem to do just fine.
As for imports and quotas I can't say but it could be that dealers are holding back adult females in hopes they may drop eggs. I know for a fact that one importer/dealer in South Florida used to routinely inject all adult female turtles they got in with Oxytocin to force them to drop their eggs.

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