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You do not say whether or not this species is breeding in the wild, but if so many of them have been dumped, it is likely that they have become established as an alien species.
It is very irresponsible for importers of foreign fish to dump their stock locally. They should have their licences removed and be fined if they are found doing this, but I suppose it is quite difficult to prove exactly who did it.
They should not be too difficult to hunt if they are seen "walking" around.
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