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There have been changes recently and there are schemes to repopulate areas with this little beastie.
They are the most resistant to unfavourable conditions of environment, and are able, by a process of parthenogenesis, to give rise to ordinary, indifferent forms again, which can repopulate the gnat.
That's why scientists are so intrigued by creating safe harbors for fish, so they have a chance to mature and repopulate.