I have not read the original language of the law, but my understanding was
that it pertained to "injurious" species - those that would appear on a
state's "dirty list" of organisms believed to pose significant environmental
threat to local ecosystems. Threat I would assume is based on a
combination of potential harm and liklihood of establishment. I do not
believe that darters and most tetras would appear on such a list (in most
states).
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