Doesn't an "injurious species" that is "in trade" constitute greater
environmental threat than a species that is not in trade ? Especially, if
it is highly mobile but not yet established ?
Restricting trade in bighead and silver carp may help less than restricting
trade in other potentially destructive/inasive species (like the
mollusc-gobbling black carp which is not yet known to have breeding
populations in the US).
And...a personal observation....impacts of these species can be
understimated when we only consider their characteristic habitats. The
giant Eurasian carps are considered big water species which generate concern
about impacts on lake or riverine systems, but those fish can thrive in
other smaller habitats where their impacts may be even more substantial.
- Jan
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