Don’t want invaders in your home? Why not kill them and eat them?  That’s the approach that consumer activist group Food & Water Watch is taking with three species of fish and a crustacean that have encroached on American waters.   In the picture are, from top to bottom, Asian carp, blue tilapia and lionfish, as well as green crabs.   Lionfish actually look much sexier before their exotic and poisonous spines have been removed, but Kerry Heffernan, the ...

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