Environment: Man's Best Friend?

Imagine the perfect fish. It would be plentiful, but would not harm other fish. Delicious to eat, it would also be such a powerful jumper and swimmer that sportsmen would revere its ability as a fighter. As an extra benefit, this paragon would feast on something that nobody wants. Does such a fish exist? Indeed, yes. It is called the white amur (Ctenopharyngodon idella), a member of the carp family that is native to eastern Asia, where it is prized as a delicacy. Three feet in length and 70 lbs. in weight, an adult amur just loves to eat—so much,...

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