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I may be wrong but duckweed grows in ponds and still waters, not
rivers. If carp are from rivers, it wouldn't be part of their diet.

Little shiny plastic lures aren't part of a trout's diet, yet they try to
eat them. ;-) I'm sure any carp will taste most anything that plant-like
(think lettuce or spinach some feed their koi) and go Yummy when they taste
duck weed. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us