Tim,
WDFW is well aware of the invasive Common Carp issue in many lakes and
rivers in the state.


>From the WDFW website:

"Common carp and Koi (decorative carp) thrive in turbid rivers and lakes.
They are omnivorous, eating insects, crustaceans, annelids, molluscs, and
seeds from weeds and trees. For the most part they grub in the sediments to
find food, stirring up sediments and increasing turbidity. Adults will
uproot and destroy aquatic vegetation, which may be detrimental to ducks
and other fish populations. There are carp in many lakes in the state, and
people are encouraged to fish for them. They are not to be put back into
any waters of the state. We would like to diminish these populations."

Fisherman do fish for Carp, but its not a particularly popular game fish.

The Common Carp's cousin, the Grass Carp can be introduced in a sterile
form for the purpose of controlling aquatic weeds by special permit.

Interestingly, a large proportion of the fish species that inhabit Lake
Washington are introduced. Off the top my head, a partial list would
include Largemouth Bass, Smallmouth Bass, Yellow Perch, Brown Bullhead (the
catfish often photographed in heron's mouths), Pumpkinseed, and Black
Crappie.

Josh Adams
Cathcart, WA
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