I work for a company called Calgary Aquaculture and we deal with this allot. We build ponds and water features for koi (carp). The people who own these water features seem to think that "oh look out fish are getting big, lets dump them in the river and go get more". Problem with this is, we now have carp reproducing in rivers, tributaries and lakes. They eat plants for the most part, and plants being depleted which help balance an ecosystem, makes for unstable habitats. They also alter food chains. Look at it this way, walleye and pike were happy eating perch and trout, food chain is established and consistent, but now we have pike and walleye, and other predatory fish eating carp, who reproduce like rabbits. Now the pike and walleye population explodes, they need to eat, so they deplete the perch and trout population. See how fast things go out of control? People need to get their heads out of their asses and see what they are causing!
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