There are a few types of carp that have been imported and have all ended up being invasive species. The grass carp was brought in to control algae but instead ate huge quantities of submerged aquatic vegetation, damaging the ecosystem and limiting the food supply of other animals. Similarly, asian carp can become quite large and thus eat a lot, taking over the food niches formerly occupied by indigenous fish. They are salt tolerant and can handle cold water so there is little to prevent them traveling and spreading via rivers and canals into the Great Lakes. In short, they are bigger, stronger, and eat more than most of the fish they are out-competing.
I have heard they eat other fish’s eggs as well, is there any truth to that?
They are omnivorous and it seems they do eat spawning fish’s eggs: http://www3.northern.edu/natsource/FISH/Common1.htm
It took a little digging to find out about the fish eggs, though, while it was easy to find they enjoy a diet that includes plant life, plankton, small crustaceans (crayfish, for example) and gastropods (like molluscs) and even benthic worms.
I don’t know if they have a preference or will just eat whatever they find first.
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