Yet another reason to keep those biodiversity surveys going: CNews is reporting that Canadian scientists surveying the Don River back in October found grass carp (Ctenopharyngodon idella) among the fish they were cataloguing. Only a single fish was found, and there is no evidence to suggest there are established populations of the carp. However, officials remain concerned, due to the fact that this fish find occurred at the mouth of a river that feeds into Lake Ontario. Grass carp are the same species often sought after to control aquatic invasive plants such as hydrilla (Hydrilla verticillata) (see previous blog entries). You can also read an older article about the grass carp in Lake Ontario from The Globe and Mail.