Population genetics of invasive common carp Cyprinus carpio L. in coastal drainages in eastern Australia
Haynes, G.D., Gilligan, D.M., Grewe, P., Moran, C. and Nicholas, F.W., 2010. Population genetics of invasive common carp Cyprinus carpio L. in coastal drainages in eastern Australia. Journal of Fish Biology, 77(5): 1150–1157.
We investigated the genetics of introduced carp populations from three coastal drainages in New South Wales (the Hunter, Hawkesbury-Nepean and the Sydney basins) to determine their likely origin and the extent to which they are genetically differentiated. Samples of populations from each of these catchments (as well as Prospect Reservoir in western Sydney) were compared with each other and with wild European carp from the River Danube and domesticated Japanese and Australian koi carp. All carp from Prospect Reservoir (the first carp population established in NSW) and most of the carp from the Hawkesbury-Nepean and Hunter Rivers have exclusively European ancestry. The carp populations in the Hunter and Hawkesbury-Nepean Rivers are likely to have a common origin based upon the original Prospect strain of carp, but also have some signals of interbreeding with koi carp. Koi carp are the dominant strain in the Sydney Basin, with all fish showing at least some koi ancestry. The release/escape of koi is still occurring in NSW. Not only can this result in the establishment of new populations in carp-free catchments, but it adds additional genetic variation to already established populations, which may increase their invasive potential.