I'm a bit out of my depth on how it actually works, but have attended several seminars on them and they're a pain in the butt to eradicate. You won't generally see them outside of their prime habitat, but if you electrofish or dam and drain a waterway you'll often find them outside of their ideal habitat as well.
In regards to being semi-clonal, the word I was looking for was sperm-parasites:
Quote:
Females spawn with several other species, for example Cyprinus carpio and Carassius carassius, but the eggs just develop without being actually fertilized resulting in a female only population (Ref. 2059). In Europe, populations considered as triploid and only females. But in some populations, it should be possible to find up to 25% of males which should be diploid (Ref. 40476). "There are also all-female populations in which all individuals are triploids. Triploids are sperm parasites of other cyprinid species such as Cyprinus carpio, Rutilus rutilus and Abramis brama.
|
http://www.fishbase.ca/summary/6376
http://www.fishbase.ca/references/FB...y.php?ID=59043
If anyone's interested PM me and I can put them in touch with one of the researchers. Primary issue with Prussian carp is awareness and public education. They've been finding isolated groups of them spreading outwards in various portions of the province, usually near major fishing, boating or travel routes, suggesting humans are moving them faster than they spread on their own.