Oh, my goodness. First we had the problem of the hydrilla, the Godzilla plant that migrated from Florida and threatens to take over and carpet the Potomac River and, in Fairfax County, Burke Lake.
One of several proposed solutions was to import something called triploid grass carp to eat the hydrilla. These nearly foot-long fish, bred in Arkansas without reproductive capacity (because, beyond the first generation as eaters of underwater plants, they're generally considered pests) were expected to feed themselves to death. Virginia's Commission on Game and Inland Fisheries bought 2,200 and introduced them to Burke Lake.
Maybe not. The Associated Press reports from Richmond that some Virginia and Maryland biologists have problems: if the triploids eat all the hydrilla, they might get hungry enough to eat more important underwater plants vital to waterfowl, and also some might somehow make their way downstream to the Chesapeake Bay where they might eat desirable vegetation and, perhaps -- horrors! -- some may turn out to be fertile and encounter the even more fertile biological cousin, the diploid carp.
The diploid (as contrasted with triploid) is illegal in Virginia, because it is considered a noxious fish that voraciously eats desirable marine plants.
The potential danger is that the diploids and triploids might get together and provide -- what? -- quadruploids, or whatever.