to answer the ops question , african snakeheads ie all parachanna are included in the ban unfortunatly.
i have to agree no scientific studdies have yet been published on the possable impact of snakeheads , but that does not mean that it has not been carried out and not realised to the public.
i know work is going on to see if the population of micopeltes in floria is realated to the natural stocks in asia via dna testing.
unfortunatly i think the damage is now done to the extent that all the hype in the press that made these fish out to be some alian creatures and genrally panic the public ,will have a lasting impression. even if some states started to allow the keeping of snakeheads, it is still a fedral offence to import or cross state lines ,and i doubt there are enough still in the states to start any sort of breeding program within each state .
the main problem you have is channa argus can live in most of the states waterways, and marulia and micos are found in florida , and from a goverment point of view it is far easier to control if all are banned rarther than just the argus , or else people would no doubt just import the banned ones under the name of a fish that wasnt banned , for example who is going to check the imports and decide from just looking what is an argus and what is a maculata or panaw . remember the vast majority of snakeheads look the same when youngsters
dont worry though because you are not allone , the ban is on its way here too , we have been repreaved of it until 2010 , our goverment is useing the fact that some species of snakehead can carry a virus ,which could damage uk fish stocks , farmers and indeed countries have been given until 2010 to be 100% virus free if they do not comply then they will not be allowed to import into the e.u. this means that allough undoubtly some farmers will become virus free, wild fish i doubt will be around after that date. luckly we have allready got several serious breeders set-up in the uk and the rest of europe.
you can garrentie at this 1st sign of the ban overthere being dropped this issue would be raised straigh way
cheers col