The anal fin is not clearly visible which is why I noted it above, its folded against the body. The mouth looks just like the bowfin I had in my tank, very thick lips. The coloring will look different on each bowfin, all wont look the same, especially on land out of the water.
I know that Bowfins are illegal to keep in Nevada.
Has a snakehead ever been confirmed in Nevada? According to this site, its not listed.
http://nas.er.usgs.gov/taxgroup/fish/northernsnakeheaddistribution.aspx
But I could be wrong.