Turns out it's the infamous and highly illegal (alive) Snakehead. More on snaky later this evening - and a completely rewriten and rephotoed Catfish section (scored a walking catfish (also a controlled species) earlier in the week and a 6-1/2 pound channel cat today).
[image|http://www.clovegarden.com/ingred/img/sf_snakeh04g.jpg||||]