The two dorsal fins on a Walleye I believe are separate, not joined like a zander.
Also, a Walleye has bars or stripes down its side like a perch, although they are not as pronounced.
I too love bass Richard and have caught thousands in my life, both small mouth and large mouth.
Around 1976 I corresponded with **** Walker on the subject of stocking rainbow trout. He was keen for me to get some of the Sam Holland (of Avington fame) ova to see if we could hatch it out in SA. We found out that such importation was against the law.
The subject changed to other species of fish. I mentioned to him about smallmouth bass and what a fine species they were, not only on the end of the line but sizzling in the pan.
I suggested that maybe smallmouth bass could be stocked into British waters, land locked ones of course.
He replied by return of post saying that it was not a good idea at all. The reasons he gave was that the protein conversion of bass was not as good as a rainbow trout. Not only that, but if the species escaped into rivers, it would "chomp every small fish in sight" - his words. He mentioned that at least with the rainbow trout there was not the chance of them overrunning our waters as apart from odd places, they don't breed naturally in Britain.
Bass are certainly prolific breeders and there is no doubt they would do well here, as they have apparently in the very private lake at Mildenhall.
Small mouth bass are also found in Swedish, Norwegian, Danish and Dutch waters.