When I lived in Canada those (burbot sci name: Lota Lota) were often called Dogfish. They look a lot like Bowfin (grinnel, mudfish, sci name: Amia Calva). Totally different fish but very similar in appearance.
See:

Bowfin aren't real good to eat. They are particularly stinky fish, and after you've handled one you really don't want to eat it. Trust me, on this. Supposedly some Cajuns can make them palatable but it takes a little effort, and some serious spices. I've heard freshness and eating it while it's still hot is crucial. For sure though, I've handled enough of them not to want to try a bite. The initial whiff of a live bowfin is enough to turn me off. I'm not a picky eater. I couldn't get my size if I was. But I don't think I could eat that.
I suspect mistaking them for bowfin is why Burbot/Dogfish weren't pursued all that aggressively in the part of Canada I lived. Oddly, these same folks thought "sheepshead" aka Freshwater Drum were just dandy. I know if you keep a drum practically anywhere on the Tennessee river the locals think you are nuts. Truthfully, I've cooked them and they were just fine. They are a course white meat fish that is somewhat slimy. Boiled and dipped in melted butter they are like "poormans lobster". Heck, many Europeans think Americans are absolutely crazy for considering Carp trash fish. To each his own. Some folks in Alabama actually eat Gar and like it! Although my one personally experience attempting this, led me to decide, cleaning them is more work than it is worth. I couldn't get anything out of the one I tried to clean I'd want to attempt to consume. We'll leave the description of the effort at that.
Personally, I've never tried Burbot. I believe you, that you can cook it up to be pretty tasty. If they fight anything like bowfin, which I've caught quite a few of, I'm sure you had a blast. Bowfin are really fun to fight, they jump, they run, they dive for cover, they absolutely PUNISH artificial lures (understatement), you can't ask for a fish to be more spunky. Because of their incredible sportiness, I've specifically targeted bowfin on several fishing adventures. Catch and release, sometimes you can catch the same one multiple times in the same day! They really are lots of fun, worth the effort, even if you're not going to eat them.
In short, if Burbot are anything like the similar looking Bowfin and they are good to eat to boot. I'm jealous.