I have absolutely no idea as I have never seen one, but my imagination leads me to believe a smelt might be like a sardine? Guess that should be my next question...how do you prepare a smelt to make it edible? Again, I was just wondering how people might prepare a fish like this, as the smallest perch I have kept are in the 9 inch range and found the fillets fairly small (some of those little buggers have big rib cages). There have been some good answers here, I just couldn't imagine filleting a 7 inch perch, and methods others have described make a lot of sense.