Smelt are also found along the Oregon and Washington coast. My father, before I was born (1955), used to dip them out of the coastal rivers as they ran up from the ocean.
Later, when I was raised 300 miles inland in Spokane, we bought ours from the grocery store.
Mmmmmmmm .... clean them like trout, mix some salt and pepper with corn meal, place the cleaned, wet smelt in a big bag with the corn meal mix and shake vigorously. When the smelt are evenly coated, fry them in bacon grease, lard or butter.
Serve with corn and cornbread.
I bought some here in Utah a couple of months ago. They were from Canada and very black, compared to the silver-sided smelt I had in Washington. Much smaller too, some only the size of a ring finger. The smelt I had in Washington ran 5 or 6 inches.
Had to toss these Canadian smelt away after I cooked the first batch. Tasted soooo fishy they were unpalatable. Might have been spoiled but I bought them frozen. Ack!
They were decidedly not the smelt of days gone by.
Of course ... when I was a little sprat ... we used smelt as bait to catch Plesiosuars and Paleotrout ... with line made from the intestines of a brontosaurus!