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The bullhead’s voracious appetite decreases with the coming of winter. The fish stop feeding, become sluggish and often bury themselves in soft, leafy ooze along the shore with only their mouths and gills exposed to the water above the surface of the mud. The ability to “hibernate” allows the bullhead to survive seriouswinterkill (low oxygen and/or low temperature) conditions.
Good luck eating stonecats I'm sure he means yellow/black bullheads... They are good to eat but a pain in the ass to clean...I'd try Tongue River Reservoir, you can catch them by the bucketload open water. I've only taken 2 trips out there icefishing & don't remeber anyone catching one through the ice...Anybody ever caught a bullhead through the ice on Tongue?
I do know that in early spring the Gallatin river and the Madison river have a high concentration of bull heads. If you are in the area in the spring, Happy Hunting