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Bowfin (Dogfish) A medium-sized, greenish fish, the bowfin can be found in clear lakes and slow streams through much of Minnesota. Bowfin survive in murky, oxygen-depleted water by rising to the surface and gulping air into their air bladders. They can also survive out of water for a considerable time.
Fins are either single along the centerline of the fish: the dorsal fin, anal fin, and tail fin; or paired fins: the pectoral fins and pelvic fins. Pectoral fins help fish balance. The back fin or dorsal fin is also used in balance and protection and in some fish families (pike and gar) it is used for propulsion.