Feeding adults are usually found attached to other fishes in large rivers, lakes, and impoundments. They migrate upriver to spawn in gravel riffles and runs. Ammocoetes occur in sandy or muddy pools and backwaters where they stay as larvae for about 4 to 7 years. Adults are parasitic for 1 to 2 years. Semelparous. Listed as anadromous species in Ref. 51243.