Figure 1 

 Mult sea lamprey from the Great Lakes, 

 ehovdng eye, mouth parts, and gill openings. 



route to spawning sites, they do not prey on other fishes. 



These predators leisurely ascend rivers* To rest, they cling 

 with their large, powerful sucking mouths to rock walls and rocks below 

 or "behind waterfalls* Then they make a short Jump and rest again and 

 continue this process until they negotiate the obstacle. Sometimes they 

 "hitch" a ride by fastening to hulls or rudders of ships. At other times 

 they attach their mouths to rocks in the stream bed and stretch their 

 bodies in the current until they are refreshed before continuing the 

 journey to the spawning grounds. 



Their destination reached, the males and females make nests in 

 the beds of unpolluted streams at depths as great as three feet. With 

 quick bodily movements they uproot the larger stones from areas one to 

 about three feet in diameter. They use their mouths to move stones to 

 the downstream edge of the nest until they have made a three to six-inch 

 depression. After spawning in the pebble and gravel nests at short 



