Several tagged lampreys were taken by commercial fisherman in 

 the Straits of Mackinaw, St. Martins Bay, and Mackinaw Creek near 

 Hessel, Michigan. These recoveries indicate that many of the Cheboygan 

 River migrants find their way across the deeper waters of the Straits 

 and into the streams and rivers of the Upper Peninsula of the Michigan 

 and perhaps contribute significantly to the spawning runs of those 

 streams. 



The portion of the blocked run that is diverted into other streams 

 apparently moves in all directions from the mouth of the Cheboygan 

 River with the majority following the Lake Huron and Lake Michigan 

 shorelines of the lower peninsula (Figs. 10 and 11). It is difficult 

 to define the farthest limits of dispersion of the blockaded Cheboygan 

 River run as there were few devices for recapturing the tagged speci- 

 mens in any area other than Control Zone H-l. Since little publicity 

 concerning the experiment was given beyond the local area, it is en- 

 tirely possible that some tags recovered by commercial fishermen in 

 more distant locales were not returned. It is significant, however, 

 that no tagged lampreys were taken in the Pendill's Creek weir and trap 

 (Chippewa Co.), the Black River weir and trap (Mackinaw Co.)* the Trail 

 Creek trap (La Porte Co., Indiana), any of the 7 installations operated 

 in Wisconsin, or those operated by the Province of Ontario. 



The most distant reported recovery was from Glen Arbor Bay, Lake 

 Michigan, approximately 150 miles west and south of Cheboygan (Fig. 10). 

 This lamprey was taken by a commerical fisherman in a gill net 52 days 

 after it was tagged and released at the power dam. In the other direct- 

 ion the farthest recoveries were two lampreys taken in the trap in Trout 

 River, Presque Isle ^o., U3 miles east of the point of tagging (^ig.ll). 

 The first capture was recorded 13 days after release and the second 5 

 days later. 



Evidently little correlation exists between distance traveled and 

 the number of days elapsing between tagging and recapture within the 

 limited area where devices were present for recovering the migrants. 

 The number of days from the time the lampreys were tagged until they 

 were recovered varied greatly (Table 9). Within a radius of 2 to 10 

 miles of the point of tagging, total time out varied from 2 to 50 days; 

 11 to 20 miles distant it varied from 3 to 65 days; and 21 to U3 miles 

 away it varied from U to 37 days. Obviously some of the tagged lampreys 

 wandered in the Lakes for a considerable time before entering another 

 stream in search of a spawning area. Others apparently did not deviate 

 from the most direct route to the stream they entered. 



The influence of the diverted Cheboygan River run on the runs of 

 other streams varied with the size of the stream and the distance from 

 the Cheboj^gan River. For examole, the Ocqueoc River which is the 

 largest unobstructed stream in Control ^one H-l, is 30 miles east and 

 south of the point of tagging ; 71 tagged lampreys were trapped there. 



35 



