period in Burt and Mullet lakes, Cheboygan County. Furthermore, 

 these small populations are apparently creating limited spavming 

 runs of their own in tributaries of the Cheboygan River drainage 

 of Tnidch the lakes are a part. The Cheboygan River itself is 

 blocked at its mouth by a power dam Twhich in itself constitutes 

 a virtual barrier to further migration of the large run entering 

 that river each year from Lake Hviron. Unfortunately this barrier 

 is accidentally by-passed in two ways: first, a boat lock, adja- 

 cent to the dam, is occasionally operated during the spring season 

 and undoubtedly acts as an efficient "fish elevator" j secondly, 

 some are known to escape upstream from youngsters "vvho consider it 

 fine sport to dip sea lampreys at the base of the spillway of the 

 dam and occasionally throw the lampreys over the causeivay atop 

 the dan into the upper river channel. 



The evidence supporting establishment of the sea lamprey in 

 Burt and Mullet lakes is itemized as follows: 



(1) A sexually immature adult sea lamprey, 1^.1 inches long 

 (vreight: 135 grams), was taken in Burt Lake on August 1, 

 19U7. This specimen was attached to a rainbow trout. 



(2) A sexually immature adult sea lamprey, 12.2 inches long 

 (weight: 68 grams), was taken in 3S,fullet Lake off the 

 mouth of Nigger Creek on August 1, 19U7. This specimen 

 wa.s attached to a sucker. 



(3) An adult sea lamprey, attached to a sucker, was taken in 

 Mullet Lake near Topinabee on August 16, 19U5 (Specimen 

 identified by Dr. C. W. Creaser.) 



(U) A spaivning migrant was observed in the Sturgeon River 

 (tributary to Burt Lake) at Wolverine on June 2I4., 19U7. 



(5) An adult, female sea lamprey was captured by fishermen 

 in the Pigeon River (Otsego County, T32N, RIW, S.IO) on 

 June 11, I9U8 (identified by W. R. Crowe). Sea lamprey 

 redds were observed by W. R. Crowe in the Pigeon River 

 (Cheboygan County, T3Un, R2W, S.IO) on or about June 9, 

 19U3. The Pigeon River is a tributary of Mullet Lalce. 



(6) The report of a spawning run in Laparell Creek, tributary 

 to the Cheboygan River below Mullet Lake, is considered 

 reliable. 



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