These tivo pealcs were separated by a sliarp decline in mi^ratorj'' 

 activity v±iich reached a niiniimm between May 29 and May 31 I'^ien 

 the run virtually ceased. This decline was apparently induced 

 by a severe drop in v/ater teniperatures resulting from sleet, 

 hail, and cold rain storms v^iich began on I.:ay 26 and lasted for 

 four days. Had tliis unseasonably cold T:eather not arrived Tn.th 

 its resultant effect upon the creelc water temperatures, I believe 

 a single major influx of upstrean migrants would have occiirred 

 between I.Iay 1$ and June 7. 



From June 22 on, a small and generally declining number of sea 

 lampreys entered the trap each day until July 13 when the last mi- 

 grant, a male, was taJcen. The weir and trap vrere inspected regu- 

 larly until August 1 but no additional sea lampreys were captured. 



Carp Creek , 19lt8 t — The earliest migrants entering Carp Creek 

 were four specimens talcen on April 15. The weir was placed in 

 operation on April 7 but was inoperative during April 9-13 due to 

 severe flood conditions. During this period, creek water tempera- 

 tures were as low as, or lower, than the temperatures in Hammond Bay 

 (Appendix C). Subsequent checks of the watershed for escapement 

 indicated that one, and perhaps two, sea lampreys may have entered 

 the creek during this period, A small number of lampreys (11 indi- 

 viduals) entered the trap between April 1^ and 22 (Figure 16), 

 Thereafter, the run rose abruptly to its peak. I.!ost migrants 

 (99,0 percent) entered the creek during the I;6-day period vrhich 

 followed (to June 9). A cold "snap" between May 3 and 12 interrupted 

 this major movement for a period of four to five days. During 19U8, 

 trap catches in excess of 100 sea lampreys during a 2l|.-hour period 

 occurred on nine different occasions. The greatest movement was on 

 the night of Llay 17-13 vihen 227 sea lampreys were taken between 

 nightfall and daylight. 



After June 9) only a very small number of lampreys entered the 

 trap and the run was discontinuous in character. On July 6, the 

 last migrant into Carp Creek was tal<en in the trap. 



Tlie total run in 19U8 amounted to 2,939 sea lampreys. 



Unlike the spring of 19h7> which was cold, wet, and late, that 

 season in 19U3 was warmer, drier, and earlier. The sea lamprey 

 run in 19l|8 was characterized by sudden movements of large numbers 

 of migrants which generally occurred on warm nights. As a result, 

 many abrupt peaks of migratory activity occurred during the period 

 of major upstream movement. In contrast, the 19U7 run displayed 

 far less abrupt increases in migratory activity and such peaks as 

 occurred were fewer in number. 



Carp Creek, 19U9: — The first lamprey entering the creek was 

 talcen on April 9. The weir had been placed in operation on April 

 7. Prior to that date, creek temperatures vrere as low as or lower 

 than the temperatures in Hammond Bay (Appendix C). Subsequent checks 

 of the watershed indicated that no lampreys entered the creek prior 



