and the spillivay of an old mill dam form obstructions below iT/hich 

 the upstream mif^^ants tend to accumulate. Periodic collections 

 mere made at both of these natural falls. This was done by dip- 

 ping -with scap-nets or by capturing by hand in the white water 

 on the face, or at the base, of the falls. A total of ^11 sea 

 lampreys were collected in this manner. 



In addition to the 580 unspawned, upstream inigrants collected 

 in Ocqueoc Lake and at the falls in the river, 99 spawning, or 

 spent and dying or dead sea lampreys were collected on, or near, 

 •Uie various spawning grounds in the river. 



Water temperature and water gauge readings were recorded for 

 the Ocqueoc River at a station situated 100 feet below the outlet 

 of Ocqueoc Lake, As in the Carp Creek, a maximum-minimum ther- 

 mometer was maintained and minimum, mean, and maximum water tem- 

 peratures were recorded for the period April l^-August h, 1914-7 • 

 The same water temperature and water gauge station in the Ocqueoc 

 River was maintained in 19U8 and records were kept for the period 

 April U-August 20. 



(U) Collection of data in 19U9 



The Ocqueoc River sea lamprey weir was in effective operation 

 for trapping upstream migrants from March 31-September 30, 19U9. 

 The trap vras operated, inspected, and the fish removed in accordance 

 with the procedure follovred for the Carp Creek weir. All data 

 pertaining to the nins of sea lampreys and other fishes tvere recorded 

 in the same manner as that for Carp Creek. 



The sex of all sea lampreys composing the 19U9 run (2U,6U3 

 specimens) was determined. Length data were obtained from all sea 

 lampreys entering the river during alternate 2U-hour periods "vrtien 

 the total rvn at any visit did not exceed 100 individuals. INhen 

 the rvn during any visit of a sampling period exceeded that number, 

 a random sample of 100 was measured (total length sample — 3j830 

 specimens) . 



llaximum-^mjiiraum thermometers were maintained at the weir for 

 records of air and water temperature throughout the period of weir 

 operation. Water gauge readings are in inches and represent abso- 

 lute depth across the deck of the weir. 



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