Table 1. --Number and kinds of fish passed by Snake Island fishway in 

 the Potomac River, spring of 1961 



Date 



Operative conditions 



Light 

 pene- 

 tra- 

 tion 



o a.m. 



water 

 temper- 

 ature 



Needle 



weirs 



out 



Stoplog 



openings 



closed 



Fishway 

 trap 

 lifts 



Fish passed 



Sucker 



Blue- 

 gill 



Chan- 

 nel 

 cat- 

 fish 



Carp 



May 



10 

 11 

 12 

 13 



15 

 , 17 

 19 

 20 

 21 



22 

 23 

 24 

 25 

 26 



27 

 28 

 29 

 30 

 31 



June 1 

 2 

 3 

 4 

 5 



6 



7 



Total 



Inches 



28.0 

 27.5 

 29.0 

 29.0 

 29.0 



29.0 

 24.0 

 25.0 

 10.0 

 16.0 



14.5 

 16.0 

 23.5 

 27.5 

 31.5 



32.0 

 37.0 

 38.5 

 39.0 

 40.0 



39.0 

 40.0 

 39.0 

 39.5 

 41.0 



40.0 

 39.5 

 39.5 

 40.0 

 40.0 



41.0 

 41.0 



C. 



12.7 

 13.8 

 14.4 

 14.4 

 14.4 



14.4 

 16.6 

 16.1 

 15.6 

 16.1 



16.1 

 15.6 

 16.1 

 16.1 

 16.1 



16.6 

 16.6 

 17.2 

 17.7 

 20.0 



17.8 

 21.1 

 17.8 

 16.7 

 17.2 



18.3 

 20.5 

 22.2 

 22.2 

 22.7 



23.3 

 23.3 



Number 



Number 



Number 



Number 



Number 



Number 



Number 



9 

 9 

 9 

 9 

 9 



9 

 9 

 9 

 9 

 9 



9 

 9 

 9 

 9 

 9 



9 

 9 



7 

 7 

 7 



7 

 7 

 7 

 7 

 7 



5 



4 



4 



10 



10 



5 

 5 



6 

 3 

 5 



4 



5 

 5 

 8 

 4 

 4 



9 



7 

 7 

 5 

 4 



3 

 5 

 9 



7 

 10 



206 



10 



