Biological Survey — Oswego Watershed 



195 



Table 1. — Showing Distribution of Available Fish Food in Streams 

 Above and Below 18 Feet in Width 



Approximate location of separate square feet from which collections were made. 

 1st sq. ft. . . in shallow water near one shore. 

 2d sq. ft. . . in center of stream bed 

 3d sq. ft. . . in shallow water near opposite shore. 





STATION NO. 



Width 



1st sq. ft. 

 wt. in 

 grams 



2d sq. ft 



wt. in 

 grams 



3d sq. ft. 



wt. in 

 grams 



Av. difference between 

 lst-3d sq. ft and 2d 

 sq. ft., in grama 



^ 



11 



3 ft.. . 

 6 ft... 



6 ft... 



7 ft... 

 11 ft.. . 



14 ft... 



15 ft... 



.98 

 3.97 



.99 

 3.64 



.78 

 2.73 



.65 



2.5 

 4.19 

 1.98 

 1.59 

 1.43 

 1.5 

 .75 



1.5 



.65 

 1.01 

 5.36 



.75 

 1.4 



.65 



1 . 26 higher in center. 

 1 . 88 higher in center. 



00 



15 



rH 



4 



is 



7 







10 





m 



1 







6 



.098 higher in center 







«♦., 



1* 



18 ft... 

 18 ft... 

 25 ft.. . 

 30 ft... 



1.72 



1.37 



.33 



3.67 



.53 

 1.04 



.065 

 1.67 



1.24 



1.14 



.63 



2.18 



.96 higher in sides. 



.21 higher in sides. 



.41 higher in sides. 



1.25 higher in sides. 



« 



2 



8 



o 



18 



< 





* These three bottom studies were weighed from alcohol after preservation for several weeks and 

 the results corrected by a coefficient which reduced the probable error due to loss of body weight 

 by alcohol. 



and the sides have become more productive. No studies were made 

 in streams intermediate between 15 and 18 feet in width, though 

 it is possible that the change may occur at some width lower than IS 

 feet or above 15 feet, Thus these figures agree in general with 

 Leger's work but are too few to calculate with certainty the rate 

 at which this occurs. 



5.0, 

 4.5 

 4.0 

 3.5- 

 3.0- 

 2.5- 

 2.0- 

 1.5- 

 1.0 

 • 5H 



o. 



li 



JLi 



O r-t r-\ 



Chart 1. — Showing relative amounts of available fish 

 food by grams per one square foot in selected types 

 of stream bottoms 



