N 20.U PICK CREEK (Lake Nerka) 



SUMMARY OF SURVEYS 



frcm main ponds only 



1948 T 7,659 



8/31 G 100 cf, 102 9 measiirements; 



98 cf, 100 9 scales. Probably 



pond sample 



1949 T 357 

 8/17 G 



9/5 G 



1950 T 

 8/3-5 G 



1951 T 4,652 



20 cf, 20 9 scales. Samples 

 from pond only 



8/5 G 1,1+00 Rovigh pond estimate while 



doing experiment 



8/8 G 29 o', 33 9 measurements 



77 



