398 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 3 



Table 26. — Average calculated total lengths in inches of 95 green sunfish collected from Onized 

 Lake in the census of June 24-28, 1941. 



(f) 

 u 



X 



o 



z 



o 



z 

 u 



_J 



< 



I- 

 o 



I- 



12 3 4 



YEARS OF LIFE 



Fig. 9. — Average rate of growth of green sunfish in Onized Lake and in southern Michigan. 



was 0.036 pound and of the warmouth 

 bass 0.017 pound, table 7. 



The average calculated total lengths of 

 95 green sunfish are given in table 26 and 

 a growth curve constructed from these 

 lengths is shown in fig. 9. Also in fig. 9 

 is shown a growth curve of this species 

 from southern Michigan, based on the 

 data of Hubbs & Cooper ( 1935) . Appar- 

 ently in Michigan a combination of stunt- 

 ing and a short growing season limits the 

 number of green sunfish that reach usable 

 size. Hubbs & Cooper state, "only one 



fish in thirty-two from the southern zone: 

 is of legal size" (6 inches). In Onized 

 Lake, only 1 fish in 27 had reached a 

 length of 6 inches at the time of the 194jt 

 census, tables 7 and 8. 



Yellow Bass 



Morone interrupta Gill 



Four yellow bass were collected in thl 

 final Onized Lake census of 1941, table 7 

 Their lengths were 11.1, 11.4, 11.5 anc 

 11.5 inches and their weights, 0.50, 0.88 



