Bigmouth buffalo:- -The average calculated 

 total length of age group I, based on a collection 

 of 16 fish of that age group from area B in 1949, 

 was 5.1 inches. Annuli could not be identified 

 on scales of two larger specimens collected at 

 the same time. 



Smallmouth buffalo:- -Eight smallmouth 

 buffalo were collected in area B in 1949. All 

 were of age group I and the average calculated 

 total length at time of armulus formation was 

 5 .8 inches . 



Orangespotted sunfish:--Of 18 fish col- 

 lected from area A, all but one were of age 

 group I, the lone exception being of age group 

 II. The average calculated total lengths of 

 age groups I and II were 1 .1 and 2.6 inches, 

 respectively. 



Comparison of growth in areas A and B and 

 Illinois waters of the Mississippi River 



General growth-rate information for 

 several species in the Illinois-Missouri waters 

 of the Mississippi River were reported by the 

 Upper Mississippi River Conservation Com- 

 mittee (62). Data for six species taken from 

 this report, together with a summary of findings 

 of the present study, are shown in table 31 . 

 Since the growth figures for the lower section 

 of the river appeared in a brief tabular form 

 with no details concerning the manner of calcu- 

 lation, a precise comparison is not possible. 

 In addition, growth of certain species was based 

 on average total lengths at capture for which 

 the dates are unknown. 



The growth of both the black and white 

 crappies in areas A and B was faster than that 

 for these species in the Illinois-Missouri waters 

 of the Mississippi River . Reliability of this 



Table 31: --Growth rates of six species in areas A and B and Illinois- 

 Missouri waters of the Mississippi River expressed as total 

 lengths in inches. Except where indicated, calculated lengths 

 are shown. 



1/ Average lengths at time of capture, July 6-7. 19U8. 

 2/ Average lengths at time of capture, August 3. 19li9. 

 3/ Average lengths at time of capture, 19lilj (no dates given). 



40 



