64 Carrying Capacity^ Productivity^ and Growth 



Trout 



Walleye 



Rock Bass 



Pike 



Y. Perch 



Lm. Bass 



Ch. Catfish 



Pumpkinseed 



Quillbacks 



Drum 



Bowfin 



Crappies 



Suckers 



Bluegill 



Sunfishes 



Bullheads 



Carp 



Buffaloes 



Giz. Shad 



Standing Crop in Pounds Per Acre 



4 6 10 20 4060 100 200 400 10002000 



10 



J I 



1 



^////////// 



m 



10 100 



Mean for Lakes and Reservoirs 

 Maximum 



1000 



Figure 4.2. Standing crops of named fishes in North American lakes and 

 reservoirs. Usually these fish were in combination with other species. This figure 

 furnishes a rough approximation of the relative efficiency of the species listed. 

 [From Carlander, K.D., /. Fish Res. Bd. Canada, 12(4) (1955)] 



show the influence of kinds of fish upon the standing crop. Ball,* re- 

 poisoning Ford Lake (Michigan) for a second time, found 2.4 times the 

 weight of fish which had been recovered when the lake was poisoned 10 

 years previously. In the earlier census, the yellow perch was dominant in 

 the population while in the latter census, the bluegill was dominant. Ball 



