254 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 

 TOTAL LENGTH IN INCHES 

 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.6 11.5 12.5 13.5 14.5 



2 



IS 



I e 



14 



W 



kJ 



O '2 



z 



o 



2 10 



I- 

 X 



o 



75 100 125 150 175 200 225 250 275 



STANDARD LENGTH IN MILLIMETERS 



3 



5 5 



50 



450 



400 



35 



3 00 



250 



200 



I 50 



1 



5 



< 



a: 

 O 



I 



32 5 



FinuRE 10. — Relation between length and weight in yellow perch of Lake Eric. Solid portion of the curve represents 

 length range to which equation W^cL" was fitted; broken lines represent the curve in length ranges not well repre- 

 sented in the data. Dots show averages of empirical data grouped into 5-nim. length intervals. 



tuations in the coefficient of condition (K) of the 

 Lake Erie yellow perch according to month of 

 capture, sex and maturity, state of gonads, age, 

 length, and type of gear employed. The data 

 obtained from samples taken in the period 1943-48 

 will be omitted from this discussion since they 

 contribute nothing new and would bring about no 

 important changes in the conclusions. 



Monthly and annual fluctuations in the value of K 



Among the factors that might be expected to 

 influence monthly variations in /t are food, degree 

 of activity, and stage of sexual maturity. Spawn- 

 ing, and the preparatory sexual development, 

 may be expected to produce the greatest changes 

 in condition. Description of the montlily and 

 annual fluctuations in the value of K in the Lake 



