CONTENTS 



Page 



Commercial production of yellow perch in Lake Erie 205 



Materials and methods 211 



Determination of age and growth of Lake Erie yellow perch by the 



scale method 214 



Validity of the annulus as a year mark 214 



Body-scale relation 215 



Calculation of growth • 218 



Calcxilated growth histories of the age groups 218 



Discrepancies in the calculated growth histories of different age groups. _ 220 



Selection by gear 220 



Segregation correlated with sexual maturity ..'- 22 1 



Selective destruction according to the legal size limit 222 



Other causes 223 



General growth curves 223 



Growth in length 223 



Growth in weight 224 



Growth of yellow perch in Lake Erie compared with that in other 



waters 227 



Growth compensation 229 



Proportion of season's growth completed at time of captm-e 230 



Aimual fluctuations in growth 232 



Length-frequency distribution 236 



Age composition and abundance of year classes 243 



Length-weight relation 252 



Coefficient of condition (K) 253 



Monthly and annual fluctuations ui the value of K 254 



Fluctuations m value of K with stage of maturity 256 



Fluctuations in value of if with age 256 



Influence of rate of growth on value of K 257 



Effect of type of gear on determining value of K 258 



Size at matm^ity 259 



Sex ratio 260 



Summary 262 



Bibliography 264 



II 



