396 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Annual fluctuation of growth in weight 



The annual increments of growth in weight 

 (tables 39 and 40) are arranged in the same 

 manner as those of length presented in an earlier 

 section. Likewise, the percentage deviations of 

 the growth in weight for the first and later years 

 of life (tables 41 and 42) were determined sepa- 

 rately because of the different pattern of growth 

 in the two periods. The fluctuations of growth 

 of males and females during their later years of 

 life agreed well except for 1944; if that year is 



excluded, the coefficient of correlation for the 

 percentages is 0.867. For the first year of life 

 agreement between males and females was poor 

 (r = 0.113) ; here the percentages for the sexes 

 were arbitrarily combined for the sake of con- 

 sistency with the treatment of other data on 

 growth. 



Since the calculated weights were based on the 

 calculated lengths, it was to be expected that the 

 trends of the annual fluctuation of growth in 

 weight would show certain similarities to those 

 of growth in length (figs. 17 and 18). However, 



Table 39. — Annual increment of growth in weight of male Saginaw Bay yellow perch, spawning-run collections of 1943-55 



[See table 32 for explanation of arrangement] 



Table 40. — Annual increment of growth in weight of female Saginaw Bay yellow perch, spawning-run collections of 1943-55 



[See table 32 for explanation of arrangement] 



