FISHERY BULLETIN: VOL. 83, NO. 4 



mean length of 105.9 cm for June was not included 

 in further analyses because its inclusion more than 

 doubled the residual sums of squares for the model 

 fit. We consider it an outlier. 

 Figure 5 shows Gompertz models of growth fit- 



ted separately to the mean lengths, excluding the 

 92.7 cm point for March, from columns 1, 3, and 5 

 (curve A) and, excluding the 105.9 cm point for June, 

 from columns 2 and 4 (curve B) of Ikble 2. Time at 

 birth and lengths at 1 and 2 yr were calculated as 



Table 2.— Mean lengths of the fitted normal distributions for the northern 

 offshore spotted dolphin. 



'These mean lengths were not Included in further analyses. 



160 



Lt = 82.0e 



E 140 

 u 



H 

 O 



z 



120 



< 



g 100 



80 



0.059 



"•"^^ ri_e-o.o79n 



0.079 U ® J 



0.057 L' ** -J 



MAMJ 



I I I I I I I 

 J ASOND J 



I I I I I I 

 FMAM J J 



ASOND J FM AMJ J ASO 

 MONTH 



Figure 5.— Mean values of monthly distributions of length from data for the northern offshore spotted dolphin. The 

 two curves represent two annual cohorts fitted separately by the Gompertz model of growth. NOTE: The equations 

 were fitted using relative time and are not therefore accurate models of growth, lb obtain such growth models, relative 

 time can be converted to absolute time using the estimate of length at birth and the equation refitted to these data. 



560 



