McGarvey and Fowler: Seasonal growth of Stilagtnodcs punctata 



555 



o 



28 months 

 n =24 



29 months 

 n =15 



47 months 

 n =152 



48 months 

 'i,„=39 



34 months 

 n.„=50 



49 months 



H- 



2aO 300 320 MO 340 IW 400 410 440 400 200 300 320 340 300 380 40O 420 440 460 200 300 320 340 160 300 400 420 440 460 



Total length (m) 



Figure 5 



Female Gulf St. Vincent length-frequency histograms expressed as proportion of fish caught per 5-mm length class. 

 Ages (by monthi illustrated were those of largest sample size. Black bars correspond to fish caught when the fishery 

 was subject to a 280-mm size limit, and gray bars for fish caught under a 300-mm size limit. The fitted normal likelihood 

 probability density cur\'es (Eq. 4i calculated for each size limit have been overlaid for comparison. 



samples were obtained in the ages (-30 months) at which 

 the faster fish are entering the legal-size stock. These 

 clumps of points lie well above the estimated mean length 

 at age. In the absence of the truncation method, the mean 

 curves would pass through these points. 



Only the Akamine-Richards model failed to converge 

 with the South Australian King George whiting data sets. 

 Because the Richards form of the model includes both the 

 exponent and its inverse in different places in the formula, 

 it is likely to result in a more numerically challenging 



