FISHERY BULLETIN: VOL 76. NO. 4 



the von Bertalanffy in the case of males and 5% 

 larger for females. 



Table 3. — Residual sums of squares for six brown shrimp 

 growth models. 



The difference in growth between sexes and the 

 ability of the von Bertalanffy model to fit the ob- 

 servations is visible from plots of the observed 

 lengths about the growth models. Data points 

 were plotted by first calculating the age at release 

 from the fitted model, adding time at large to com- 

 pute the age at recapture, then plotting that age 

 and the recapture size. The plots (Figure lA, B) 

 show that sex specific growth does exist and that 

 the differences are of significant magnitude. 

 Further, the von Bertalanffy model does visibly fit 

 the observed data. Although the observed data do 



7 10 12 14 

 AGE (MONTHS) 



7 10 12 14 

 AGE (MONTHS) 



Figure L— Brown shrimp growth models. A) von Bertalanffy growth model, males; B) von Bertalanffy growth model, females; 



C) monomolecular model, males; D) monomolecular model, females. 



830 



