NOTE Franks et al Stomach contents of juvenile Rachycentron canadum 



377 



(Fig. 4); however, the difference between these means 

 was not statistically significant (ANOVA, df=5, P>0.05). 

 Comparison of the percent occurrence of principal 

 prey categories between the diets of two groups of 

 juvenile cobia based on length (group 1=236-338 mm 

 FL; group 2=340-440 mm FL, Fig. 5) showed that 

 the smaller juveniles fed primarily on crustaceans 

 and fish, whereas fish were the primary foods of 

 group 2. Crustaceans were found in 21 of 25 (84%) 



stomachs of fish in group 1 but in only 5 of 14 ( 36% ) 

 stomachs offish in group 2. This indicated a highly 

 significant (/ 2 =8. 469, df=l,P<0.05) difference in diet 

 and was directly related to the greater frequency 

 occurrence of shrimp (including shrimp remains) in 

 the diet of group- 1 fish. Fish were important prey 

 for both groups of juveniles (Fig. 5), and although 

 we encountered fish more frequently in the stomachs 

 of group-2 fish, fish occurrence between the two 



