Figure 1. --Length frequency by school. (1): Sample number 

 (2): Size of sannple (3): Sampling fraction 

 (4): Date of catch (5): Locality of catch 

 (6): Kinds of associates sighted with the fish. 



and it is hypothesized that they are length 

 groups which differ with respect to their early 

 life history. 



A point which requires attention here is 

 the fact that for both group A and group B the 

 locations at which the respective modes appear 



— ' The question of whether or not the two 

 are different age groups will be examined in a 

 subsequent report. 



differ slightly from one school to another. This 

 sort of discrepancy is thought to appear more 

 conspicuously in group A than in group B. 



Table 1 is a statistical examination of the 

 separate samples, for both group A and group 

 B, in order to see whether or not they were 

 after all homogeneous. For this examination 

 the determination of the size ranges of the two 

 groups was based on the size composition of all 

 measurements (fig. 2, panel b) and they were 

 taken to be 50. 1 - 68.0 cm. and 70. 1-86.0 

 cm. respectively. For each group only those 



38 



